Patent ID: 7092034

Claim:
A video signal processing apparatus for determining whether or not an input video signal is a standard signal, comprising: field ID signal generating means for generating a field ID signal in correspondence with a phase difference between a horizontal sync signal of said video signal and a vertical sync signal of said video signal; first counting means for counting up, in correspondence with an edge of said vertical sync signal, a count value which cycles within a predetermined range; second counting means for counting up, in correspondence with each of both edges of said field ID signal, a count value which cycles within a predetermined range; acquiring means for acquiring the count value of said second counting means in correspondence with an edge of said vertical sync signal when the count value of said first counting means is a first value; and determining means for determining, on the basis of the count value of said second counting means acquired by said acquiring means, whether said video signal is a standard signal or a nonstandard signal.