Frequency converting apparatus for converting an RF television s

Details Frequency converting apparatus for converting an RF television s Frequency converting apparatus for converting an RF television s

1988-03-08

1988-12-06

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 23, 358160, 358174, 455265, H04N 514, H04N 544

Patent

active

047898976

ABSTRACT:
A frequency converter circuit for television signals is disclosed which contains a tuner and a low-IF converter which converts the television signal to a low IF signal to obtain adjacent-channel selectivity with low-pass filters. The low-IF converter further includes a phase-correcting stage and an amplitude-correcting stage for the two quadrature-signal paths. By digitizing the two signal paths after the first quadrature mixing process, their amplitude and phase stability is further improved.

REFERENCES:
patent: 4633315 (1986-12-01), Kasperkovitz
patent: 4642675 (1987-02-01), Gassmann
Proceedings of the IRE, "A Third Method of Generation and Detection of Single-Sideband Signals", Donald K. Weaver, Jr., pp. 1703-1705, Dec. 1956.

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