The Experts below are selected from a list of 15120 Experts worldwide ranked by ideXlab platform
Vishu R Viswanathan - One of the best experts on this subject based on the ideXlab platform.
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a variable Rate multimodal speech coder with gain matched analysis by synthesis
International Conference on Acoustics Speech and Signal Processing, 1997Co-Authors: Erdal Paksoy, Alan V Mccree, Vishu R ViswanathanAbstract:In general, a variable Rate coder can obtain the same speech quality as a fixed Rate coder, while reducing the Average Bit Rate. We have developed a variable-Rate multimodal speech coder with an Average Bit Rate of 3 kb/s for a speech activity factor of 80% and quality comparable to the GSM full Rate coder. The coder has four coding modes and uses a robust classification method involving the pitch gain, zero crossings, and a peakiness measure. Also the coder employs a novel gain-matched analysis-by-synthesis technique for very low Rate coding of unvoiced frames and an improved noise-level-dependent postfilter. This paper describes the details of our algorithm and presents the results from subjective listening tests.
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ICASSP - A variable Rate multimodal speech coder with gain-matched analysis-by-synthesis
1997 IEEE International Conference on Acoustics Speech and Signal Processing, 1Co-Authors: Erdal Paksoy, Alan V Mccree, Vishu R ViswanathanAbstract:In general, a variable Rate coder can obtain the same speech quality as a fixed Rate coder, while reducing the Average Bit Rate. We have developed a variable-Rate multimodal speech coder with an Average Bit Rate of 3 kb/s for a speech activity factor of 80% and quality comparable to the GSM full Rate coder. The coder has four coding modes and uses a robust classification method involving the pitch gain, zero crossings, and a peakiness measure. Also the coder employs a novel gain-matched analysis-by-synthesis technique for very low Rate coding of unvoiced frames and an improved noise-level-dependent postfilter. This paper describes the details of our algorithm and presents the results from subjective listening tests.
Krishnaswamy Srinivasan - One of the best experts on this subject based on the ideXlab platform.
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Variable Bit-Rate CELP coding of speech with phonetic classification
European Transactions on Telecommunications, 2010Co-Authors: E. Paksoy, Allen Gersho, Krishnaswamy SrinivasanAbstract:A variable Bit-Rate speech coder intended for digital cellular applications is described. A voice activity detection algorithm is used to distinguish active speech from background noise. Each frame of active speech is further classified to distinguish between three phonetic categories: voiced, unvoiced, and onset. Each input frame is assigned one of five Bit Rates according to voice activity and phonetic classification and coded using an analysis-by-synthesis algorithm tailored to the needs of the class that it belongs to. The resulting coder, called Variable Rate Phonetic Segmentation, produces good quality speech at an Average Bit-Rate below 3 kBit/s when operating with a voice activity factor of 0.5. Informal subjective quality assessment for speech in clean and noisy backgrounds indicates a performance that is comparable to the TIA standard QCELP algorithm while operating at a 25% to 40% lower Average Bit Rate.
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ICASSP (2) - Variable Rate speech coding with phonetic segmentation
IEEE International Conference on Acoustics Speech and Signal Processing, 1993Co-Authors: E. Paksoy, Krishnaswamy Srinivasan, Allen GershoAbstract:A speech coder based on variable Rate phonetic segmentation (VRPS), operating at an Average Rate of 3 kBit/s and applicable to code division multiple access (CDMA) digital cellular systems, is presented. An improved version of the voice activity detection scheme used in the GSM (Group Special Mobile) full-Rate cellular standard tracks the bursty character of active speech. Each frame of active speech is classified into one of a set of four phonetic categories. A distinct coding configuration and Bit-Rate are applied to each category. The tradeoff between subjective quality and Average Bit Rate of VRPS for both clean speech and speech corrupted with vehicle noise is superior to that obtained by QCELP, a proposed TIA speech coding standard for wideband digital cellular networks. The Average Bit-Rate of VRPS is generally lower than that of QCELP for the same input signals. >
E. Paksoy - One of the best experts on this subject based on the ideXlab platform.
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Variable Bit-Rate CELP coding of speech with phonetic classification
European Transactions on Telecommunications, 2010Co-Authors: E. Paksoy, Allen Gersho, Krishnaswamy SrinivasanAbstract:A variable Bit-Rate speech coder intended for digital cellular applications is described. A voice activity detection algorithm is used to distinguish active speech from background noise. Each frame of active speech is further classified to distinguish between three phonetic categories: voiced, unvoiced, and onset. Each input frame is assigned one of five Bit Rates according to voice activity and phonetic classification and coded using an analysis-by-synthesis algorithm tailored to the needs of the class that it belongs to. The resulting coder, called Variable Rate Phonetic Segmentation, produces good quality speech at an Average Bit-Rate below 3 kBit/s when operating with a voice activity factor of 0.5. Informal subjective quality assessment for speech in clean and noisy backgrounds indicates a performance that is comparable to the TIA standard QCELP algorithm while operating at a 25% to 40% lower Average Bit Rate.
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ICASSP (2) - Variable Rate speech coding with phonetic segmentation
IEEE International Conference on Acoustics Speech and Signal Processing, 1993Co-Authors: E. Paksoy, Krishnaswamy Srinivasan, Allen GershoAbstract:A speech coder based on variable Rate phonetic segmentation (VRPS), operating at an Average Rate of 3 kBit/s and applicable to code division multiple access (CDMA) digital cellular systems, is presented. An improved version of the voice activity detection scheme used in the GSM (Group Special Mobile) full-Rate cellular standard tracks the bursty character of active speech. Each frame of active speech is classified into one of a set of four phonetic categories. A distinct coding configuration and Bit-Rate are applied to each category. The tradeoff between subjective quality and Average Bit Rate of VRPS for both clean speech and speech corrupted with vehicle noise is superior to that obtained by QCELP, a proposed TIA speech coding standard for wideband digital cellular networks. The Average Bit-Rate of VRPS is generally lower than that of QCELP for the same input signals. >
Erdal Paksoy - One of the best experts on this subject based on the ideXlab platform.
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a variable Rate multimodal speech coder with gain matched analysis by synthesis
International Conference on Acoustics Speech and Signal Processing, 1997Co-Authors: Erdal Paksoy, Alan V Mccree, Vishu R ViswanathanAbstract:In general, a variable Rate coder can obtain the same speech quality as a fixed Rate coder, while reducing the Average Bit Rate. We have developed a variable-Rate multimodal speech coder with an Average Bit Rate of 3 kb/s for a speech activity factor of 80% and quality comparable to the GSM full Rate coder. The coder has four coding modes and uses a robust classification method involving the pitch gain, zero crossings, and a peakiness measure. Also the coder employs a novel gain-matched analysis-by-synthesis technique for very low Rate coding of unvoiced frames and an improved noise-level-dependent postfilter. This paper describes the details of our algorithm and presents the results from subjective listening tests.
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ICASSP - A variable Rate multimodal speech coder with gain-matched analysis-by-synthesis
1997 IEEE International Conference on Acoustics Speech and Signal Processing, 1Co-Authors: Erdal Paksoy, Alan V Mccree, Vishu R ViswanathanAbstract:In general, a variable Rate coder can obtain the same speech quality as a fixed Rate coder, while reducing the Average Bit Rate. We have developed a variable-Rate multimodal speech coder with an Average Bit Rate of 3 kb/s for a speech activity factor of 80% and quality comparable to the GSM full Rate coder. The coder has four coding modes and uses a robust classification method involving the pitch gain, zero crossings, and a peakiness measure. Also the coder employs a novel gain-matched analysis-by-synthesis technique for very low Rate coding of unvoiced frames and an improved noise-level-dependent postfilter. This paper describes the details of our algorithm and presents the results from subjective listening tests.
Allen Gersho - One of the best experts on this subject based on the ideXlab platform.
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Variable Bit-Rate CELP coding of speech with phonetic classification
European Transactions on Telecommunications, 2010Co-Authors: E. Paksoy, Allen Gersho, Krishnaswamy SrinivasanAbstract:A variable Bit-Rate speech coder intended for digital cellular applications is described. A voice activity detection algorithm is used to distinguish active speech from background noise. Each frame of active speech is further classified to distinguish between three phonetic categories: voiced, unvoiced, and onset. Each input frame is assigned one of five Bit Rates according to voice activity and phonetic classification and coded using an analysis-by-synthesis algorithm tailored to the needs of the class that it belongs to. The resulting coder, called Variable Rate Phonetic Segmentation, produces good quality speech at an Average Bit-Rate below 3 kBit/s when operating with a voice activity factor of 0.5. Informal subjective quality assessment for speech in clean and noisy backgrounds indicates a performance that is comparable to the TIA standard QCELP algorithm while operating at a 25% to 40% lower Average Bit Rate.
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ICASSP (2) - Variable Rate speech coding with phonetic segmentation
IEEE International Conference on Acoustics Speech and Signal Processing, 1993Co-Authors: E. Paksoy, Krishnaswamy Srinivasan, Allen GershoAbstract:A speech coder based on variable Rate phonetic segmentation (VRPS), operating at an Average Rate of 3 kBit/s and applicable to code division multiple access (CDMA) digital cellular systems, is presented. An improved version of the voice activity detection scheme used in the GSM (Group Special Mobile) full-Rate cellular standard tracks the bursty character of active speech. Each frame of active speech is classified into one of a set of four phonetic categories. A distinct coding configuration and Bit-Rate are applied to each category. The tradeoff between subjective quality and Average Bit Rate of VRPS for both clean speech and speech corrupted with vehicle noise is superior to that obtained by QCELP, a proposed TIA speech coding standard for wideband digital cellular networks. The Average Bit-Rate of VRPS is generally lower than that of QCELP for the same input signals. >
