Speech efficient coding method

Details Speech efficient coding method Speech efficient coding method

1994-07-26

1997-05-13

MacDonald, Allen R.

395 216, 395 214, 395 21, G10L 302, G10L 900

Patent

active

056300123

ABSTRACT:
There is provided a speech efficient coding method applicable to, e.g., analysis by a synthesis system such as an MBE vocoder, and comprising the steps of (a) dividing an input speech signal into block units on a time base, (b) dividing signals of each of the respective divided blocks into signals in a plurality of frequency bands, (c) discriminating whether signals of each of the respective divided frequency bands which are lower than a first frequency are voiced sound or unvoiced sound, (d) if the discrimination results in step (c) for a predetermined number of frequency bands is voiced sound, assigning a discrimination result of voiced sound to all frequency bands lower than a second frequency which is higher than the first frequency to obtain an ultimate discrimination result of voiced sound/unvoiced sound. Thus, even in the case where the pitch suddenly changes, or the harmonics structure is not precisely in correspondence with an integer multiple of the fundamental pitch period, a stable judgment of V (Voiced Sound) can be made.

REFERENCES:
patent: 5473727 (1995-12-01), Nishiguchi et al.
ICASSP 85 Proceedings, Tampa, USA, IEEE, Acoustics, Speech And Signal Processing Society, vol. 2, 1985, pp. 513-516, J. S. Lim: "A New Model-Based Speech Analysis/Synthesis System."
Speech Processing, Minneapolis, USA, Apr. 27-30, 1993, vol. 2 of 5, 27 Apr. 1993, Institute Of Electrical And Electronics Engineers, pp. 11-151-154, XP000427748 Nishiguchi M et al: "Vector Quantized MBE With simplified V/UV Division At 3.OKBPS."
Speech Processing 1, Albuquerque, USA, Apr. 3-6, 1990, vol. 1, 3 Apr. 1990, Institute Of Electrical And Electronics Engineers, pp. 249-252, XP000146452, McAulay R. J. et al: "Pitch Estimation And Voicing Detection Based On A Sinusoidal Speech Model 1."
Griffin Daniel W., Lim Jae S., Multiband Excitation Vocoder, IEEE Trans Acous Sp & Sig Proc, vol. 36 No. 8 Aug. 1988.
Nishiguchi N, et al, Vector Quantized MBE with Simplif. V/UV Div. at 3.0 KBPS, IEEE ICASSP-93 Apr. 1993.
Furui, S, Digital Speech Processing, Synthesis, and Recognition, Tokyo: Tokai Univ. Press Sep. 1985.

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