Method and apparatus for echo canceling accounting for companding induced quantization error
US5790632A · kind A · utility
30Cited by
13References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 21, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | May 21, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/23
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An improved method and apparatus for canceling echo is disclosed. The echo canceller of the present invention compensates for the existence of quantization error in the echo signal that does not exist in the reference signal by introducing the quantization effects into the reference signal. The quantization effects are typically companding quantization errors caused by the A-law and .mu.-law quantizers prevalent in digital communications equipment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.