Audio segmentation and classification
US7328149B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2004 |
| Grant date | Feb 5, 2008 |
| Priority date | — |
| Expiry date | Aug 1, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/36
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A portion of an audio signal is separated into multiple frames from which one or more different features are extracted. These different features are used, in combination with a set of rules, to classify the portion of the audio signal into one of multiple different classifications (for example, speech, non-speech, music, environment sound, silence, etc.). In one embodiment, these different features include one or more of line spectrum pairs (LSPs), a noise frame ratio, periodicity of particular bands, spectrum flux features, and energy distribution in one or more of the bands. The line spectrum pairs are also optionally used to segment the audio signal, identifying audio classification changes as well as speaker changes when the audio signal is speech.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.