Compact Loudspeaker System Using Mid-Side Signal Processing
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Solution Overview
Problem
Conventional audio speaker systems face challenges in reproducing high-quality stereophonic sound in compact environments due to speaker proximity, leading to inadequate sound separation and fidelity, especially in portable devices and limited spaces, where speakers tend to interfere and produce narrower sound fields.
Innovation Solution
The use of a sound system processor that combines mid-side processing with low and high pass filters to generate composite signals for speaker drivers, splitting and filtering signals to direct different frequency components to separate speakers, effectively creating a broad sound field without the need for separate woofers or dedicated subwoofers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If speakers are placed close together in a compact environment, then device size is reduced, but sound separation and fidelity deteriorate
Solution Approach 1:
The audio signal is segmented into different frequency components using filters. The processor divides the audio signal into low-frequency, mid-frequency, and high-frequency bands, directing each to appropriate speakers. This segmentation allows compact speaker placement while maintaining sound separation through frequency-based spatial distribution.
Solution Approach 2:
The system changes the frequency parameter of audio signals by applying low-pass, band-pass, and high-pass filters. By processing signals at different frequency ranges and directing them to different speakers, the system achieves broad sound field reproduction despite close speaker proximity, effectively transforming the frequency distribution to overcome spatial limitations.
2Area of stationary object
If speakers are placed close together, then space utilization is improved, but sound field breadth deteriorates
Solution Approach 1:
The system transitions from spatial separation to frequency-based separation. Instead of relying on physical distance between speakers to create sound field breadth, the processor uses frequency dimension to distribute audio components. Low-frequency, mid-frequency, and high-frequency signals are directed to different speakers, creating a broad sound field perception without requiring large physical spacing.
3Manufacturing precision
If conventional stereo placement is used, then sound fidelity is improved at one position, but adaptability to different listening positions deteriorates
Solution Approach 1:
The processor creates a universal sound reproduction system that functions effectively at multiple listening positions. By distributing frequency components across multiple speakers rather than relying on directional stereo placement, the system provides consistent audio quality whether the listener is positioned in front, behind, or to the sides of the speaker arrangement, making it adaptable to various listening environments.
Data Source
AI summary
A sound system processor for converting left and right channel signals from an audio source into composite left and right signals and employing a mid-side processor, at least one low and high pass filters, and one or more sum processors, together which create at least two or more composite signals for delivery to speaker drivers to generate a broad sound field from a compact multi-speaker sound system source.