Auto-tuning circuit for an active filter used in video...

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

H - Electricity

04

N

350/57

H04N 9/12 (2006.01) H03J 7/02 (2006.01) H04N 9/64 (2006.01) H04N 9/78 (2006.01)

Patent

CA 2026345

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 trans- fer 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 tel- evision signal.

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