System for transmitting a coded voice signal

Details System for transmitting a coded voice signal System for transmitting a coded voice signal

1974-06-12

1977-03-15

Claffy, Kathleen H.

H04J 500

Patent

active

040125955

ABSTRACT:
A system for transmitting a coded voice signal representative of an original analogue voice signal, for improved performance in time assignment multiplex systems. A voice signal detector detects when the magnitude of the coded voice signal exceeds a certain predetermined value which corresponds to the presence of an original voice signal. A waveform analyzer estimates high frequency components of the original voice signal and the detected coded voice signal is transmitted at intervals determined by the measured values of the high frequency components. The transmitted coded voice signal is comprised of digital code units, and the number of bits in each code unit are reduced at low transmission speed by distributing the bits of the code units between more than one transmission interval.

REFERENCES:
patent: 3403227 (1968-09-01), Malm
patent: 3790715 (1974-02-01), Inose et al.
patent: 3848093 (1974-11-01), Edstrom
patent: 3864524 (1975-02-01), Walker
David, McDonald "Note on Pitch-Synchronous Processing of Speech", Bell Monograph, 1956.

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