Concentric Phasing Plug Adaptor for Midrange Frequency Response
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Solution Overview
Problem
Horn-loaded compression drivers face challenges in achieving optimal sound transformation and frequency response due to limitations in phasing plug design, particularly in midrange sound frequencies, leading to poor performance characteristics and audible irregularities.
Innovation Solution
A phasing plug adaptor with concentric rings and channels is introduced, featuring a flange and a body with tapered surfaces and varying exit and entry apertures to enhance sound dispersion and equalize path lengths, improving acoustic wave propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional phasing plug is used in horn-loaded compression drivers, then the acoustic path compresses audio signals and equalizes path lengths, but the transformation of acoustic signals from compression driver to horn is incomplete, resulting in poor frequency response characteristics and restricted bandwidth
Solution Approach 1:
The phasing plug is divided into multiple segmented elements arranged in a specific pattern. This segmentation allows different portions of the acoustic signal to travel through different path lengths and then recombine, achieving complete transformation of acoustic signals across a broader frequency range and improving frequency response characteristics without restricting bandwidth.
Solution Approach 2:
Different regions of the phasing plug are designed with locally optimized properties - certain areas have specific acoustic impedance characteristics or path length variations tailored to handle specific frequency ranges. This local quality optimization enables the single phasing plug structure to effectively manage the full spectrum of acoustic signals, expanding bandwidth while maintaining reliable frequency response.
2Device complexity
If a traditional phasing plug is used, then the structure is simple, but audible response irregularities such as horn midrange sound occur due to non-ideal area expansions
Solution Approach 1:
The segmented design of the phasing plug creates multiple acoustic paths with carefully controlled area expansions and contractions. This segmentation allows for progressive acoustic transformation that avoids sudden impedance changes, thereby eliminating audible response irregularities like horn midrange sound while keeping the overall structural complexity manageable through modular segmentation.
Solution Approach 2:
The phasing plug incorporates curved or tapered surfaces rather than abrupt geometric transitions. These curved geometries create gradual area expansions that smooth acoustic impedance transitions, preventing the formation of standing waves and resonant irregularities in the midrange frequencies, thus eliminating harmful audible artifacts.
3Ease of operation
If the phasing plug is positioned adjacent to the diaphragm with sufficient space, then the diaphragm vibration is not interfered with, but the acoustic signal transformation remains incomplete
Solution Approach 1:
The segmented phasing plug structure is positioned to work in conjunction with the diaphragm's natural vibration pattern. The segments are arranged and dimensioned so that they begin processing the acoustic signal after the diaphragm has established its vibration, thus not interfering with diaphragm operation while still achieving complete acoustic transformation through the segmented acoustic paths.
Solution Approach 2:
The phasing plug segments are pre-configured with specific path lengths and acoustic impedances that prepare the acoustic signal for optimal transformation. This preliminary configuration of acoustic paths ensures that when the diaphragm vibrates, the signal is immediately and effectively transformed through the segmented structure, achieving complete signal transformation without requiring the plug to be positioned close to the diaphragm.
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 adaptor enhances sound dispersion and directivity, reducing interference and distortion, resulting in improved frequency response and increased sound pressure levels.
Implementation Method 1
The phasing plug typically has circumferential slits, radial slits, or holes that form an acoustic path for transfer of the sound energy from the compression driver to the horn. This acoustic path compresses audio signals from the compression driver and equalizes path lengths of the sound waves to reduce out of phase and destructive interference.
Implementation Method 2
A phasing plug adaptor with concentric rings and channels is introduced, featuring a flange and a body with tapered surfaces and varying exit and entry apertures to enhance sound dispersion and equalize path lengths, improving acoustic wave propagation.
Implementation Method 3
This acoustic path compresses audio signals from the compression driver and equalizes path lengths of the sound waves
Data Source
AI summary
A phasing plug adaptor for a speaker assembly includes a plurality of concentric rings. An innermost ring defines a channel that is uninterrupted and coaxial with a longitudinal axis.