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Police radar warning receiver with mute function

  • US 4,631,542 A
  • Filed: 09/28/1984
  • Issued: 12/23/1986
  • Est. Priority Date: 09/28/1984
  • Status: Expired due to Term
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Petitions
46
Forward Citations
19
Assignments
First Claim
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1. A vehicle-mounted police radar warning receiver having an alarm indicator to indicate the presence of a police radar signal, said receiver adapted to allow de-energization of the alarm indicator during a first alarm signal while not preventing energization of the alarm indicator in response to a subsequent second alarm signal occurring more than a predetermined time after the first alarm signal terminates, said receiver comprising:

  • an alarm indicator;

    alarm signal generator means for detecting the presence of a police radar signal and for generating an alarm signal during an interval in which said police radar signal is detected and for generating a no-alarm signal in the absence of said police radar signal being detected;

    mute means for generating a mute signal;

    electronic switch means responsive to said alarm signal generator means and said mute means for energizing and de-energizing said alarm indicator, said electronic switch means comprising;

    first switch means having an ON state and an OFF state for energizing said alarm indicator only in said first switch means ON state;

    second switch means having an output coupled to said first switch means, said second switch means output having an enable state and a disable state, for causing said first switch means to be in said ON state in response to said enable state and said alarm signal and for causing said first switch means to be in said OFF state in response to said disable state; and

    timer means being responsive to said alarm generator means for generating an allow signal between onset of said alarm signal and a predetermined time after said alarm signal ceases;

    said second switch means being responsive to said mute means and said timer means, said second switch means initially being in said enable state and thereafter being switchable to said disable state in response to said mute signal being generated while said allow signal is being generated whereby said alarm indicator is de-energized;

    said second switch means remaining in said disable state until said allow signal ceases and thereafter switching to said enable state whereby generation of a second said alarm signal will not cause said alarm indicator to be energized unless said second alarm signal is generated said predetermined time after a first said alarm signal ceases.

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  • 19 Assignments
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