Compact Loudspeaker System Using Active Driver Piston Action
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Solution Overview
Problem
Current speaker systems require large enclosures or multiple speakers to achieve full frequency reproduction, especially for low frequencies, making them unsuitable for small spaces, and they often rely on subwoofers and crossover networks which can lead to inefficiencies and size constraints.
Innovation Solution
A full spectrum speaker system design that uses smaller speakers without crossover networks, featuring an internal active driver acting as a piston to enhance bass response and reduce enclosure size, with a bass chamber and strategically positioned passive and active speakers to produce a wide range of frequencies, including low frequencies, without the need for subwoofers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If large enclosures or large sized loudspeakers are used to produce low frequency response, then low frequency reproduction quality is improved, but the device size and space requirements increase
Solution Approach 1:
The patent combines multiple speaker drivers (woofers, mid-range drivers, tweeters) into a single integrated enclosure, merging their functions to achieve full frequency range reproduction. The passive radiator is also integrated within the same enclosure space, allowing compact design while maintaining bass response quality through coordinated operation of all drivers.
Solution Approach 2:
The active woofer serves multiple functions: it acts as both an active transducer for mid-bass frequencies and as a piston to pressurize the enclosed air volume for enhancing passive radiator operation. This multi-functionality eliminates the need for separate subwoofer enclosures or additional active bass drivers, reducing overall system size while maintaining low frequency reproduction quality.
2Measurement precision
If crossover circuits and multiple speakers covering different parts of the audible spectrum are utilized, then frequency response accuracy is improved, but device complexity increases
Solution Approach 1:
The patent removes crossover circuits from the system entirely. Instead of using electronic crossovers to divide frequency ranges among multiple speakers, the design relies on natural driver frequency responses and acoustic interactions within the enclosed volume to achieve frequency separation, thereby simplifying the system while maintaining accurate frequency response.
Solution Approach 2:
The system uses the passive radiator's natural resonance and the acoustic pressure generated by the active woofer's piston motion to automatically manage frequency distribution. The enclosed air volume acts as a spring that naturally couples the drivers, eliminating the need for external control circuits or complex electronic management systems.
3Measurement precision
If passive radiators are used to increase overall sound pressure level, then bass response is improved, but the enclosure volume requirements increase
Solution Approach 1:
The enclosed air volume acts as an intermediary spring between the active woofer and the passive radiator. This air spring transfers and amplifies the acoustic energy from the active driver to the passive radiator, enabling the passive radiator to produce enhanced bass response without requiring a large enclosure volume. The air spring efficiently couples the two drivers, maximizing bass output in a compact space.
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 design achieves superior sound pressure levels and spatial sound field performance in a compact enclosure, allowing for high-fidelity sound reproduction in small spaces, comparable to high-end systems, with improved transient response and decibel levels, and the ability to project an enhanced audio image without large amplifiers.
Implementation Method 1
The movement of the active speaker's diaphragm pressurizing and depressurizing causes the passive speaker to vibrate
Implementation Method 2
The pressure inside the engine, controlled by the piston, on the back of the driver
Data Source
AI summary
The present invention is a small high fidelity full spectrum speaker, which arranges a passive speaker and two active speakers such that fidelity of a larger speaker or one with a cross-over network is achieved.