Multi-pulse voice encoder with pitch prediction in a cross-corre

Details Multi-pulse voice encoder with pitch prediction in a cross-corre Multi-pulse voice encoder with pitch prediction in a cross-corre

1989-03-28

1990-10-09

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

G10L 500

Patent

active

049625365

ABSTRACT:
In a pulse searching arrangement (65) of a multi-pulse voice encoder comprising a linear prediction residual signal producing arrangement (61), a pitch period is predicted in a cross-correlation domain in each subframe of a frame of an input voice signal. For this purpose, a local signal producing circuit comprises a first cross-correlator (66) for producing a first cross-correlation signal related to a linear prediction residual signal. A buffer memory (32) produces an output cross-correlation signal from subframe to subframe. Supplied with a sum signal and controlled by a pitch period signal representative of pitch periods of the input voice signal, a pitch synthesizing filter (71) produces a synthesized signal, which is added to provide the sum signal to a signal representative of excitation pulses. Responsive to the synthesized signal, a second cross-correlator (67) produces a second cross-correlation signal, which is subtracted from the output cross-correlation signal to provide the local signal. Supplied with an autocorrelation signal, a pulse searcher (44) searches the excitation pulses in the local signal.

REFERENCES:
patent: 4776015 (1988-10-01), Takeda et al.
Ozawa et al., "High Quality Multi-Pulse Speech coder with Pitch Prediction", Proceedings of ICASSP 86 (IEEE-IECEJ-ASJ International Conference on Acoustics, Speech, and Signal Processing), Article No. 33.3, Apr. 10, 1986, pp. 1689-1692.

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