Low-Frequency Audio Adjustment for Consistent Bass in Small Speakers
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Solution Overview
Problem
Small speaker devices often lack richness in low-frequency sound (bass) when switching audio sources, such as from a portable player to a networked server, due to inconsistent volume control and processing limitations.
Innovation Solution
An audio device with a first detector to adjust the volume of low-frequency components in audio signals, using a signal processor and low-frequency component adjuster to generate a second audio signal with enhanced bass, by employing a high-pass filter or band-elimination filter based on detected volume levels, ensuring consistent bass richness regardless of the audio source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small speaker device is used to save space, then the device size is reduced, but the low-frequency sound quality deteriorates
Solution Approach 1:
The patent dynamically changes the equalizer parameters (specifically the Q factor and gain) based on the detected audio signal volume. When volume is low, the equalizer applies stronger bass enhancement with higher Q and gain values. When volume is high, the equalizer reduces bass enhancement to prevent distortion. This allows a small speaker to maintain good bass quality across different volume levels.
Solution Approach 2:
The patent introduces dynamic adjustment of equalizer characteristics based on real-time volume detection. The system transitions from static equalizer settings to dynamic settings that adapt to changing audio conditions, allowing the small speaker to optimize bass response for each volume level rather than being constrained by fixed parameters.
2Manufacturing precision
If a fixed equalizer setting is used to enhance bass, then low-frequency sound quality improves, but adaptability to different audio sources deteriorates
Solution Approach 1:
The patent makes the equalizer settings dynamic by linking them to the detected audio volume level. Instead of a fixed equalizer curve, the system adjusts the equalizer parameters (Q factor and gain) based on real-time volume detection, allowing optimal bass enhancement for each audio source and volume level.
Solution Approach 2:
The patent implements a feedback mechanism where the audio signal volume is continuously detected and used to adjust the equalizer parameters. The volume detector provides feedback to the equalizer control, creating a closed-loop system that automatically adapts bass enhancement to the current audio conditions, ensuring consistent quality across different audio sources.
3Power
If volume is increased to compensate for poor bass, then sound output level improves, but bass richness deteriorates due to distortion
Solution Approach 1:
The patent changes the equalizer parameters (Q factor and gain) based on the detected audio volume. At low volumes, the equalizer applies stronger bass enhancement with higher Q and gain values to compensate for the small speaker's limited bass capability. At high volumes, the equalizer reduces bass enhancement to prevent distortion, maintaining clean sound output without sacrificing bass richness.
Data Source
AI summary
An audio device includes: a first detector configured to detect a volume of a first audio signal; and a low-frequency component adjuster configured to generate a second audio signal in which a level of a low-frequency component of the first audio signal is adjusted based on the volume detected by the first detector.