Apparatus and Method for Audio Signal Coding with Temporal Noise Shaping on Subband Signals

An apparatus for audio signal decoding, wherein the apparatus comprises:

• a decoding unit configured for decoding an audio signal encoding to acquire a decoded spectral-domain audio signal and modification information, wherein the decoded spectral-domain audio signal comprises a plurality of spectral coefficients,
• a first transform unit configured for transforming the decoded spectral-domain audio signal from a spectral domain to a subband signal domain to acquire a subband-signal-domain-transformed audio signal comprising a plurality of subband signals,
• a subband signal modifier configured for acquiring a modified subband-signal-domain audio signal by modifying, depending on the modification information, one or more subband signals of the plurality of subband signals of the subband-signal-domain-transformed audio signal, and
• a second transform unit configured for transforming the modified subband-signal-domain audio signal from the subband signal domain to the spectral domain to acquire a reconstructed spectral-domain audio signal.

An apparatus for audio signal encoding, wherein the apparatus comprises:

• a first transform unit configured for transforming a first spectral-domain audio signal comprising a plurality of spectral coefficients from a spectral domain to a subband signal domain to acquire a subband-signal-domain-transformed audio signal comprising a plurality of subband signals,
• a subband signal modifier configured for modifying one or more subband signals of the plurality of subband signals of the subband-signal-domain-transformed audio signal to acquire a modified subband-signal-domain audio signal,
• a second transform unit configured for transforming the modified subband-signal-domain audio signal from the subband signal domain to the spectral domain to acquire a modified spectral-domain audio signal, and
• an encoding unit configured for generating an audio signal encoding which comprises an encoding of the modified spectral-domain audio signal and modification information or an encoding thereof, wherein the modification information comprises information on how the one or more subband signals have been modified.

A method for audio signal decoding, wherein the method comprises:

• decoding an audio signal encoding to acquire a decoded spectral-domain audio signal and modification information, wherein the decoded spectral-domain audio signal comprises a plurality of spectral coefficients,
• transforming the decoded spectral-domain audio signal from a spectral domain to a subband signal domain to acquire a subband-signal-domain-transformed audio signal comprising a plurality of subband signals,
• acquiring a modified subband-signal-domain audio signal by modifying, depending on the modification information, one or more subband signals of the plurality of subband signals of the subband-signal-domain-transformed audio signal, and
• transforming the modified subband-signal-domain audio signal from the subband signal domain to the spectral domain to acquire a reconstructed spectral-domain audio signal.

A method for audio signal encoding, wherein the method comprises:

• transforming a first spectral-domain audio signal comprising a plurality of spectral coefficients from a spectral domain to a subband signal domain to acquire a subband-signal-domain-transformed audio signal comprising a plurality of subband signals,
• modifying one or more subband signals of the plurality of subband signals of the subband-signal-domain-transformed audio signal to acquire a modified subband-signal-domain audio signal,
• transforming the modified subband-signal-domain audio signal from the subband signal domain to the spectral domain to acquire a modified spectral-domain audio signal, and
• generating an audio signal encoding which comprises an encoding of the modified spectral-domain audio signal and modification information or an encoding thereof, wherein the modification information comprises information on how the one or more subband signals have been modified.