Mdct m/s stereo

A multi-channel audio encoder for providing an encoded representation of a multi-channel input audio signal,

• wherein the multi-channel audio encoder is configured to apply a real prediction or a complex prediction to a whitened mid-side representation of the multi-channel input audio signal, in order to acquire one or more prediction parameters and a prediction residual signal;
• and
• wherein the multi-channel audio encoder is configured to encode one of the whitened mid signal representation and of the whitened side signal representation, and the one or more prediction parameters and a prediction residual of the real prediction or of the complex prediction, in order to acquire the encoded representation of the multi-channel input audio signal.

A multi-channel audio encoder for providing an encoded representation of a multi-channel input audio signal, wherein the multi-channel audio encoder is configured to determine a number of bits needed for a transparent encoding of a plurality of channels to be encoded, and

• wherein the multi-channel audio encoder is configured to allocate portions of an actually available bit budget for the encoding of the channels to be encoded on the basis of the numbers of bits needed for a transparent encoding of the plurality of channels of the representation selected to be encoded.

A multi-channel audio decoder for providing a decoded representation of a multi-channel audio signal on the basis of an encoded representation,

• wherein the multi-channel audio decoder is configured to derive a mid-side representation of the multi-channel audio signal from the encoded representation;
• wherein the multi-channel audio decoder is configured to apply a spectral de-whitening to the mid-side representation of the multi-channel audio signal, to acquire a dewhitened mid-side representation of the multi-channel input audio signal;
• wherein the multi-channel audio decoder is configured to derive a separate-channel representation of the multi-channel audio signal on the basis of the dewhitened mid-side representation of the multi-channel audio signal.

A method for providing an encoded representation of a multi-channel input audio signal,

• wherein the method comprises applying a spectral whitening to a separate-channel representation of the multi-channel input audio signal, to acquire a whitened separate-channel representation of the multi-channel input audio signal;
• wherein the method comprises applying a spectral whitening to a mid-side representation of the multi-channel input audio signal, to acquire a whitened mid-side representation of the multi-channel input audio signal;
• wherein the method comprises making a decision whether to encode the whitened separate-channel representation of the multi-channel input audio signal, to acquire the encoded representation of the multi-channel input audio signal, or to encode the whitened mid-side representation of the multi-channel input audio signal, to acquire the encoded representation of the multi-channel input audio signal, in dependence on the whitened separate-channel representation and in dependence on the whitened mid-side representation.

A method for providing an encoded representation of a multi-channel input audio signal,

• wherein the method comprises determining numbers of bits needed for a transparent encoding of a plurality of channels to be encoded, and
• wherein the method comprises allocating portions of an actually available bit budget for the encoding of the channels to be encoded on the basis of the numbers of bits needed for a transparent encoding of the plurality of channels of the whitened representation selected to be encoded.

A method for providing a decoded representation of a multi-channel audio signal on the basis of an encoded representation,

• wherein the method comprises deriving a mid-side representation of the multi-channel audio signal from the encoded representation;
• wherein the method comprises applying a spectral de-whitening to the mid-side representation of the multi-channel audio signal, to acquire a dewhitened mid-side representation of the multi-channel input audio signal;
• wherein the method comprises deriving a separate-channel representation of the multi-channel audio signal on the basis of the dewhitened mid-side representation of the multi-channel audio signal.

A non-transitory digital storage medium having a computer program stored thereon to perform the method for providing an encoded representation of a multi-channel input audio signal,

• wherein the method comprises determining numbers of bits needed for a transparent encoding of a plurality of channels to be encoded, and
• wherein the method comprises allocating portions of an actually available bit budget for the encoding of the channels to be encoded on the basis of the numbers of bits needed for a transparent encoding of the plurality of channels of the whitened representation selected to be encoded,
• when said computer program is run by a computer.