Squelch detector
US5303408A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1992 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Apr 3, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/344
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication device (100) having a receiver (106) and an audio output device (116) is provided. The communication device (100) includes a digital signal processor DSP (110) for measuring the level of signal energy in a first segment of the frequency spectrum of the received signal to dynamically establish a squelch threshold. The DSP (110) is also used to measure the level of signal energy in a second segment of the frequency spectrum of the received signal. The communication device (100) also includes audio gates (114). The audio gates (114) provides for the unmuting of the audio output device (116) when the signal energy contained in the second segment of the frequency spectrum of the received signal is below the squelch threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.