Feature-based audio content identification
US6604072B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 2001 |
| Grant date | Aug 5, 2003 |
| Priority date | — |
| Expiry date | Mar 19, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/10546
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An audio signal is sampled and a frequency transform is performed on a succession of sets of samples of the signal to obtain a time dependent power spectrum for the audio signal. Frequency components output by the frequency transform are collected in frequency bands. More than one running average is taken of each semitone frequency band. When the values of two running averages of the same semitone frequency band cross, time information is recorded. Information about average crossing events that have occurred at different times in a set of adjacent semitone frequency bands is combined to form a key. A set of keys obtained from a song provides a means for identifying the song and is stored in a database for use in identifying songs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.