Balanced Push-Pull Loudspeaker Reducing Harmonic Distortion
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Solution Overview
Problem
Conventional loudspeaker devices experience poor frequency response in the low frequency region due to smaller sizes and design compromises, leading to sound distortion when reproducing low frequency sounds.
Innovation Solution
A balanced push-pull loudspeaker device with two loudspeaker components and an audio processing module that generates bass audio signals by mixing low frequency parts of audio channel signals, inverts and mixes these signals, and outputs them to vibration diaphragms that thrust in opposite directions within the loudspeaker box, balancing internal capacity and reducing harmonic distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the loudspeaker component and loudspeaker box size are reduced for aesthetic purposes and easy disposition, then the device becomes more compact and visually appealing, but the frequency response in the low frequency region deteriorates and sound distortion occurs
Solution Approach 1:
The loudspeaker system is divided into two independent loudspeaker components (first and second loudspeaker components) with separate vibration diaphragms. Each component handles specific audio channels, allowing the system to achieve better low frequency response within a compact box by distributing the acoustic load rather than relying on a single large driver.
Solution Approach 2:
The patent applies inverse phase signaling to the second loudspeaker component. The audio signal for the second component is inverted (phase-shifted by 180 degrees) relative to the first component. This causes the vibration diaphragms to move in opposite directions, creating a push-pull effect that balances the internal air pressure changes and reduces distortion in the limited box volume.
2Device complexity
If a single loudspeaker component is used to reproduce low frequency sounds, then the device structure remains simple, but the air volume pushed is insufficient and low frequency sound effects are not enhanced
Solution Approach 1:
The patent combines two loudspeaker components working in unison to handle the low frequency audio content. By merging the output of both components, the system effectively doubles the air volume pushing capability compared to a single driver, enabling better low frequency reproduction without requiring a proportionally larger box volume.
Solution Approach 2:
The inverted phase signal applied to the second loudspeaker component creates a push-pull configuration where the two diaphragms move in opposite directions. This inversion technique allows the system to push air more effectively by creating balanced pressure changes, thereby increasing the total air volume displaced while maintaining a compact form factor.
3Device complexity
If both vibration diaphragms thrust in the same direction simultaneously, then the audio signal processing is simple, but noise and harmonic distortion are generated due to unbalanced internal capacity
Solution Approach 1:
The patent inverts the phase of the audio signal for the second loudspeaker component relative to the first component. This inversion causes the vibration diaphragms to thrust in opposite directions simultaneously, creating a balanced push-pull effect. The opposite thrusting balances the internal air pressure changes and capacity utilization, thereby eliminating noise and harmonic distortion that would otherwise result from unbalanced simultaneous thrusting.
Solution Approach 2:
The patent converts the potential harmful effect of simultaneous diaphragm thrusting (which causes distortion) into a beneficial push-pull configuration. By applying inverse phase signaling, the system transforms what would be a distortion-generating condition into a balanced acoustic environment where the opposite-direction thrusts cancel out harmful pressure imbalances and reduce noise and harmonic distortion.
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 enhances low frequency sound reproduction by balancing the internal capacity of the loudspeaker box, reducing noise and harmonic distortion caused by simultaneous diaphragm thrusting, thereby improving sound quality and frequency response.
Implementation Method 1
the first vibration diaphragm and the second vibration diaphragm respectively thrust in two opposite directions relative to the inner space of the loudspeaker box
Implementation Method 2
low frequency sound waves have longer wavelengths, the air volume to be pushed for generating such sound waves is greater
Data Source
AI summary
A balanced push-pull loudspeaker device includes a loudspeaker box, a first loudspeaker component, a second loudspeaker component and an audio processing unit. The audio processing unit generates a bass audio signal according to low frequency parts of a first audio channel signal and of a second audio channel signal, mixes the bass audio signal and a high frequency part of the first audio channel signal, outputs a mixture of the bass audio signal and the high frequency part of the first audio channel signal to the first loudspeaker component, inverts the bass audio signal, mixes the inverted bass audio signal and a high frequency part of the second audio channel signal, and outputs a mixture of the inverted bass audio signal and the high frequency part of the second audio channel signal to the second loudspeaker component. This disclosure also provides a control method applied to the above loudspeaker device.