Signal detection device and clock recovery device using the same

Details Signal detection device and clock recovery device using the same Signal detection device and clock recovery device using the same

1995-06-09

1997-04-01

Miska, Vit W.

Horology: time measuring systems or devices

Combined with disparate device

368113, 327 48, 327147, 375327, 375375, G04B 4700, H03K 513, H04L 710

Patent

active

056173741

ABSTRACT:
A time window detection portion 3a outputs a time window detection pulse from a time window signal generated in a time window generating portion 2a and a zero-cross detection pulse detected in a zero-cross detection portion 1a. First and second phase storage portions 4a and 5a store output phase values of a phase counter 22 for different times as first and second phase values, respectively. A center phase computing portion 6a computes a first center phase value from the first and second phase values and a center phase storage portion 7a stores the first center phase value of the last time as a second center phase value. An approximation detection portion 8a determines whether the first and second center phase values are approximate or not and outputs an approximation detection pulse when they approximate. A frequency determination portion 20 determines whether a data signal is included in the input signal or not on the basis of frequency of detection of the approximation detection pulse with respect to the zero-cross detection pulse computed in a frequency computing portion 17.

REFERENCES:
patent: 4504960 (1985-03-01), Yamada
patent: 4882546 (1989-01-01), Takamura et al.
patent: 4982110 (1991-01-01), Yokegawa et al.
patent: 5003557 (1991-03-01), Fujiyama
patent: 5260841 (1993-11-01), Suzuki et al.
patent: 5471502 (1995-11-01), Ishizeki
patent: 5528598 (1996-06-01), Baba et al.

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