Method and apparatus for detecting speech at a near-end of a communications system, a speaker-phone system, or the like
US6141415A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 1996 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Oct 11, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and communication system (10), which can be used in a full, pseudo full, or half duplex speaker-phone system, includes a circuit (14) to remove a frequency component from a received signal to output a modified received signal, and a speaker (18) to convert the modified received signal to an acoustic signal (20). The circuit (14) may be, for example, a notch filter, which may remove a sharp frequency range between about 1250 Hz and 1550 Hz. A microphone (26) converts a second acoustic signal (24) to an electrical signal for transmitting, and a detector (30) produces a detector output if the removed frequency is present in the acoustic signal (24). A circuit (34) is also provided to modify a circuit parameter applied to the received signal when the detector (30) produces a detector output. The parameter may be, for instance an attenuation applied to the received signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.