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Circuit-for-reducing-intermodulation-distortion-in-a-frequency-modulated-signal

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Circuit for reducing intermodulation distortion in a frequency-modulated signal

Details

Inventors: Watanabe, Yasuaki;
Assignee: Victor Company of Japan, Ltd. (Yokohama, JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:

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.

DETAILED DESCRIPTION Accordingly, it is a general object of the present invention to provide a novel and useful intermodulation distortion reducing circuit for reducing intermodulation distortion in a frequency-modulated signal, in which the intermodulation distortion in the frequency-modulated signal can be positively reduced.
Another and more specific object of the present invention is to provide an intermodulation distortion reducing circuit for reducing intermodulation distortion in a frequency-modulated signal, which clips a frequency-modulated signal including intermodulation distortion, so that the duty cycle of the frequency-modulated signal with respect to a mean DC level becomes approximately equal to 50%, in order to carry out wave-shaping to obtain a substantially sinusoidal wave and reduce and eliminate the intermodulation distortion.
According to the circuit of the present invention, the intermodulation distortion in the frequency-modulated signal can be positively eliminated.
Hence, in a case where the frequency-modulated signal is a signal obtained by frequency-modulating a carrier by a multiplexed signal which is obtained by multiplexing a color video signal and a frequency-modulated audio signal, it is possible to prevent the introduction of beat interference between the two signals, and it is therefore possible to obtain a reproduced picture of superior picture quality and reproduced sound of superior sound quality.
Other objects and further features of the present invention will be apparent from the following detailed description when read in conjunction with the accompanying drawings.

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