Dynamic Sound Source Positioning in Audio Signal Processing
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Solution Overview
Problem
Conventional sound field controllers cannot move the sound source positions of pseudo sound reflections, limiting the ability to simulate dynamic acoustic spaces and create a realistic sense of presence for listeners.
Innovation Solution
A sound effect producing apparatus with an input portion, memory portion, pseudo sound reflection producing portion, and effect provision portion that localizes pseudo sound reflections using sound source position information and predetermined directions, allowing the sound source positions to be moved and creating a dynamic sound field effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sound source positions of pseudo sound reflections are predetermined correspondingly to the acoustic space, then the sound field effect can be reproduced accurately, but the sound source positions cannot move following the direct sound movement
Solution Approach 1:
The patent transforms the static sound source position information into dynamic information that can follow the movement of the direct sound. The effect provision portion dynamically adjusts the sound source positions of pseudo sound reflections based on the position of the direct sound, enabling the sound field to adapt to moving sound sources while maintaining acoustic space characteristics.
Solution Approach 2:
The patent changes the parameter of sound source position from a fixed predetermined value to a variable that depends on the direct sound position. By making the sound source position information variable rather than constant, the system achieves both accuracy (through convolution with impulse response) and adaptability (through dynamic position adjustment).
2Adaptability or versatility
If separate sound source position information is stored for each direction to enable movement, then the sound source positions can be moved, but the data complexity and storage requirements increase
Solution Approach 1:
The patent makes the sound source position information serve multiple functions: it provides the basis for localization and simultaneously enables movement tracking. The same position information is used both to establish the initial pseudo sound reflection positions and to track movements, eliminating the need for separate position data for each direction.
Solution Approach 2:
The system uses feedback from the direct sound position to adjust the pseudo sound reflection positions. The effect provision portion continuously monitors the direct sound position and uses this information to update the sound source positions of pseudo sound reflections, creating a dynamic system without requiring pre-stored position data for all possible directions.
Data Source
AI summary
A sound effect producing apparatus includes an input portion, a memory portion, a pseudo sound reflection producing portion, and an effect provision portion. The input portion performs inputting of an audio signal. The memory portion stores sound effect information that includes production information for producing a pseudo sound reflection corresponding to a sound reflection generated in a predetermined acoustic space and sound source position information showing a sound source position of the pseudo sound reflection. The pseudo sound reflection producing portion produces a pseudo sound reflection based on the production information. The effect provision portion performs a process of localizing the pseudo sound reflection using a predetermined direction as a reference, based on the audio signal and the sound source position information.