1981-07-31
1983-07-26
Stellar, George G.
179 1R, 179111E, 179121R, H04M 100, H04R 300, H04R 1900, H04R 2300
Patent
active
043955932
ABSTRACT:
An arrangement for directly converting speech waves into coded digital signals includes a vibratory diaphragm secured at an aperture in a closed chamber. The diaphragm vibrates responsive to the difference between the speech waves and sound waves radiated into the chamber from a digital signal to sound converter through a second aperture. Apparatus connected to the diaphragm generates a quantized signal responsive to the diaphragm motion and a digital code generator produces a sequence of digital coded signals corresponding to the quantized signals. The coded signals from the digital code generator are delayed and supplied to the sound converter whereby a differential pulse code modulated signal representative of the speech waves is produced.
REFERENCES:
patent: 3286032 (1966-11-01), Baum
patent: 3622791 (1971-11-01), Bernard
patent: 3626096 (1971-12-01), Von Muench et al.
patent: 4194095 (1980-03-01), Doi et al.
Bell Telephone Laboratories Incorporated
Cubert Jack Saul
Olsen Kurt C.
Stellar George G.
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