Phase coherence control for harmonic signals in perceptual audio codecs
AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsSascha DISCH, Juergen HERRE, Bernd EDLER, Frederik NAGEL
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Abstract
A decoder for decoding an encoded audio signal to obtain a phase-adjusted audio signal is provided. The decoder has a decoding unit and a phase adjustment unit. The decoding unit is adapted to decode the encoded audio signal to obtain a decoded audio signal. The phase adjustment unit is adapted to adjust the decoded audio signal to obtain the phase-adjusted audio signal. The phase adjustment unit is configured to receive control information depending on a vertical phase coherence of the encoded audio signal. Moreover, the phase adjustment unit is adapted to adjust the decoded audio signal based on the control information.
Claims21
A decoder for decoding an encoded audio signal to acquire a phase-adjusted audio signal, comprising:
- a decoding unit;
- for decoding the encoded audio signal to acquire a decoded audio signal, and
- a phase adjustment unit for adjusting the decoded audio signal to acquire the phase-adjusted audio signal,
- wherein the phase adjustment unit is configured to receive control information depending on a vertical phase coherence of the encoded audio signal, and
- wherein the phase adjustment unit is adapted to adjust the decoded audio signal based on the control information.
An encoder for encoding control information based on an audio input signal, comprising:
- a transformation unit for transforming the audio input signal from a time-domain to a spectral domain to acquire a transformed audio signal comprising a plurality of subband signals being assigned to a plurality of subbands,
- a control information generator for generating the control information such that the control information indicates a vertical phase coherence of the transformed audio signal, and
- an encoding unit for encoding the transformed audio signal and the control information.
An apparatus for processing a first audio signal to acquire an second audio signal, comprising:
- a control information generator for generating control information such that the control information indicates a vertical phase coherence of the first audio signal, and
- a phase adjustment unit for adjusting the first audio signal to acquire the second audio signal,
- wherein the phase adjustment unit is adapted to adjust the first audio signal based on the control information.
A method for decoding an encoded audio signal to acquire a phase-adjusted audio signal, comprising:
- receiving control information, wherein the control information indicates a vertical phase coherence of the encoded audio signal,
- decoding the encoded audio signal to acquire a decoded audio signal, and
- adjusting the decoded audio signal to acquire the phase-adjusted audio signal based on the control information.
A method for encoding control information based on an audio input signal, comprising:
- transforming the audio input signal from a time-domain to a spectral domain to acquire a transformed audio signal comprising a plurality of subband signals being assigned to a plurality of subbands,
- generating the control information such that the control information indicates a vertical phase coherence of the transformed audio signal, and
- encoding the transformed audio signal and the control information.
A method for processing a first audio signal to acquire an second audio signal, comprising:
- generating control information such that the control information indicates a vertical phase coherence of the first audio signal, and
- adjusting the first audio signal based on the control information to acquire the second audio signal.
Dependencies are inferred from the claim text.