Abstract: An arrangement is provided for developing timed clock signals for a digital baseband television signal processing system. An AFPC loop circuit is responsive to the color burst signal component of a received analog video signal for producing a continuous wave signal which is aligned in frequency and phase with the color burst signal. The continuous wave signal is applied to a tint control circuit, which is responsive to a control signal, for variably shifting the phase of the continuous wave signal. The phase-shifted continuous wave signal is then applied to a phase-locked loop circuit, which produces a sampling signal for an analog-to-digital converter at a frequency which is a multiple of the color subcarrier frequency and with a phase which will result in a reproduced image of a desired tint or hue. In one embodiment of the present invention, the continuous wave signal is phase-shifted by a series of logic gates having a plurality of output taps.

Abstract: A television signal ghost detector is provided which acquires a component of a ghost signal when one is present, after which the ghost signal component is tracked, thereby providing a continuous indication of the presence of the ghost signal and its delay with respect to the main television signal. In the television receiver, a training signal contained within the received television signal is applied to a variable delay line. When the television signal is contaminated by a ghost signal, the training signal will be followed by a ghost of itself. When the delay of the variable delay line is correct, the delayed training signal at the output of the delay line will be in time coincidence with the training signal ghost at the input of the delay line. A coincidence detector detects this condition, after which time the delay of the delay line is controlled to maintain the coincident condition during subsequent receptions of the training signal.

Abstract: A television ghost cancellation system is provided which includes a delay line having an input coupled to receive video signals which include a training signal component. The delay line provides a delay to the video signals which is substantially equal to the delay of the ghost of the training signal with respect to the training signal when a ghost signal is present. This delay causes a delayed training signal to appear at the output of the delay line at the same time that its ghost is applied to the input of the delay line. The delayed signal at the output of the delay line is applied to a control amplifier, which is coupled in a feedback loop with an amplitude comparator and a sample-and-hold circuit. The amplitude comparator compares the delayed training signal with the ghost at the input of the delay line and produces an error signal indicative of the amplitude differences between the two signals.