Method, apparatus, and medium for detecting frequency extension coding in the coding history of an audio signal
US9117440B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 30, 2012 |
| Grant date | Aug 25, 2015 |
| Priority date | — |
| Expiry date | Oct 19, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/03
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present document relates to audio forensics, notably the blind detection of traces of parametric audio encoding/decoding. In particular, the present document relates to the detection of parametric frequency extension audio coding, such as spectral band replication (SBR) or spectral extension (SPX), from uncompressed waveforms such as PCM (pulse code modulation) encoded waveforms. A method for detecting frequency extension coding history in a time domain audio signal is described. The method may comprise transforming the time domain audio signal into a frequency domain, thereby generating a plurality of subband signals in a corresponding plurality of subbands comprising low and high frequency subbands; determining a degree of relationship between subband signals in the low frequency subbands and subband signals in the high frequency subbands; wherein the degree of relationship is determined based on the plurality of subband signals; and determining frequency extension coding history if the degree of relationship is greater than a relationship threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.