Synchronous demodulation circuit for a carrier-modulated televis

Details Synchronous demodulation circuit for a carrier-modulated televis Synchronous demodulation circuit for a carrier-modulated televis

1989-03-06

1990-05-29

Shepperd, John W.

Demodulators

Amplitude modulation demodulator

Input signal combined with local oscillator or carrier...

329363, 358188, H03D 100

Patent

active

049299050

ABSTRACT:
In a synchronous demodulation circuit for an IF television signal, having a passive carrier regenerator (37, 39), a quadrature component unwantedly demodulated by a synchronous in-phase demodulator (15) is compensated for by multiplying the output signal of this demodulator by the integrated (63) output signal of a synchronous in-phase demodulator (25) and by adding (79) the product obtained to the product of the output signal of a synchronous quadrature demodulator (19) and the integrated (65) output signal of a synchronous quadrature demodulator (29).

REFERENCES:
patent: 4157569 (1979-06-01), Apeldoorn et al.
patent: 4264975 (1981-04-01), Voorman
patent: 4633315 (1986-12-01), Kasperkovitz
patent: 4642675 (1987-02-01), Gassmann
patent: 4789897 (1988-12-01), Kappeler et al.

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