Digital data detector

Details Digital data detector Digital data detector

1994-06-28

1996-01-30

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375371, 341122, 327 91, H03D 100

Patent

active

054886368

ABSTRACT:
A digital data detector samples a signal at twice the data rate and calculates a phase interval from a zero crossing point to the current sampling point. The phase of the current sampling point is predicted based on the phase of a sampling point located before the current sampling point, the phase of a sampling point located at least two points before the current sampling point, and a zero crossing detection signal. A predicted error is calculated between a calculated phase interval and a predicted current phase. The frequency band of the predicted error is limited, and the phase of the current sampling point is calculated according to the band-limited predicted error, the predicted current phase, and the zero crossing detection signal. A data detection clock is detected in synchronization with a received digital data according to the calculated phase of each sampling point. A digital data value is detected using the phase interval, the calculated current phase, and sampling data. The predicted error is band-limited, and the phase of the current sampling point is calculated to follow only fluctuation due to wow and flutter in a relatively low frequency band. Since a clock signal is detected for data detection according to the calculated phase, digital data can be detected with a small data error rate even from received digital data having a low signal to noise ratio.

REFERENCES:
patent: 4792964 (1988-12-01), Yoshida
patent: 4910517 (1990-03-01), Takeuchi et al.
patent: 5355392 (1994-10-01), Takeuchi et al.

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