Dolby International AB (20240271217). OVERSAMPLING IN A COMBINED TRANSPOSER FILTERBANK simplified abstract
Contents
OVERSAMPLING IN A COMBINED TRANSPOSER FILTERBANK
Organization Name
Inventor(s)
Lars Villemoes of Jarfalla (SE)
Per Ekstrand of Saltsjobaden (SE)
OVERSAMPLING IN A COMBINED TRANSPOSER FILTERBANK - A simplified explanation of the abstract
This abstract first appeared for US patent application 20240271217 titled 'OVERSAMPLING IN A COMBINED TRANSPOSER FILTERBANK
The present invention involves coding of audio signals, specifically high frequency reconstruction methods with a frequency domain harmonic transposer.
- Analysis filter bank with an analysis transformation unit and analysis window to provide analysis subband signals from the low frequency component of the signal
- Nonlinear processing unit to determine synthesis subband signals based on a portion of the analysis subband signals phase-shifted by a transposition order
- Synthesis filter bank with a synthesis transformation unit and synthesis window to generate the high frequency component of the signal from the synthesis subband signals
- Frequency resolution factor q selected based on the product of frequency resolution f and duration d of the analysis filter bank
- Q is smaller than the transposition order t and greater than 1
Potential Applications: - Audio signal processing - Music production - Speech recognition technology
Problems Solved: - Enhancing high frequency components of audio signals - Improving audio quality and clarity - Efficient coding and decoding of audio data
Benefits: - Enhanced audio listening experience - Improved speech recognition accuracy - Efficient data compression for audio files
Commercial Applications: Title: High-Frequency Reconstruction Technology for Audio Signals Description: This technology can be used in audio equipment manufacturing, telecommunications, and digital audio processing industries. It can improve the quality of audio playback devices and enhance speech recognition systems, leading to better user experiences and increased market competitiveness.
Questions about High-Frequency Reconstruction Technology: 1. How does the frequency domain harmonic transposer improve audio signal processing? 2. What are the potential benefits of using this technology in music production?
Original Abstract Submitted
the present invention relates to coding of audio signals, and in particular to high frequency reconstruction methods including a frequency domain harmonic transposer. a system and 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 () comprising an analysis transformation unit () having a frequency resolution of �f; and an analysis window () having a duration of d; the analysis filter bank () being configured to provide a set of analysis subband signals from the low frequency component of the signal; a nonlinear processing unit () configured to determine a set of synthesis subband signals based on a portion of the set of analysis subband signals, wherein the portion of the set of analysis subband signals is phase shifted by a transposition order t; and a synthesis filter bank () comprising a synthesis transformation unit () having a frequency resolution of q�f; and a synthesis window () having a duration of d; the synthesis filter bank () being configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein q is a frequency resolution factor with q≥1 and smaller than the transposition order t; and wherein the value of the product of the frequency resolution �f and the duration dof the analysis filter bank is selected based on the frequency resolution factor q.
