Ghost cancellation circuit system

Details Ghost cancellation circuit system Ghost cancellation circuit system

1979-07-26

1981-08-18

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 37, 358166, 358905, H04N 521

Patent

active

042850061

ABSTRACT:
A ghost cancellation circuit system comprises an amplifier for forming an output signal of a composite wave of a direct wave and a ghost wave; a carrier wave extracting circuit for extracting the carrier wave having the reference phase from the output signals of the amplifier; phase shifting means for generating a detection axis signal having the specific phase of the output of the carrier wave extracting circuit; a pair of phase detection circuits for a phase detection of the output of the amplifier by the detection axis signal of the phase shifting means or the carrier wave extracting circuit, and a delay circuit for forming the output in delay for a time substantially equal to the delay time of the ghost wave by receiving the output of the pair of phase detection circuits through a pair of coefficient circuits, whereby at least a specific component of the ghost wave is cancelled by summing the output of the delay circuit to the output of the phase detection circuit.

REFERENCES:
patent: 3988775 (1976-10-01), Nakagawa
patent: 4006421 (1977-02-01), Mermoz
patent: 4047224 (1977-09-01), Yamaguti
patent: 4081837 (1978-03-01), Tada et al.
patent: 4128848 (1978-12-01), Nakagawa
IEEE Journal of Solid-State Circuits, Aug. 1975, pp. 247-249.
IEEE Transactions on Consumer Electronics, vol. CE-23, No. 3, Aug. 1977, pp. 327-334.

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