Patent ID: 7394499

Claim:
A data transmission method in a digital signal transmission system using a digital display connecting interface, comprising: capturing digital audio data from a video/audio signal source; processing the captured digital audio data to generate transmission audio data; generating a timing signal using a vertical blanking sync signal and a pixel clock for video data, which are obtained from the video/audio signal source, and superimposing the transmission audio data at a predetermined position in a vertical blanking interval of video data that are outputted from the video/audio signal source, in accordance with the generated timing signal; and transmitting the video data on which the transmission audio data are superimposed, the vertical blanking sync signal, and the pixel clock, to a data receiving end, the transmission audio data including a frequency division parameter at a time when an audio clock that is used in reproduction of digital audio data is generated by dividing the frequency of the pixel clock for video data.