Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1986-11-24
1989-03-07
Shoop, Jr., William M.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 36, 381 40, 381 47, 375 26, G10L 702
Patent
active
048113980
ABSTRACT:
According to the coding method, the digital speech signal is split into subbands; each subband is coded independently of the others. The first two subbands undergo an adaptive linear prediction operation yielding a residual, normalized with respect to a quantized r.m.s. value; the residual samples are quantized and coded by a variable bit number. As to the third subband the samples normalized with respect to a quantized gain term are directly quantized and coded by a variable bit number. While splitting the subband signals into sample blocks, for the first two subbands the coefficient vectors of subband linear prediction filters relevant to each block are also determined by vector quantization and linear prediction inverse filtering operations; quantized r.m.s. values are also determined to calculate the numbers of bits permitting subband signals coding. The coded signal consists of subband signal quantization level indices, of r.m.s. value quantization level indices, and of linear prediction filter coefficient vector indices.
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Fully Vector-Quantized Subband Coding with Adaptive Codebook Allocation ICASSP 84, vol. 1 of 3, 107.1-107.4, Gersho et al.
The Design of a 16 KB/S Split-Band Adaptive Predictive Coder for Noisy Channels, Cheung et al., ICASSP 81, 631-635, 1981.
A Multirate Voice Digitizer Based Upon Vector Quantization, pp. 721-727, Guillermo Rebolledo, et al., IEEE Transactions on Communications, vol. Com-30, No. 4, Apr. 1982.
A New Dynamic Bit Allocation Scheme for Sub-Band Coding, vol. 4 of 4, ICASSP 85 43.2.1-43.2.4, Hamel et al.
Copperi Maurizio
Sereno Daniele
Cselt-Centro Studi e Laboratori Telecomunicazioni S.p.A.
Dubno Herbert
Shoop Jr. William M.
Young Brian
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