Low bit-rate pattern encoding and decoding capable of reducing a

Details Low bit-rate pattern encoding and decoding capable of reducing a Low bit-rate pattern encoding and decoding capable of reducing a

1985-12-24

1989-04-11

Salce, Patrick R.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

3645135, G10L 904

Patent

active

048213241

ABSTRACT:
In an encoder operable in response to a discrete pattern signal divisible into a sequence of segments to produce an output code sequence, each segment is produced during a frame and specified by representative excitation signals extracted from each segment. The representative excitation signals may be representative pulses placed in a selected one of subframes formed by dividing the frame with reference to a spectral parameter and a pitch parameter extracted from each segment. Alternatively, the representative excitation signals may be either a combination of the representative pulses and a noise or a noise alone. The representative pulses and the spectral parameters may be subjected to interpolation. In a decoder for decoding the output code sequence into a reproduction of the discrete pattern signal, the representative pulses are interpolated to arrange excitation pulses in all of subframes of each frame and to produce an excitation vocal source signal. The excitation vocal source signal may also be produced by the use of a decoded noise. A synthesizing filter circuit is driven by the excitation vocal source signal to produce the reproduction.

REFERENCES:
patent: 4618982 (1986-10-01), Horvath et al.
patent: 4716592 (1987-12-01), Ozawa et al.

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