Patent ID: 7268820
Filing Date: 2007-09-11
Classification: H04N

Abstract:
1. A video signal conversion apparatus wherein an input video signal is converted into a progressive video signal of predetermined frame rate, comprising: a film source discrimination unit which discriminates whether or not the input video signal is a video signal of film source as based on a film; an interlace/progressive conversion unit which, when the input video signal is an interlaced video signal, converts the input video signal into the progressive video signal by a conversion method conforming to a result of the discrimination by said film source discrimination unit and then outputs the progressive video signal, and which, when the input video signal is not the interlaced video signal, outputs the video signal as it is; a frame rate conversion unit which converts the output video signal of said interlace/progressive conversion unit into a video signal of higher frame rate in accordance with the result of the discrimination by said film source discrimination unit; an input signal discrimination unit which discriminates a sort and a signal supply source of the input video signal; an operation mode setting unit which sets operation modes of individual sorts of video signals of each of a plurality of signal supply sources; and a control unit which obtains from said operation mode setting unit, the operation mode corresponding to the sort and the signal supply source of the input video signal as discriminated by said input signal discrimination unit, and which controls an operation of at least one said film source discrimination unit, said interlace/progressive conversion unit and said frame rate conversion unit in accordance with the obtained operation mode, wherein said input signal discrimination unit includes a synchronizing-signal detection unit which detects a vertical synchronizing signal of the input video signal, said interlace/progressive conversion unit outputs the progressive video signal in synchronism with the vertical synchronizing signal of the input video signal, and wherein when the vertical synchronizing frequency of the input video signal is 50Hz, said interlace/progressive conversion unit repeats forming the progressive video signal corresponding to one frame, out of 2 fields of the input video signal, so as to output the progressive video signal twice in succession; and when the vertical synchronizing frequency of the input video signal is 60Hz, said interlace/progressive conversion unit repeats forming the progressive video signal corresponding to one frame, out of initial 2 fields of 5 fields of the input video signal, so as to output the progressive video signal twice in succession, forming the progressive video signal corresponding to one frame, out of 2 subsequent fields, so as to output the progressive video signal twice in succession, and neglecting one remaining field.