Low-Frequency Audio Processing Across User Volume Levels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for improving sound reproduction at low frequencies, such as those below 150 Hz, fail to optimize dynamics and bandwidth as a function of volume, leading to lost dynamics at low levels and potential speaker damage at high levels.
Innovation Solution
A method and system that vary multiple audio signal parameters, including compression rate, release time, attack time, return time, threshold, and gain compensation, as well as high-pass filter characteristics, in response to user-selected volume levels to enhance low-frequency sound rendering without harming the reproduction system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If static gain adjustment is used to improve low-frequency sound reproduction, then the simplicity of the system is maintained, but the dynamics and bandwidth of the audio signal are not optimized across different volume levels
Solution Approach 1:
The patent applies dynamics by making the audio processing system adaptive to different volume levels. Multiple parameters (compression ratio, release time, attack time, threshold, gain compensation, and high-pass filter characteristics) are dynamically adjusted based on the selected volume step, transforming a static system into one that optimizes low-frequency reproduction characteristics for each volume condition.
Solution Approach 2:
The patent implements parameter changes by varying multiple audio signal processing parameters according to the volume step. The compression ratio, time constants, threshold levels, and filter characteristics are all modified based on volume, enabling the system to optimize dynamics and bandwidth adaptively without requiring complex real-time analysis.
2Reliability
If low-frequency gain is increased to improve dynamics at low volume levels, then the perception of bass is enhanced, but the power handling of the reproduction system may be compromised at high volume levels
Solution Approach 1:
The patent applies local quality by implementing different processing characteristics for different volume levels. At low volume levels, the system enhances dynamics and bass perception through optimized parameter settings, while at high volume levels, it transitions to protection-oriented settings that preserve power handling margins. Each volume step receives customized parameter optimization tailored to its specific requirements.
Solution Approach 2:
The system dynamically switches between enhancement mode (low volume) and protection mode (high volume) by adjusting multiple parameters based on the selected volume step. This dynamic adaptation allows the system to optimize bass perception when needed while automatically protecting the reproduction system when operating at high power levels.
3Reliability
If multiple parameters are varied to optimize low-frequency rendering, then the sound quality across volume range is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the volume range into discrete steps, with each step having pre-optimized parameter settings. This segmentation approach allows complex multi-parameter optimization to be implemented through a manageable structure where parameters are adjusted in coordinated groups corresponding to each volume step, making the complexity tractable through systematic organization.
Data Source
Figure 1
AI summary
The present invention relates to a method for optimizing the low-frequency sound rendition of an audio signal, implementing variations in a plurality of parameters (Ρ1, P2, P3, PN) of said audio signal according to the volume level (V1, V2, VP) of said signal chosen by a user, in particular filtering or compression parameters, or parameters relating to the harmonics of said audio signal, while seeking to optimize the dynamics and the bandwidth of said audio signal according to the volume, in order to provide an optimal rendition to the user. The present invention also relates to a system for optimizing the low-frequency sound rendition of an audio signal.