Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Patent
1993-06-29
1997-07-08
Chin, Wellington
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
375340, 375360, 327 23, 36471511, H04L 700
Patent
active
056469667
ABSTRACT:
A synchronization signal detector for detecting synchronization signals or frame synchronization signals recorded on a recording medium includes a binary-valued signal detector for translating RF signals into binary-valued signals, an edge detection circuit for extracting edge portions of the binary-valued signals, a counter for counting the number of clocks generated by an external source between the edge portions, a number of latch circuits for holding successive clock count values between the edge portions and for successively shifting the clock values held by them, value coincidence circuits for comparing the numbers of clocks between transitions of the synchronization patterns and the clock count values held by the counter and the latch circuits and for outputting a signal indicating a coincidence in case of complete coincidence between the numbers of clocks and the clock count values and an AND circuit for taking a logical sum of the outputs of the value coincidence circuits and the edge detector for producing a detection output of the synchronization signal. The synchronization signal may be detected efficiently with a short delay time and by a simple circuit construction even if the synchronization signal pattern is of a longer length. A demodulator utilizing the synchronization signal detector is also disclosed.
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Patent Abstracts of Japan, vol. 11, No. 70 (E-485) (2517), 3 Mar. 1987 & JP-A-61 225 920 (Toshiba), 7 Oct. 1986.
Chaki Yasuyuki
Ino Hiroyuki
Chin Wellington
Luther William
Sony Corporation
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