Analog voice activity detector for telephone
US6847930B2 · kind B2 · utility
3Cited by
18References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 25, 2002 |
| Grant date | Jan 25, 2005 |
| Priority date | — |
| Expiry date | Jan 27, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Voice activity is detected by comparing an analog signal with two voltage thresholds and producing data representing the energy of the signal. The data, in binary form, is compared with thresholds to determine voice activity. In accordance with another aspect of the invention, the thresholds are adjusted based upon statistical information. In accordance with another aspect of the invention, the data can be weighted to provide an indication of the quasi-RMS energy of an input signal. The input signal itself is not converted into digital form yet the data derived from the input signal has high resolution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.