Omni-directional Ported Speaker Duct Network for Friction Noise Reduction
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Solution Overview
Problem
Conventional ported speakers suffer from noise due to air friction in their ducts, which limits their low-frequency response and overall performance.
Innovation Solution
An omni-directional ported speaker design featuring a column-like structure with a first duct and multiple second ducts, arranged at specific angles, to disperse air and reduce friction, thereby enhancing low-frequency response and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single duct is used in a ported speaker, then the structure is simple, but air friction causes noise and limits low-frequency response
Solution Approach 1:
The single duct is divided into multiple ducts (first duct and second ducts) that branch from the cabinet interior. This segmentation reduces the air flow velocity in each individual duct, thereby reducing frictional noise and improving low-frequency response while maintaining overall structural simplicity
Solution Approach 2:
The duct system transitions from a single linear path to a multi-dimensional branching structure. The first duct extends along the cabinet's longitudinal axis while second ducts branch off at specific angles, creating a three-dimensional duct network that disperses air flow more efficiently and reduces friction
2Loss of energy
If the opening size is increased to reduce friction, then frictional loss decreases, but the cabinet structure becomes more complex
Solution Approach 1:
Instead of increasing the opening size of a single duct, the system segments the air flow into multiple smaller ducts. This maintains a compact cabinet structure while collectively providing sufficient opening area to reduce frictional loss across all ducts combined
Solution Approach 2:
The duct system provides different characteristics in different locations: the first duct handles main air flow along the cabinet length, while second ducts provide additional flow paths at specific angles. Each duct is optimized for its local position, reducing overall friction without requiring a uniformly large opening
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 design effectively disperses air to minimize frictional noise, improving low-frequency performance and providing better sound reproduction by optimizing the speaker's structural layout.
Implementation Method 1
The invention provides an omni-directional ported speaker which can disperse the air in a single duct to eliminate the noise caused by the air friction in the duct
Implementation Method 2
the opening of the ported speaker is usually of insufficient size, which causes frictional loss during operation and results in noise of the ported speaker
Implementation Method 3
A conventional driver of a speaker is operated by causing a voice coil of the speaker to vibrate, and move a cone of the speaker to reproduce sound pressure waves
Implementation Method 4
move a cone of the speaker to reproduce sound pressure waves to allow a user to hear the sound
Implementation Method 5
the driver is mounted in a cabinet for preventing acoustic short circuit by separating a front and rear sound field of the driver
Implementation Method 6
If the voice coil moves forward, the density of the air in front of the driver is increased, and air density behind the driver is reduced
Implementation Method 7
the length of the ducts can be elongated, and better low frequency response can be achieved
Implementation Method 8
Typical ported speaker has an opening 4 and a duct 6 for connecting the driver 2. When a ported speaker operates, the air flows in the duct quickly
Data Source
AI summary
An omni-directional ported speaker including a cabinet which has a space, a first opening, and a second opening, and a first cover member connected to the cabinet, where the space of the cabinet is for disposing a driver that includes a diaphragm portion disposed within and closing the second opening of the cabinet, where the first cover member has a first duct and a plurality of second ducts, and the first duct and each of the second ducts has two openings, one of the two openings of the first duct is coupled to one of the openings of the second ducts, and the other opening of the first duct is disposed proximate to the driving portion of the driver and the first duct is arranged along the direction from the first opening toward the second opening of the cabinet, and the other openings of the second ducts are arranged in the cover member, where the first duct and the second ducts delimit a first angle, and each of the second ducts delimit a second angle between adjacent second ducts.