Keyboard Speaker Duct Layout for Low-Note Interference Control
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Solution Overview
Problem
Reducing the size of an electronic keyboard instrument's casing leads to interference between sound waves emitted from the front and rear surfaces of the speaker, deteriorating the tone in the low-pitched sound range.
Innovation Solution
A sound emitting apparatus with a receiving frame and sound emitting element forming a storage space, an acoustic space, and a duct, aligned in a left-right direction, and a port positioned to minimize interference by allowing for smooth air vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the size of the casing is reduced, then portability and storage convenience are improved, but the tone of low-pitched sounds deteriorates due to interference between sound waves from the front and rear surfaces of the speaker
Solution Approach 1:
A duct is introduced as an intermediary component between the speaker and the external environment. The duct guides sound waves from the speaker's rear surface through a controlled path, allowing them to exit separately from the front surface emissions. This mediator structure enables the rear surface sound waves to be directed away from the front surface, eliminating interference while maintaining a compact casing design.
2Volume of moving object
If the size of the casing is reduced, then storage space requirements are reduced, but the tone of low-pitched sounds deteriorates due to interference between sound waves
Solution Approach 1:
The sound emission path is segmented into separate channels: one for front surface emissions and another through the duct for rear surface emissions. By dividing the sound wave paths, the patent allows the compact casing to accommodate separate emission zones, preventing interference between low-pitched sound waves while maintaining reduced overall volume.
3Object-affected harmful factors
If the duct is positioned to minimize interference, then sound quality is improved, but the structural complexity increases
Solution Approach 1:
The duct is strategically positioned at specific locations on the receiving frame where it can effectively guide sound waves away from interference zones. By concentrating the duct structure at optimal positions rather than throughout the entire assembly, the patent achieves phase-related interference suppression while minimizing the addition of structural complexity.
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
Enhances the reproduction of low notes while reducing the instrument's size by suppressing phase-related interference and improving sound quality through a resonating effect.
Implementation Method 1
improving sound quality through a resonating effect
Implementation Method 2
suppressing phase-related interference
Data Source
AI summary
A sound emitting apparatus includes a receiving frame in a shape of a box that open at a top and a sound emitting element disposed on the receiving frame and formed integrally, and the receiving frame and the sound emitting element together form a storage space for housing a speaker, an acoustic space connected to the storage space, and a duct connected to the storage space, and the acoustic space constitutes a space corresponding to an area including multiple lower bosses configured to fix the receiving frame and the sound emitting element together, provided to be aligned in a left-right direction, and protruding in an upward direction, and the receiving frame comprises a port that is open at a position corresponding to the duct.