Pulse or digital communications – Receivers – Automatic baseline or threshold adjustment
Patent
1993-06-30
1997-03-04
Tse, Young T.
Pulse or digital communications
Receivers
Automatic baseline or threshold adjustment
375334, 329319, 329320, H04L 2506
Patent
active
056087624
ABSTRACT:
A portion of a FSK signal is encoded with a central frequency (f.sub.0) and the FSK signal is transmitted. A receiver captures the transmitted FSK signal, and demodulates the FSK signal to provide and analog data signal. The analog data signal is DC coupled to a first input of a comparator. The comparator generates a logic level binary output corresponding to the FSK signal. A second input of the comparator is coupled to a bias circuit. Preferably the bias circuit is provided by a digital to analog convertor (DAC). A control circuit detects the predetermined portion of the FSK signal in which the center of frequency is being transmitted. During the predetermined portion the control circuit samples the binary logic level output of the comparator, converts the binary logic level output to a digital error word, and uses the digital error word to control the DAC.
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patent: 5001726 (1991-03-01), Kawai
patent: 5027352 (1991-06-01), Goode
patent: 5052021 (1991-09-01), Goto
patent: 5175749 (1992-12-01), Ficht
SpectraLink Corporation
Tse Young T.
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