Multiband Audio Tuning with Selective Crosstalk Cancellation
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Solution Overview
Problem
Conventional audio playback systems face challenges in effectively reducing crosstalk across the entire frequency range of an audio signal, leading to distortion and harsh sound quality due to inadequate crosstalk cancellation techniques, particularly at low and high frequencies.
Innovation Solution
The system separates the audio signal into multiple frequency bands, applying specific filters and delays to each band to minimize crosstalk, using sensor data to adjust filter settings based on listener position and orientation, ensuring accurate sound reproduction without spectral distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If crosstalk cancellation is applied to the entire frequency range, then crosstalk reduction is achieved, but distortion and harsh sound quality occur due to inadequate handling of low and high frequencies
Solution Approach 1:
The audio signal is divided into multiple frequency bands (low frequency, mid frequency, high frequency) so that each band can be processed with appropriate filters. This segmentation allows the system to apply crosstalk cancellation selectively where it is most effective while avoiding distortion in other bands.
Solution Approach 2:
Different filter characteristics are applied to different frequency bands based on their specific properties. Low frequency components receive different processing than mid or high frequency components, allowing each band to be optimized for its particular acoustic characteristics and crosstalk behavior.
2Object-affected harmful factors
If conventional crosstalk cancellation techniques are applied to low-frequency portions, then directional information is lost, but applying cancellation results in distortion and degraded listening experience
Solution Approach 1:
The frequency spectrum is segmented into distinct bands, allowing the system to identify which bands have sufficient directional information for effective crosstalk cancellation. Low-frequency components that lack directional information are excluded from cancellation processing.
Solution Approach 2:
Instead of applying full crosstalk cancellation across all frequencies, the system applies partial cancellation only to the mid-frequency band where it is most effective. This partial action avoids the distortion and directional information loss that would occur with full-spectrum application.
3Object-affected harmful factors
If crosstalk cancellation is applied to high-frequency portions, then audible artifacts and errors are introduced, but the sound becomes harsh to the listener
Solution Approach 1:
The audio signal is segmented into frequency bands, allowing the system to process high-frequency components separately. This enables selective application of crosstalk cancellation to the mid-frequency band while excluding high-frequency components that would generate audible artifacts.
Solution Approach 2:
The system extracts and processes only the mid-frequency band through crosstalk cancellation, separating this portion from the low and high frequency components. This extraction prevents the introduction of audible artifacts in the high-frequency range while maintaining effective crosstalk reduction where needed.
Data Source
AI summary
In various embodiments, a computer-implemented method comprises generating, by an audio playback module from an input audio signal, a plurality of audio feeds that includes at least a midband feed and an additional feed, applying a crosstalk cancellation filter on the midband feed to generate a processed midband audio signal, applying an additional filter on the additional feed to generate an additional audio signal, where the additional filter applies at least a delay value to the additional feed, generating a plurality of processed audio signals based on both the processed midband audio signal and the additional audio signal; and transmitting, by the audio playback module, the plurality of processed audio signals to a plurality of speakers.