| 摘要 |
A ghost detection and cancellation system is provided in which the horizontal sync pulses of a first sequence of lines in the vertical retrace interval are used as training signals for the detection and verification of the presence of a ghost signal. This detection procedure results in the development of a signal which reliably indicates the time location of the ghost signal with respect to the main television signal. The location indication signal is then used to select the appropriate tap of a tapped delay line. The delayed video signal from the tapped delay line is then applied to the control amplifier of a ghost canceller for the generation of a pseudo-ghost signal during a subsequent line or lines of the vertical retrace interval. The pseudo-ghost signal is combined with the original video signal to cancel its ghost signal component. By sequentially performing ghost detection and cancellation during numerous lines of the same vertical retrace interval, ghost detection and cancellation is quickly and accurately achieved. |
