8-kb/s Low-Delay Speech Coding with 4-ms Frame Size

Yoshiaki ASAKAWA; Preeti RAO; Hidetoshi SEKINE

8-kb/s Low-Delay Speech Coding with 4-ms Frame Size

Yoshiaki ASAKAWA, Preeti RAO, Hidetoshi SEKINE

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This paper describes modifications to a previously proposed 8-kb/s 4-ms-delay CELP speech coding algorithm with a view to improving the speech quality while maintaining low delay and only moderately increasing complexity. The modifications are intended to improve the effectiveness of interframe pitch lag prediction and the sub-optimality level of the excitation coding to the backward adapted synthesis filter by using delayed decision and joint optimization techniques. Results of subjective listening tests using Japanese speech indicate that the coded speech quality is significantly superior to that of the 8-kb/s VSELP coder which has a 20-ms delay. A method that reduces the computational complexity of closed-loop 3-tap pitch prediction with no perceptible degradation in speech quality is proposed, based on representing the pitch-tap vector as the product of a scalar pitch gain and a normalized shape codevector.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E78-A No.8 pp.927-933

Publication Date: 1995/08/25

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Type of Manuscript: Special Section PAPER (Special Section on Digital Signal Processing)

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Yoshiaki ASAKAWA, Preeti RAO, Hidetoshi SEKINE, "8-kb/s Low-Delay Speech Coding with 4-ms Frame Size" in IEICE TRANSACTIONS on Fundamentals, vol. E78-A, no. 8, pp. 927-933, August 1995, doi: .
Abstract: This paper describes modifications to a previously proposed 8-kb/s 4-ms-delay CELP speech coding algorithm with a view to improving the speech quality while maintaining low delay and only moderately increasing complexity. The modifications are intended to improve the effectiveness of interframe pitch lag prediction and the sub-optimality level of the excitation coding to the backward adapted synthesis filter by using delayed decision and joint optimization techniques. Results of subjective listening tests using Japanese speech indicate that the coded speech quality is significantly superior to that of the 8-kb/s VSELP coder which has a 20-ms delay. A method that reduces the computational complexity of closed-loop 3-tap pitch prediction with no perceptible degradation in speech quality is proposed, based on representing the pitch-tap vector as the product of a scalar pitch gain and a normalized shape codevector.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e78-a_8_927/_p

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@ARTICLE{e78-a_8_927,
author={Yoshiaki ASAKAWA, Preeti RAO, Hidetoshi SEKINE, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={8-kb/s Low-Delay Speech Coding with 4-ms Frame Size},
year={1995},
volume={E78-A},
number={8},
pages={927-933},
abstract={This paper describes modifications to a previously proposed 8-kb/s 4-ms-delay CELP speech coding algorithm with a view to improving the speech quality while maintaining low delay and only moderately increasing complexity. The modifications are intended to improve the effectiveness of interframe pitch lag prediction and the sub-optimality level of the excitation coding to the backward adapted synthesis filter by using delayed decision and joint optimization techniques. Results of subjective listening tests using Japanese speech indicate that the coded speech quality is significantly superior to that of the 8-kb/s VSELP coder which has a 20-ms delay. A method that reduces the computational complexity of closed-loop 3-tap pitch prediction with no perceptible degradation in speech quality is proposed, based on representing the pitch-tap vector as the product of a scalar pitch gain and a normalized shape codevector.},
keywords={},
doi={},
ISSN={},
month={August},}

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TY - JOUR
TI - 8-kb/s Low-Delay Speech Coding with 4-ms Frame Size
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 927
EP - 933
AU - Yoshiaki ASAKAWA
AU - Preeti RAO
AU - Hidetoshi SEKINE
PY - 1995
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E78-A
IS - 8
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - August 1995
AB - This paper describes modifications to a previously proposed 8-kb/s 4-ms-delay CELP speech coding algorithm with a view to improving the speech quality while maintaining low delay and only moderately increasing complexity. The modifications are intended to improve the effectiveness of interframe pitch lag prediction and the sub-optimality level of the excitation coding to the backward adapted synthesis filter by using delayed decision and joint optimization techniques. Results of subjective listening tests using Japanese speech indicate that the coded speech quality is significantly superior to that of the 8-kb/s VSELP coder which has a 20-ms delay. A method that reduces the computational complexity of closed-loop 3-tap pitch prediction with no perceptible degradation in speech quality is proposed, based on representing the pitch-tap vector as the product of a scalar pitch gain and a normalized shape codevector.
ER -