System and method of frequency calibration in a linked compressi

Details System and method of frequency calibration in a linked compressi System and method of frequency calibration in a linked compressi

1989-06-09

1991-11-12

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

With control signal

455337, 381106, 333 14, H04B 164, A03G 700

Patent

active

050654519

ABSTRACT:
A linked compressor-expander (Lincompex) circuit for use in telecommunications utilizes a frequency compensation circuit to frequency shift the total bandwidth of the whole communication channel to eliminate single side band "duck-talk" and data distortion in the transmitting of a complex waveform due to frequency drift or the detuning of the transmitter/receiver system. The demodulator includes an expander for expanding the compressed voice or data signal and a control tone conversion circuit for converting the received control tone into a frequency signal to be used by the expander. The control tone conversion circuit also determines the frequency error of a combination information waveform so that the frequency compensation circuit can carry out the proper frequency shifting process. A fading regulator is also provided to remove any audible level variations not removed by the automatic gain control circuitry in the receiver.

REFERENCES:
patent: 4250470 (1981-02-01), Szarvas
patent: 4271499 (1981-06-01), Leveque
patent: 4653117 (1987-03-01), Heck
patent: 4893347 (1990-01-01), Eastmond et al.
Russell, Program Lincompex, International Broadcasting Convention, Brighton, England (Sep. 20-23, 1980).
Cannon, Recording or Broadcasting Utilizing Automatic Gain Control Compressor, IBM Technical Disclosure Bulletin, vol. 10, No. 12, May 1968.

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