Bibliografie tematiche / High frequency probe tone

Indice

Articoli di riviste
Tesi
Libri
Capitoli di libri
Atti di convegni
Rapporti di organizzazioni

Letteratura scientifica selezionata sul tema "High frequency probe tone"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili

Scegli il tipo di fonte:

Consulta la lista di attuali articoli, libri, tesi, atti di convegni e altre fonti scientifiche attinenti al tema "High frequency probe tone".

Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.

Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.

Articoli di riviste sul tema "High frequency probe tone"

Nelson, David A., e Todd W. Fortune. "High-Level Psychophysical Tuning Curves". Journal of Speech, Language, and Hearing Research 34, n. 2 (aprile 1991): 360–73. http://dx.doi.org/10.1044/jshr.3402.360.

Testo completo

Abstract (sommario):

Simultaneous-masked psychophysical tuning curves were obtained from normal-hearing listeners using low-level (20–25 dB SPL) probe tones in quiet and high-level (60 dB SPL) probe tones, both in quiet and in the presence of a broad-band background noise. The background noise was introduced to eliminate combination tones or combination bands and other off-frequency listening cues that exist at high levels. Tuning curves were obtained using pure-tone maskers and 100-Hz-wide narrow-band noise maskers for probe tones at 1000 and 4000 Hz. High-level tuning curves for pure-tone maskers demonstrated large discontinuities or “notches” on the low-frequency sides of the tuning curves. Broad-band background noise eliminated those notches, indicating that the notches were due to the detection of off-frequency listening cues at combination-tone frequencies. High-level tuning curves for 100-Hz-wide narrow-band maskers also demonstrated notches on the low-frequency sides. Those notches were eliminated with broad-band background noise, which indicates that combination bands strongly influenced the shapes of high-level tuning curves obtained with narrow-band maskers. The influence of combination bands was dependent upon test frequency. At 1000 Hz, combination bands had very little influence on the shapes of high-level tuning curves. At 4000 Hz, where the masker bandwidth was substantially less than the critical bandwidth, combination bands strongly affected the low-frequency sides of the tuning curves. In 2 subjects tested at a probe frequency of 2000 Hz with 100-Hz-wide masking bands, combination bands also influenced the lowfrequency sides of high-level tuning curves. The presence of combination-tone or combination-band cues essentially steepened the low-frequency slopes of tuning curves, resulting in sharper estimates of tuning. Comparisons of tuning curves obtained with pure-tone maskers and narrow-band maskers, in the same listeners, revealed that pure-tone maskers were more effective than narrow-band maskers when the masker frequencies were in the tail region of the tuning curve. The results of these experiments support the notion that tuning in the normal auditory system broadens notably with stimulus level, once off-frequency listening cues such as combination tones or combination bands are eliminated. The low-level simultaneously masked tuning curve demonstrates a sharp bandpass tuning characteristic, whereas the high-level simultaneously masked tuning curve in background noise demonstrates a broad low-pass tuning characteristic. It is argued that comparisons of tuning in impaired ears with tuning in normal ears should be made using estimates of tuning in normal ears that are not influenced by combination-tone or combination-band detection cues.

Gli stili APA, Harvard, Vancouver, ISO e altri

Kordus, Monika, e Borys Kowalewski. "Effects of Low- and High-Frequency Side Bands of Notched Noise on Masking and Auditory Filter Shape at Very High Frequencies". Archives of Acoustics 40, n. 3 (1 settembre 2015): 329–36. http://dx.doi.org/10.1515/aoa-2015-0036.

Testo completo

Abstract (sommario):

Abstract This paper is concerned with the determination of the auditory filter shape using the notched noise method with noise bands symmetrically located above and below a probe frequency of 10 kHz. Unlike in the classical experiments conducted with the use of Patterson method the levels as well as power spectrum densities of the lower and upper component bands of the notched noise masker were not the same and were set such as to produce the same amount of masking at the 10-kHz frequency. The experiment consisted of three conditions in which the following values were determined: (I) the detection threshold for a 10-kHz probe tone in the presence of a noise masker presented below the tone’s frequency; (II) the level of a noise masker presented above the 10-kHz probe tone frequency, at which the masker just masked the probe tone, (III) the detection threshold for a probe tone in the presence of a notched-noise masker. The data show a considerable amount of variability across the subjects, however, the resulting frequency characteristics of the auditory filters are consistent with those presented in the literature so that the Equivalent Rectangular Bandwidth is less than 11% of their centre frequency.

Gli stili APA, Harvard, Vancouver, ISO e altri

Sprague, Barbara H., Terry L. Wiley e Robert Goldstein. "Tympanometric and Acoustic-Reflex Studies in Neonates". Journal of Speech, Language, and Hearing Research 28, n. 2 (giugno 1985): 265–72. http://dx.doi.org/10.1044/jshr.2802.265.

Testo completo

Abstract (sommario):

Tympanograms and acoustic reflexes for a broadband noise and for a 1000-Hz tone were measured in normal neonates. Notched tympanograms were typical of neonatal ears for a 220-Hz probe tone. A single-peaked tympanogram was most characteristic for a probe frequency of 660 Hz. Ipsilateral and contralateral acoustic reflexes were present more frequently for a 660-Hz probe tone compared to a 220-Hz probe tone, but acoustic-reflex thresholds were not significantly different between probe tones. As with adults, acoustic-reflex thresholds for the noise were significantly lower than for the tone, and ipsilateral reflex thresholds were lower than contralateral reflex thresholds. Reliability of acoustic-reflex and tympanometric measures was high. Age change from 2 to 4 days had no significant effect on tympanometric or acoustic-reflex characteristics. There was no apparent relation between tympanometric pattern and acoustic-reflex characteristics.

Gli stili APA, Harvard, Vancouver, ISO e altri

Ying-ying, Shang, Ni Dao-feng e Liu Shi-lin. "High- and Low-Frequency Probe Tone Tympanometry in Chinese Infants". Journal of Otology 2, n. 1 (giugno 2007): 42–51. http://dx.doi.org/10.1016/s1672-2930(07)50008-5.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Lutolf, John J., Honor O'Malley e Shlomo Silman. "The Effects of Probe-Tone Frequency on the Acoustic-Reflex Growth Function". Journal of the American Academy of Audiology 14, n. 02 (febbraio 2003): 109–18. http://dx.doi.org/10.3766/jaaa.14.2.6.

Testo completo

Abstract (sommario):

Acoustic-reflex growth functions (ARGFs) were obtained from 20 normal-hearing listeners, Contralateral acoustic reflexes (ARs) were elicited with pure tones of 2000 Hz. The magnitude of changes in static compliant susceptance (BA) and conductance (GA) were monitored with probe-tone frequencies of 226 Hz, 678 Hz and 1000 Hz. ARGFs were obtained with six combinations of probe-tone frequency/admittance component: 226 Hz BA, 226 Hz GA, 678 Hz BA, 678 Hz GA, 1000 Hz BA, and 1000 Hz GA. Peak conductance (GA) and susceptance (BA) ARs were largest within the 678 Hz GA and 1000 Hz BAARGFs, respectively. Among high-frequency probe tones, the patterns of AR growth were larger and less variable for the 678 Hz GA ARGF and the 1000 Hz BA ARGF as determined by the magnitude of their linear (b1) and quadratic (b2) polynomial coefficients and the value of their squared correlation coefficients (R2).

Gli stili APA, Harvard, Vancouver, ISO e altri

Sinex, D. G., e D. C. Havey. "Neural mechanisms of tone-on-tone masking: patterns of discharge rate and discharge synchrony related to rates of spontaneous discharge in the chinchilla auditory nerve". Journal of Neurophysiology 56, n. 6 (1 dicembre 1986): 1763–80. http://dx.doi.org/10.1152/jn.1986.56.6.1763.

Testo completo

Abstract (sommario):

Responses of chinchilla auditory nerve fibers to brief probe tones in the presence of a fixed tonal masker were obtained. The stimulus conditions were analogous to those that have been used in many psychophysical experiments. The relation between previously described response properties of auditory nerve fibers and features of psychophysical tone-on-tone masking was examined. In psychophysical studies, a fixed narrowband masker produces a characteristic pattern of masked thresholds, which becomes broad and asymmetrical at high masker levels. In the present experiment 1, a 5,000-Hz masker was presented at 30, 50, and 70 dB SPL. Masked thresholds based on the average rate of response to probe tones were estimated for single auditory nerve fibers. The lowest of these masked thresholds formed a pattern similar to the psychophysical masking pattern, becoming broader and more asymmetrical as the masker was increased to 70 dB SPL. The masked thresholds of fibers with low and medium rates of spontaneous discharge (SR) were as low as or lower than the masked thresholds of fibers with high SRs. In certain frequency regions, masked thresholds based on responses to cochlear distortion products were lower than the masked thresholds of any fiber responding to the probe tone; this result is also similar to previous psychophysical observations. In experiment 2, responses of chinchilla auditory nerve fibers to probe tones in the presence of a masker at 1,000 Hz and 50 dB SPL were studied. Probe tone thresholds in the presence of this masker have been measured psychophysically in chinchillas. Thus the relation between behavioral and neural masked thresholds in the same species could be examined. Masked thresholds were estimated from average discharge rate responses and also from discharge synchrony. Good quantitative agreement was observed between the probe tone levels at which changes in average discharge rate were observed and the chinchilla's behavioral masked thresholds. For fibers matched for characteristic frequency, the masked thresholds based on average discharge rate of high-SR fibers tended to be elevated compared with the thresholds of medium-SR fibers. Changes in discharge rate synchronized to the probe tone occurred at levels lower than the chinchilla's behavioral masked thresholds. If discharge synchrony can be used for detection, the code would appear to be based on the relative synchrony to the probe tone and to the masking tone. Low synchrony masked thresholds were obtained from fibers with all SRs.(ABSTRACT TRUNCATED AT 400 WORDS)

Gli stili APA, Harvard, Vancouver, ISO e altri

Abdala, Carolina, Ping Luo e Yeini Guardia. "Swept-Tone Stimulus-Frequency Otoacoustic Emissions in Human Newborns". Trends in Hearing 23 (gennaio 2019): 233121651988922. http://dx.doi.org/10.1177/2331216519889226.

Testo completo

Abstract (sommario):

Several types of otoacoustic emissions have been characterized in newborns to study the maturational status of the cochlea at birth and to develop effective tests of hearing. The stimulus-frequency otoacoustic emission (SFOAE), a reflection-type emission elicited with a single low-level pure tone, is the least studied of these emissions and has not been comprehensively characterized in human newborns. The SFOAE has been linked to cochlear tuning and is sensitive to disruptions in cochlear gain (i.e., hearing loss) in adult subjects. In this study, we characterize SFOAEs evoked with rapidly sweeping tones in human neonates and consider the implications of our findings for human cochlear maturation. SFOAEs were measured in 29 term newborns within 72 hr of birth using swept tones presented at 2 oct/s across a four-octave frequency range (0.5–8 kHz); 20 normal-hearing young adults served as a control group. The prevalence of SFOAEs in newborns was as high as 90% (depending on how response “presence” was defined). Evidence of probe-tip leakage and abnormal ear-canal energy reflectance was observed in those ears with absent or unmeasurable SFOAEs. Results in the group of newborns with present stimulus-frequency emissions indicate that neonatal swept-tone SFOAEs are adult-like in morphology but have slightly higher amplitude compared with adults and longer SFOAE group delays. The origin of these nonadult-like features is probably mixed, including contributions from both conductive (ear canal and middle ear) and cochlear immaturities.

Gli stili APA, Harvard, Vancouver, ISO e altri

Kei, Joseph, Julie Allison-Levick, Jacqueline Dockray, Rachel Harrys, Christina Kirkegard, Janet Wong, Marion Maurer, Jayne Hegarty, June Young e David Tudehope. "High-Frequency (1000 Hz) Tympanometry in Normal Neonates". Journal of the American Academy of Audiology 14, n. 01 (gennaio 2003): 020–28. http://dx.doi.org/10.3766/jaaa.14.1.4.

Testo completo

Abstract (sommario):

The characteristics of high frequency (1000 Hz) acoustic admittance results obtained from normal neonates were described in this study. Participants were 170 healthy neonates (96 boys and 74 girls) aged between 1 and 6 days (mean = 3.26 days, SD = 0.92). Transient evoked otoacoustic emissions (TEOAEs), and 226 Hz and 1000 Hz probe tone tympanograms were obtained from the participants using a Madsen Capella OAE/middle ear analyser. The results showed that of the 170 neonates, 34 were not successfully tested in both ears, 14 failed the TEOAE screen in one or both ears, and 122 (70 boys, 52 girls) passed the TEOAE screen in both ears and also maintained an acceptable probe seal during tympanometry. The 1000 Hz tympanometric data for the 122 neonates (244 ears) showed a single-peaked tympanogram in 225 ears (92.2 %), a flat-sloping tympanogram in 14 ears (5.7 %), a double-peaked tympanogram in 3 ears (1.2 %) and other unusual shapes in 2 ears (0.8 %). There was a significant ear effect, with right ears showing significantly higher mean peak compensated static admittance and tympanometric width, but lower mean acoustic admittance at +200 daPa and gradient than left ears. No significant gender effects or its interaction with ear were found. The normative tympanometric data derived from this cohort may serve as a guide for detecting middle ear dysfunction in neonates.

Gli stili APA, Harvard, Vancouver, ISO e altri

Gupta, Dipti, e C. S. Vanaja. "Effect of age on acoustic reflex thresholds in neonates and infants with normal hearing". International Journal of Otorhinolaryngology and Head and Neck Surgery 7, n. 5 (23 aprile 2021): 746. http://dx.doi.org/10.18203/issn.2454-5929.ijohns20211421.

Testo completo

Abstract (sommario):

Background: High frequency (1000 Hz) probe tone holds substantial promise for carrying out acoustic reflexes in neonates and infants. A limited number of studies indicates that acoustic reflex thresholds (ART) also change significantly with age as the newborn hearing system matures. However, there is a need for obtaining more data before using it in a clinical population. The aim was to investigate effect of age of infants on ARTs. Effect of activator signal was also explored. Methods: ARTs were monitored using a 1 kHz probe tone for the 500 Hz, 1 kHz, 2 kHz, and 4 kHz pure tone activators in neonates and infants in the age range of 6 to 8 weeks were analysed.Results: The mean ARTs for neonates were lower compared to infants. Results of repeated measure ANOVA showed that there was a statistically significant age effect. Also, ARTs for high frequency activator signals were significantly higher than the ARTs for low frequency signals.Conclusions: The acoustic reflexes can be elicited for 500, 1000, 2000, and 4000 Hz when monitored using a 1000 Hz probe tone. There is an effect of age and activator signal on the acoustic reflex threshold. The data obtained in the present study can serve as normative for 0-1-week neonates and 6-8-weeks infants.

Gli stili APA, Harvard, Vancouver, ISO e altri

Fernandez-Prieto, Irune, Charles Spence, Ferran Pons e Jordi Navarra. "Does Language Influence the Vertical Representation of Auditory Pitch and Loudness?" i-Perception 8, n. 3 (giugno 2017): 204166951771618. http://dx.doi.org/10.1177/2041669517716183.

Testo completo

Abstract (sommario):

Higher frequency and louder sounds are associated with higher positions whereas lower frequency and quieter sounds are associated with lower locations. In English, “high” and “low” are used to label pitch, loudness, and spatial verticality. By contrast, different words are preferentially used, in Catalan and Spanish, for pitch (high: “agut/agudo”; low: “greu/grave”) and for loudness/verticality (high: “alt/alto”; low: “baix/bajo”). Thus, English and Catalan/Spanish differ in the spatial connotations for pitch. To analyze the influence of language on these crossmodal associations, a task was conducted in which English and Spanish/Catalan speakers had to judge whether a tone was higher or lower (in pitch or loudness) than a reference tone. The response buttons were located at crossmodally congruent or incongruent positions with respect to the probe tone. Crossmodal correspondences were evidenced in both language groups. However, English speakers showed greater effects for pitch, suggesting an influence of linguistic background.

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Tesi sul tema "High frequency probe tone"

Silva, Kilza de Arruda Lyra e. "Achados timpanométricos em neonatos:medidas e interpretações". Pontifícia Universidade Católica de São Paulo, 2005. https://tede2.pucsp.br/handle/handle/11851.

Testo completo

Abstract (sommario):

Made available in DSpace on 2016-04-27T18:11:46Z (GMT). No. of bitstreams: 1 Dissertacao_KilzaArruda.pdf: 594058 bytes, checksum: a238824dfa6ae7f27d50010de62bd6ee (MD5) Previous issue date: 2005-08-23
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Introduction. Early identification and diagnosis of hearing impairment in newborns aim at establishing adequate amplification and intervention, as early as possible, in order to reduce negative consequences in language, individual and social development of the child. Tympanometry is part of a test battery for the diagnosis of hearing losses and is used to differentiate between conductive and sensorineural hearing losses. Before six months of age the results obtained using a probe tone of 226 Hz can be misleading. Therefore many studies have been done assessing the use of a high frequency probe tone of 678 and 1000 Hz aiming at a more valid procedure. Goal. The goal of the present study was to describe and discuss interpretations and measurements obtained in timpanometry of normal hearing neonates, using tone probes of 226, 678 and 1000 Hz. The following aspects were described: tympanometric curve type, Peak Compensated Static Acoustic Admittance (Ytm), Tympanometric Width (TW), Tympanometric Peak Pressure (PPT) and Equivalent Ear Canal Volume (Vea). Method. All subjects had normal otoacoustic emissions and no risk for hearing impairment. The curves were obtained in a quiet room using a middle ear analyzer GSI 33 II with tone probes of 226, 678 and 1000 Hz. All babies were calm or sleeping during the test. Results. 110 neonates were tested with the three tone probes therefore 660 curves were obtained. Age range was 6 to 30 days (58 boys and 52 girls). When a probe tone of 226 Hz was used, single peak curve was observed in 105 (47,7%) ears and double peak was found in 115 (52,3%) ears. Results with a probe tone of 678 Hz, revealed 56 (25,4%) single peak curves, 16 (7,3%) inverted curves (I) and 148 (67,3%) asymmetric (AS). Results with a probe tone of 1000 Hz showed 156 (70,9%) single peak tympanograms, 62 (28,2%) asymmetric and 2 (0,9%) inverted. Among the quantitative measurements analyzed, Vea demonstrated a significant difference in gender with probe tones of 226 Hz. Ytm, was also significantly different by gender with the probe tone of 1000 Hz, larger for the boys. For all the other variables no significant difference was found for ear or gender. When the curves were analyzed using the protocol proposed by Sutton et al (2002), 208 (94,5%) ears were considered normal and 12 (5,5%) abnormal with the probe tone of 678 Hz. For the probe tone of 1000 Hz, 217 (98,6%) ears were considered normal, and just 3 (1,4%) of the tympanograms were classified as abnormal. Conclusion. The tympanometric findings in this study were similar to those described in the literature with prevalence of single peaked curves for the probe tone of 1000 Hz and a similar number of single and double peaked curves with the probe tone of 226 Hz. The quantitative measurements were, in general, in agreement with the literature reviewed. The interpretation of the results with the probe tone of 1000 Hz using the protocol suggested by Sutton et al (2002) was the method that allowed the classification of normal for the greatest percentage of the ears tested suggesting that it can be very useful when neonates are evaluated. Further research with this protocol is suggested.
Introdução. A identificação e a caracterização precoce da perda auditiva em neonatos visam estabelecer condições para uma intervenção adequada, tão cedo quanto possível, a fim de reduzir as conseqüências negativas no desenvolvimento pessoal e social da criança. A timpanometria faz parte da bateria de testes do diagnóstico da perda auditiva e é utilizada para avaliação da orelha média, para diferenciar perdas condutivas de neurossensoriais. A timpanometria realizada em neonatos com menos de seis meses, quando executadas com tom sonda de baixa freqüência (226 Hz), pode gerar dúvidas, pois nesse tipo de sonda, neonatos com otite média podem revelar timpanograma aparentemente normal. Com isso, tem-se investigado o uso de tom sonda de alta freqüência (678 e 1000 Hz) em busca de resultados mais confiáveis. Objetivo. Descrever e analisar interpretações de características e medidas obtidas na timpanometria de neonatos ouvintes com sonda de tom prova de 226, 678 e 1000 Hz. São descritos os seguintes aspectos do timpanograma: características da curva timpanométrica, Admitância Acústica Estática de Pico Compensado na Altura da Membrana Timpânica (Ymt), Largura Timpanométrica (LT), Pressão do Pico Timpanométrico (PPT) e Volume Equivalente do Meato Acústico Externo (Vea). Metodologia. Os sujeitos analisados passaram por uma triagem que incluiu anamnese e teste de emissões otoacústicas. Para a realização das timpanometrias foi utilizado o analisador de orelha média GSI-33-II, com tons sonda de 226, 678 e 1000 Hz, em sala silenciosa e com a criança em estado tranqüilo. Resultados. Foram obtidos timpanogramas de 110 neonatos ouvintes com 6 a 30 dias de idade (58 meninos e 52 meninas), perfazendo um total de 660 timpanogramas. No tom sonda de 226 Hz, o tipo de curva pico único (A) apareceu em 105 (47,7%) orelhas e o tipo pico duplo (PD) em 115 (52,3%) orelhas. Os resultados na freqüência de 678 Hz indicaram 56 (25,5%) ocorrências de curva tipo A, 16 (7,3%) do tipo invertida (I) e 148 (67,3%) curvas do tipo assimétrica (AS). Na sonda de 1000 Hz foram registradas 156 (70,9%) curvas do tipo A, 62 (28,2%) do tipo AS e 2 (0,9%) do tipo I. Dentre as variáveis quantitativas analisadas, apenas o Vea apresentou efeito de significância por orelha na sonda de tom prova de 1000 Hz. O Vea apresentou efeito de significância em relação ao gênero nas freqüências de 226 e 1000 Hz. A Ymt, também, apresentou efeito de significância por gênero, na sonda de 1000 Hz, sendo maior nos meninos. Nas demais variáveis não foi encontrado efeito de significância nem por orelha e nem por gênero. Quando interpretados de acordo com o protocolo recomendado por Sutton et al (2002), obteve-se, em 678 Hz, 208 (94,5%) orelhas com resultado normal, enquanto 12 (5,5%) foram interpretadas como anormais. Na sonda de tom prova de 1000 Hz, 217 (98,6%) das orelhas foram normais, e apenas 3 (1,4%) dos timpanogramas foram classificados como anormais. Conclusão. Os achados timpanométricos, tanto em 226 Hz quanto em 1000 Hz, foram compatíveis com os resultados presentes na literatura, que descrevem alta ocorrência de curvas do tipo A em sonda de 1000 Hz e equilíbrio entre os tipos de curva A e PD em sonda de 226 Hz. Os dados registrados para as medidas quantitativas, também, estiveram de acordo com o indicado na literatura. A interpretação das curvas timpanométricas com sonda de 1000 Hz utilizando o protocolo proposto por Sutton et al (2002) foi a que possibilitou a classificação de normal na maior porcentagem das orelhas avaliadas, sugerindo que este pode ser um método de grande utilidade na avaliação de bebês. Recomenda-se que pesquisas futuras com esse protocolo sejam realizadas.

Gli stili APA, Harvard, Vancouver, ISO e altri

Gredmaier, Ludwig Konrad. "The effect of probe tone duration on psychoacoustic frequency selectivity". Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396142.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Lavoie, Kimberly J. "High Frequency Pure Tone Audiometry and High Frequency Distortion Product Otoacoustic Emissions: A Correlational Analysis". PDXScholar, 2003. https://pdxscholar.library.pdx.edu/open_access_etds/1688.

Testo completo

Abstract (sommario):

Previous studies show that pure tone thresholds are strongly correlated with distortion product otoacoustic emission amplitudes when evaluating the frequency range from 1 to 8 kHz (Avan & Bonfils, 1993). Little is known about correlations between these two measures at higher frequencies from 9-16 kHz. This study compared pure tone thresholds and distortion product otoacoustic emissions (DPOAEs) in this high frequency range for 29 normal hearing subjects ages 18-30. Pure tone thresholds were obtained at 250-16 kHz and distortion product otoacoustic emissions (DPOAE) 2,211-17,675 were measured in the same ears. DPOAE amplitudes were measured using a constant F1/F2 ratio of 1.2, with F2 values ranging from 2,211-17,675 Hz. Data obtained from 50 ears showed a decline in DPOAE amplitude with increasing frequency of the F1 and F2 primary stimulus tones. Behavioral thresholds demonstrated an increase with increasing frequency of the pure tone stimulus. Pearson r-correlation analysis demonstrated a weak relationship between measures. Further investigation revealed that equipment variables prevented accurate readings.

Gli stili APA, Harvard, Vancouver, ISO e altri

Lepidis, Polichronis. "High resolution frequency analysis in scanning probe microscopy". [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=96834674X.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Meier, David Alan. "The Design and Evaluation of a High Frequency Fore-Aft Probe". Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/35650.

Testo completo

Abstract (sommario):

A high-frequency surge and stall sensing fore-aft probe was developed at the Turbomachinery Research Laboratory at Virginia Tech. The probe was designed to detect surge and stall based on changes in large regions of flow behind a turbofan engine compressor fan. The probe exhibited excellent frequency response capabilities and can accurately measure data with response well above anticipated surge frequencies. A CFD analysis was performed in order to gain more understanding about the flow around the probe. The results of the CFD analysis and the experimental testing were analyzed and presented. The probe worked as expected when the flow was aligned with the upstream pressure transducer. Thus, it can be used to determine the onset of surge and stall. However, the probe was found to be extremely sensitive to off-axis flows. Design improvements are suggested in order to increase its capabilities.
Master of Science

Gli stili APA, Harvard, Vancouver, ISO e altri

Salomon, Michael. "Properties of Gravity Probe B gyroscopes obtained from high frequency SQUID signal /". May be available electronically:, 2008. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Popernack, Thomas G. Jr. "Development of a data reduction method for a high frequency angle probe". Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45881.

Testo completo

Abstract (sommario):

A data reduction method has been developed and tested for a high frequency angle probe. The angle probe is designed for unsteady aerodynamic measurements in transonic cryogenic wind tunnels. The probe measures time-resolved total pressure, static pressure, angle of attack, and yaw angle from readings of four pressure transducers. The unique feature of this probe, as compared to a conventional multi-hole directional probe, is that the four high frequency response silicon pressure transducers are mounted flush on the probe tip. The data reduction method is basically an interpolation routine of calibration curves. The calibration curves consist of experimentally determined non-dimensional flow coefficients.

Two experiments were conducted to test the probe and the data reduction method. The first experiment tested the angle probe in a Karman vortex street shed from a cylinder. In the second experiment, the angle probe was placed in an open air jet with an exit Mach number of 0.42. Plots of the time-resolved measurements and the Fast Fourier Transform analysis were made for each test.
Master of Science

Gli stili APA, Harvard, Vancouver, ISO e altri

Murnane, Owen D., J. K. Kelly, B. Prieve e Owen D. Murnane. "Tone-Burst-Evoked Otoacoustic Emissions and the Influence of High Frequency Hearing Loss in Humans". Digital Commons @ East Tennessee State University, 2000. https://dc.etsu.edu/etsu-works/1921.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Haji, Amyn. "The utilisation of high frequency mini probe colonoscopic ultrasound in the assessment of colorectal disease". Thesis, King's College London (University of London), 2012. https://kclpure.kcl.ac.uk/portal/en/theses/the-utilisation-of-high-frequency-mini-probe-colonoscopic-ultrasound-in-the-assessment-of-colorectal-disease(6d7ecbfc-421e-4cae-afad-5e3cf8906ce0).html.

Testo completo

Abstract (sommario):

This research looks at the feasibility of colonoscopic high frequency ultrasound in the colon using mini probe technology. The objectives are across four different areas with assessment of colonic cancer, malignant colorectal polyps, rectal polyps and diverticular disease. High frequency 12 and 20 MHz ultrasound were used to locally stage colonic cancer and compare this to conventional CT in patients undergoing elective colonic resection. In addition, depth of infiltration of rectal polyps was determined by 20 MHz ultrasound and these findings compared with MRI in patients undergoing TEMS procedure. Malignant colorectal polyps were assessed after endoscopic removal to assess for the presence of residual or recurrent disease in the colonic wall and also to stage the local lymph nodes. Finally, the thickness of colonic wall in patients with diverticular disease was measured using 20 MHz ultrasound and this was compared with normal controls. The research has clearly shown that colonoscopic high frequency mini probe ultrasound is feasible in the colon with reproducible results. Overall, 12 and 20 MHz colonoscopic ultrasound are superior to CT for local staging of colonic cancer. 20 MHz ultrasound offers greater accuracy for assessment of depth of infiltration of rectal polyps compared with MRI. This probe may also be utilised to assess the colonic wall for residual disease in the polypectomy scar of malignant polyps but larger numbers are needed with longer follow up in order to draw firm conclusions. Finally, it was feasible to measure the thickness of colonic wall in patients with diverticular disease and this was greater than that seen in normal patients. In conclusion, this research has been promising in that colonoscopic high frequency mini probe ultrasound is feasible in the colon and can be used to assess colorectal polyps and cancer and diverticular disease. In order to draw firm conclusions, this pilot research needs to be taken further with larger scale studies.

Gli stili APA, Harvard, Vancouver, ISO e altri

Boone, Justin. "Through Wafer 3D Vertical Micro-Coaxial Probe for High Frequency Material Characterization and Millimeter Wave Packaging Systems". FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/897.

Testo completo

Abstract (sommario):

This work presents the development of an in-plane vertical micro-coaxial probe using bulk micromachining technique for high frequency material characterization. The coaxial probe was fabricated in a silicon substrate by standard photolithography and a deep reactive ion etching (DRIE) technique. The through-hole structure in the form of a coaxial probe was etched and metalized with a diluted silver paste. A co-planar waveguide configuration was integrated with the design to characterize the probe. The electrical and RF characteristics of the coaxial probe were determined by simulating the probe design in Ansoft’s High Frequency Structure Simulator (HFSS). The reflection coefficient and transducer gain performance of the probe was measured up to 65 GHz using a vector network analyzer (VNA). The probe demonstrated excellent results over a wide frequency band, indicating its ability to integrate with millimeter wave packaging systems as well as characterize unknown materials at high frequencies. The probe was then placed in contact with 3 materials where their unknown permittivities were determined. To accomplish this, the coaxial probe was placed in contact with the material under test and electromagnetic waves were directed to the surface using the VNA, where its reflection coefficient was then determined over a wide frequency band from dc-to -65GHz. Next, the permittivity of each material was deduced from its measured reflection coefficients using a cross ratio invariance coding technique. The permittivity results obtained when measuring the reflection coefficient data were compared to simulated permittivity results and agreed well. These results validate the use of the micro-coaxial probe to characterize the permittivity of unknown materials at high frequencies up to 65GHz.

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Libri sul tema "High frequency probe tone"

Gray, Pamela S. The effects of rise-time and frequency on the auditory brainstem response using high-frequency tone-bursts. 1987.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Gray, Pamela S. The effects of rise-time and frequency on the auditory brainstem response using high-frequency tone-bursts. 1987.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Turim, Maureen, e Michael Walsh. Sound Events. A cura di John Richardson, Claudia Gorbman e Carol Vernallis. Oxford University Press, 2013. http://dx.doi.org/10.1093/oxfordhb/9780199733866.013.0026.

Testo completo

Abstract (sommario):

This article appears in theOxford Handbook of New Audiovisual Aestheticsedited by John Richardson, Claudia Gorbman, and Carol Vernallis. This chapter is a comprehensive survey of sound practices in avant-garde film, video art, and installation art since the 1960s. It addresses a series of artistic approaches to sound: silence, tone and drone, antic and aleatory, multilayering and cacophony, work with voices, legacies of cinematic exhibition, and resonant spaces in galleries and museums. It is broadly chronological, beginning with major figures of the 1960s and ending with artists currently working. The chapter does not deny medium specificity, but moves easily among celluloid film, video formats, and gallery installation. Theoretical perspectives derive from the debate between Deleuze and Badiou on the nature and frequency of “the event,” a restaging of the discussion on the value of experiment and innovation. The chapter is wide-ranging enough to be synoptic, but also provides detailed discussion of works by Larry Gottheim, Abigail Child, Andy Warhol, Christian Marclay, Janet Cardiff, and Bruce High Quality Foundation.

Gli stili APA, Harvard, Vancouver, ISO e altri

Capitoli di libri sul tema "High frequency probe tone"

Paulson, C. A., e D. W. Van Der Weide. "Near-Field High-Frequency Probing". In Scanning Probe Microscopy, 315–45. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-28668-6_11.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Kawakatsu, Hideki. "High-Frequency Dynamic Force Microscopy". In Applied Scanning Probe Methods V, 99–112. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-37316-2_5.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Rutten, W. L. C., e V. F. Prijs. "Compound Action Potential (AP) Tuning in Man and Guinea Pig: Effect of Probe Tone Level and Hearing Loss". In Auditory Frequency Selectivity, 161–70. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2247-4_19.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Kakemoto, Hirofumi, Song Min Nam, Satoshi Wada e Takaaki Tsurumi. "High Frequency Dielectric Mapping Using Un-Contact Probe for Dielectric Materials". In Electroceramics in Japan IX, 189–92. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-411-1.189.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Angelsen, B. A. J., J. Hoem, S. Dørum, J. Chapman, E. Grube, U. Gerckens, C. A. Visser e J. Vandenbogaerde. "High-Frequency Annular Array Transesophageal Probe for High-Resolution Imaging and Continuous Wave Doppler Measurements". In Transesophageal Echocardiography, 13–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74257-6_2.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Polli, D., D. Brida, G. Lanzani e G. Cerullo. "Observation of High-Frequency Coherent Vibrational Motion with Strongly Chirped Probe Pulses". In Springer Series in Chemical Physics, 337–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-95946-5_109.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Ravez, M., M. Ourak, M. Ouaftouh, W. J. Xu e B. Nongaillard. "An Active Load Backing Transducer for High Frequency Ultrasonic Probe: Imaging Systems Applications". In Acoustical Imaging, 345–51. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2958-3_47.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Rout, Anil Kumar, Santosh Kumar Hotta, Niranjan Sahoo, Pankaj Kalita e Vinayak Kulkarni. "Coaxial Thermal Probe for High-Frequency Periodic Response in an IC Engine Test Rig". In Proceedings of the 7th International Conference on Advances in Energy Research, 805–13. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5955-6_76.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Kakemoto, Hirofumi, Jianyong Li, Takakiyo Harigai, Song Min Nam, Satoshi Wada e Takaaki Tsurumi. "High Frequency Dielectric Permittivity Measurement of Dielectric Layer of MLCC Using Non-Contact Probe". In Electroceramics in Japan X, 243–46. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-449-9.243.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Ippoliti, Carla, Susanna Tora, Carla Giansante, Romolo Salini, Federico Filipponi, Emanuela Scamosci, Massimo Petrini, Nicola Di Deo e Annamaria Conte. "Sentinel-2 e campionamenti in situ per il monitoraggio delle acque marine dell’Abruzzo: primi risultati". In Proceedings e report, 557–68. Florence: Firenze University Press, 2020. http://dx.doi.org/10.36253/978-88-5518-147-1.56.

Testo completo

Abstract (sommario):

In this study, the estimate of chlorophyll "a" and the dispersion of sediment in the sea, calculated from Sentinel-2, was compared with real data acquired in situ by a multiparametric probe, along the Abruzzo coast. The ultimate goal is to optimize parameters and algorithms to be able to derive concentration maps of chlorophyll and suspended solids from satellite, taking advantage of the high time frequency and high spatial resolution of the detections. This information is of particular relevance for aquaculture activities, for monitoring water quality and for analyzing sedimentary processes.

Gli stili APA, Harvard, Vancouver, ISO e altri

Atti di convegni sul tema "High frequency probe tone"

D'Amico, D., M. Scarselli, V. Foglietti, P. Chiaradia, P. Lugli e C. Di Natale. "HIGH FREQUENCY KELVIN PROBE INSTRUMENTATION". In Proceedings of the 7th Italian Conference. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812776457_0011.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Bomse, David. "High-Frequency Two-Tone FM Absorption Spectroscopy". In 27th AIAA Aerodynamic Measurement Technology and Ground Testing Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-4909.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Siegel, Jonathan H., e Karolina K. Charaziak. "High-frequency tone-pip-evoked otoacoustic emissions in chinchillas". In MECHANICS OF HEARING: PROTEIN TO PERCEPTION: Proceedings of the 12th International Workshop on the Mechanics of Hearing. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4939400.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Jacob, M. E., D. A. Miller e L. Forbes. "Ultra low capacitance high frequency IC probe". In NanoScience + Engineering, a cura di Michael T. Postek e John A. Allgair. SPIE, 2008. http://dx.doi.org/10.1117/12.792137.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Yanagida, Tomonori, Shohei Shibuya, Haruo Kobayashi e Kazumi Hatayama. "High-frequency low-distortion one-tone and two-tone signal generation using arbitrary waveform generator". In 2016 13th IEEE International Conference on Solid-State and Integrated Circuit Technology (ICSICT). IEEE, 2016. http://dx.doi.org/10.1109/icsict.2016.7999029.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Johnson, R. W. "Error correction coding for serial-tone HF transmission". In 7th International Conference on High Frequency Radio Systems and Techniques. IEE, 1997. http://dx.doi.org/10.1049/cp:19970765.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Chambon, Hugo, Pascal Nicolay, Thomas Moldaschl, Markus Zauner, Claude Humbert, Aoun AminAwan, Maximilian Schiek, Thomas Metzger e Ayech Benjeddou. "High Frequency Optical Probe for BAW/SAW Devices". In 2018 IEEE International Ultrasonics Symposium (IUS). IEEE, 2018. http://dx.doi.org/10.1109/ultsym.2018.8580056.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Tang, Zhi-Yong, Tian-Hao Song, Li Ding e Xing-Chang Wei. "A High Frequency Probe with End Launch Structure". In 2020 9th Asia-Pacific Conference on Antennas and Propagation (APCAP). IEEE, 2020. http://dx.doi.org/10.1109/apcap50217.2020.9245958.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Morris, S. P. "Coded-modulation enhancements to an HF single-tone modem". In 7th International Conference on High Frequency Radio Systems and Techniques. IEE, 1997. http://dx.doi.org/10.1049/cp:19970766.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Ha, Kyoung Ku, Tae Bin Jeong e Shin Hyoung Kang. "Experimental Study on Aero-Acoustic Characteristics of a Centrifugal Compressor and an Optimal Design for Noise Reduction". In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72421.

Testo completo

Abstract (sommario):

A centrifugal compressor for fuel-cell vehicles, which makes compressed air and sends it to the fuel-cell stack, is investigated in this paper. It is the only part of revolution in the system, and it consumes most of the system power. Therefore, it is important to achieve low noise level as well as high efficiency. The operating line of this compressor is determined along the highest efficiency points and during the design-point operation the blade tone noise is the main contributor. It is widely known that the blade passing frequency (BPF) noise components is due to the circumferential flow fluctuations of the impeller. So the noise spectrum of this compressor needs to be examined closely. So, an experimental study is designed to investigate the aero-acoustic characteristics of a centrifugal compressor in detail. The existing system is modified to allow pressure measurements at the inlet and outlet of the impeller. Four microphone probes are also installed to determine the noise level in an isolated room. Tests are carried out to investigate the phenomena governing the tonal noise and the dominant noise source of the centrifugal compressor. With such information on noise, a design optimization process is carried out to determine a superior design point which will guarantee good performance and low noise level at the design point. The optimization is performed using the surrogate management framework with the simulated results obtained at sampled points. The final optimal design point and the comparison between the optimal designed compressor and the existing centrifugal compressor are described in the last section of this paper.

Gli stili APA, Harvard, Vancouver, ISO e altri

Rapporti di organizzazioni sul tema "High frequency probe tone"

Lavoie, Kimberly. High Frequency Pure Tone Audiometry and High Frequency Distortion Product Otoacoustic Emissions: A Correlational Analysis. Portland State University Library, gennaio 2000. http://dx.doi.org/10.15760/etd.1688.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Hart, Carl R., e Gregory W. Lyons. A Measurement System for the Study of Nonlinear Propagation Through Arrays of Scatterers. Engineer Research and Development Center (U.S.), novembre 2020. http://dx.doi.org/10.21079/11681/38621.

Testo completo

Abstract (sommario):

Various experimental challenges exist in measuring the spatial and temporal field of a nonlinear acoustic pulse propagating through an array of scatterers. Probe interference and undesirable high-frequency response plague typical approaches with acoustic microphones, which are also limited to resolving the pressure field at a single position. Measurements made with optical methods do not have such drawbacks, and schlieren measurements are particularly well suited to measuring both the spatial and temporal evolution of nonlinear pulse propagation in an array of scatterers. Herein, a measurement system is described based on a z-type schlieren setup, which is suitable for measuring axisymmetric phenomena and visualizing weak shock propagation. In order to reduce directivity and initiate nearly spherically-symmetric propagation, laser induced breakdown serves as the source for the nonlinear pulse. A key component of the schlieren system is a standard schliere, which allows quantitative schlieren measurements to be performed. Sizing of the standard schliere is aided by generating estimates of the expected light refraction from the nonlinear pulse, by way of the forward Abel transform. Finally, considerations for experimental sequencing, image capture, and a reconfigurable rod array designed to minimize spurious wave interactions are specified. 15.

Gli stili APA, Harvard, Vancouver, ISO e altri

Offriamo sconti su tutti i piani premium per gli autori le cui opere sono incluse in raccolte letterarie tematiche. Contattaci per ottenere un codice promozionale unico!