Information detecting apparatus and method

Details Information detecting apparatus and method Information detecting apparatus and method

1998-02-24

2000-11-21

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375290, H04L 512, H04L 2549

Patent

active

061513652

ABSTRACT:
It is intended to reduce the rate of occurrence of prediction value judgment errors. Where a prediction value x'.sub.n-1 of a 1-clock preceding code is 0, a judgment circuit 1 outputs a value "1" as a prediction value x'.sub.n if a reproduction signal value y.sub.n sampled at time n is greater than or equal to a threshold value .eta. that is supplied from a threshold value generating circuit 6, and outputs a value "-1" as the prediction value x'.sub.n if y.sub.n <.eta.. Where x'.sub.n-1 is not 0, the judgment circuit 1 outputs a value "0" as the prediction value x'.sub.n. Therefore, the control circuit 1 outputs a value "0" every other clock as a prediction value. During the interval between the first two clocks, the threshold value .eta. is set at 0. Then, when supplied with codes of a given pattern that are arranged at the start, a switch 2 selects the prediction value x'.sub.n that is supplied from the judgment circuit 1. An operation circuit 16 calculates a phase error .DELTA..tau..sub.n from the prediction value x'.sub.n and the sampled value y.sub.n. On the other hand, an operation circuit 17 calculates a level error .DELTA..gamma..sub.n from the prediction value x'.sub.n and the sampled value y.sub.n.

REFERENCES:
patent: 5400364 (1995-03-01), Yada
patent: 5465059 (1995-11-01), Pan et al.
patent: 5799046 (1998-08-01), Hayashi
patent: 5808573 (1998-09-01), Shih et al.
patent: 5835510 (1998-11-01), Hayashi

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