Speaker Systems with Forward and Backward Passive Radiators
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Solution Overview
Problem
Conventional speaker systems often require external subwoofers for bass audio, leading to issues like bass drop-outs and stereo imaging distortion, especially in applications requiring deep bass frequencies such as gaming and music soundtracks.
Innovation Solution
A speaker system incorporating a low frequency array (LOFAR) of active drivers and passive radiators, where the corner frequency of each subsystem is a harmonic of the passive radiator's resonance frequency, and the active driver's resonance frequency is a harmonic of the passive radiator's, creating a hemispherical sound field that eliminates the need for external subwoofers and reduces distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional speaker systems use external subwoofers for bass audio, then bass frequency coverage is improved, but bass drop-outs and stereo imaging distortion occur
Solution Approach 1:
The patent combines multiple passive radiators (front-facing and rear-facing) with active drivers into a single integrated speaker system. This merging eliminates the need for separate external subwoofers while maintaining continuous bass response and proper stereo imaging, thereby resolving both bass drop-outs and imaging distortion issues
2Quantity of substance
If passive radiators are added to speaker subsystems, then bass response is enhanced, but device complexity increases
Solution Approach 1:
The patent introduces a spatial dimension by positioning passive radiators at both the front and rear of the speaker subsystem. This dimensional approach creates a hemispherical sound field that enhances bass response while distributing the complexity across multiple simple, identical components rather than one complex component
3Object-generated harmful factors
If corner frequency is set as a harmonic of passive radiator resonance frequency, then distortion is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the frequency parameter relationship by setting the corner frequency as a specific harmonic (e.g., second or third harmonic) of the passive radiator's resonance frequency. This parametric relationship naturally reduces distortion while providing clear design guidelines that simplify rather than complicate the manufacturing 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
This configuration enhances bass response, reduces distortion, and improves stereo imaging by creating a more efficient and defined spherical bass sound field, reducing the need for external subwoofers and minimizing display vibration, thus enhancing gaming and audio experiences.
Implementation Method 1
The first speaker subsystem has a corner frequency that is a first predetermined harmonic of the resonance frequency of the first passive radiator. The first active driver has a resonance frequency that is a second predetermined harmonic of the resonance frequency of the first passive radiator.
Data Source
AI summary
A speaker system comprises a first speaker subsystem comprising a first active driver and a first passive radiator that is forward facing; and a second speaker subsystem comprising a second active driver and a second passive radiator that is backward facing. The first speaker subsystem has a corner frequency that is a first predetermined harmonic of the resonance frequency of the first passive radiator, and the first active driver has a resonance frequency that is a second predetermined harmonic of the resonance frequency of the first passive radiator. The second speaker subsystem has a corner frequency that is the first predetermined harmonic of the resonance frequency of the second passive radiator, and the second active driver has a resonance frequency that is the second predetermined harmonic of the resonance frequency of the second passive radiator.