Low bit-rate pattern encoding and decoding with a reduced number

Details Low bit-rate pattern encoding and decoding with a reduced number Low bit-rate pattern encoding and decoding with a reduced number

1985-07-05

1990-07-31

Harkcom, Gary V.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

G10L 702

Patent

active

049455656

ABSTRACT:
In an encoder operable in response to a discrete pattern signal divisible into a succession of segments to produce an output code sequence, a pitch parameter and a spectral parameter are extracted in a parameter calculator from each segment and from a spectral interval. In an excitation pulse producing circuit, each spectral interval is divided into a plurality of subframes, namely, pitch periods with reference to the pitch parameter to divide each segment. A minor group of excitation pulses is calculated from the segment at every subframe to form a major group of the excitation pulses in the spectral interval. The excitation pulses of the major group are reduced in number with reference to adjacent ones of the minor groups in each spectral interval and are modified into a succession of modified excitation pulses. The modified excitation pulses are combined with the spectral parameter into the output code sequence. In a decoder, the modified excitation pulses and the spectral parameter are extracted from the output code sequence. The pitch parameter is recovered by the use of the extracted and mofified excitation pulses and is used to produce a reproduction of the discrete pattern signal. Alternatively, the pitch parameter may be sent from the encoder together with the spectral parameter and the modified excitation pulses as the output code sequence and extracted from the output code sequence in the decoder.

REFERENCES:
patent: 3467783 (1969-09-01), Magnuski
patent: 3659052 (1972-04-01), Slavin
patent: 4220819 (1980-09-01), Atal
patent: 4301329 (1981-11-01), Taguchi
patent: 4618982 (1986-10-01), Horvath et al.
patent: 4669120 (1987-05-01), Ono
patent: 4701954 (1987-10-01), Atal
patent: 4709390 (1987-11-01), Atal et al.
patent: 4720865 (1988-01-01), Taguchi
Max-"Quantizing for Minimum Distortion", Joel Max, pp. 7-12, 1960.
IEEE Transactions on Acoustics Speech and Signal Processing, "Real-Time Domain Harmonic Scaling of Speech for Rate Modification and Coding", vol. ASSP 31, No. 1, Feb. 1983, R. Cox et al.

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