Method and apparatus for digitally implementing a linked compres

Details Method and apparatus for digitally implementing a linked compres Method and apparatus for digitally implementing a linked compres

1978-07-12

1981-06-02

Stewart, David L.

Multiplex communications

Wide area network

Packet switching

370 94, 370111, H04J 318

Patent

active

042714990

ABSTRACT:
A linked compressor-expander (LINCOMPEX) circuit for use in telecommunications is implemented digitally. A speech compressor circuit in a modulator and a speech expander circuit in a demodulator controllably attenuate given syllables of a speech signal by values determined in response to binary input signals which collectively represent the amplitude of a given symbol of the speech signal. A control tone signal is generated by the modulator, and the demodulator is responsive to the control tone signal for operating the voltage attenuator circuit of the digital expander to thereby reconstruct the speech signal. Calibrate circuitry is provided for periodically detecting a test frequency of the control tone generator during a brief period prior to transmission of syllables of the speech signal. Also included is a data multiplexing circuit for transmitting and receiving data between speech syllables to optimize transmitter loading.

REFERENCES:
patent: 3311704 (1967-03-01), Filipowski
patent: 3500441 (1970-03-01), Brown
patent: 3586781 (1971-06-01), Jones
patent: 3895322 (1975-07-01), Stewart
patent: 3988545 (1976-10-01), Kuemmerle
patent: 4063220 (1977-12-01), Metcalfe
patent: 4074232 (1978-02-01), Otomo
patent: 4123711 (1978-10-01), Chow

Affiliated with

Also associated with

Rating

Method and apparatus for digitally implementing a linked compres does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for digitally implementing a linked compres, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for digitally implementing a linked compres will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1868541