Apparatus and method for processing an audio signal to obtain a processed audio signal using a target time-domain envelope

A method of audio decoding, comprising:

• the method for processing an audio signal to acquire a processed audio signal, comprising:
• calculating phase values for spectral values of a sequence of frequency-domain frames representing overlapping frames of the audio signal,
• wherein the phase values are calculated based on information on a target time-domain envelope related to the processed audio signal, so that the processed audio signal comprises at least in an approximation the target time-domain envelope and a spectral envelope determined by the sequence of frequency-domain frames;
• receiving an encoded signal, the encoded signal comprising a representation of the sequence of frequency-domain frames, and a representation of the target time-domain envelope.

A method of audio source separation, comprising:

• the method for processing an audio signal to acquire a processed audio signal, comprising:
• calculating phase values for spectral values of a sequence of frequency-domain frames representing overlapping frames of the audio signal,
• wherein the phase values are calculated based on information on a target time-domain envelope related to the processed audio signal, so that the processed audio signal comprises at least in an approximation the target time-domain envelope and a spectral envelope determined by the sequence of frequency-domain frames, and
• masking a spectrum of an original audio signal to acquire a modified audio signal input into the apparatus for processing;
• wherein the processed audio signal is a separated source signal related to the target time-domain envelope.

A method of bandwidth enhancement of an encoded audio signal, comprising:

• generating an enhancement signal from an audio signal band comprised by the encoded signal;
• the method for processing an audio signal to acquire a processed audio signal, comprising:
• calculating phase values for spectral values of a sequence of frequency-domain frames representing overlapping frames of the audio signal,
• wherein the phase values are calculated based on information on a target time-domain envelope related to the processed audio signal, so that the processed audio signal comprises at least in an approximation the target time-domain envelope and a spectral envelope determined by the sequence of frequency-domain frames;
• wherein the generating comprises extracting the target time-domain envelope from an encoded representation comprised by the encoded signal or from the audio signal band comprised by the encoded signal.

A non-transitory digital storage medium having a computer program stored thereon to perform a method of audio decoding, the method comprising:

• the method for processing an audio signal to acquire a processed audio signal, comprising:
• calculating phase values for spectral values of a sequence of frequency-domain frames representing overlapping frames of the audio signal,
• wherein the phase values are calculated based on information on a target time-domain envelope related to the processed audio signal, so that the processed audio signal comprises at least in an approximation the target time-domain envelope and a spectral envelope determined by the sequence of frequency-domain frames;
• receiving an encoded signal, the encoded signal comprising a representation of the sequence of frequency-domain frames, and a representation of the target time-domain envelope,
• when said computer program is run by a computer.

A non-transitory digital storage medium having a computer program stored thereon to perform a method of audio source separation, the method comprising:

• the method for processing an audio signal to acquire a processed audio signal, comprising:
• calculating phase values for spectral values of a sequence of frequency-domain frames representing overlapping frames of the audio signal,
• wherein the phase values are calculated based on information on a target time-domain envelope related to the processed audio signal, so that the processed audio signal comprises at least in an approximation the target time-domain envelope and a spectral envelope determined by the sequence of frequency-domain frames, and
• masking a spectrum of an original audio signal to acquire a modified audio signal input into the apparatus for processing;
• wherein the processed audio signal is a separated source signal related to the target time-domain envelope,
• when said computer program is run by a computer.

A non-transitory digital storage medium having a computer program stored thereon to perform a method of bandwidth enhancement of an encoded audio signal, the method comprising:

• generating an enhancement signal from an audio signal band comprised by the encoded signal;
• the method for processing an audio signal to acquire a processed audio signal, comprising:
• calculating phase values for spectral values of a sequence of frequency-domain frames representing overlapping frames of the audio signal,
• wherein the phase values are calculated based on information on a target time-domain envelope related to the processed audio signal, so that the processed audio signal comprises at least in an approximation the target time-domain envelope and a spectral envelope determined by the sequence of frequency-domain frames;
• wherein the generating comprises extracting the target time-domain envelope from an encoded representation comprised by the encoded signal or from the audio signal band comprised by the encoded signal,
• when said computer program is run by a computer.