Combined residual and analysis-by-synthesis pitch-dependent gain

Details Combined residual and analysis-by-synthesis pitch-dependent gain Combined residual and analysis-by-synthesis pitch-dependent gain

1998-10-14

2000-06-06

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704219, 704225, G10L 1104, G10L 1912

Patent

active

060730935

ABSTRACT:
A vocoder transmitter (12) sends coded speech to a vocoder receiver (16) over a limited-bandwidth channel (14). The transmitter includes a LPC-residual-based first gain estimator (46), which gain value works well with women's voices, but less so with men's. A second, analysis-by-synthesis, gain estimator (42) therein, uses a unit-gain version (342) of the receiver's synthesizer, whose input (24) and output (310) speech power is estimated, to produce the second gain value from their ratio (312). The second gain value has been found to work well with men's voices, but to produce "explosive" artifacts with women's. A combiner (518) weights these two gain estimates, under control of the estimated pitch, to produce the vocoder gain estimate transmitted to the vocoder receiver (16). In a particular embodiment the first gain estimate predominates at low pitch periods, and the second gain estimate at higher ones, with crossover at about 45 sample lags for an 8000 Hz sampling rate.

REFERENCES:
patent: 4797929 (1989-01-01), Gerson et al.
patent: 4905288 (1990-02-01), Gerson et al.
patent: 5151968 (1992-09-01), Tanaka et al.
patent: 5710863 (1998-01-01), Chen
patent: 5790759 (1998-08-01), Chen

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