DOLBY INTERNATIONAL AB (20240257790). EFFICIENT COMBINED HARMONIC TRANSPOSITION simplified abstract
Contents
EFFICIENT COMBINED HARMONIC TRANSPOSITION
Organization Name
Inventor(s)
Per Ekstrand of Saltsjobaden (SE)
Lars Villemoes of Järfälla (SE)
EFFICIENT COMBINED HARMONIC TRANSPOSITION - A simplified explanation of the abstract
This abstract first appeared for US patent application 20240257790 titled 'EFFICIENT COMBINED HARMONIC TRANSPOSITION
The present document discusses audio coding systems utilizing a harmonic transposition method for high frequency reconstruction and digital effect processors like exciters that add brightness to the signal through harmonic distortion.
- Analysis filter bank provides analysis subband signals from the low frequency component with a frequency resolution of f.
- Nonlinear processing unit determines synthesis subband signals from analysis subband signals using a transposition order p.
- Synthesis filter bank generates the high frequency component from synthesis subband signals with a frequency resolution of f, where p is different from f.
- Potential Applications:**
- Audio processing in music production - Enhancing sound quality in telecommunications - Improving speech recognition systems
- Problems Solved:**
- Efficient high frequency reconstruction - Enhancing audio signals without distortion - Providing a natural and bright sound to processed signals
- Benefits:**
- Improved audio quality - Enhanced user experience - Versatile applications in various industries
- Commercial Applications:**
- Title: Innovative Audio Processing Technology for Enhanced Sound Quality*
This technology can be used in: - Music production studios - Telecommunications companies - Speech recognition software developers
- Questions about Audio Coding Systems:**
1. How does the harmonic transposition method improve high frequency reconstruction in audio coding systems? 2. What are the key differences between traditional audio processing methods and the system described in the patent application?
Original Abstract Submitted
the present document relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (hfr), and to digital effect processors, e.g. so-called exciters, where generation of harmonic distortion adds brightness to the processed signal. in particular, a system configured to generate a high frequency component of a signal from a low frequency component of the signal is described. the system may comprise an analysis filter bank () configured to provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals; wherein the analysis filter bank () has a frequency resolution of �f. the system further comprises a nonlinear processing unit () configured to determine a set of synthesis subband signals from the set of analysis subband signals using a transposition order p; wherein the set of synthesis subband signals comprises a portion of the set of analysis subband signals phase shifted by an amount derived from the transposition order p; and a synthesis filter bank () configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein the synthesis filter bank () has a frequency resolution of f�f; with f being a resolution factor, with f≥1; wherein the transposition order p is different from the resolution factor f.
