Voice codec automatic gain control
US6476745B1 · kind B1 · utility
10Cited by
9References
10Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 23, 1999 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Nov 23, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/183
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An Automatic Gain Control System for voice codecs used in a digital wireless handset or in any other environment where there is a large amount of background noise. The invention utilizes the processing power available in Digital Signal Processor 111 to adaptively adjust the gain of amplifier 202 and filter 205 in the transmit channel to eliminate audio distortion in a “loud talker” environment. The gain correction information is transmitted by the DSP 111 to the digital filter and PCM I/O block 204 in the 3 unused bits of the 16 bit PCM data word thus eliminating any additional connections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.