Speaker System Sound Collection Unit Frequency Matching
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Solution Overview
Problem
Speaker systems using pipes or tubes often experience differences in frequency characteristics between input and output signals, and increased pipe or tube length reduces output sound pressure, making them unsuitable for narrow spaces and strong magnetic field environments like MRI apparatuses.
Innovation Solution
A speaker system comprising multiple filters and speakers with distinct transfer characteristics, combined through a sound collection unit to match a target transfer characteristic, using tubes or resonance boxes to enhance sound pressure and reduce frequency differences, and designed to operate effectively in narrow spaces and strong magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pipe or tube is used to transmit sound in narrow spaces or strong magnetic field environments, then the speaker system can be disposed in challenging environments, but the frequency characteristic between input and output signals becomes different and output sound pressure is reduced
Solution Approach 1:
The speaker system is divided into multiple independent speaker units (first speaker, second speaker, etc.), each connected to the sound collection unit through separate pipes. This segmentation allows each speaker to operate independently with its own transfer characteristic, enabling the system to adapt to complex environmental constraints while maintaining overall frequency response through coordinated operation of multiple segments
Solution Approach 2:
Multiple sound waves from different speakers are merged in the sound collection unit. The sound collection unit combines the acoustic outputs from multiple speakers through separate pipes, creating a composite sound field that achieves the desired flat frequency characteristic by integrating contributions from multiple sources with different transfer characteristics
2Length of stationary object
If the length of the pipe or tube is increased to extend sound transmission distance, then the coverage area is improved, but the output sound pressure is reduced
Solution Approach 1:
Multiple sound waves traveling through pipes of potentially different lengths are merged in the sound collection unit. By combining sound waves from multiple speakers, the system compensates for sound pressure loss in longer pipes through constructive interference and increased acoustic energy from multiple sources
Solution Approach 2:
Filters are applied to the input signals before they reach the speakers to pre-compensate for expected sound pressure losses and frequency characteristic changes in the pipes. This preliminary filtering action adjusts the signal characteristics in advance to counteract the deteriorating effects of long pipe transmission
3Reliability
If multiple speakers with different transfer characteristics are used to achieve flat frequency response, then the frequency characteristic is improved, but the device complexity increases
Solution Approach 1:
The audio system is segmented into multiple speaker units, each handling specific frequency ranges or spatial directions. This segmentation allows the complex frequency response requirement to be divided into simpler sub-tasks for each speaker-filter pair, making the overall system design more manageable despite the increased number of components
Solution Approach 2:
The transfer characteristics of individual speakers and filters are carefully selected and adjusted to complement each other. By optimizing the parameters (frequency response, impedance, positioning) of each component, the system achieves a flat overall frequency characteristic while managing the complexity through parameter coordination rather than requiring excessive components
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
The system achieves a flat frequency characteristic over a desired frequency band, reducing sound pressure loss and enabling effective sound transmission in challenging environments, such as MRI apparatuses, by combining sound waves from multiple speakers with tailored filters and using flexible tubes or resonance boxes to enhance sound pressure.
Implementation Method 1
The sound collection unit is configured to combine sound waves output from the plurality of speakers to generate a combined sound wave
Implementation Method 2
Each of the plurality of filters filters a first signal to generate a second signal. The plurality of filters are formed so that a transfer characteristic from the first signal to an output signal matches a target transfer characteristic
Implementation Method 3
Each of the plurality of speakers converts the second signal generated by a corresponding one of the plurality of filters into a sound wave
Data Source
AI summary
According to an embodiment, a speaker system includes filters, speakers, and a sound collection unit. Each of the filters filters a first signal to generate a second signal. The speakers are arranged so that transfer characteristics from the speakers to an evaluation point are different from each other. Each of the speakers converts the second signal generated by a corresponding one of the filters into a sound wave. The sound collection unit combines sound waves output from the speakers to generate a combined sound wave. The filters are formed so that a transfer characteristic from the first signal to an output signal matches a target transfer characteristic, the output signal indicating a sound pressure of the combined sound wave at the evaluation point.