Volume-Dependent AGC Tuning for Natural Audio Level Transitions
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Solution Overview
Problem
Existing automatic gain control systems in electronic devices often fail to adjust gain based on user-defined volume settings, leading to unnatural sounding audio output, particularly during transitions between quiet and loud signals.
Innovation Solution
A computer-implemented method that adjusts operational parameters of an automatic gain control unit based on user-defined volume settings, allowing for volume-dependent gain adjustment to generate an audio output signal at a desired level, with parameters such as maximum gain and amplification levels being set or modified accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic gain control adjusts gain independently of volume settings, then the system maintains consistent amplification behavior, but the audio output becomes unnatural particularly during transitions between quiet and loud signals
Solution Approach 1:
The patent applies dynamics by making the automatic gain control system adaptive to volume settings. The operational parameters of the AGC unit are dynamically adjusted based on the current volume setting, allowing the system to transition from static to dynamic behavior. This enables the AGC to provide aggressive gain adjustment at high volumes while being more conservative at low volumes, naturally preventing audio spikes and pulsing.
Solution Approach 2:
The patent changes operational parameters of the automatic gain control unit based on volume settings. Specifically, the maximum gain parameter and other operational parameters are modified according to the volume setting, allowing the AGC behavior to adapt to different operating conditions. This parameter adaptation resolves the contradiction by enabling natural-sounding audio output across different volume levels while maintaining reliable amplification.
2Power
If aggressive gain adjustment is applied to ensure high gain at higher volumes, then sufficient amplification is achieved, but audio spikes and pulsing occur at lower volumes
Solution Approach 1:
The patent applies local quality by tailoring the AGC behavior to specific volume settings. Different operational parameters are applied locally according to the volume level - aggressive gain adjustment is used when volume is high, while more conservative parameters are used when volume is low. This localized parameter adaptation prevents audio spikes and pulsing at low volumes while ensuring sufficient amplification at high volumes.
Solution Approach 2:
The system dynamically adjusts the aggressiveness of gain adjustment based on the current volume setting. The operational parameters are not fixed but change dynamically with volume, allowing the system to optimize between providing sufficient gain and preventing audio artifacts. This dynamic adaptation eliminates the harmful effects across different operating conditions.
Data Source
AI summary
A computer-implemented method to generate an audio output signal is disclosed. The method may include receiving an audio input signal at an automatic gain control (AGC) unit. The method may further include receiving a volume setting indicator signal at the AGC unit. Further, the method may include setting one or more operational parameters for the AGC unit based on the volume setting indicator signal. In addition, the method may include applying a gain to the audio input signal based on the one or more operational parameters to generate an audio output signal at a desired output level.