H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 7/033 (2006.01)
Patent
CA 2151682
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. A mean phase computing portion 18 computes a mean phase value from the first center phase value, and a phase correction portion 19 computes a correction phase value from the output phase value of the phase counter 22. A setting portion 21 sets one of the mean phase value, a steady phase value and the correction phase value as an initial phase in the phase counter 22 in accor- dance with the result of determination by the frequency determination portion 20. A clock generating portion 23 generates clocks on the basis of the output phase value of the phase counter 22.
Ohmi Shinichiro
Takai Hitoshi
Urabe Yoshio
Gowling Lafleur Henderson Llp
Matsushita Electric Industrial Co. Ltd.
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