Loudspeaker Array Timing Synchronization via Delay Module
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Solution Overview
Problem
Professional public address systems with multiple loudspeakers face challenges in achieving uniform sound distribution due to varying sound propagation times across different speaker positions, leading to unwanted timing differences in audio signal arrival at listeners, which requires manual measurement and configuration by specialists.
Innovation Solution
A public address system comprising multiple loudspeakers, a measuring device to determine propagation time differences, and a delay module that automatically compensates for these differences using data links, allowing for easy configuration and operation by non-specialists, and optionally including a modelling module for selecting measurement points and a splitter module for frequency selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple loudspeakers are used for different frequency bands and distributed across large areas, then uniform sound distribution is improved, but propagation time differences cause unwanted timing effects at listener positions
Solution Approach 1:
The system performs preliminary measurement of propagation times from each loudspeaker to various measurement points in the sonication region. These measured propagation times are stored and used to calculate appropriate delay values before actual audio playback, ensuring that signals from all loudspeakers arrive simultaneously at the listener position.
Solution Approach 2:
The system uses a measuring device (microphone) to detect audio signals at multiple measurement points and determine propagation time differences. This feedback information is used by the delay module to automatically adjust and optimize the timing of audio signals from different loudspeakers, creating a closed-loop system that ensures precise synchronization.
2Manufacturing precision
If manual measurement and configuration of propagation time differences is performed by specialists, then timing synchronization can be achieved, but system complexity and operational difficulty increase
Solution Approach 1:
The system performs self-measurement and self-configuration of propagation time differences. The measuring device automatically measures propagation times from each loudspeaker to measurement points, and the delay module automatically calculates and applies the appropriate delay values. This eliminates the need for specialist manual measurement and configuration, making the system easy to operate while maintaining precise timing synchronization.
Solution Approach 2:
The system replaces manual mechanical measurement procedures with automated electronic measurement and calculation. Instead of specialists physically measuring and configuring timing parameters, the system uses electronic signal detection, automatic propagation time calculation, and digital delay application, significantly simplifying operation while maintaining precision.
3Ease of operation
If propagation time differences are not compensated, then system operation is simpler, but unwanted timing effects and poor sound distribution occur
Solution Approach 1:
The system merges the measurement function, calculation function, and delay application function into an integrated automated system. The measuring device, delay module, and loudspeaker control are combined to work together seamlessly, automatically measuring propagation times and applying appropriate delays without requiring separate manual intervention steps, thus maintaining operational simplicity while achieving uniform sound distribution.
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
Ensures synchronized audio signal arrival across the sonication region, reducing manual errors and simplifying configuration, while providing reliable and accurate sound distribution even over large distances, suitable for both indoor and outdoor areas.
Implementation Method 1
the distances and therefore the sound propagation times to the sonication region are also different
Data Source
AI summary
Larger regions are often acoustically irradiated with a plurality of loudspeakers. A public address system 1 for the sonication of a sonication region 2 is proposed, wherein the public address system has a multiplicity of loudspeakers 3a, 3b, wherein the loudspeakers 3a, 3b are arranged in the sonication region 2 are designed to output an audio signal based on an input signal 4a, 4b. The public address system has a measuring device 5 for the detection of the audio signal at a measurement point 6 in the sonication region 2, wherein the measuring device 5 is designed to determine a propagation time difference Δtn of the audio signals to the measurement point 6 between each of two speakers 3a,b and to provide the propagation time difference Δtn as propagation time difference data.