Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1997-01-24
1998-06-30
Ghebretinsae, Temesghen
Pulse or digital communications
Receivers
Interference or noise reduction
455296, H04B 110
Patent
active
057745064
ABSTRACT:
A data receiving apparatus is disclosed, which comprises: a receiving circuit (51) for receiving a transmission signal including a channel of quadrature signals and generating an IF signal (1) from the received transmission signal; a BPF for extracting the channel of quadrature components from the IF signal; a quadrature detection circuit (4) for effecting a quadrature-detection to the IF signal from the BPF and generating quadrature signals; a digital root nyquist filter (6) for effecting digital-root-nyquist-filtering to the quadrature signals from the quadrature detection circuit with a coefficient; and a coefficient prediction circuit (8) responsive to the quadrature signals from the digital root nyquist filter for predicting the coefficient and supplying the coefficient to the digital root nyquist filter. A memory circuit comprising EEPROM may be provided. Prediction may be done in response to a manual operation or detecting a deterioration in the quality of the output quadrature signals. The coefficient prediction circuit may comprise a real number type FIR filter or complex number of FIR filter and subtractors for comparing with a reference signal.
REFERENCES:
patent: 5263018 (1993-11-01), Christopher
patent: 5648989 (1997-07-01), Ko
Ghebretinsae Temesghen
Matsushita Electric - Industrial Co., Ltd.
LandOfFree
Data receiving apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Data receiving apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data receiving apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1868219