Communication system compandor

Details Communication system compandor Communication system compandor

1982-12-20

1985-05-21

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358138, 381 34, H04N 712

Patent

active

045189943

ABSTRACT:
In a signal transmission system comprising a transmitter, a transmission medium, and a receiver which collectively form a transmission path, an improvement for processing the signal to enable the transmission thereof over a narrower bandwidth and comprising first logic for decreasing and increasing, respectively, the rate of change of amplitude (dA/dt) of first and second portions of the signal, respectively, whose dA/dt's exceed or are less than a predetermined dA/dt, by amounts which increase at a non-linear rate as the dA/dt of the first and second portions increase or decrease, respectively, to produce a processed signal whose maximum and minimum dA/dt's define a bandwidth narrower than that of the unprocessed signal. Second logic is provided for altering the dA/dt of the processing signal at the receiver in a manner which is the reciprocal of the changes in dA/dt which occurred at the transmitter to reproduce the unprocessed signal.

REFERENCES:
patent: Re30468 (1980-12-01), Dolby et al.
patent: 3795876 (1974-03-01), Takahashi et al.
patent: 4054909 (1977-10-01), Kojima et al.
patent: 4163258 (1979-07-01), Ebihara et al.
patent: 4191968 (1980-03-01), Kirk, Jr.
patent: 4200889 (1980-04-01), Strobele

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