Patent ID: 8115871
Filing Date: 2012-02-14
Classification: H03L,H04N

Abstract:
1. An apparatus including a signal generator for use in producing a video top-of-frame signal based upon an input video signal with an input video frame including one or more input video fields and having an input video frame rate for an output video signal with an output video frame having a plurality of output video frame lines, each with a plurality of output video pixels, and an output video frame rate, comprising: gating circuitry responsive to input vertical and horizontal reference signals by providing a gated signal, wherein said input vertical reference signal is related to a vertical video synchronization signal for said input video signal, said input horizontal reference signal is related to a horizontal video synchronization signal for said input video signal, and said gated signal represents said input video frame; first counter circuitry coupled to said gating circuitry and responsive to said gated signal, first count control data and a first reset signal by providing a first count signal, wherein said first count control data is related to a ratio of said input and output video frame rates; second counter circuitry coupled to said first counter circuitry and responsive to said first count signal, second count control data and said input horizontal reference signal by providing a second count signal, wherein said second count control data is related to a predetermined line of said output video frame; and third counter circuitry coupled to said second counter circuitry and responsive to an input reference clock signal related to said input horizontal video synchronization signal, third count control data and said second count signal by providing a third count signal, wherein said third count control data is related to a reference plurality of video frame lines for a reference video frame having a reference video frame rate, and said third count signal is related to said output video frame rate.