Patent ID: 8223265

Claim:
A horizontal and vertical synchronization signal generating circuit for generating a horizontal synchronization signal and a vertical synchronization signal, the circuit comprising: a synchronization separation circuit for separating the horizontal synchronization signal and the vertical synchronization signal from a television signal; a horizontal synchronization signal generating circuit for synchronizing an internal clock with the horizontal synchronization signal, separated in the synchronization separation circuit, to generate an internal horizontal synchronization signal based on the internal clock; a normalizing circuit for normalizing timing of the vertical synchronization signal, separated in the synchronization separation circuit, to generate a normalized internal vertical synchronization signal based on the internal horizontal synchronization signal based on the internal clock, wherein times of state change of the normalized internal vertical synchronized signal are synchronized with times of state change of the internal horizontal synchronization signal; and a delay circuit for delaying, by a predetermined period of time, the normalized internal vertical synchronization signal to generate an internal vertical synchronization signal, wherein timing of the generated internal vertical synchronization signal against timing of the generated internal horizontal synchronization signal is shifted by the predetermined period of time, wherein the times of state change of the internal vertical synchronization signal are shifted from the times of state change of the internal horizontal synchronization signal, wherein times of state change of the internal vertical synchronization signal are different from times of state change of the internal horizontal synchronization signal by shifting the internal vertical synchronization from the normalized internal vertical synchronization signal whose times of state change are synchronized with those of the internal horizontal synchronization signal.