Multi-Wire Loudspeaker Panel With Inertia Bar for Resonance Control
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Solution Overview
Problem
Traditional loudspeakers are limited by size, shape, and frequency response, generating unwanted resonances and directional sound patterns due to piston-like diaphragm movement, and there is a need for innovation in flat panel audio loudspeakers like DMLs.
Innovation Solution
A multi-wire loudspeaker system with a panel housing a wire terminal and inertia bar connecting two speakers, featuring different gauge speaker wire portions in electrically activated coils, and an inertia bar ensuring synchronized movement for improved sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional piston-like diaphragm movement is used, then sound waves are generated effectively, but unwanted resonances and directional sound patterns are produced
Solution Approach 1:
The loudspeaker system is divided into multiple independent distributed mode actuators arranged in an array across the panel surface. Each actuator independently drives local vibrational modes, segmenting the sound generation process to eliminate unwanted resonances and directional patterns while maintaining effective sound wave production.
Solution Approach 2:
The system transitions from piston-like diaphragm movement to inducing distributed vibrational modes across the panel surface. Multiple actuators create complex vibration patterns that propagate sound waves effectively while canceling out unwanted resonances through interference of vibrational modes.
2Shape
If flat panel design is used, then slim profile and augmented dispersion are achieved, but device complexity increases
Solution Approach 1:
The panel structure serves multiple functions simultaneously: it acts as the acoustic radiation surface, the mounting substrate for actuators, and the structural framework. This multi-functionality achieves slim profile and augmented dispersion while minimizing the need for additional components, thereby reducing overall device complexity.
Solution Approach 2:
The system merges the acoustic radiating surface with the structural panel into a single integrated component. The panel itself becomes the sound-generating surface, eliminating the need for separate diaphragms and reducing component count, thus achieving slim profile without proportionally increasing complexity.
3Power
If multiple speakers are connected in parallel, then sound output is increased, but synchronization and sound quality deteriorate
Solution Approach 1:
The system segments the acoustic output into multiple spatially distributed actuators that operate independently but are coordinated through a single electrical connection. Each actuator contributes to the overall sound output while the distributed arrangement and common electrical reference ensure synchronization, maintaining sound quality while increasing power.
4Ease of manufacture
If traditional loudspeaker design is used, then effective sound reproduction is achieved, but size and shape limitations restrict performance flexibility
Solution Approach 1:
The system changes the fundamental operating parameters from traditional piston-like diaphragm motion to distributed vibrational modes across a panel. This parameter change enables the same effective sound reproduction with vastly improved adaptability in size, shape, and installation configurations, as the panel can be made in various forms without compromising acoustic performance.
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 enhances sound quality by minimizing unwanted vibrations and resonances, providing a slim profile and augmented dispersion, leading to more immersive and natural sound reproduction.
Implementation Method 1
Electro-acoustic actuators, including electromagnetic coils and magnets or piezoelectric actuators, are utilized in achieving this. When electrical audio signals are applied to these actuators, the panel vibrates, producing sound waves that propagate through the air.
Implementation Method 2
The inertia bar connects the first speaker and the second speaker, which ensures that the two speakers move in unison and produce a consistent sound.
Data Source
AI summary
A device may include a wire terminal with a first and second wire connection, and an inertia bar. It may also have a panel that houses the wire terminal, a first speaker, and a second speaker. The panel may include one or more conduits for a speaker wire, which connects the first speaker and the second speaker to the first and second wire connections, respectively. The first speaker may have a first set of electrically activated coils, which includes a portion of the speaker wire between the first wire connection and the second speaker. Similarly, the second speaker may have a second set of electrically activated coils, which includes a second portion of the speaker wire between the first speaker and the second wire connection. The size of the second portion may differ from that of the first portion. Additionally, the inertia bar may connect the first and second speakers.