Sidetone level reduction circuit and method
US5852774A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 3, 1996 |
| Grant date | Dec 22, 1998 |
| Priority date | — |
| Expiry date | Sep 3, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/585
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A sidetone level reduction circuit for reducing the sidetone level in digital cordless telephones incorporating continuously variable slope delta modulator/demodulator (CVSD) digital to analog technology is disclosed comprising a CVSD encoder for converting an analog voice signal to a digital signal, a CVSD decoder for converting a digital signal to an analog signal voice signal, and coupling means connecting the coincidence output of the CVSD encoder and the coincidence output of the CVSD decoder in a manner such that the coincidence output of the CVSD decoder can affect the CVSD encoder but the CVSD encoder cannot affect the CVSD decoder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.