Multi-Zone Sound Reproduction Using Error Model-Based Speaker Array Control
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Solution Overview
Problem
Existing multi-zone sound reproduction systems face decreased contrast performance due to speaker frequency response errors, leading to increased mutual interference between sound fields and reduced ability to create personalized listening spaces.
Innovation Solution
An error model-based multi-zone sound reproduction method that involves arranging a speaker array, establishing a distribution model of speaker frequency response errors, and calculating a time-domain impulse response filter signal using frequency response consistency constraints to improve contrast performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-domain sound energy contrast control method is used, then causality of impulse response filter signals is guaranteed, but speaker frequency response errors are not taken into account leading to reduced contrast performance
Solution Approach 1:
The patent modifies the time-domain sound energy contrast control method by incorporating speaker frequency response error parameters into the optimization objective function. This allows the system to account for manufacturing variations and frequency response deviations while maintaining causality through time-domain filter design.
Solution Approach 2:
The patent introduces a feedback mechanism where the actual speaker frequency responses are measured and used to update the optimization calculations. This closed-loop approach compensates for manufacturing errors and maintains optimal contrast performance despite variations in speaker characteristics.
2Device complexity
If frequency domain sound energy contrast control method is used, then design is simplified, but causality of impulse response filter signals cannot be guaranteed leading to decreased contrast performance at non-control frequency points
Solution Approach 1:
The patent replaces the frequency domain design approach with a time-domain design approach. This substitution ensures causality is inherently satisfied through the use of causal impulse response filters, while the added complexity of error modeling is offset by the robustness gains in contrast performance.
3Ease of manufacture
If speaker frequency response errors are not considered in design, then design process is simpler, but contrast performance decreases and mutual interference between sound fields increases
Solution Approach 1:
The patent performs preliminary characterization of speaker frequency responses and incorporates this information into the design phase. By pre-measuring and pre-compensating for frequency response errors, the system achieves high contrast performance without requiring complex real-time adjustments during operation.
Data Source
AI summary
An error model-based multi-zone sound reproduction method includes arranging a speaker array, and setting control points for a bright zone and a dark zone. The bright zone is a zone requiring the generation of an independent sound source. The dark zone is a zone not requiring the generation of an independent sound source. The method further includes conducting probability distribution modeling on the speaker frequency response errors. The method further includes, according to the error distribution model, respectively listing expected average sound energy expressions of the bright zone and the dark zone and a frequency response consistency constraint expression of the bright zone. The method further includes calculating a time-domain impulse response filter signal of each channel according to the time-domain sound energy contrast control criterion of the frequency response consistency constraint.