Lost article detector unit with adaptive actuation signal recognition and visual and/or audible locating signal
US5926090A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1997 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | Aug 25, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B21/24
- WIPO fieldControl
- WIPO sectorInstruments
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.