Audio Rendering with Masking-Based Gain Control for Buzz Reduction
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Solution Overview
Problem
Embedded loudspeakers in electronic devices often produce low loudness and poor sound balance due to their small size, leading to over-stressing and artifacts like distortion or buzzing, and are also affected by vibrations from other components, which existing solutions fail to adequately address without compromising sound quality.
Innovation Solution
A method for audio rendering that dynamically adjusts the acoustic levels of frequency bands based on masking frequencies energy, using a correction factor to determine second acoustic level thresholds and apply reduction gains only when necessary, thereby minimizing the impact on sound quality and reducing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If amplifiers are used to compensate for low loudness, then loudness is improved, but distortion and buzzing artifacts occur due to over-stressing the loudspeakers
Solution Approach 1:
The system performs preliminary analysis of the audio signal to detect vibration-prone frequencies before they cause harmful artifacts. By identifying these frequencies in advance and applying preventive attenuation, the system avoids over-stressing the loudspeaker while maintaining loudness through alternative frequency compensation
Solution Approach 2:
The system uses feedback by analyzing the audio signal characteristics and dynamically adjusting frequency band attenuation based on detected vibration patterns. This closed-loop approach allows the system to maintain optimal loudness while preventing distortion by continuously monitoring and adapting to the audio content
2Object-generated harmful factors
If fixed reduction gain is applied to frequency bands to reduce vibrations, then vibration artifacts are reduced, but sound quality deteriorates
Solution Approach 1:
The system transitions from static fixed gain reduction to dynamic, content-adaptive attenuation. By continuously analyzing the audio signal and adjusting attenuation levels in real-time based on detected vibration characteristics, the system maintains sound quality while effectively reducing vibration artifacts
Solution Approach 2:
The system applies local quality by targeting specific frequency bands that exhibit vibration-prone characteristics rather than applying uniform attenuation across all frequencies. This selective approach preserves the quality of non-problematic frequency bands while correcting only the problematic ones
3Volume of moving object
If small loudspeakers are used to minimize device size, then device compactness is improved, but loudness and sound balance deteriorate
Solution Approach 1:
The system changes acoustic parameters by dynamically adjusting the attenuation characteristics of different frequency bands. This allows small loudspeakers to achieve better loudness and sound balance by compensating for their inherent limitations through intelligent frequency-dependent gain control rather than physical redesign
Data Source
AI summary
A method for audio rendering by an apparatus comprising at least one audio rendering device, the method comprising: extracting (S10) a plurality of frequency band components from an input audio signal; determining (S15) from the device frequency response and the plurality of extracted frequency band components at least one indicator representative of masking frequencies energy, masking frequencies corresponding to frequency bands that are above a frequency threshold; determining at least one correction factor (S16) from the indicator representative of masking frequencies energy; e) for each frequency band, determining a second acoustic level threshold (S20) by modifying (S17) with the correction factor a predetermined first acoustic level threshold associated with said frequency band, and determining a reduction gain from a comparison (S30) between an acoustic level of the extracted frequency band and the second acoustic level threshold associated to said extracted frequency band, and applying (S40) the reduction gain.