Sound Reproduction System Spatial Sound Pressure Control
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Solution Overview
Problem
Existing sound reproduction systems, such as those described in D1, fail to effectively ensure that a desired sound is clearly audible only to the intended person in a listening area while minimizing its audibility to others in surrounding areas, as they often allow the sound to be heard by individuals outside the intended region.
Innovation Solution
A sound reproduction system that emits a first sound intended for an object person and a second sound with specific control characteristics, where the first sound is clearly audible in a designated region and the second sound has a lower sound pressure in that region but equal sound pressure in surrounding regions, using a combination of control filters and sound sources to achieve this spatial sound pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sound is emitted from a loudspeaker to reach the ears of object persons in a first region, then the sound is clearly audible to object persons, but the sound is also audible to non-object persons in surrounding second regions
Solution Approach 1:
The sound field is segmented into multiple regions (first region for object persons and second region for non-object persons) with different sound pressure control characteristics. The control characteristic is divided into a first control characteristic for the first region and a second control characteristic for the second region, allowing independent optimization of sound distribution in each region.
Solution Approach 2:
Different sound pressure control characteristics are applied to different spatial regions. The first control characteristic optimizes sound pressure for object persons in the first region, while the second control characteristic controls sound pressure for non-object persons in the second region, creating locally optimized sound quality in each region.
2Illumination intensity
If sound pressure is increased in the first region for object persons, then audibility to object persons is improved, but sound pressure in surrounding second regions also increases making sound audible to non-object persons
Solution Approach 1:
The sound pressure control is segmented into region-specific characteristics. The first control characteristic increases sound pressure in the first region for object persons, while the second control characteristic simultaneously controls to reduce sound pressure in the second region for non-object persons, achieving spatially differentiated sound pressure management.
Solution Approach 2:
The control characteristics are defined with different parameter settings for different regions. The first control characteristic uses parameters optimized for the first region (higher sound pressure for object persons), while the second control characteristic uses parameters optimized for the second region (lower sound pressure for non-object persons), allowing independent parameter optimization for each region.
Data Source
AI summary
Disclosed herein is a sound reproduction system configured to emit a first sound and a second sound from a loudspeaker at a time. The first sound is intended to reach ears of an object person's. The second sound is intended to reach ears of a non-object person's and compliant with a control characteristic. The control characteristic is defined such that the second sound includes a component which is emitted from the loudspeaker toward a first region occupied by the object person and has a sound pressure lower than a predetermined value, and another component which is emitted from the loudspeaker toward a second region occupied by the non-object person and has a sound pressure equal to the predetermined value.