Loudspeaker Diaphragm Interaction Compensation
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Solution Overview
Problem
In loudspeaker systems where multiple drivers share the same enclosure, acoustic pressure changes caused by one driver affect others, leading to diaphragm interaction issues, such as reduced displacement and potential clipping distortion, especially at low frequencies, resulting in energy wastage and compromised performance.
Innovation Solution
A loudspeaker apparatus with a controller that applies algorithms or transfer functions to audio signals to compensate for acoustic pressure variations within the enclosure, allowing each driver to operate as if it had its own enclosure, thereby minimizing diaphragm interference and maintaining sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple loudspeakers share the same enclosure inner space, then the device complexity is reduced and volume efficiency is improved, but diaphragm interaction occurs causing clipping distortion and potential damage
Solution Approach 1:
The system applies preliminary anti-action by generating a compensatory signal that counteracts the acoustic pressure changes caused by diaphragm interaction. The controller predicts the interaction effect and applies an opposing signal to cancel it out, preventing clipping distortion and potential damage before they occur.
Solution Approach 2:
The system uses feedback by continuously monitoring the audio signal and adjusting the compensatory signal based on the predicted diaphragm interaction. The controller processes the input signal, estimates interaction effects, and dynamically adjusts the compensation to maintain reliable diaphragm operation.
2Use of energy by moving object
If multiple loudspeakers share the same enclosure inner space, then energy efficiency is improved, but acoustic pressure changes cause diaphragm interaction leading to energy wastage
Solution Approach 1:
The system prevents energy wastage by applying preliminary anti-action through compensatory signals that counteract diaphragm interaction. This ensures that the energy driving the loudspeakers is effectively converted to useful sound output rather than being wasted on counterproductive interactions between diaphragms.
Solution Approach 2:
The system converts the harmful diaphragm interaction into a beneficial effect by using the predicted interaction signal to generate compensation. What would normally be harmful (diaphragm interaction causing energy wastage) is transformed into useful information for creating the compensatory signal that improves overall energy efficiency.
3Volume of stationary object
If multiple loudspeakers share the same enclosure inner space, then the full volume of the enclosure can be utilized, but acoustic pressure variations cause diaphragm interference reducing sound quality
Solution Approach 1:
The system maintains high sound quality despite full enclosure volume utilization by using feedback control. The controller continuously processes the audio signal, estimates diaphragm interaction effects, and applies compensatory adjustments to ensure that the output sound quality matches the intended signal, effectively canceling out the interference caused by shared enclosure space.
Solution Approach 2:
The system replaces mechanical isolation (which would require separate enclosures or compartments) with a signal processing approach. Instead of physically separating the loudspeakers to prevent interaction, the system uses electronic compensation through the controller to achieve the same effect, allowing full utilization of the enclosure volume while maintaining sound quality.
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 solution effectively compensates for acoustic pressure changes, reducing diaphragm interference and maintaining the intended sound output, enhancing the performance and efficiency of the loudspeaker system by utilizing the full volume of the enclosure.
Implementation Method 1
the movement of the diaphragm of one loudspeaker would affect the diaphragm of another loudspeaker due to the acoustic pressure change within the enclosure box
Implementation Method 2
generating a compensated audio signal based on an acoustic pressure variation of the inner space induced by operation of the first and second acoustic transducers
Data Source
AI summary
The disclosure provides a loudspeaker apparatus and a method of driving the acoustic transducers by predicting and compensating a physical phenomenon of acoustic pressure changes within an enclosure caused by at least one of the acoustic transducers. The loudspeaker apparatus includes an enclosure having an inner space, a first acoustic transducer, a second acoustic transducer, and a controller. The first and second acoustic transducers are mounted on the enclosure and share the same inner space of the enclosure, such as sound bar and the likes. For the operation of the loudspeaker apparatus, the controller applies an algorithm or mathematical model (e.g., transfer function) to an audio signal received from an external source, so that the sound respectively outputted by the first and second acoustic transducers sharing the same inner space may be compensated as if the first and second acoustic transducers are individually mounted on its own enclosure.