Single clock 27 MHZ oscillator in MPEG-2 system

Details Single clock 27 MHZ oscillator in MPEG-2 system Single clock 27 MHZ oscillator in MPEG-2 system

1997-06-03

2000-11-21

Faile, Andrew I.

Telecommunications

Wireless distribution system

455 71, 455258, 455259, 348 6, 348 7, 348423, 348521, 331 25, 327115, 327117, H04H 100

Patent

active

061514799

ABSTRACT:
This invention provides a method of generating multiple frequencies for use in a digital data transmission system including a remote transmitter and receiver. The reference frequency used in the transmitter is replicated in a remote receiver. A single crystal oscillator is used to generate a reference frequency similar to that used in the transmitter. The receiver reference frequency is manipulated by dividing the frequency into required multiple frequencies for use within the receiver. A constant comparison is made between the clock signal received in the transmitted data stream with the receiver reference frequency and the divisors are adjusted accordingly to maintain the clock frequency in the receiver within a predetermined tolerance range. This allows the output signal for display from the receiver to match the quality of the input display provided to the transmitter.

REFERENCES:
patent: 4163946 (1979-08-01), Alberts
patent: 4540945 (1985-09-01), Kuroki
patent: 4698678 (1987-10-01), Collins
patent: 5493710 (1996-02-01), Takahara et al.
patent: 5703537 (1997-12-01), Bland et al.
patent: 5825254 (1998-10-01), Lee
van der Waal et al., Current and future standardization of high-quality digital audio coding in MPEG, Application of Signal Processing to Audio and Acoustics, IEEE 1993. Whole document, 1993.

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