Area Reproduction System Spatial Frequency Control
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Solution Overview
Problem
Conventional area reproduction techniques based on spatial filtering suffer from deteriorated performance behind the control line near the speaker array, where the sound waves' interference leads to reduced sound pressure in non-reproduction areas.
Innovation Solution
The method involves converting sound pressure distributions from the frequency domain to the spatial frequency domain, determining spatial frequencies for adjustment based on the positional relationship between the speaker array and the control line, and adjusting sound pressures to minimize sound waves' interference in non-reproduction areas, thereby enhancing area reproduction performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a control line is provided near a speaker array to improve area reproduction performance in the front region, then the sound pressure distribution can be optimized for the reproduction line, but the area reproduction performance backward of the control line deteriorates due to sound wave interference
Solution Approach 1:
The patent transforms the sound pressure distribution from the frequency domain to the spatial frequency domain using Fourier transformation. This dimensional change allows independent control of spatial frequency components, enabling optimization of the sound pressure distribution in the reproduction area while suppressing interference in non-reproduction areas. The spatial frequency domain provides an additional degree of freedom for controlling sound wave interference patterns.
Solution Approach 2:
The patent adjusts the sound pressure distribution by modifying spatial frequency parameters in the transformed domain. By changing the spatial frequency components and their corresponding amplitudes, the system optimizes the sound pressure distribution to enhance area reproduction performance while minimizing harmful interference effects in regions where reproduction is not desired.
2Adaptability or versatility
If spatial filtering is used to present sound only to a specific position, then different sounds can be presented to separate users, but sound pressure in non-reproduction areas is reduced due to wave interference
Solution Approach 1:
The patent employs Fourier transformation to convert the sound pressure distribution into the spatial frequency domain, introducing a new dimensional perspective for controlling sound propagation. This transformation enables independent manipulation of spatial frequency components, allowing the system to maintain reliable sound pressure distribution in reproduction areas while achieving versatile sound presentation to multiple users simultaneously without harmful interference in non-reproduction areas.
Solution Approach 2:
The system modifies the spatial frequency parameters of the sound pressure distribution to optimize both adaptability and reliability. By adjusting the amplitude and phase of specific spatial frequency components, the patent achieves reliable sound pressure control in target areas while maintaining the versatility to present different sounds to different users in the same space.
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 improves area reproduction performance behind the control line by reducing sound pressure in non-reproduction areas and eliminating side lobes in the sound pressure distribution, enhancing auditory clarity and effectiveness.
Implementation Method 1
a reproduction line in which sound waves emitted from the speaker array intensify with each other and a non-reproduction line in which the sound waves weaken with each other
Data Source
AI summary
An area reproduction method includes converting a sound pressure distribution at each frequency of a reproduced sound from a sound pressure distribution in a frequency domain into a sound pressure distribution in a spatial frequency domain. The reproduced sound is realized on a control line, including a reproduction line in which sound waves emitted from a speaker array including a plurality of speakers arranged intensify with each other, and a non-reproduction line in which the sound waves weaken with each other. The method includes determining a spatial frequency for use in adjustment of the reproduced sound, in the sound pressure distribution in the spatial frequency domain, based on a positional relationship between the speaker array and the control line, and adjusting a sound pressure of the reproduced sound, which is to be output by each of the plurality of speakers using the determined spatial frequency.