Auto-tuning circuit for an active filter used in video signal pr

Details Auto-tuning circuit for an active filter used in video signal pr Auto-tuning circuit for an active filter used in video signal pr

1990-09-28

1991-12-10

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

331 14, H04N 504

Patent

active

050722980

ABSTRACT:
An auto-tuning circuit for automatically adjusting the transfer function of an active filter for processing video signals. A voltage-controlled filter is used as active filter, for imparting a predetermined transfer characteristic to a signal having a component related to a television signal. The transfer characteristic can be adjusted in accordance with a voltage. The auto-tuning circuit comprises PLL section connected to the voltage-controlled filter, and switching circuit. The PLL section applies to the voltage-controlled filter a control voltage corresponding to the phase difference between a reference signal and an output signal obtained by passing the reference signal through the voltage-controlled filter. The switching section allows transfer of signals between the voltage-controlled filter and the PLL section for at least one of the horizontal blanking period and vertical blanking period of the television signal.

REFERENCES:
patent: 3793594 (1974-02-01), Griswold
patent: 4123726 (1978-10-01), Schucht
patent: 4748422 (1988-05-01), Matsumoto et al.
patent: 4802009 (1989-01-01), Hartmeier
patent: 4812783 (1989-03-01), Honjo et al.
patent: 4884040 (1989-11-01), Fling
patent: 4958228 (1990-09-01), Kutsuki
K. Moulding et al., "Gyrator Video Filter IC with Automatic Tuning", IEEE Journal of Solid-State Circuits, vol. SC-15, No. 6, Dec., 1980.

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