Voice detection
US5450484A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1993 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | Mar 1, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/78
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Voice detector for detecting whether a telephone signal has been produced by a voice. The voice detector obtains, on a per frame basis, measures of the following quantities relating to the telephone signal: total energy; energy and frequency of two largest energy peaks in a frequency spectrum; and signal-to-noise ratio (SNR). If the measure of total energy exceeds a predetermined threshold, the voice detector increments running sums of the following measures: total energy; frequency of the largest peak in the frequency spectrum; and SNR. Until a predetermined number of frames, referred to as a window, has been reached, for each frame, the voice detector determines whether the telephone signal was produced by ringing (incrementing a ring count if it was) and whether there is a local energy maximum (incrementing a local energy maximum count if there was). When the window is reached, the voice detector determines whether, during the window, the telephone signal was produced by ringback (updating adaptive, signal-to-noise and energy parameters if it was). If the telephone signal was not produced by ringback, the voice detector determines whether the telephone signal was produced by a v…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.