Patent ID: 6151479
Filing Date: 2000-11-21
Classification: H04H

Abstract:
A method of generating multiple frequencies from a single crystal oscillator in a video and audio satellite transmission system, said satellite transmission system including an uplink transmitter for providing a reference frequency for the encoding of the digital video and audio data stream and a receiver for the decoding of said data stream for display on a television set or monitor, the method comprising the steps of:a) generating a standard reference frequency in the receiver which is substantially the same as used in the uplink transmitter,b) transmitting a synchronization clock pulse in the uplink transmission data and comparing that clock pulse with the standard reference frequency in the receiver;c) processing the differences in the reference frequency to determine adjustment required; andd) adjusting the reference frequency by dividing the reference frequency by predetermined divisors to obtain a desired frequency for decoding the audio data stream to substantially synchronize the frequency of the decoding of the audio data stream in the receiver to that of the uplink transmission.