Method and apparatus for improving the apparent accuracy of a da

Details Method and apparatus for improving the apparent accuracy of a da Method and apparatus for improving the apparent accuracy of a da

1994-02-02

1996-11-26

Coles, Sr., Edward L.

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

375376, H04L 700, H03D 324

Patent

active

055793487

ABSTRACT:
The apparent accuracy of a clock circuit used to recover timing and transmitted information signals in a data receiver is improved. A timing relationship inherent in a received signal is detected prior to the acquisition of a timing component embedded in a desired information portion of the received signal. The timing relationship has an accuracy that is greater than the accuracy of the clock circuit. The clock circuit is controlled in response to the timing relationship to operate with an improved range of accuracy. Thereafter, the embedded timing component is acquired and used to control the clock circuit. In an illustrated embodiment, the timing relationship is derived from a symbol rate of the received signal. In an alternate embodiment, the timing relationship is obtained from a separate transmitted reference signal, such as a transmitted television signal.

REFERENCES:
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patent: 3819853 (1974-06-01), Stein
patent: 4017803 (1977-04-01), Baker
patent: 4077016 (1978-02-01), Sanders et al.
patent: 4633193 (1986-12-01), Scordo
patent: 4642573 (1987-02-01), Noda et al.
patent: 4893319 (1990-01-01), Ziuchkovski
patent: 5184091 (1993-02-01), Srivastava
patent: 5231486 (1993-07-01), Acampora et al.
patent: 5241382 (1993-08-01), Paike
patent: 5276716 (1994-01-01), Wincn

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