Sound Control Filters for Hearing Position Adaptation
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Solution Overview
Problem
Existing signal processing technologies fail to provide expected sound control effects when a hearer moves, as the transfer functions calculated in advance do not match the new hearing position, especially if the movement is significant or the reproduction environment significantly alters the sound transfer.
Innovation Solution
A signal processing device and method that design sound control filters for various hearing conditions, including likely movement positions of the hearer, allowing the device to maintain sound control effects even when the hearer's position changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transfer functions are calculated in advance for a fixed hearing position, then sound control effects can be achieved at that specific position, but the sound control effects deteriorate when the hearer moves to a different position
Solution Approach 1:
The patent calculates and stores multiple transfer functions in advance for different hearing positions before the hearer actually moves. When the hearer is detected to be at a certain position, the corresponding pre-calculated transfer function is selected and applied, eliminating the need for real-time recalculation and maintaining sound control effects across position changes
Solution Approach 2:
The patent makes the transfer function selection dynamic by detecting the hearer's position and automatically switching between different pre-calculated transfer functions based on the detected position. This dynamic adaptation ensures that the appropriate transfer function is always used, maintaining reliable sound control effects regardless of hearer movement
2Reliability
If multiple sound control filters are designed for different hearing conditions, then sound control effects can be maintained when the hearer moves, but the device complexity increases
Solution Approach 1:
Multiple sound control filters corresponding to different hearing conditions are calculated and stored in advance. During operation, the system simply selects from these pre-prepared filters based on detected hearing conditions, avoiding the complexity of real-time calculations while maintaining reliable sound control effects
Solution Approach 2:
The system detects the actual hearing conditions (such as hearer position) and uses this feedback information to select the appropriate pre-calculated sound control filter. This feedback mechanism ensures that the correct filter is applied without requiring complex real-time analysis, balancing reliability with manageable device complexity
Data Source
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AI summary
A signal processing device (1) includes one or more filter processors (302a to 302n) that perform sound localization processing of an input acoustic signal and generate output signals; a coefficient setter (305) that sets, for the filter processors (302a to 302n), a plurality of filter coefficients for use in the filter processors (302a to 302n); an output data selector (402) that selects, out of the output signals subjected to the sound localization processing by the filter processors (302a to 302n), output signals to be output to a left speaker (201) and a right speaker (202); a time measurer (403) that monitors a time for switching the output signals; and a controller (401) that causes the output data selector (402) to select the output signals in accordance with the time for switching the output signals. The plurality of filter coefficients include filter coefficients generated under a plurality of hearing conditions.