Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1983-03-01
1986-09-09
Shaw, Gareth D.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
1791706, 340347AD, 340347M, 367 65, G10L 500
Patent
active
046113428
ABSTRACT:
An apparatus for use in transmitting compressed digital voice data includes an analyzer for compressing digitized voice data according to an algorithm which produces a root mean square of the voice data. An analog to digital converter is used to convert analog voice signals to digital data as an input to the analyzer. An AGC circuit controls to analog voice signal to keep it within predetermined limits for digitization, with the AGC setting being determined by the root mean square of the digitized data. The digitized data includes data representative of the root mean square adjusted by the inverse of the change induced by the AGC. A speech synthesizer expands the digitized data at a remote location to convert it back to analog speech signals.
REFERENCES:
patent: 3821494 (1974-06-01), Besseyre
patent: 4016557 (1977-04-01), Zitelli et al.
patent: 4051332 (1977-09-01), Izumi et al.
patent: 4213097 (1980-07-01), Chiu et al.
patent: 4230906 (1980-10-01), Davis
Chiu Ran F.
Joerger Richard B.
Miller William J.
Newdeck Frank W.
Racal Data Communications Inc.
Salotto John J.
Shaw Gareth D.
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