Envelope detection of vestigial sideband TV signals with carrier reinsertion

A model to investigate the envelope detection of vestigial sideband TV signals with nonideal carrier reinsertion is presented. For a typical television test waveform, the amplitude and phase distortions at the output of the envelope detector are calculated as a function of the reinserted carrier amplitude and phase. For given specifications in terms of differential gains and differential phase, the relation between minimum permitted carrier amplitude and maximum permitted carrier phase error is established. This technique permits circuit design without the need for large-scale testing