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FM-demodulator-having-a-frequency-independent-delay-circuit

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FM demodulator having a frequency independent delay circuit

Details

Inventors: Koga, Takashi;
Assignee: Kabushiki Kaisha Toshiba (Kanagawa, JP)
Primary Examiner: Grimm; Siegfried H.
Assistant Examiner:
Attorney, Agent or Firm: Finnegan, Henderson, Farabow, Garrett and Dunner

An FM signal demodulator for converting the frequency of an input signal to a corresponding voltage. The demodulator includes a delay circuit responsive to the input signal for delaying the phase of the input signal by a fixed time, an exclusive-OR gate responsive to the input signal and the delayed phase signal from the delay circuit for outputting a pulse signal having a duration corresponding to the fixed time and an LPF responsive to the pulse signal for generating an output signal having a level which changes in response to changes in the frequency of the input signal.

DETAILED DESCRIPTION An object of the present invention is to provide an FM demodulator, employing delay circuits, which has an improved demodulation output response characteristic.
Another object of the present invention is to provide an FM demodulator employing delay circuits in which the delay time of the delay circuits is kept uniform in spite of frequency variations of the input FM signal.
In order to achieve the above object, an FM demodulator employing delay circuits according to one aspect of the present invention includes a delay circuit responsive to the input signal for delaying the phase of the input signal by a fixed time, an exclusive-OR gate responsive to the input signal and the delayed phase signal from the delay circuit for outputting a pulse signal having a duration corresponding to the fixed time and an LPF responsive to the pulse signal for generating an output signal having a level which changes in response to changes in the frequency of the input signal.
Additional objects and advantages of the present invention will be apparent to persons skilled in the art from a study of the following description and the accompanying drawings, which are hereby incorporated in and constitute a part of this specification.

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