Radio channel squelching systems
US5970399A · kind A · utility
11Cited by
18References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1995 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Nov 22, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/344
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Detection of in-band noise in a radio communications voice channel is provided by mixing a signal having a known frequency into a radio signal containing a voice channel signal in an in-band range, thereby translating the voice channel signal out of the in-band range. The in-band range is thereafter examined for the presence of noise signal energy whose presence can be indicative of in-band noise. Squelching of the voice channel is provided in the event that in-band noise energy exceeds a predetermined threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.