Top-Plate Sound Emitting Unit for Uniform Horizontal Sound Field
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Solution Overview
Problem
Existing electronic musical instruments face issues with non-uniform amplitude frequency characteristics in the horizontal direction due to the placement of sound emitting units, leading to changes in sound quality when the player moves their head.
Innovation Solution
The sound emitting unit is positioned on the back surface of the top plate, incorporating a speaker driver and a tapered diffuser to guide sound waves in a direction along the back surface, ensuring uniform amplitude frequency characteristics across the horizontal plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sound emitting unit with a diffuser is provided at keyboard height, then sound emission is improved, but uniform amplitude frequency characteristics cannot be attained in horizontal direction and sound quality changes when player moves head
Solution Approach 1:
The patent moves the sound emitting unit from the horizontal plane (keyboard height) to the vertical dimension (suspended above the top plate). This dimensional transition allows sound to be emitted from a position that naturally distributes acoustic energy more uniformly across the horizontal listening area, eliminating the head-position-dependent sound quality issues of conventional designs.
Solution Approach 2:
Instead of placing the diffuser in front of the speaker at keyboard level, the patent inverts the arrangement by positioning the diffuser between the speaker and the top plate, with sound being emitted upward through the top plate. This inverted configuration reverses the traditional sound emission path and achieves superior horizontal uniformity.
2Power
If speaker is positioned in front of keyboard, then direct sound emission is achieved, but strong directivity in front direction causes non-uniform sound distribution
Solution Approach 1:
The top plate serves as an intermediary medium between the speaker driver and the listening environment. Sound waves generated by the speaker are transmitted through the top plate material, which acts as a diffusing surface. This intermediary approach converts the highly directional speaker output into omnidirectional sound radiation, achieving both efficient sound emission and uniform distribution.
Solution Approach 2:
The patent changes the 'acoustic color' or radiation pattern of the sound by using the top plate as a radiating surface. The top plate's material properties and geometry transform the narrow-beam speaker output into a broad, uniform sound field, effectively changing the directional characteristics from focused to dispersed.
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 maintains consistent sound quality by diffusing sound waves uniformly in all directions, preventing changes when the player moves their head and providing a spacious sound experience.
Implementation Method 1
a diffuser including a tapered shape and disposed on the speaker driver holding portion with a distal end portion of the diffuser facing the speaker driver, the diffuser being configured to guide a sound wave emitted from the speaker driver in a direction along the back surface of the top plate
Data Source
AI summary
An electronic musical instrument includes a sound emitting unit disposed on a back surface of a top plate. The sound emitting unit includes: a speaker driver holding portion configured to hold a speaker driver configured to emit sound toward the top plate; a diffuser including a tapered shape and disposed on the speaker driver holding portion with a distal end portion of the diffuser facing the speaker driver, the diffuser being configured to guide a sound wave emitted from the speaker driver in a direction along the back surface of the top plate; and an attachment portion configured to suspend the speaker driver holding portion and attached to the back surface of the top plate.