Decoder for decoding an encoded audio signal and encoder for encoding an audio signal

Encoder for encoding an audio signal, the encoder comprising:

• an adaptive time-spectrum converter for converting overlapping blocks of time values into successive blocks of spectral values;
• and
• a controller for controlling the adaptive time-spectrum converter to switch between transform kernels of a first group of transform kernels and transform kernels of a second group of transform kernels,
• wherein the adaptive time-spectrum converter is configured to receive a control information and to switch, in response to the control information, between transform kernels of a first group of transform kernels comprising one or more transform kernels comprising different symmetries at sides of a kernel, and a second group of transform kernels comprising one or more transform kernels comprising the same symmetries at sides of a transform kernel.

Method of decoding an encoded audio signal, the method comprising:

• converting successive blocks of spectral values into successive blocks of time values;
• and
• overlapping and adding successive blocks of time values to acquire decoded audio values,
• receiving a control information and switching, in response to the control information and in the converting, between transform kernels of a first group of transform kernels comprising one or more transform kernels comprising different symmetries at sides of a kernel, and a second group of transform kernels comprising one or more transform kernels comprising the same symmetries at sides of a transform kernel.

Method of encoding an audio signal, the method comprising:

• time-spectrum converting overlapping blocks of time values into successive blocks of spectral values;
• and
• controlling the time-spectrum converting to switch between transform kernels of a first group of transform kernels and transform kernels of a second group of transform kernels,
• receiving a control information and switching, in response to the control information and in the time-spectrum converting, between transform kernels of a first group of transform kernels comprising one or more transform kernels comprising different symmetries at sides of a kernel, and a second group of transform kernels comprising one or more transform kernels comprising the same symmetries at sides of a transform kernel.

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

• converting successive blocks of spectral values into successive blocks of time values;
• overlapping and adding successive blocks of time values to acquire decoded audio values;
• and
• receiving a control information and switching, in response to the control information and in the converting, between transform kernels of a first group of transform kernels comprising one or more transform kernels comprising different symmetries at sides of a kernel, and a second group of transform kernels comprising one or more transform kernels comprising the same symmetries at sides of a transform kernel,
• when said computer program is run by a computer.

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

• time-spectrum converting overlapping blocks of time values into successive blocks of spectral values;
• controlling the time-spectrum converting to switch between transform kernels of a first group of transform kernels and transform kernels of a second group of transform kernels;
• and
• receiving a control information and switching, in response to the control information and in the time-spectrum converting, between transform kernels of a first group of transform kernels comprising one or more transform kernels comprising different symmetries at sides of a kernel, and a second group of transform kernels comprising one or more transform kernels comprising the same symmetries at sides of a transform kernel,
• when said computer program is run by a computer.