Audio encoder and decoder using a frequency domain processor, a time domain processor, and a cross processing for continuous initialization

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

• decoding a first encoded audio signal portion in a frequency domain to obtain a decoded spectral representation of the first encoded audio signal portion, wherein the decoding the first encoded audio signal portion comprises
• reconstructing a first set of first spectral portions in a waveform-preserving manner to generate a spectrum comprising a first set of reconstructed first spectral portions and at least one gap between two reconstructed first spectral portions of the first set of reconstructed first spectral portions,
• filing at least one gap between the two reconstructed first spectral portions of the first set of reconstructed first spectral portions in the spectrum using a frequency regeneration technique, the frequency regeneration technique comprising applying parametric data to one or more reconstructed first spectral portions of the first set of reconstructed first spectral portions to obtain the decoded spectral representation of the first encoded audio signal portion, and
• converting the decoded spectral representation of the first encoded audio signal portion into a time domain to acquire a decoded first audio signal portion,
• decoding a second encoded audio signal portion in the time domain to acquire a decoded second audio signal portion;
• calculating, from the decoded spectral representation of the first encoded audio signal portion, initialization data for the step of decoding the second encoded audio signal portion;
• initializing the step of decoding the second encoded audio signal portion using the initialization data to decode the second encoded audio signal portion following in time the first encoded audio signal portion in the encoded audio signal;
• and
• combining the decoded first audio signal portion and the decoded second audio signal portion to acquire the decoded audio signal.

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

• decoding a first encoded audio signal portion in a frequency domain to obtain a decoded spectral representation of the first encoded audio signal portion, wherein the decoding the first encoded audio signal portion comprises
• reconstructing a first set of first spectral portions in a waveform-preserving manner to generate a spectrum comprising a first set of reconstructed first spectral portions and at least one gap between two reconstructed first spectral portions of the first set of reconstructed first spectral portions,
• filing the at least one gap between the two reconstructed first spectral portions of the first set of reconstructed first spectral portions in the spectrum using a frequency regeneration technique, the frequency regeneration technique comprising applying parametric data to one or more reconstructed first spectral portions of the first set of reconstructed first spectral portions to obtain the decoded spectral representation of the first encoded audio signal portion, and
• converting the decoded spectral representation into a time domain to acquire a decoded first audio signal portion;
• decoding a second encoded audio signal portion in the time domain to acquire a decoded second audio signal portion;
• calculating, from the decoded spectral representation of the first encoded audio signal portion, initialization data for the step of decoding the second encoded audio signal portion;
• initializing the step of decoding the second encoded audio signal portion using the initialization data to decode the second encoded audio signal portion following in time the first encoded audio signal portion in the encoded audio signal;
• and
• combining the decoded first audio signal portion and the decoded second audio signal portion to acquire the decoded audio signal.