Crosstalk cancelling circuit for removing crosstalk component fr

Details Crosstalk cancelling circuit for removing crosstalk component fr Crosstalk cancelling circuit for removing crosstalk component fr

1989-10-05

1992-02-25

Envall, Jr., Roy N.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358310, 358340, H04N 979, H04N 988

Patent

active

050917889

ABSTRACT:
A crosstalk cancelling circuit for use in video tape recorders. The cancelling circuit comprises a first multiplier for multiplying a frequency-lowered conversion chrominance signal reproduced from a magnetic tape by a local oscillating signal with a predetermined frequency and a delay device for delaying the frequency-lowered conversion chrominance signal by one horizontal scanning period. The local oscillating signal is further supplied to a phase-shifting circuit which in turn produces either a signal leading the local oscillating signal by a phase angle of 90.degree. or a signal lagging the local oscillating signal by a phase difference of 90.degree. in synchronism with a field frequency of the frequency-lowered conversion chrominance signal. Also included in the cancelling circuit is a second multiplier for multiplying the output of the delay device by the output of the phase-shifting circuit, the output of which is fed to an operation circuit for effecting addition or subtraction between the output of the first multiplier and the output of the second multiplier to output the result as a carrier chrominance signal.

REFERENCES:
patent: 4807048 (1990-02-01), Yasuda
patent: 4969033 (1990-11-01), Yamada et al.

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