Acoustic transponder receiver circuit
US5008859A · kind A · utility
6Cited by
1References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1988 |
| Grant date | Apr 16, 1991 |
| Priority date | — |
| Expiry date | Dec 7, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/767
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A transponder that responds differently to two different input signals. The first input signal is at a first frequency. The first input signal is detected by a first powered detector that operates at the first frequency. The transponder responses in a first mode to the first input signal. The second input signal consists of short pulses at the first frequency and at a second frequency. The transponder responds to short pulses at the first frequency by powering a second detector. The first and second detectors then detect the second input signal. The transponder responds in a second mode to the second input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.