IMPROVED BLOCK-BASED HARMONIC SUB-BAND TRANSPOSITION
Patent Information
- Application Number
- DE602011075287
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2011-01-05
- Publication Date
- 2025-04-02
- Estimated Expiration
- 2031-01-05
AI Technical Summary
Existing harmonic transposition based high frequency reconstruction (HFR) methods have high computational complexity, which hinders their efficiency while maintaining good audio quality, especially for transient and voiced signals.
The use of subband block based harmonic transposition with block based nonlinear processing, which allows for reduced computational complexity by employing a coarse frequency resolution filterbank and lower oversampling, while maintaining audio quality through signal adaptive modifications and efficient implementation of multiple transposition orders within a single filterbank pair.
This approach reduces computational complexity while achieving audio quality comparable to high-quality sample based harmonic transposition for stationary signals, with improvements for transient signals through signal adaptive processing, and allows for efficient processing of multiple transposition orders using a single filterbank pair.