Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1989-12-19
1991-10-01
Harkcom, David D.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 30, 381 31, 381 36, G10L 500
Patent
active
050540734
ABSTRACT:
In a method and apparatus for the analysis and synthesis of voice signals wherein frequency bands of voice signals are divided into several sub-bands with subsequent separate coding and synthesis of each subdivision channel signals, the amplitude level of each subdivision channel signal in a predetermined interval of time (frame length) is evaluated and only those subdivision channel signals for which the above-mentioned amplitude level exceeds a predetermined reference level established for each subdivision channel is coded.
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The Bell System Technical Journal, vol. 55, No. 8, Oct. 1976, pp. 1069-1085, "Digital Coding of Speech in Sub-bands", by R. E. Crochiere et al.
Harkcom David D.
Knepper Gary V.
OKI Electric Industry Co., Ltd.
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