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Method and apparatus for activating switches in response to different acoustic signals

  • US 5,493,618 A
  • Filed: 05/07/1993
  • Issued: 02/20/1996
  • Est. Priority Date: 05/07/1993
  • Status: Expired due to Term
First Claim
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1. An acoustic switch comprising:

  • a microphone for producing electrical signals corresponding to a series of received acoustic signals;

    a filter coupled to an output of said microphone for producing a filtered acoustic signal from said electrical signals, said filtered acoustic signal comprising only components within a predetermined frequency range;

    a first power switch having its operation responsive to an assertion of a first switch signal;

    a second power switch having its operation responsive to an assertion of a second switch signal;

    a master control device with an input to receive said filtered acoustic signal, a first output for carrying said first switch signal coupled to said first power switch, a second output for carrying said second switch signal coupled to said second power switch, said master control device recognizing a first series of acoustic signals and a second series of acoustic signals different from said first series of acoustic signals and asserting said first switch signal upon recognition of said first series of acoustic signals and asserting said second switch signal upon recognition of said second series of acoustic signals; and

    a mode selector, coupled to said master control device, for selecting one of two operating modes of the acoustic switch, said operating modes including a normal mode and an away mode.

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