Resonant Frequency Identification via Broadcast Sound Pressure
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Solution Overview
Problem
Existing methods fail to accurately identify resonant frequencies in spaces where audio facilities are installed due to changes in environmental conditions, leading to suboptimal equalizer settings that cannot effectively suppress resonance during sound broadcasting.
Innovation Solution
A method and system that identify resonant frequencies by measuring sound pressure changes in specific frequency bands using broadcast sounds, employing a broadcast facility, speaker, and microphone to detect resonant frequencies through sound pressure variations, allowing for real-time adjustment of equalizer settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resonant frequency is specified by producing special sound at installation timing, then initial equalizer settings can be made, but the resonant frequency may differ from actual broadcasting conditions leading to ineffective resonance suppression
Solution Approach 1:
The system dynamically identifies resonant frequency during actual sound broadcasting operations rather than using static installation-time measurements. The resonant frequency identification unit continuously monitors sound pressure levels during broadcasting to detect standing waves, ensuring the equalizer settings adapt to current environmental conditions including temperature, humidity, and audience presence.
Solution Approach 2:
The system implements feedback by measuring sound pressure levels during broadcasting, comparing them against expected levels, and using this information to identify resonant frequencies in real-time. This feedback loop allows the equalizer to be adjusted based on actual broadcasting conditions rather than installation-time assumptions.
2Ease of manufacture
If equalizer settings are adjusted based on installation-time resonant frequency measurement, then initial resonance control is achieved, but settings become suboptimal when environmental conditions change
Solution Approach 1:
The system performs preliminary resonant frequency identification during installation to establish initial equalizer settings, enabling quick deployment. However, it also maintains the capability to re-identify resonant frequencies during broadcasting operations to adapt to environmental changes, thus combining initial setup simplicity with ongoing adaptability.
Solution Approach 2:
The system monitors changes in environmental parameters such as temperature, humidity, and audience presence during broadcasting operations. When resonant frequency shifts are detected through sound pressure level analysis, the equalizer settings are dynamically adjusted to maintain optimal resonance suppression despite environmental variations.
3Reliability
If resonant frequency identification is performed during broadcasting operations, then accurate resonance suppression is achieved, but additional measurement and processing steps are required
Solution Approach 1:
The sound pressure level measurement unit serves dual purposes: it monitors overall sound quality during broadcasting and simultaneously identifies resonant frequencies by detecting abnormal pressure increases. This multi-functionality allows accurate resonance suppression without adding dedicated complex measurement equipment or procedures.
Solution Approach 2:
The system uses the broadcasting sound itself as the test signal for resonant frequency identification, eliminating the need for separate special test tones or dedicated measurement phases. The normal broadcasting operations provide the necessary data for both content delivery and resonant frequency detection, simplifying the overall process.
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 identification of resonant frequencies in varying environmental conditions, ensuring clear sound broadcasting by adjusting equalizer settings to prevent resonance, thus improving audio quality.
Implementation Method 1
a speaker (5), to broadcast a broadcast sound (BS) output from the broadcast facility (1) toward a predetermined space (SP)
Implementation Method 2
a broadcast sound collecting microphone (7) to collect the broadcast sound (BS) broadcasted toward the predetermined space (SP)
Implementation Method 3
measuring sound pressure of the broadcast sound (BS) broadcasted toward the predetermined space (SP)
Implementation Method 4
the broadcast sound produced from the audio facility and a reflection sound from an object in the predetermined space may be combined, and a standing wave having an amplitude larger than that of the broadcast sound may be produced in the predetermined space. This phenomenon is called 'resonance'
Data Source
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AI summary
To appropriately identify a resonant frequency when a broadcast sound is broadcasted, a resonant frequency identification method includes broadcasting a broadcast sound toward a predetermined space (SP), measuring sound pressure of the broadcast sound broadcasted toward the predetermined space (SP), and identifying that a resonant frequency in the predetermined space (SP) exists within a specific frequency band, if a change of the measured sound pressure in the specific frequency band is different from a change of sound pressure in a case where there is no resonance in the predetermined space (SP).