Acoustic wave communication apparatus and method
US6011819A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1996 |
| Grant date | Jan 4, 2000 |
| Priority date | — |
| Expiry date | Jul 19, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/1672
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An acoustic communication apparatus includes a microphone/speaker for converting a power voltage and an aerial acoustic wave into an electric signal, and generating an acoustic wave corresponding to the input of data; a signal processing circuit for signal processing the electric signal output from the microphone/speaker in response to the input of the power voltage, the signal being received as data, the circuit outputting data responding thereto to thereby drive the microphone/speaker; a starting signal selection amplifier for always receiving the power voltage during a reception waiting mode, and detecting a starting signal having a predetermined frequency from the electric signal output from the speaker; a non-starting signal selection amplifier for receiving the power voltage in response to the detection of the starting signal, and selectively amplifying only a band excluding the frequency band of the starting signal; and a power voltage supply control circuit for supplying the power voltage to the signal processing circuit when the outputs of the detected starting signal and non-starting signal are maintained at a predetermined state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.