Passive Radiator Speaker System Distortion Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional passive radiator speaker systems suffer from insufficient distortion reduction, particularly due to asymmetrical sound radiation patterns that vary with the listener's position, and the limitations of the supporting system's stiffness and resonant frequency, which affect low-frequency sound reproduction.
Innovation Solution
The speaker system employs multiple passive radiators with symmetrical edge shapes and a guide structure to cancel distortion components, ensuring sound radiation in the same direction and optimizing the supporting system's design to reduce resonant frequency and enhance low-frequency sound reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If two passive radiators are attached to surfaces facing each other of the cabinet, then the vibration of the cabinet caused by the passive radiators is canceled, but the sound radiation becomes asymmetrical and distortion cancellation is insufficient depending on listener position
Solution Approach 1:
The patent combines multiple passive radiators (at least two) to work together in unison, merging their sound radiation functions. This allows the system to maintain symmetrical sound radiation patterns while canceling cabinet vibrations, resolving the contradiction between vibration cancellation and distortion reduction.
Solution Approach 2:
The patent employs passive radiators with asymmetrical edge shapes (such as rolled edges) that are specifically designed to generate asymmetrical distortion components. These asymmetrical features create distortion that can be effectively canceled when multiple radiators work together, improving distortion cancellation while maintaining symmetrical overall sound radiation.
2Reliability
If the supporting system stiffness is increased to improve low-frequency reproduction, then the resonant frequency increases, but distortion increases due to nonlinearity
Solution Approach 1:
The patent optimizes the parameters of the supporting system, specifically designing the edge shape (such as rolled edges with specific curvature radii) and stiffness characteristics. By carefully controlling the curvature radius of rolled edges and the overall stiffness of the supporting structure, the system achieves low resonant frequency while minimizing nonlinearity-induced distortion.
Solution Approach 2:
The patent employs curved edge shapes, particularly rolled edges with specific curvature radii, in the passive radiator design. This curvature allows the supporting system to maintain flexibility and low stiffness for low-frequency reproduction while the symmetrical curvature ensures linear supporting force, reducing distortion.
3Stability of the object's composition
If roll edges are used to support the passive radiator, then the linearity of supporting force is improved, but asymmetrical distortion is generated due to different air displacements
Solution Approach 1:
The patent converts the harmful asymmetrical distortion generated by roll edges into a beneficial effect. By using multiple passive radiators with roll edges that face each other, the asymmetrical distortion components generated by each radiator cancel each other out, while the linear supporting force characteristic of roll edges is maintained.
Solution Approach 2:
The patent deliberately utilizes the asymmetrical nature of roll edges to generate specific distortion components. By positioning multiple such radiators symmetrically in the cabinet, the asymmetrical distortions cancel each other, while the overall symmetrical sound radiation pattern is maintained.
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 effectively cancels distortion components irrespective of the listener's position, resulting in low-frequency sound reproduction with reduced distortion and improved low-frequency sound reproduction capabilities.
Implementation Method 1
The pressure of the radiated sound vibrates the first passive radiator 3 and the second passive radiator 4 acoustically coupled via the space 5, so that a sound is radiated to an external space outside the cabinet 1
Implementation Method 2
distortion components of sound pressures radiated from supporting systems 24, 27 of a plurality of passive radiators 22, 25 are canceled with each other
Data Source
AI summary
A speaker system of the present invention comprises a cabinet, at least one speaker unit attached to the cabinet, and a plurality of passive radiators attached to the cabinet and each including a diaphragm and a supporting system supporting the diaphragm. The speaker system of the present invention is configured so that distortion components of sound pressures radiated from the supporting systems of the plurality of passive radiators are canceled with each other, and sounds radiated by the plurality of passive radiators are radiated in substantially the same direction from the cabinet.