Audio Device Crosstalk Cancellation Using Signal Segmentation
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Solution Overview
Problem
Conventional audio devices using speakers for virtual acoustic image localization suffer from sound quality deterioration, particularly with center-localized components and low frequency components, due to cross-talk cancellation processing that causes echoes and attenuates low frequencies.
Innovation Solution
An audio device is configured with signal processing means that extracts anti-phase and in-phase component signals using specific transfer characteristics to cancel crosstalk, and adds these signals in a manner that inverts or maintains their phases to eliminate crosstalk without degrading sound quality, using adders and signal processing sections to generate driving signals for speakers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cross-talk cancellation processing is carried out using conventional methods, then crosstalk is suppressed and binaural signals are provided accurately to both ears, but sound quality deteriorates because center-localized components are perceived to be pulled back and low frequency components are weakened
Solution Approach 1:
The audio signal is segmented into in-phase component signals and anti-phase component signals. The in-phase components (dominant in center-localized sounds and low frequencies) are processed separately from the anti-phase components. This segmentation allows selective processing where cross-talk cancellation is applied only to anti-phase components, while in-phase components are preserved, thereby maintaining sound quality while achieving accurate binaural signal delivery.
Solution Approach 2:
Different processing qualities are applied to different components of the audio signal. The in-phase component signals are output without cross-talk cancellation processing to preserve sound quality, while the anti-phase component signals undergo cross-talk cancellation processing to eliminate crosstalk. This local differentiation of processing quality resolves the contradiction between crosstalk suppression and sound quality maintenance.
2Reliability
If cross-talk cancellation processing is applied to eliminate crosstalk in speaker reproduction, then accurate binaural signals are provided to ears, but center-localized components and low frequency components are attenuated
Solution Approach 1:
The audio signal is divided into in-phase and anti-phase components. Since low frequency components are predominantly in-phase, they are extracted and output without cross-talk cancellation processing, preserving their intensity. Only the anti-phase components undergo cross-talk cancellation, ensuring accurate acoustic image localization while maintaining low frequency component intensity.
Solution Approach 2:
Selective processing is applied where cross-talk cancellation is performed only on anti-phase components and not on in-phase components. This local quality differentiation ensures that low frequency components (which are mostly in-phase) are not attenuated, while still achieving reliable acoustic image localization through cross-talk cancellation of the anti-phase components.
Data Source
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AI summary
A signal processing section 3 is set up which provides an anti-phase component signal S extracted by an anti-phase component extracting section 2 with a transfer characteristic (Hd + Hx) / (Hd - Hx); an adder 4 adds the phase-inverted signal of the anti-phase component signal S provided with the transfer characteristic by the signal processing section 3 and an in-phase component signal M extracted by an in-phase component extracting section 1; and an adder 5 adds the anti-phase component signal S provided with the transfer characteristic by the signal processing section 3 and the in-phase component signal M extracted by the in-phase component extracting section 1.