Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-05-24
1992-06-02
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
329316, 329336, H04N 5455
Patent
active
051191997
ABSTRACT:
An imput for receiving FM modulated video signals is connected to a first demodulator circuit, the output of which is connected to the first input of an adder. The input is also connected to a transversal filter, the output of which feeds a Hilbert transform circuit that has its output connected to a second demodulator circuit. The output of the second demodulator is connected to a second input of the adder, the adder providing an FM demodulated video signal with reduced moire and improved signal-to-noise ratio. In a second embodiment, the Hilbert transform circuit is formed by delay circuits and a subtraction circuit connected to subtract the output of the delay circuits from the input thereto. An adder is connected to add the output of the delay circuits to the input thereto. First and second demodulation circuits receive the outputs from the subtractor and adder, respectively, and the outputs of the first and second demodulation circuits are mixed to produce the FM demodulated video signal.
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Groody James J.
Murrell Jeffrey S.
Sony Corporation
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