Method and apparatus for data window centering ina multifrequenc

Details Method and apparatus for data window centering ina multifrequenc Method and apparatus for data window centering ina multifrequenc

1986-08-25

1989-05-09

Griffin, Robert L.

Pulse or digital communications

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375 82, 331 1A, 360 51, 328155, H03D 302

Patent

active

048295450

ABSTRACT:
A method for data window centering a multifrequency data separator (12) based on having the frequency of a voltage-controlled oscillator (20) at least twice that of read data window frequency, and setting delay of a delay line (14) used in the data separating process so that arriving raw data pulses will be more accurately assigned to their corresponding windows. The method is realized by providing the multifrequency data separator with a phase comparator emulator (30) and a counter (28). According to another embodiment, the apparatus comprises a counter (28b) combined with a delay setting logic unit (40). The method and apparatus described above result in window centering which does not essentially depend on timing characteristics of circuitry used in the construction of the data separator.

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National Semiconductor DP 8460 Data Separator-Gen'l Description, 12/83, pp. 1-21.
IBM Technical Disclosure Bulletin, v. 21, No. 6, Nov. 1978, p. 2246.

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