Lost article detector unit with adaptive actuation signal recognition and visual and/or audible locating signal
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United States of America Patent
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Jul 20, 1999
Issued Date -
N/A
app pub date -
Aug 25, 1997
filing date -
Aug 26, 1996
priority date (Note) -
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Abstract
A lost article detector unit includes a microprocessor programmed to execute adaptive actuation signal recognition that discerns desired activation sounds from noise. Preferably the desired activation sounds include a sequence of four adjacent spaced-apart hand claps made by the same user. A transducer provides amplified sound signals to the microprocessor, which then analyzes and stores pattern information associated with the first clap-pair. Signals from a second clap-pair are then analyzed and compared with stored pattern information from the first clap-pair, using the algorithm. The adaptive use of such pattern information permits imposing timing tolerances that are sufficiently tight to reduce false triggering, without requiring the user to memorize a rigid sequence pattern of clapping. Upon microprocessor-recognition of desired activation sounds, the microprocessor causes the transducer to provide a locating signal that may be visual and/or audible. Audible locating signals may include synthesized human speech (in more than one language and/or voice), songs, music, among other signals. The activation signal permits a user to locate the detector unit and small objects attached thereto.
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