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Noise-detecting-circuit-having-noise-immune-AGC

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Noise detecting circuit having noise-immune AGC

Details

Inventors: Amazawa, Kiyoshi; Mori, Masaharu;
Assignee: Clarion Co., Ltd. (Tokyo, JP)
Primary Examiner: Martin; John C.
Assistant Examiner:
Attorney, Agent or Firm: Wallenstein, Spangenberg, Hattis & Strampel

In an audio reproducing system including mixer means, intermediate frequency transformer means, first gate means and audio reproducing means following said first gate means, a noise detecting circuit comprising detector means for detecting a high frequency component of the output signal of said mixer means; amplifier means for amplifying a signal having said high frequency component from said detector means; pulse generator means for producing a pulse in response to a noise component in the output of said amplifier means; automatic gain control means for controlling the gain of said amplifier means, second gate means provided between said automatic gain control means and said amplifier means; and means for applying said pulse to said first and second gate means to operate them to thereby prevent application of said noise component to said audio reproducing means.

DETAILED DESCRIPTION The invention provides a highly sensitive noise detecting circuit that is capable of detecting not only a relatively high level of pulse-shaped noise but a low level of pulse-shaped noise as well.
The invention also preferably provides an extremely high sensitive noise detecting circuit that assures detection of a noise signal regardless of the level of an incoming frequency modulated signal.

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