3D Sound Filter Selection for Low-Motion Direction Perception
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Solution Overview
Problem
Conventional sound reproduction devices struggle to appropriately process sounds that are difficult to perceive in a three-dimensional sound field, leading to misperception of sounds with minimal changes in direction.
Innovation Solution
An information processing method that calculates the angular amount of change in the predetermined direction and selects a 3D sound filter to emphasize sounds more strongly when the change is less than a threshold, using techniques like expanding the angular amount of change and applying an expansion coefficient to enhance sound perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sound reproduction methods are used, then the system is simple and easy to operate, but sounds with minimal direction changes cannot be perceived appropriately
Solution Approach 1:
The system pre-calculates and stores multiple 3D sound filters corresponding to different incoming directions before actual sound reproduction. When processing sound, the system only needs to select from pre-prepared filters based on the calculated angular amount of change, avoiding complex real-time calculations and enhancing perception accuracy without proportionally increasing system complexity.
Solution Approach 2:
The system dynamically adjusts the selection of 3D sound filters based on the calculated angular amount of change in the predetermined direction. When the angular change is small, the system selects filters that emphasize sound directionality; when angular change is large, it selects filters appropriate for significant direction changes. This dynamic adaptation resolves the contradiction by making the system complex only when necessary for accurate perception.
2Measurement precision
If 3D sound filters are selected based on angular amount of change, then sound perception accuracy is improved, but processing time increases
Solution Approach 1:
The system pre-calculates angular amounts of change for different sound scenarios and pre-selects appropriate 3D sound filters, storing these mappings in advance. During actual sound reproduction, the system only needs to retrieve the pre-selected filter based on the current sound's characteristics, significantly reducing processing time while maintaining high perception accuracy.
Solution Approach 2:
The system calculates the angular amount of change and uses this partial information to select from a predefined set of filters rather than performing exhaustive search or real-time optimization. This partial action approach achieves sufficient perception accuracy without the time cost of complete analysis, resolving the contradiction between precision and processing speed.
Data Source
AI summary
An information processing method includes: calculating an angular amount of change in a predetermined direction in a time domain from sound information including information regarding a predetermined sound and information regarding the predetermined direction; selecting, based on the information regarding the predetermined direction, a 3D sound filter for causing an inputted sound to be perceived as a sound coming from an incoming direction from among 3D sound filter candidates each prepared for a different incoming direction; and generating an output sound signal by inputting the information regarding the predetermined sound to the 3D sound filter selected, in which, when the angular amount of change calculated is less than a threshold, the selecting a 3D sound filter includes determining the 3D sound filter such that the predetermined sound is more strongly emphasized than when the angular amount of change calculated is greater than or equal to the threshold.