Method and apparatus for discriminating non-sounds and voiceless sounds of speech signals from each other
US6070135A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1996 |
| Grant date | May 30, 2000 |
| Priority date | — |
| Expiry date | Aug 12, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/93
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for discriminating non-sounds and voiceless sounds of speech signals, recorded on a recording medium, from each other when playing back the speech signals at a varied play-back speed. The method includes the steps of setting, as a reference voltage level, an optional value between a voltage level corresponding to non-sounds and a voltage level corresponding to voiceless sounds, detecting a pitch component of each waveform of the speech signals, comparing the absolute value of a voltage level of the detected pitch component with the reference voltage level, and distinguishing and outputting a portion of the speech signal associated with the detected pitch component based on the result of the comparison. The apparatus includes a waveform splitter for splitting each waveform of the speech signals at a predetermined time interval, a level modulator for modulating the level of each split speech signal waveform to remove a DC component included in the speech signal waveform, a pitch detector for detecting the voltage level of a pitch component of each modulated speech signal waveform, a comparator for comparing the detected voltage level of the pitch component with…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.