Digital and analogue input signal processing circuit for television signals

摘要

The circuit allows handling of both digital and analogue input signals (ES) using switches (S1,S2) operated manually and/or automatically in response to the input signals, to alter the configuration of a voltage-controlled oscillator (VCO). Pref. the switches allow the voltage-controlled oscillator to be connected to a filter (F) and a comparator (K), or to be connected to an external signal provided by a quartz accuracy phase-regulating loop.