Patent ID: 11929084
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 21:
22. A method of encoding an audio signal, the audio signal comprising a first audio signal portion and a timely subsequent second audio signal portion having an audio sampling rate, to generate an encoded audio signal, comprising:
first encoding the first audio signal portion in a frequency domain to obtain a first encoded signal portion;
second encoding the second audio signal portion in a time domain to obtain a second encoded signal portion, the second audio signal portion comprising a low band and a high band;
analyzing a portion of the audio signal and determining that the portion of the audio signal is either the first audio signal portion encoded in the frequency domain or is the second audio signal portion encoded in the time domain;
calculating, from an encoded spectral representation of the first audio signal portion, initialization data of the second encoding, so that the second encoding is initialized to encode the second audio signal portion immediately following the first audio signal portion in time in the audio signal, wherein the calculating comprises calculating a decoded version of the first encoded signal portion, and feeding a delayed version of the decoded version of the first encoded signal portion into a de-emphasis step of the second encoding for an initialization; and
forming the encoded audio signal comprising the first encoded signal portion for the first audio signal portion and the second encoded signal portion for the second audio signal portion.