System for non linearity correction by intermediate frequency pr

Details System for non linearity correction by intermediate frequency pr System for non linearity correction by intermediate frequency pr

1983-01-13

1985-08-27

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, 307511, 328155, 455102, 455302, H04N 538, H04N 540

Patent

active

045381801

ABSTRACT:
In equipment for transmitting or re-transmitting television signals comprising, in the intermediate frequency stage, group propagation time correction cells for linearizing the phase-frequency characteristic of the equipment, the non linearity correction system of the invention uses these cells while completing them with an amplitude pre-modulation control circuit and/or a frequency premodulation control circuit, for correcting amplitude and phase non linearities affecting the pole carrier frequencies of the correction cells.

REFERENCES:
patent: 3628162 (1971-12-01), Lunden et al.
patent: 4249214 (1981-02-01), Boyd
patent: 4392252 (1983-07-01), Cluniat
"Correction of Phase Distortion in a TV Transmitter at Radio Frequencies", vol. 29/30, No. 11 (1975), pp. 19-25, by M. M. Kozlovskiy et al, Telecommunication and Radio Engineering.
"20 KW UHF Television Transmitter with All Solid State Driver for Klystron Amplifiers", Electrical Communication, vol. 48, No. 4 (1973), pp. 436-443, by J. Irmer et al.

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