Acoustic Image Localization via Frequency Separation
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Solution Overview
Problem
Conventional acoustic image localization systems face challenges in providing an effective acoustic image localization effect within a wide listening range due to limitations in speaker arrangement and deterioration of crosstalk cancellation effects, especially in high frequency bands, making it difficult to faithfully reproduce acoustic transfer functions and maintain the desired localization experience.
Innovation Solution
An acoustic image localization apparatus that adjusts amplitude frequency characteristics and levels of acoustic signals to localize the image at predetermined positions, allowing for crosstalk cancellation avoidance in high frequency bands, enabling effective localization without restricting speaker arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If crosstalk cancellation is performed to faithfully reproduce acoustic transfer functions, then acoustic image localization precision is improved, but the listening range is limited and speaker arrangement is restricted
Solution Approach 1:
The invention changes the frequency parameter by separating high frequency components from the acoustic signal. By removing high frequency components before crosstalk cancellation processing, the system extends the effective listening range while maintaining localization precision for the remaining frequency components. This parameter change allows the acoustic image to be localized effectively across a broader spatial range.
2Measurement precision
If crosstalk cancellation is performed to maintain localization experience, then acoustic image localization precision is improved, but device complexity increases
Solution Approach 1:
The invention segments the frequency spectrum by separating high frequency components from the rest of the acoustic signal. This segmentation allows the system to apply different processing strategies to different frequency ranges, reducing the overall computational complexity while maintaining localization precision for the processed frequency components.
Solution Approach 2:
The invention extracts and removes high frequency components from the acoustic signal before crosstalk cancellation processing. By taking out these problematic high frequency components, the system reduces the computational burden of crosstalk cancellation while preserving the essential localization functionality for the remaining frequency range.
3Measurement precision
If high frequency components are processed with crosstalk cancellation, then acoustic image localization precision is improved, but the localization effect deteriorates in high frequency bands
Solution Approach 1:
The invention converts the harmful effect of high frequency component deterioration into a benefit by explicitly removing these components before processing. By acknowledging that high frequency crosstalk cancellation is problematic and removing these components, the system achieves reliable localization for the remaining frequency range, turning a known weakness into a deliberate design choice that improves overall system reliability.
Data Source
AI summary
An acoustic image localization apparatus according to the present invention that outputs sound from a plurality of speakers so as to localize an acoustic image at a predetermined position on a space as viewed from a listener, the acoustic image localization apparatus comprising: amplitude characteristic adjusting means for adjusting an amplitude frequency characteristic of an inputted acoustic signal such that the acoustic image is localized at a position rotated by a first angle about a position of a listener toward an upper direction from a facing position of the listener; and a plurality of level adjusting means, provided so as to respectively correspond to the plurality of speakers, for adjusting a level of the acoustic signal outputted from the amplitude characteristic adjusting means and for outputting, to a corresponding speaker, the acoustic signal whose level has been adjusted, wherein each of the level adjusting means adjusts the level of the acoustic signal, which is outputted from the amplitude characteristic adjusting means, to a level of the corresponding speaker such that the acoustic image is localized at the predetermined position rotated by a second angle about the position of the listener toward one of directions orthogonal to the rotated directions from the position rotated by the first angle.