Asymmetric Speaker Audio Processing for Mobile Devices
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Solution Overview
Problem
Asymmetric speaker layouts in mobile devices, such as those found in smartphones, pose challenges due to differing frequency magnitude responses and orientation-dependent frequency changes, leading to suboptimal audio playback and spatial imaging, particularly in portrait mode, where cross-talk cancellation can deteriorate sound quality.
Innovation Solution
A method that splits audio signals into multiple frequency bands and applies speaker-specific correction filters and processing modes based on device orientation, using multi-band dynamic range compression and peak limiters to optimize loudness and timbre, while bypassing cross-talk cancellation for low frequencies to improve loudness and sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cross-talk cancellation is applied in portrait mode, then spatial imaging may be improved, but loudness and timbre deteriorate without spatial benefit
Solution Approach 1:
The patent implements dynamic switching between processing modes based on device orientation. In portrait mode, the system dynamically selects between a first processing mode (frequency band splitting) and a second processing mode (cross-talk cancellation) depending on whether spatial effect or loudness/timbre is prioritized. This dynamic adaptation resolves the contradiction by allowing the system to optimize for spatial imaging when needed while preserving loudness and timbre in other scenarios.
Solution Approach 2:
The patent changes processing parameters based on device orientation and mode selection. When switching from portrait to landscape mode, or when changing between first and second processing modes, the system adjusts audio processing parameters including frequency band splitting configurations and cross-talk cancellation settings. This parameter adaptation allows optimal performance for each operational context, resolving the trade-off between spatial imaging and audio quality.
2Device complexity
If a common correction filter is applied to both speakers, then complexity is reduced, but spatial imaging and frequency response optimization deteriorate
Solution Approach 1:
The patent segments the audio processing into speaker-specific correction filters applied independently to each speaker driver. Instead of using a single common filter, the system implements separate correction filters tailored to the specific frequency response characteristics of each speaker. This segmentation allows optimal frequency response correction for each driver while maintaining manageable system complexity through modular filter design.
Solution Approach 2:
The patent applies local quality optimization by using speaker-specific correction filters that are customized for each individual speaker's characteristics. Each filter is designed to address the specific frequency response deficiencies of its associated speaker driver, rather than applying a generic common filter. This localized approach optimizes spatial imaging and frequency response for each speaker while keeping the overall system complexity acceptable.
3Reliability
If frequency band splitting is applied in portrait mode, then loudness is improved, but spatial imaging capability is reduced
Solution Approach 1:
The patent dynamically switches between processing modes based on device orientation. In portrait mode, the system can select the first processing mode (frequency band splitting) to maximize loudness when spatial imaging is not the primary requirement. When the device is rotated to landscape mode or when spatial effects are prioritized, the system dynamically transitions to the second processing mode (cross-talk cancellation) to provide spatial imaging benefits. This dynamic mode switching resolves the contradiction by allowing optimization for different priorities based on operational context.
Data Source
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AI summary
A method of processing audio data for replay on a mobile device with a first speaker and a second speaker, wherein the audio data comprises a respective audio signal for each of the first and second speakers, includes: determining a device orientation of the mobile device; if the determined device orientation is vertical orientation, applying a first processing mode to the audio signals for the first and second speakers; and if the determined device orientation is horizontal orientation, applying a second processing mode to the audio signals for the first and second speakers. Applying the first processing mode involves: determining respective mono audio signals in at least two frequency bands based on the audio signals for the first and second speakers; in a first one of the at least two frequency bands, routing a larger portion of the respective mono audio signal to one of the first and second speakers; and in a second one of the at least two frequency bands, routing a larger portion of the respective mono audio signal to the other one of the first and second speakers. Applying the second processing mode involves applying cross-talk cancellation to the audio signals for the first and second speakers.