Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1983-04-22
1986-03-18
Groody, James J.
Facsimile and static presentation processing
Facsimile
Recording apparatus
455308, 307555, 328162, 358167, H04N 591, H04N 5213, H03B 1900, H03B 100, H04B 110
Patent
active
045772380
ABSTRACT:
An intermodulation distortion reducing circuit for a frequency-modulated signal comprises a sinusoidal wave shaping circuit supplied with an input frequency-modulated signal including an intermodulation distortion component, for shaping the waveform of the input frequency-modulated signal into a waveform closely approximating a sinusoidal wave, and a mean DC level detecting circuit supplied with an output signal of the sinusoidal wave shaping circuit, for detecting a mean DC level of the output signal of the sinusoidal wave shaping circuit and producing a detection output. The sinusoidal wave shaping circuit is supplied with the detection output of the mean DC level detecting circuit and a waveform shaping quantity thereof is varied to obtain the waveform closely approximating the sinusoidal waveform. The sinusoidal wave shaping circuit produces a frequency-modulated signal having a waveform closely approximating a sinusoidal waveform, with its intermodulation distortion component reduced.
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Dunnam Michael P.
Groody James J.
Victor Company of Japan Ltd.
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