Binaural Decoder Gain Correction for HRTF Upmix Energy Errors
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Solution Overview
Problem
Existing methods for generating binaural signals from multi-channel audio face challenges in energy conservation and spectral coloring due to non-energy-conserving upmixing rules, especially when using HRTF filters, leading to artifacts in binaural decoding.
Innovation Solution
A multi-channel decoder that calculates a gain factor to correct energy errors in binaural signal generation by using upmix rule information and HRTF filter characteristics, allowing for energy-corrected binaural signal production without fully rendering the multi-channel signal, thereby reducing spectral coloring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-energy-conserving upmixing rules are used for binaural decoding, then computational efficiency is improved and audio quality is enhanced, but energy errors occur leading to spectral coloring artifacts
Solution Approach 1:
The patent applies preliminary action by pre-calculating gain factors based on HRTF filter characteristics and upmixing parameters before actual binaural decoding. This allows the system to prepare energy correction data in advance, enabling efficient real-time processing while preventing spectral coloring artifacts from occurring during playback.
Solution Approach 2:
The patent changes parameters by introducing gain factors that are derived from HRTF filter characteristics and upmixing parameters. These gain factors dynamically adjust the energy distribution in the binaural signal, correcting energy errors introduced by non-energy-conserving upmixing rules without requiring full energy conservation.
2Device complexity
If HRTF filters are combined using non-energy-conserving upmixing rules, then binaural signal generation is simplified, but energy errors are introduced that degrade audio quality
Solution Approach 1:
The patent introduces gain factors as an intermediary element between the HRTF filters and the binaural output signal. These gain factors act as mediators that correct energy errors introduced by non-energy-conserving upmixing rules, allowing the system to maintain simplified filter combination while preserving audio quality.
3Measurement precision
If prediction parameters are used for waveform matching in upmixing, then time domain accuracy is improved, but energy conservation is compromised resulting in energy loss
Solution Approach 1:
The patent applies feedback by using HRTF filter characteristics and upmixing parameters to calculate gain factors that compensate for energy loss. The system continuously adjusts these gain factors based on the relationship between prediction parameters and HRTF filters, ensuring that waveform matching accuracy is maintained while correcting energy conservation issues.
Data Source
AI summary
A multi-channel decoder for generating a binaural signal from a downmix signal using upmix rule information on an energy-error introducing upmix rule for calculating a gain factor based on the upmix rule information and characteristics of head related transfer function based filters corresponding to upmix channels. The one or more gain factors are used by a filter processor for filtering the downmix signal so that an energy corrected binaural signal having a left binaural channel and a right binaural channel is obtained.