Speaker Guide Path Layout to Reduce Vent-Hole Howling
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Solution Overview
Problem
Existing electronic devices with speakers experience discomfort and audio feedback issues due to the emission of sound through a vent hole, leading to howling when the device is worn, as the sound from the speaker surfaces is not effectively managed.
Innovation Solution
The electronic device incorporates a guide part within the housing that extends along the side surface of the speaker, creating a second audio path between the housing and the guide part, which separates the sound emission from the main audio path, guiding sound from the second speaker surface to a vent hole, thereby reducing interference and feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sound is emitted directly through a vent hole from the speaker surface, then the audio output is simple and direct, but it causes howling and audio feedback when the device is worn
Solution Approach 1:
The patent introduces a secondary audio path that extends in a different spatial dimension from the main audio path. The guide part creates a lateral extension that directs sound from the second speaker surface through a vent hole positioned away from the main audio output, effectively using spatial separation to eliminate feedback while maintaining audio output functionality
Solution Approach 2:
The audio output system is segmented into two distinct paths: a main audio path for primary sound output and a second audio path through the guide part for secondary sound emission. This segmentation allows different portions of the speaker output to be directed through separate routes, preventing the reinforcement of feedback loops that cause howling
2Object-generated harmful factors
If a guide part is added to create a second audio path, then howling is reduced by increasing sound path length, but the device structure becomes more complex
Solution Approach 1:
The guide part is integrated with the existing housing structure rather than being a separate component. The guide part extends from the housing and incorporates the vent hole as part of its structure, merging the sound guidance function with the housing itself to minimize additional complexity while achieving howling reduction
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 effectively reduces the occurrence of howling by increasing the path length for sound emitted from the second speaker surface, minimizing the sound received by the microphone and enhancing user comfort.
Implementation Method 1
a second audio path extending from the gap to the vent hole such that audio from the second surface passing through the gap is emitted to the vent hole
Data Source
AI summary
An electronic device is provided. The electronic device includes at least one speaker including a first surface, a second surface opposite to the first surface, and a side surface connecting the first surface and the second surface, a housing accommodating the at least one speaker, the housing including a first audio path extending from the first surface toward an exterior of the electronic device such that audio from the first surface is emitted to the exterior of the electronic device, and a vent hole separated from the first audio path, a guide part extending along at least a portion of the side surface within the housing, the guide part including a first portion contacting the housing, and a second portion spaced apart from the housing by a gap, and a second audio path extending from the gap to the vent hole such that audio from the second surface passing through the gap is emitted to the vent hole, wherein the second audio path is located between the housing and an outer surface of the guide part opposite to an inner surface of the guide part facing at least a portion of the side surface.