Colour TV phase correction circuit - switches in phase delay components to permit variation in delay and may be controlled by external signals

摘要

The schematic representation is of a circuit for the correction of phase difference errors or distortion in a colour TV signal and includes a high gain amplifier (14) with a feedback device (16). A signal source (18) with a series impedance (20) is connected to the inverting input of the amplifier, together with the feedback device (18). An inductor (24) in series with a resistor (26) is connected between the signal source and earth. A switching device (28) in series with a resistor (30) is also connected to the inductor and to the non-inverting input of the amplifier. Operation of the switching device permits variations in the phase delay to be introduced in the signal path. In practice an electronic switch controlled by external signals would permit dynamic phase correction.