Sound Field Control System Initial Test Sound Pickup Time Determination
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Solution Overview
Problem
Conventional sound field control systems face challenges in accurately determining the sound pickup time of the initial test sound when using separate devices for sound emission and pickup, especially over wireless communication, leading to potential noise detection errors and inaccurate measurement of sound field characteristics.
Innovation Solution
A sound field control system that includes a signal supply unit for emitting a test signal sequence and an initial test sound pickup time determination unit to accurately determine the sound pickup time of the initial test sound by detecting the initial sound from the sound pickup signal, and performing synchronous addition and delay processes based on this determination to enhance signal-to-noise ratio and correct for sound delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate devices (e.g., smartphone) are used for sound pickup instead of integrating the microphone with the acoustic device, then operational flexibility and ease of use are improved, but accurate determination of sound pickup time becomes difficult due to unknown sound emission timing and communication delays
Solution Approach 1:
The system emits test sounds periodically multiple times and performs synchronous addition of the picked-up sounds. By repeating the test sound emission at regular intervals and accumulating the signals, the system can accurately determine sound pickup time despite using separate devices, as the periodic nature allows for reliable temporal correlation and noise reduction through signal averaging.
2Reliability
If test sound is picked up multiple times and synchronous addition is performed to decrease noise, then signal-to-noise ratio is improved, but accurate determination of initial test sound pickup time becomes more critical and difficult
Solution Approach 1:
The system performs preliminary detection of the initial sound from the sound pickup signal before performing synchronous addition. By identifying the initial test sound pickup time in advance through detecting the first sound occurrence, the system establishes a reference point that guides the subsequent synchronous addition process, ensuring that multiple test sound pickups are aligned correctly to maximize signal-to-noise ratio while maintaining temporal accuracy.
3Productivity
If sound pickup time is determined based solely on signal level detection, then the measurement process is simple and fast, but unintended noise may be erroneously detected as test sound
Solution Approach 1:
The system uses feedback from the sound emission interval information to verify detected sounds. After detecting an initial sound based on signal level, the system checks whether subsequent sounds are detected at expected intervals matching the predetermined sound emission pattern. This feedback mechanism allows the system to maintain fast measurement speed while confirming that detected sounds correspond to actual test sounds rather than random noise, by verifying temporal consistency with the known emission schedule.
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
Enables accurate measurement of the sound pickup time of the initial test sound, improving the accuracy of sound field control and speaker frequency measurements, even in environments with unstable wireless communication, and effectively reduces noise interference.
Implementation Method 1
a sound pickup unit which picks up a sound including a test sound sequence emitted from a speaker based on a test signal sequence, using a microphone
Data Source
AI summary
A sound field control system SY according to the present invention is provided with: a signal supply unit 210 which supplies a test signal sequence to a speaker; and an analysis unit 150 which picks up a sound including a test sound sequence emitted from a speaker based on a test signal sequence using a microphone, and which determines the sound pickup time of an initial test sound among test sounds included in the test sound sequence, wherein the analysis unit 150 detects the initial sound from the sound pickup signal picked up using the microphone, determines whether a sound is detected after the elapse of a sound emission interval, from the sound pickup time of the detected initial sound, between the initial test sound defined by the test signal sequence and an n-th (where n is an integer such that n≥2) test sound emitted from the same speaker as the initial test sound, and, upon determining that the sound has been detected, determines the sound pickup time of the initial sound as the sound pickup time of the initial test sound.