Speech communication apparatus equipped with echo canceller
US5400399A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1993 |
| Grant date | Mar 21, 1995 |
| Priority date | — |
| Expiry date | Feb 26, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A speech communication apparatus of the present invention includes, in addition to an echo canceller for canceling an acoustic echo generated in a hands-free speech space, a chirp signal generating unit and a training unit. The chirp signal generating unit generates a chirp signal adequate for initial training of the echo canceller. The training control unit enables the chirp signal generating unit to generate a chirp signal, when a predetermined condition for starting hands-free speaking is satisfied, and a chirp tone corresponding to the chirp signal to be output as a volume-amplified tone from the hands-free speaker. The echo canceller performs initial training of the echo canceller based on the chirp tone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.