Long term predictor

Details Long term predictor Long term predictor

1995-12-21

1998-02-17

MacDonald, Allen R.

395 271, 395 228, G10L 302, G10L 900, G10L 502

Patent

active

057199930

ABSTRACT:
An improved long-term predictor (LTP) for use in analysis-by-synthesis coding systems, such as CELP is disclosed. The invention provides control of the periodicity of speech signals generated by the LTP. This control facilitates a reduction in perceptible noise/buzziness in reconstructed speech. An embodiment of the invention includes a conventional LTP in combination with a two-tap finite impulse response filter. The filter augments operation of the LTP by generating precursor signals of LTP output signals. These precursor signals are combined with the LTP output signals to form the output of the improved LTP.

REFERENCES:
patent: 4980916 (1990-12-01), Zinser
patent: 5093863 (1992-03-01), Galand et al.
patent: 5195168 (1993-03-01), Yong
patent: 5267317 (1993-11-01), Kleijn
patent: 5327520 (1994-07-01), Chen
Kleijn, et al. "Generalized Analysis-By-Synthesis Coding and Its Application to Pitch Prediction", 1992 IEEE, ICASSP, vol. 1 (1992) pp. 337-340.
Marques, et al. "Improved Pitch prediction With Fractional Delays in Celp Coding", 1990 ICASSP, vol. 2 (1990), pp. 665-668.
Tzeng, "Pitch-Tracked Celp Speech Coding With Transparent DTMF Signalling", 3rd IEEE Int'l Symposium on Personal, Indoor & Mobile Radio Commun. Proc., 1992, pp. 670-674.

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