Crosstalk Cancellation for Compact Stereo Playback
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Solution Overview
Problem
Conventional stereo playback on computing devices suffers from sound quality degradation due to increased crosstalk signals as the distance between speakers decreases, leading to a loss of spatial information and perceived mono playback, especially in smaller devices.
Innovation Solution
The implementation of an acoustical crosstalk cancellation method using cancellation signals with inverse phase, combined with delay and filtering, to reduce crosstalk and maintain stereo quality, along with listener position tracking to adjust these signals dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between speakers is decreased to make the device smaller, then the device size is reduced, but the stereo playback quality deteriorates due to increased crosstalk
Solution Approach 1:
The system applies preliminary anti-action by generating cancellation signals with inverse phase before the crosstalk reaches the listener's ears. These pre-computed cancellation signals are added to the original audio channels to preemptively counteract the harmful crosstalk effects, allowing small speaker spacing to maintain stereo quality
Solution Approach 2:
The system changes parameters by dynamically adjusting the cancellation signals based on measured crosstalk characteristics. By modifying the phase, amplitude, and timing parameters of the cancellation signals according to the actual speaker configuration and listener position, the system optimizes stereo playback quality for compact device geometries
2Volume of moving object
If the distance between speakers is decreased, then the device size is reduced, but the spatial information is lost leading to perceived mono playback
Solution Approach 1:
The system prevents spatial information loss by preemptively applying crosstalk cancellation that preserves the directional cues in the audio signal. The cancellation signals are designed to remove only the harmful cross-channel leakage while maintaining the integrity of the spatial information in each channel
Solution Approach 2:
The system uses feedback by measuring the actual crosstalk between speakers and using this information to compute appropriate cancellation signals. The crosstalk measurement provides feedback about the speaker configuration and listening environment, which is then used to optimize the cancellation process and preserve spatial information
3Volume of moving object
If conventional stereo playback is used with small speaker spacing, then the device remains compact, but the sound quality decreases due to crosstalk noise and distortion
Solution Approach 1:
The system converts the harmful crosstalk into a benefit by measuring the crosstalk signals and using them to generate cancellation signals. The previously harmful cross-channel leakage is transformed into useful information that enables precise cancellation, turning the device's compact size from a disadvantage into a manageable parameter
Solution Approach 2:
The system applies preliminary anti-action by computing and applying cancellation signals that counteract the crosstalk noise and distortion before they degrade the audio quality. This preemptive cancellation preserves the fidelity of the stereo playback despite the small speaker spacing
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances and maintains stereo playback quality by reducing noise and distortion, even when the distance between speakers is small, and adapts to changes in the listener's position, ensuring an improved audio experience.
Implementation Method 1
an acoustical crosstalk cancellation method using cancellation signals with inverse phase, combined with delay and filtering, to reduce crosstalk
Data Source
AI summary
Systems and methods in accordance with various embodiments of the present disclosure overcome one or more deficiencies in conventional approaches to stereo playback. In particular, various embodiments attempt to cancel or reduce the sound distortion and/or noise from “crosstalk signals” such that stereo effect can be maintained and/or enhanced. In some embodiments, the various embodiments attempt to reduce and/or compensate for the loss of low frequency (bass) sound signals. Moreover, a listener's position, such as his/her head position, can be tracked such that the enhanced stereo playback can be maintained if the listener changes position.