Frequency activated circuit
US4145660A · kind A · utility
3Cited by
8References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1977 |
| Grant date | Mar 20, 1979 |
| Priority date | — |
| Expiry date | Dec 23, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R23/15
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Frequency-activated channel selector having means to increase and to decrease the lower boundary frequency of a selected channel. When the channel selector couples an input signal to a particular channel, depending on the frequency of the input signal, the lower boundary for that channel is decreased to a lower value. When the frequency of the input signal drops to or below the lower value of the lower boundary, the lower boundary frequency is increased to a higher value. This hysteresis effect eliminates anomalous channel selection behavior when the input frequency is at the channel boundaries.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.