Speaker System Resonance Segmentation
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Solution Overview
Problem
Conventional loudspeaker enclosures minimize resonance to maintain audio fidelity, but this process results in the loss of natural resonant tones during recording, leading to unnatural vocal reproduction, particularly in the 100 Hz to 1,400 Hz frequency range, causing echo and distortion.
Innovation Solution
The speaker system incorporates a highly resonant enclosure with a spruce soundboard for low and high-range drivers and a minimally resonant enclosure for the mid-range driver, allowing specific reintroduction of resonant tones to enhance the audio experience, mimicking the resonance of stringed instruments while maintaining vocal clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resonance is minimized in loudspeaker enclosures to maintain audio fidelity, then audio fidelity is improved, but natural resonant tones are lost resulting in unnatural vocal reproduction
Solution Approach 1:
The speaker system divides the audio frequency spectrum into distinct segments handled by different drivers and enclosures: low-frequency driver (20-200Hz) in a resonant enclosure with soundboard, mid-range driver (200-2000Hz) in a minimally resonant enclosure, and high-frequency driver (2000-20000Hz) in a resonant enclosure. This segmentation allows selective application of resonance enhancement to specific frequency bands, preserving natural resonant tones in instrument ranges while maintaining vocal clarity in the mid-range.
Solution Approach 2:
Different portions of the speaker system are given different resonance characteristics tailored to their function. The low-frequency and high-frequency enclosures are designed to be highly resonant with spruce soundboards to enhance instrument tones, while the mid-range enclosure is designed to be minimally resonant to preserve natural vocal reproduction. This local differentiation resolves the contradiction by applying resonance enhancement only where it benefits the audio output.
2Loss of information
If a soundboard is incorporated into the loudspeaker enclosure to enhance resonance, then natural resonant tones are restored, but vocal distortion and echo increase in the 100 Hz to 1,400 Hz range
Solution Approach 1:
The system segments the frequency spectrum and assigns different enclosure resonance characteristics to different segments. The mid-range frequency band (200-2000Hz) containing vocals is isolated in a minimally resonant enclosure, preventing vocal distortion and echo. Meanwhile, other frequency bands benefit from resonance enhancement in their respective enclosures with soundboards.
Solution Approach 2:
The mid-range enclosure is specifically designed with minimal resonance characteristics to protect vocal frequencies from distortion, while other enclosures in the system are designed with high resonance characteristics to enhance instrument tones. This localized quality differentiation allows the system to avoid vocal distortion while still restoring natural resonant tones elsewhere.
3Device complexity
If the same enclosure is used for all frequency ranges, then device complexity is reduced, but the ability to selectively enhance resonance in specific frequency ranges is lost
Solution Approach 1:
The speaker system is divided into three separate enclosures, each optimized for specific frequency ranges with appropriate resonance characteristics. This segmentation enables selective resonance enhancement in low and high frequency ranges while maintaining vocal clarity in the mid-range, achieving adaptability without excessive complexity.
Solution Approach 2:
Each enclosure is designed to handle multiple functions within its frequency range: the resonant enclosures with soundboards provide both bass response and resonant tone enhancement for instruments, while the minimally resonant mid-range enclosure provides clean vocal reproduction. This multi-functionality justifies the multi-enclosure configuration.
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 increases the resonance of the sound system, particularly in the vocal range, making the audio more lifelike by reintroducing resonant tones typically lost in recording, thereby reducing vocal distortion and echo, resulting in a more realistic sound reproduction.
Implementation Method 1
the soundboard vibrates in accordance with the vibration primarily generated from backdraft sound waves of the larger, low frequency speaker drivers
Implementation Method 2
a first cabinet enclosure fitted with a soundboard made from thin material such as wood (e.g., spruce). The soundboard vibrates in accordance with the vibration primarily generated from backdraft sound waves
Data Source
AI summary
A free-standing, portable speaker system including (1) at least a first cabinet enclosure of a first size generally rectangular in shape and having six sides; wherein the at least first cabinet enclosure includes at least a first driver and at least a second driver; and a planar partition soundboard member; wherein the partition soundboard member is adapted for enhancing the quality of sound from said first cabinet enclosure; and (2) at least a third driver releasably attached to the first cabinet enclosure; wherein the at least third driver in combination with the at least first and second drivers enclosed in the at least first cabinet enclosure enhances the quality of sound from said speaker system.