| (19) |
 |
|
(11) |
EP 4 303 871 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
20.03.2024 Bulletin 2024/12 |
| (43) |
Date of publication A2: |
|
10.01.2024 Bulletin 2024/02 |
| (22) |
Date of filing: 28.01.2019 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
|
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL
NO PL PT RO RS SE SI SK SM TR |
| (30) |
Priority: |
26.01.2018 EP 18153683
|
| (62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
|
22189216.9 / 4120261 |
|
22181854.5 / 4099325 |
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21164481.0 / 3872809 |
|
19153875.0 / 3518233 |
| (71) |
Applicant: Dolby International AB |
|
Dublin, D02 VK60 (IE) |
|
| (72) |
Inventors: |
|
- KJOERLING, Kristofer
113 30 Stockholm (SE)
- VILLEMOES, Lars
113 30 Stockholm (SE)
- PURNHAGEN, Heiko
113 30 Stockholm (SE)
- EKSTRAND, Per
113 30 Stockholm (SE)
|
| (74) |
Representative: AWA Sweden AB |
|
Box 5117
200 71 Malmö
200 71 Malmö (SE) |
|
| |
|
| (54) |
BACKWARD-COMPATIBLE INTEGRATION OF HIGH FREQUENCY RECONSTRUCTION TECHNIQUES FOR AUDIO
SIGNALS |
(57) A method for decoding an encoded audio bitstream is disclosed. The method includes
receiving the encoded audio bitstream and decoding the audio data to generate a decoded
lowband audio signal. The method further includes extracting high frequency reconstruction
metadata and filtering the decoded lowband audio signal with an analysis filterbank
to generate a filtered lowband audio signal. The method also includes extracting a
flag indicating whether either spectral translation or harmonic transposition is to
be performed on the audio data and regenerating a highband portion of the audio signal
using the filtered lowband audio signal and the high frequency reconstruction metadata
in accordance with the flag.