Audio Processor Resonance Suppression via Frequency Power Redistribution
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Solution Overview
Problem
Sound reproduction apparatus often experiences vibrations and buzzing due to resonance in the cabinet or casing during audio playback, which existing solutions like vibration dampeners or reducing volume do not conveniently address for manufacturers and users.
Innovation Solution
An audio processor that identifies the resonant frequency of a cabinet using a vibration sensor and processes the audio signal to reduce power at the resonant frequency while increasing power at adjacent frequencies, thereby reducing or eliminating resonance-induced vibrations and maintaining overall audio signal power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vibration dampeners are fitted to reduce cabinet resonance, then vibration and buzzing are reduced, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces mechanical vibration dampeners with a digital signal processing system. The audio processor detects resonant frequencies and applies notch filtering to eliminate resonance-induced vibrations through electronic means rather than physical dampening materials, thereby reducing device complexity while maintaining vibration control effectiveness.
Solution Approach 2:
The patent changes the frequency parameters of the audio signal by identifying resonant frequencies and applying targeted attenuation at those specific frequency points. This parameter-based approach allows dynamic control of cabinet vibrations without adding physical components, resolving the contradiction between vibration reduction and device complexity.
2Object-affected harmful factors
If playback volume is turned down to reduce resonance, then cabinet vibration is reduced, but the sound quality and user experience deteriorate
Solution Approach 1:
The patent applies local quality by targeting only the specific resonant frequency components that cause cabinet vibration, rather than reducing the overall playback volume. The audio processor identifies and attenuates only the problematic frequency bands while preserving the rest of the audio spectrum, thus eliminating vibration without sacrificing sound quality or user experience.
Solution Approach 2:
The patent substitutes the mechanical approach of volume reduction with an electronic signal processing approach that selectively filters resonant frequencies. This allows the system to maintain high overall output power while removing only the specific frequency components that cause cabinet resonance, resolving the contradiction between vibration control and sound output power.
3Object-affected harmful factors
If resonance frequency power is reduced to eliminate buzzing, then cabinet vibration is reduced, but the total audio signal power decreases
Solution Approach 1:
The patent changes the frequency distribution parameters of the audio signal by applying notch filtering at resonant frequencies. The audio processor selectively reduces power only at the identified resonant frequency points while maintaining the total power of non-resonant frequency components, thus eliminating buzzing without significant loss of overall audio signal power.
Solution Approach 2:
The patent applies local quality by targeting specific frequency regions (resonant frequencies) for power reduction rather than uniformly reducing the entire audio signal spectrum. This localized approach ensures that only the problematic resonant components are attenuated, preserving the majority of the audio signal power and maintaining overall sound output quality.
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
Effectively eliminates resonance-induced vibrations and buzzing in sound reproduction apparatus while minimizing noticeable volume reduction, ensuring the total power of the output audio signal remains substantially the same as the input signal.
Implementation Method 1
the resonant frequency being identified using a vibration sensor which is attached to the cabinet in which the loudspeaker is mounted
Implementation Method 2
the processing of the input audio signal reduces the power of the input audio signal at a resonant audio frequency... the resonant frequency is a resonant frequency of a cabinet
Data Source
Figure 1
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AI summary
An audio signal (14) is received as an input at an audio processor (12). The audio processor (12) processes the input audio signal (12) to provide an audio signal to be output (16) to a loudspeaker. The processing of the input audio signal (12) reduces the power of the input audio signal (12) at a resonant audio frequency and increases the power of the input audio signal (12) at at least some other audio frequencies other than the resonant audio frequency.