Digital video transmission

A system for supplying a digital video signal from a source of digital video to a sink of digital video, wherein the digital video signal includes digital video data for three different colours and a pixel clock signal, the system comprising:

• a transmitter connectable to a source of digital video;
• a receiver connectable to a sink of digital video;
• and
• a cable connectable to the transmitter and the receiver and including at least three twisted wire pairs, wherein the transmitter and receiver include between them circuitry configured to
• receive the digital video data and the pixel clock signal at a transmitter;
• measure the frequency of the pixel clock signal at the transmitter;
• send a signal representative of the frequency of the pixel clock signal over a cable connecting the transmitter and a receiver, wherein said signal representative of the frequency of the pixel clock signal is representative of the value of the frequency of the pixel clock signal measured at the transmitter;
• send digital video data for three different colours over three different twisted wire pairs of the cable from the transmitter to the receiver;
• generate a local pixel clock signal at the receiver using the signal representative of the frequency of the pixel clock signal;
• use the local pixel clock signal to process the received digital video data sent over the three different twisted wire pairs by identifying data bit boundaries in the received digital video data to generate a recovered pixel clock signal at the receiver;
• and
• output from the receiver the digital video data and the recovered pixel clock signal that was generated at the receiver.

A system for supplying a digital video signal from a source of digital video to a sink of digital video, wherein the digital video signal includes digital video data for three different colours and a pixel clock signal, the system comprising:

• a transmitter connectable to a source of digital video;
• and a receiver connectable to a sink of digital video, wherein:
• the transmitter includes:
• an input for receiving digital video from the source of digital video;
• an output connectable to a cable for connecting the transmitter to a receiver;
• circuitry to measure the frequency of the pixel clock signal at the transmitter and send a signal representative of the value of the measured frequency of the pixel clock signal measured at the transmitter to the output for transmission over the cable;
• and
• circuitry to send digital video data for three different colours to the output for transmission over three different twisted wire pairs of the cable, and wherein the receiver includes:
• an input connectable to a cable for connecting the receiver to a transmitter;
• circuitry to receive digital video data for three different colours from the input which has been transmitted over three different twisted wire pairs of the cable;
• circuitry to generate a local pixel clock signal using said signal representative of the value of the measured frequency of the pixel clock signal received over the cable;
• circuitry to process received digital video data by identifying data bit boundaries in the received digital video data using the local pixel clock to generate a recovered pixel clock signal at the receiver;
• and
• an output for passing the digital video data and the recovered pixel clock signal to the sink of digital video.