Out-of-Head Audio Filter Gain Timing for Stable Sound Localization
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Solution Overview
Problem
In out-of-head localization devices, filter processing that emphasizes certain frequencies can degrade sound quality and filter characteristics, leading to a strange feeling for users, and existing sound volume correction methods impose a heavy processing load and do not completely eliminate volume changes during reproduction.
Innovation Solution
A processing device and method that set an appropriate gain value by acquiring frequency and time information from the reproduction signal, using spatial acoustic transfer characteristics and inverse filters to convolve audio signals, allowing for precise sound localization without degrading sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If filter processing that emphasizes certain frequencies is performed in out-of-head localization device, then sound localization accuracy is improved, but sound quality and filter characteristics are degraded
Solution Approach 1:
The patent changes the parameter of gain application timing from continuous monitoring to pre-calculated timing based on frequency and time information. By determining the gain value in advance based on the reproduction signal's characteristics, the system achieves accurate sound localization without degrading sound quality, as the gain is applied only when necessary rather than continuously.
2Stability of the object's composition
If sound volume correction device monitors signal level at all times, then volume stability is improved, but processing load is increased
Solution Approach 1:
The patent implements periodic action by calculating the gain value in advance based on frequency and time information extracted from the reproduction signal, rather than continuously monitoring the signal level. The gain is applied at specific time points determined by the pre-calculated information, reducing processing load while maintaining volume stability.
Solution Approach 2:
The patent applies preliminary action by determining the gain value before actual sound reproduction based on the frequency and time information of the reproduction signal. This advance calculation eliminates the need for continuous monitoring during reproduction, significantly reducing processing load while ensuring stable volume control.
3Stability of the object's composition
If gain value is adjusted during reproduction, then volume stability is improved, but feeling of strangeness is not completely eliminated
Solution Approach 1:
The patent changes the parameter of gain determination from real-time signal level monitoring to pre-calculated gain based on frequency and time information. By determining the gain value in advance based on the reproduction signal's characteristics, the system achieves volume stability without causing the feeling of strangeness, as the gain adjustments are based on inherent signal properties rather than continuous modifications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate sound localization with improved sound quality by setting an appropriate gain value, reducing the feeling of strangeness during reproduction and eliminating the need for continuous signal monitoring, thus optimizing processing efficiency.
Implementation Method 1
a processing device generates a filter on the basis of a sound pickup signal obtained by collecting measurement signals. The generated filter is convolved to 2-ch audio signals, thereby implementing out-of-head localization reproduction.
Data Source
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AI summary
Provided are an out-of-head localization system, a filter generation device, a method, and a program capable of appropriate processing. A processing device (200) according to an embodiment includes a frequency information acquisition unit (213) that acquires frequency information on the basis of a frequency response of a filter used in filter processing on a reproduction signal, a time information acquisition unit (216) that acquires, on the basis of the frequency information, time information of a reproduction signal, a time signal extraction unit (217) that extracts, on the basis of the time information, a time signal corresponding to at least some time of the reproduction signal, a filter processing unit (218) that performs filter processing on the time signal, and a gain acquisition unit (219) that acquires a gain on the basis of the time signal not having undergone filter processing and a processed time signal having undergone filter processing.