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Journal articles on the topic 'Codec AMR-WB+'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Li, Feng Lian, Xue Ying Zhang, and Xiao Lin Du. "Real-Time Implementation AMR-WB Algorithm in TMS320VC5509A DSP." Advanced Materials Research 490-495 (March 2012): 519–23. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.519.

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Adaptive multi-rate wideband (AMR-WB) speech codec is the first standard for both wired and wireless universal broadband speech codec. Real-time implementation of AMR-WB algorithm in DSP has important practical significance and will accelerate its course of practice. The paper first designed the hardware platform and system software structure for real-time implementation of the AMR-WB algorithm, then introduced the transplantation of AMR-WB algorithm to the designed hardware system. The paper next discussed the real-time implementation of optimized algorithm on the hardware platform. Objective test results indicated the decoded speeches of real-time platform were bit exactly the same as test sequences. Synthetic speeches of real-time platform were very good in restoring the speaker’s voice characteristics by good intelligibility and naturalness.

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2

Bessette, B., R. Salami, R. Lefebvre, et al. "The adaptive multirate wideband speech codec (AMR-WB)." IEEE Transactions on Speech and Audio Processing 10, no. 8 (2002): 620–36. http://dx.doi.org/10.1109/tsa.2002.804299.

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3

Zhang, Chun Ling, Sheng Hui Zhao, Hong Yuan Xiao, Jing Wang, and Jing Ming Kuang. "An Improved Method for AMR-WB Speech Codec." Advanced Materials Research 756-759 (September 2013): 1259–63. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.1259.

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an improved method is proposed to skip the look-ahead period in this paper. The improved method uses the autocorrelation algorithm to calculate the Linear Prediction (LP) coefficients and then the LP coefficients are employed to extrapolate new samples for replacing the look-ahead samples. To evaluate the quality of this method, perceptual evaluation of speech quality (PESQ) and the A/B listening test method are designed for the objective evaluation and subjective evaluation. The reconstructed quality of the modified method is near to the original AMR codec, at the same time, the delay of the improved method is lower 5ms than the original method.

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4

Xiang, Kai, Shihong Chen, and Yuanyuan Zeng. "Improved Frame Error Concealment Algorithm Based on Transform- Domain Mobile Audio Codec." Open Electrical & Electronic Engineering Journal 8, no. 1 (2014): 527–35. http://dx.doi.org/10.2174/1874129001408010527.

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In this paper, we propose an improved frame error concealment algorithm for TCX-based audio coders in order to improve the quality of decoded audio at the receiver. Conventional TCX-based frame error concealment algorithms in the AMR-WB+ audio codec are usually unable to adaptively adjust gain control according to changes in the magnitude of the correct frame before lost frames. Thus, we propose a new gain control approach based on stability of LPC filter, and the stream data need to contain the line spectrum frequency data and utilize different continuous attenuation factor formula based on different categories of lost frames. The proposed frame error concealment algorithm is designed for TCX-based audio codec. We make the performance comparison between the proposed method and the original algorithm currently employed in AMR-WB+ audio codec through the objective evaluation test and subjective evaluation test. The results prove that our algorithm can achieve better audio recovery quality than original frame error concealment algorithm employed in AMR-WB+ speech codec.

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5

Yeh, Cheng-Yu, and Hung-Hsun Huang. "An Upgraded Version of the Binary Search Space-Structured VQ Search Algorithm for AMR-WB Codec." Symmetry 11, no. 2 (2019): 283. http://dx.doi.org/10.3390/sym11020283.

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Adaptive multi-rate wideband (AMR-WB) speech codecs have been widely used for high speech quality in modern mobile communication systems, e.g., handheld mobile devices. Nevertheless, a major handicap is that a remarkable computational load is required in the vector quantization (VQ) of immittance spectral frequency (ISF) coefficients of an AMR-WB coding. In view of this, a two-stage search algorithm is presented in this paper as an efficient way to reduce the computational complexity of ISF quantization in AMR-WB coding. At stage 1, an input vector is assigned to a search subspace in an efficient manner using the binary search space-structured VQ (BSS-VQ) algorithm, and a codebook search is performed over the subspace at stage 2 using the iterative triangular inequality elimination (ITIE) approach. Through the use of the codeword rejection mechanisms equipped in both stages, the computational load can be remarkably reduced. As compared with the original version of the BSS-VQ algorithm, the upgraded version provides a computational load reduction of up to 51%. Furthermore, this work is expected to satisfy the energy saving requirement when implemented on an AMR-WB codec of mobile devices.

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6

Boumaraf, Messaouda, and Fatiha Merazka. "Secure Speech Transmission Using Chaos Encryption System for AMR-WB Codec." International Journal of Chaotic Computing 5, no. 1 (2017): 118–26. http://dx.doi.org/10.20533/ijcc.2046.3359.2017.0015.

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7

Byun, Kyung Jin, Ik Soo Eo, Hee Bum Jeong, and Minsoo Hahn. "An Embedded ACELP Speech Coding Based on the AMR-WB Codec." ETRI Journal 27, no. 2 (2005): 231–34. http://dx.doi.org/10.4218/etrij.05.0204.0067.

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8

He, Junhui, Junxi Chen, Shichang Xiao, Xiaoyu Huang, and Shaohua Tang. "A Novel AMR-WB Speech Steganography Based on Diameter-Neighbor Codebook Partition." Security and Communication Networks 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/7080673.

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Steganography is a means of covert communication without revealing the occurrence and the real purpose of communication. The adaptive multirate wideband (AMR-WB) is a widely adapted format in mobile handsets and is also the recommended speech codec for VoLTE. In this paper, a novel AMR-WB speech steganography is proposed based on diameter-neighbor codebook partition algorithm. Different embedding capacity may be achieved by adjusting the iterative parameters during codebook division. The experimental results prove that the presented AMR-WB steganography may provide higher and flexible embedding capacity without inducing perceptible distortion compared with the state-of-the-art methods. With 48 iterations of cluster merging, twice the embedding capacity of complementary-neighbor-vertices-based embedding method may be obtained with a decrease of only around 2% in speech quality and much the same undetectability. Moreover, both the quality of stego speech and the security regarding statistical steganalysis are better than the recent speech steganography based on neighbor-index-division codebook partition.

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9

Yeh, Cheng-Yu. "An efficient search algorithm for ISF vector quantization in AMR-WB speech codec." IEEJ Transactions on Electrical and Electronic Engineering 11, no. 6 (2016): 829–31. http://dx.doi.org/10.1002/tee.22310.

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10

Yao, Bing-Jhih, Cheng-Yu Yeh, and Shaw-Hwa Hwang. "A Search Complexity Improvement of Vector Quantization to Immittance Spectral Frequency Coefficients in AMR-WB Speech Codec." Symmetry 8, no. 10 (2016): 104. http://dx.doi.org/10.3390/sym8100104.

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11

Ahmad, Anwar. "An Investigation into the Performance Enhancement and Salient Features of AMR-WB Speech Codec Used in GSM Communication." IOSR Journal of Electronics and Communication Engineering 3, no. 3 (2012): 38–40. http://dx.doi.org/10.9790/2834-0333840.

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12

Jordane da Silva, Marielle, Dick Carrillo Melgarejo, Renata Lopes Rosa, and Demóstenes Zegarra Rodríguez. "Speech Quality Classifier Model based on DBN that Considers Atmospheric Phenomena." Journal of communications software and systems 16, no. 1 (2020): 75–84. http://dx.doi.org/10.24138/jcomss.v16i1.1033.

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Current implementations of 5G networks consider higher frequency range of operation than previous telecommunication networks, and it is possible to offer higher data rates for different applications. On the other hand, atmospheric phenomena could have a more negative impact on the transmission quality. Thus, the study of the transmitted signal quality at high frequencies is relevant to guaranty the user ́s quality of experience. In this research, the recommendations ITU-R P.838-3 and ITU-R P.676-11 are implemented in a network scenario, which are methodologies to estimate the signal degradations originated by rainfall and atmospheric gases, respectively. Thus, speech signals are encoded by the AMR-WB codec, transmitted and the perceptual speech quality is evaluated using the algorithm described in ITU-T Rec. P.863, mostly known as POLQA. The novelty of this work is to propose a non-intrusive speech quality classifier that considers atmospheric phenomena. This classifier is based on Deep Belief Networks (DBN) that uses Support Vector Machine (SVM) with radial basis function kernel (RBF-SVM) as classifier, to identify five predefined speech quality classes. Experimental Results show that the proposed speech quality classifier reached an accuracy between 92% and 95% for each quality class overcoming the results obtained by the sole non-intrusive standard described in ITU-T Recommendation P.563. Furthermore, subjective tests are carried out to validate the proposed classifier performance, and it reached an accuracy of 94.8%.

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13

Wei, B., H. Dong, J. D. Gibson, B. Wei, H. Dong, and J. D. Gibson. "Application of NB/WB AMR Speech Codecs in the 30-kHz TDMA System." IEEE Transactions on Wireless Communications 3, no. 6 (2004): 1897–901. http://dx.doi.org/10.1109/twc.2004.837468.

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14

Yeh, Ming-Che, Cheng-Yu Yeh, and Shaw-Hwa Hwang. "An Improved Version of Algebraic Codebook Search Algorithm for an AMR-WB Speech Coder." Informatica 28, no. 2 (2017): 403–14. http://dx.doi.org/10.15388/informatica.2017.135.

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15

Senapati, Rajiv, and Hemanta Kumar Pati. "VoLTE cell capacity estimation using AMR-WB codecs and considering VAF, SID, packet bundling, and TTI bundling." International Journal of Communication Systems 32, no. 11 (2019): e3958. http://dx.doi.org/10.1002/dac.3958.

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16

Boumaraf, Messaouda, and Fatiha Merazka. "Secure speech coding communication using hyperchaotic key generators for AMR-WB codec." Multimedia Systems, January 6, 2021. http://dx.doi.org/10.1007/s00530-020-00738-6.

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