TRANSMITTING AND RECEIVING METHOD FOR GHUST ELEMINDTING REFERENCE SIGNAL

摘要

The system comprises a device (15) for generating a digital signal and a device (12) for superposing the digital signal on a television signal in a vertical blanking interval. A transmission device (13) transmits the television signal containing the superposed digital signal. The ghost cancelling device (14) eliminates group-delay distortion frequency amplitude characteristic distortion and ghost generated in the transmission device. The ghost cancelling device uses the digital signal superposed on the TV signal as a reference signal. The digital signal contains information needed for transmitting data and is a random or pseudorandom signal. The digital signal is composed of frame synchronising signals, clock synchronising signals and data signals.