Academic literature on the topic 'Headphone ANC'

A study was designed to assess the effect of headphone music on running performance and enjoyment with its implications for increasing exercise compliance. A counterbalanced split-plot design was used with 18 University of the Pacific undergraduates receiving both treatment conditions: running with music and running without music. Measures included: (a) perceived enjoyment questionnaire scores; (b) running time; and (c) heart rate. It was expected that music would increase participants' rated running enjoyment, amount of time spent running, and also running intensity or heart rate, in comparison to running without music. Music significantly increased participants' rated enjoyment scores but not running time or heart rate. A tendency for participants to run longer when they rated the run as more enjoyable was also observed although the obtained Pearson r was not significant at the p = .05 level.

The development of wireless headphones has put us in a new situation, both considering the product itself and how it is used. Headphones are today used everywhere, by everyone and are more and more ‘always on’.  Studies have looked at how we as humans get affected by music and how it affects both our personal space and focus on our surroundings. However, little has been studied on how the design of the headphone influences behaviours of the user and how the people interacting with the user is affected. The goal of this project is to strengthen the existing studies with research with a stronger focus on the social interactions between people while wearing headphones, and how design can influence these behaviours. A human-centred approach was used, implementing qualitative and quantitative analyses together with trigger materials that explores design alternatives.  The research findings showed that true wireless headphones have changed users’ behaviour both in usage and when encountering social interactions. It is a common understanding that it is rude to keep the headphones on while interacting with someone but the way the headphones are designed today there is not enough incentive for everyone to take them off. The major problem for the secondary user is the uncertainty if the counterpart hears them properly or not.  Two final products were created as two separate examples of how the findings can be implemented. To prevent antisocial behaviour, one of the products is designed to be left in the ear, but that communicates with the surrounding that the user is open for conversation using a light source. The other product facilitates the act of removing the headphones temporarily, by providing simple and accessible storage of the headphones that can be placed on the user’s garments.<br>I takt med att utvecklingen av trådlösa hörlurar har eskalerat har även vår relation till hörlurar förändrats, både vad det gäller produkten i sig, men också hur produkten används. Idag används hörlurar i stort sett överallt i vår omgivning. Det blir mer och mer en produkt som användaren konstant aktivt bär på sig, så kallat “always on”.  Studier har gjorts om hur människan påverkas av musik och hörlursanvändning, men få studier har gjorts där man undersöker hur dess design påverkar användarens beteende och personer i användarens omgivning.  Målet med detta projekt är att styrka befintliga studier med undersökningar som har större fokus på beteenden kring sociala interaktioner människor emellan, och hur design kan användas som en parameter för att påverka och förändra dessa beteenden. Projektet har utgått från ett användarcentrerat perspektiv där kvalitativa och kvantitativa analyser implementerats och kompletterats med triggermaterial vars syfte har varit att utforska alternativ design och undersöka användarnas reaktioner på dessa.  Studien visade att trådlösa hörlurar har förändrat användares beteende, både vad gäller användande av produkten, men också gällande sociala interaktioner. Det finns en allmän uppfattning om att det anses otrevligt att inte ta av sig sina hörlurar vid sociala interaktioner men som dagens trådlösa hörlurar är designade är det inte ett tillräckligt stort incitament för alla att faktiskt ska ta av sig dem. Det här skapar problem hos personerna i användarens omgivning, då det är svårt att avgöra om användaren lyssnar aktivt på dem eller inte. Två slutgilitga produkter togs fram som två separata exempel på hur insikterna från studien kan användas och implementeras. För att undvika asociala beteenden är en av produkterna designad för att kunna lämnas kvar i örat, men kommunicera tillgänglighet till omgivningen genom en ljuskombination på hörluren. Den andra produkten förenklar förvaringen av hörlurar genom att fodralet till hörlurarna kan fästas på användarens kläder, och på så sätt göra det lättare att ta ut hörlurarna ur öronen under sociala interaktioner.

Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.<br>Includes bibliographical references (p. 97).<br>A Discrete Time Signal Processor for use on the audio path in the Bose QuietComfort® Acoustic Noise Cancelling® [5] Headphones was designed and implemented. The purpose was to demonstrate that digital processing was feasible for this type of portable consumer product, and to design and add new equalization and adaptive abilities not currently available in the all analog circuitry. The algorithm was first prototyped in Simulink® and Real-Time Workshop®¹; it was then adapted to embedded code for an ADI Blackfin® ADSP-BF533 DSP.<br>by Nathan Fox Hanagami.<br>M.Eng.

In this thesis, the design and implementation of a Portable Feedback Active Noise Controller Headphone System, which is based on Texas Instruments TMS320VC5416PGE120 Fixed Point DSP, is described. Problems resulted from fixed-point implementation of LMS algorithm and delays existing in digital ANC implementation are determined. Effective solutions to overcome the aforementioned problems are proposed based on the literature survey. Design of the DSP based control card is explained and crucial points about analog-digital-mixed board design for noise sensitive applications are explained. Filtered input LMS algorithm, filtered input normalized LMS algorithm and filtered input sign-sign LMS algorithm are implemented as adaptation algorithms. The advantages and disadvantages of using modified LMS algorithms are indicated. The selection of the parameters of these algorithms is based on theoretical results and experiments. The real time performances of different adaptation algorithms are compared with each other as well as with a commercial analog ANC headphone under different types of artificial and natural noise signals. Moreover, practical conditions such as put on - put off case and dynamic range overflow case are handled with additional software implementations. It is shown that adaptive ANC systems improve the noise reduction significantly when the noise is within a narrow frequency range and this reduction can be applied to a wider frequency range. It is also shown that the problems of digitally implemented adaptive filters which are based on tracking capability, stability, dynamic range and portability can be fixed to challenge with the analog commercial ANC systems.