Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Patent
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.
Takeuchi Hitoshi
Yamada Eiji
Chin Stephen
Sharp Kabushiki Kaisha
Webster Bryan
LandOfFree
Digital data detector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital data detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital data detector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-161263