Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1990-08-10
1991-10-15
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
455296, 364723, H04B 110
Patent
active
050581392
ABSTRACT:
In a receiver for receiving an information signal including digital information samples which are contaminated with an interference component having known frequency characteristics, a filter is provided having a signal generator responsive to at least a portion of the received signal for generating an output signal having the frequency characteristics of the interference component and an amplitude and phase controlled by the portion of the received signal. A combiner combines the generator output signal with the received signal for generating a filtered output signal having the interference component substantially removed therefrom, which is then applied to an interpolator. In response to the identification of incorrect digital information samples in the received signal, control of the generator by that portion of the received digital information signal which contains the samples identified as incorrect is disabled. In this manner the generator "free-runs" during the receipt of incorrect samples, thereby allowing it to continue to provide samples representative of the known characteristics of the interference component until correct samples are again received.
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"Digital Filters for ECG Signals", David W. Mortara, Ph. D., Marquette Electronics Incorporated, pp. 511-514.
"Digital Filters for Real-Time ECG Signal Processing Using Microprocessors", Ahlstrom et al., IEEE Transactions on Biomedical Engineering, vol. BME-32, No. 9, Sep. 1985, pp. 709-713.
Chin Stephen
Edelman Lawrence C.
Siemens Medical Electronics, Inc.
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