Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1990-09-07
1992-09-29
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 36, 381 47, 381 37, G10L 300, G10L 500, G10L 702
Patent
active
051519410
ABSTRACT:
A digital signal encoding apparatus in which input digital signals are divided into a plurality of frequency bands so that the bandwidth of each frequency band will be greater the higher the frequency band, the allowable noise level is set for each frequency band on the basis of the energy value of each frequency band, and components of each frequency band are quantized with the number of bits consistent with the level difference between the energy of each frequency band and the preset allowable noise level. The output information volume following the quantization is detected and the number of bits of allocation for quantization is corrected in dependence upon the error between the detection output and the target value to render the information volume constant over a predetermined time period to enable bit rate adjustment or bit packing with lesser signal deterioration by a simplified construction.
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Fujiwara Yoshihito
Nishiguchi Masayuki
Umezawa Tomoko
Eslinger Lewis H.
Kemeny Emanuel S.
Maioli Jay H.
Sony Corporation
Tung Kee M.
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