Patent ID: 6014176
Filing Date: 2000-01-11
Classification: G09G,H04N

Abstract:
A video display system comprising:a. a receiving circuit configured for receiving an analog input composite video signal having a first phase and a first frequency, and a digital input composite video signal having a second phase and a second frequency;b. a transmitting circuit configured for outputting an output composite video signal representing a predetermined ratio of the analog input composite video signal and the digital input composite video signal; andc. an automatic phase and frequency correction circuit coupled to the receiving circuit and to the transmitting circuit for monitoring the first phase, the second phase, the first frequency and the second frequency and ensuring that the second phase and the second frequency are equal to the first phase and the first frequency, wherein the analog input composite video signal is a master signal and is not adjusted and the digital input composite video signal is a slave signal and is adjusted so that the second phase equals the first phase and the second frequency equals the first frequency.