Method of improving sidetone attenuation in electroacoustic systems
US5467394A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1994 |
| Grant date | Nov 14, 1995 |
| Priority date | — |
| Expiry date | Feb 16, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
To improve the anti-sidetone of electro-acoustic installations, particularly to improve the intercom characteristics of a telecommunication terminal, with compander control by an echo evaluation circuit (52) assigned to the compander (4), the latter has an echo compensator (40) located upstream, and/or a voice-controlled balance (51) is located downstream of the compander (4), which are controlled by the echo evaluation circuit (52) of the compander (4). To control the echo compensator (40) and/or the voice-controlled balance (51), the usual control circuitry required for their operation can be omitted. The result is a particularly effective, economical method with very good intercom characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.