Encoder For Encoding A Multi Channel Audio Signal

Abstract: There is described an audio encoder (600) for encoding a multichannel audio signal (602) into a coded signal (632), the multichannel audio signal (602) having a plurality of channels including a first channel and a second channel, the audio encoder comprising: a signal shaping unit (610) configured to shape each channel of the plurality of channels using a number of scale parameters to obtain shaped channels (612), the signal shaping unit (610) being configured to derive, for each channel of the plurality of channels, a number of scale parameters; a stereo processing unit (620) configured to receive the shaped channels (612) and to provide a joint shaped audio signal (622) from the shaped channels (612), a coded signal writer (630), configured to form a coded signal (632) with at least the joint shaped audio signal (622); and a characteristic determiner (640) configured to determine a characteristic (642) from the plurality of channels having a characteristic state selected between at least one first characteristic state and one second characteristic state, the first characteristic state being different from the second characteristic state. The signal shaping unit (610) is configured to be controlled by the characteristic determiner (640) and to derive: in the first characteristic state, for each channel of the plurality of channels, the number of scale parameters using a channel-specific parameter for the channel; and in the second characteristic state, for each channel of the plurality of channels, the number of scale parameters using a joint parameter derived from the first channel and the second channel.

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