Lost article detector unit with adaptive actuation signal recogn

Details Lost article detector unit with adaptive actuation signal recogn Lost article detector unit with adaptive actuation signal recogn

1996-08-26

1997-10-14

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340573, 340571, 34082536, 34082549, 34082572, 367198, 367199, G08B 1314

Patent

active

056776756

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 audibly beep an activation sound. The activation sound permits a user to locate the detector unit and small objects attached thereto.

REFERENCES:
patent: 4135146 (1979-01-01), Krupp
patent: 4507653 (1985-03-01), Bayer
patent: 5054007 (1991-10-01), McDonough
patent: 5209695 (1993-05-01), Rothschild
patent: 5488273 (1996-01-01), Chang

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