Crosstalk Cancellation Filter Design via Frequency-Dependent Regularization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing binaural audio playback through loudspeakers suffers from crosstalk, which corrupts head-related transfer function (HRTF) and interaural cues, leading to incomplete 3D soundfield reproduction due to spectral coloration, dynamic range loss, and limited frequency range effectiveness in current crosstalk cancellation (XTC) techniques.
Innovation Solution
A method and system for calculating a frequency-dependent regularization parameter to design XTC filters that result in a flat amplitude vs frequency response at the loudspeakers, forcing XTC to occur only in the phase domain, thus avoiding spectral coloration and dynamic range loss, and achieving optimal crosstalk cancellation across the audio band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional XTC filter design methods are used to achieve crosstalk cancellation, then crosstalk is reduced, but spectral coloration is introduced to the sound
Solution Approach 1:
The patent changes the parameter being optimized from amplitude response at the listener's ears to amplitude response at the loudspeakers. By applying frequency-dependent regularization to flatten the amplitude response at the loudspeaker level rather than at the ear level, the method achieves crosstalk cancellation through phase adjustments only, avoiding the spectral coloration that results from amplitude modifications at the ear level.
2Object-affected harmful factors
If conventional XTC filter design methods are used to achieve crosstalk cancellation, then crosstalk is reduced, but dynamic range loss occurs
Solution Approach 1:
The patent shifts the optimization parameter from ear-level amplitude response to loudspeaker-level amplitude response. This parameter change causes the XTC filter to operate purely in the phase domain at the listener's ears, eliminating the amplitude modifications that cause dynamic range loss while maintaining effective crosstalk cancellation.
3Object-affected harmful factors
If conventional XTC filter design methods are used, then some level of crosstalk cancellation is achieved, but effectiveness is limited to certain frequency ranges
Solution Approach 1:
The patent employs frequency-dependent regularization that adapts the regularization parameter across different frequencies. By optimizing the amplitude response at the loudspeakers across the entire audio spectrum rather than at specific frequencies, the method achieves broad frequency range effectiveness for crosstalk cancellation.
Data Source
AI summary
A method and system for calculating the frequency-dependent regularization parameter (FDRP) used in inverting the analytically derived or experimentally measured system transfer matrix for designing and/or producing crosstalk cancellation (XTC) filters relies on calculating the FDRP that results in a flat amplitude vs frequency response at the loudspeakers, thus forcing XTC to be effected into the phase domain only and relieving the XTC filter from the drawbacks of audible spectral coloration and dynamic range loss. When the method and system are used with any effective optimization technique, it results in XTC filters that yield optimal XTC levels over any desired portion of the audio band, impose no spectral coloration on the processed sound beyond the spectral coloration inherent in the playback hardware and/or loudspeakers, and cause no (or arbitrarily low) dynamic range loss.