System and method for reducing quantization noise
US6069921A · kind A · utility
2Cited by
7References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1997 |
| Grant date | May 30, 2000 |
| Priority date | — |
| Expiry date | Oct 3, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B14/046
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system and method for reducing quantizing noise is presented. In some Internet access and other dial-up services, modems or other sources connect into analog switching systems, and then are A/D-converted to reach remote switching offices. There, the digitized signal is converted back to analog, only to be re-digitized for T1 transmission. In the invention, the sample points used to re-digitize the signal are synchronized with those used to originally sample the signal, nearly eliminating second quantization noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.