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

Claim 27:
28. A non-transitory digital storage medium having stored thereon a computer program for performing, when running on a computer, 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, the method 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 the second audio signal portion encoded in the time domain; 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,
wherein the first encoding comprises:
converting the first audio signal portion into a frequency domain representation;
analyzing the frequency domain representation to determine first spectral portions to be encoded with a first spectral resolution and second spectral portions to be encoded with a second spectral resolution, the second spectral resolution being lower than the first spectral resolution, wherein the analyzing comprises determining a first spectral portion from the first spectral portions, the first spectral portion being placed, with respect to frequency, between two second spectral portions from the second spectral portions; and
encoding the first spectral portions with the first spectral resolution and encoding the second spectral portions with the second spectral resolution, wherein the encoding comprises calculating spectral envelope information comprising the second spectral resolution from the second spectral portions.