Acoustic Processing Apparatus for Dynamic Sound Localization
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Solution Overview
Problem
The challenge is to maintain effective sound image localization in acoustic processing systems, particularly in chair-based speaker units, where changes in the user's position due to reclining angles can cause a deterioration in sound image localization performance, leading to an unusual experience for the listener.
Innovation Solution
An acoustic processing apparatus and method that acquires operation position information of a seat apparatus and uses a sound image localization processor, including a filtering processor and a transaural system filter, to localize sound images at intended positions by adjusting audio signal processing based on the user's reclining angle and position, thereby canceling the influence of transfer functions affecting sound localization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sound image localization processing is performed using fixed speaker unit positions, then the sound image can be localized at a specified position when the user is in a standard sitting position, but the sound image localization deteriorates when the user reclines or changes position
Solution Approach 1:
The system dynamically adjusts the sound image localization processing based on the user's seating position. The operation position information acquisition section detects whether the user is in a standard sitting position or a reclined position, and the sound image localization processor switches between different localization methods accordingly. This dynamic adaptation resolves the contradiction by making the system flexible to position changes while maintaining accurate sound image localization.
Solution Approach 2:
The system changes the parameters of sound image localization processing based on user position. When the user is in a standard sitting position, one set of localization parameters is applied, and when the user reclines, different parameters are used to compensate for the position change. This parameter adjustment maintains sound image localization accuracy across different user positions.
2Device complexity
If the speaker unit position is fixed on the seat apparatus, then the device structure is simple, but the sound image localization performance deteriorates when the user moves or reclines
Solution Approach 1:
The system introduces an intermediary element - the operation position information acquisition section and sound image localization processor - that mediates between the fixed speaker unit and the user's ear. This intermediary detects user position and adjusts the sound processing accordingly, maintaining reliable sound image localization without requiring complex movable speaker structures.
Solution Approach 2:
Instead of using a mechanical system with movable speaker units to track user position, the system substitutes a signal processing approach. The fixed speaker units remain stationary, but the audio signals are dynamically processed based on detected user position information, achieving the same effect without mechanical complexity.
Data Source
AI summary
An acoustic processing apparatus includes an acquisition section that acquires operation position information of a seat apparatus that operates following a movement of a user; and a sound image localization processor that performs sound image localization processing on an audio signal according to the operation position information acquired by the acquisition section, the audio signal being reproduced by a speaker unit provided to the seat apparatus.