Audio Signal Discriminator and Coder
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsErik Norvell, Volodya Grancharov
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Abstract
The invention relates to a codec and a discriminator and methods therein for audio signal discrimination and coding. Embodiments of a method performed by an encoder comprises, for a segment of the audio signal: identifying a set of spectral peaks; determining a mean distance S between peaks in the set; and determining a ratio, PNR, between a peak envelope and a noise floor envelope. The method further comprises selecting a coding mode, out of a plurality of coding modes, based at least on the mean distance S and the ratio PNR; and applying the selected coding mode for coding of the segment of the audio signal.
Claims16
-16. (canceled)
A method for audio signal classification, the method comprising:
- for a segment of an audio signal:
- identifying a set of spectral peaks;
- determining a mean distance S between peaks in the set;
- determining a ratio, PNR, between a peak envelope energy and a noise floor envelope energy;
- determining to which class of audio signals, out of a plurality of audio signal classes, the segment, belongs, based on at least the mean distance S and the ratio PNR.
An audio signal classifier, configured to:
- for a segment of an audio signal:
- identify a set of spectral peaks;
- determine a mean distance S between peaks in the set;
- determine a ratio, PNR, between a peak envelope energy and a noise floor envelope energy;
- determine to which class of audio signals, out of a plurality of audio signal classes, that the segment belongs, based on at least the mean distance S and the ratio PNR.
Dependencies are inferred from the claim text.