Apparatus and method for decoding and encoding an audio signal using adaptive spectral tile selection

A method of decoding an encoded audio signal to obtain a decoded audio signal, the method comprising:

• decoding an encoded representation of a first set of first spectral portions to acquire a decoded first set of first spectral portions of the encoded audio signal;
• decoding an encoded parametric representation of a second set of second spectral portions to acquire a decoded parametric representation;
• and
• regenerating a target frequency tile using a source region from the decoded first set of first spectral portions, wherein the decoded audio signal comprises the target frequency tile,
• wherein the regenerating comprises applying a whitening filter to the source region identified, wherein the applying the whitening filter comprises calculating a spectral envelope estimate of the source region and dividing a spectrum of the source region by a spectral envelope indicated by the spectral envelope estimate.

A non-transitory digital storage medium having a computer program stored thereon to perform, when said computer program is run by a computer, a method of decoding an encoded audio signal to obtain a decoded audio signal, the method comprising:

• decoding an encoded representation of a first set of first spectral portions of the encoded audio signal to acquire a decoded first set of first spectral portions;
• decoding an encoded parametric representation of a second set of second spectral portions to acquire a decoded parametric representation;
• and
• regenerating a target frequency tile using a source region from the decoded first set of first spectral portions, wherein the decoded audio signal comprises the target frequency tile,
• wherein the regenerating comprises applying a whitening filter to the source region, wherein the applying the whitening filter comprises calculating a spectral envelope estimate of the source region and dividing a spectrum of the source region by a spectral envelope indicated by the spectral envelope estimate.