Cross product enhanced harmonic transposition
HK40134623APending Publication Date: 2026-07-10DOLBY INTERNATIONAL AB
Patent Information
- Authority / Receiving Office
- HK · HK
- Patent Type
- Applications
- Current Assignee / Owner
- DOLBY INTERNATIONAL AB
- Filing Date
- 2026-05-21
- Publication Date
- 2026-07-10
AI Technical Summary
Technical Problem
Existing harmonic transposition methods in audio coding systems suffer from artifacts such as 'ghost' pitches and metallic sounds, especially for signals with prominent periodic structures, and require complex computational processes to avoid these issues.
Method used
A method and system that utilize a nonlinear combination of multiple analysis subbands to generate high frequency components by modifying their phases and combining them, using a cross product enhancement with a pitch parameter, to create a complete harmonic series.
Benefits of technology
This approach effectively reduces artifacts and improves audio quality by generating a full harmonic series, enhancing the reconstruction of high frequency components without degrading complex music material.
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Smart Images
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Abstract
The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR). A system and a method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank providing a plurality of analysis subband signals of the low frequency component of the signal. It also comprises a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by modifying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-modified analysis subband signals. Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.
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