Audio Output Gain Control for Varying Sound Source Impedance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing information processing apparatuses fail to adequately adjust voice signal output levels based on the varying impedance of different sound sources, leading to inconsistent volume levels and potential discomfort in public settings.
Innovation Solution
The apparatus includes a controller that measures the output level of a test signal when a sound source is connected, determining the output gain of the voice signal based on the sound source's impedance, rated power consumption, and internal resistance to adjust the volume accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the information processing apparatus outputs voice signal to different sound sources with varying impedance, then the voice can be presented to users, but the output level becomes inconsistent across different sound sources
Solution Approach 1:
The system automatically adjusts the output gain parameter based on the detected impedance of the connected sound source. By measuring the impedance and selecting an appropriate gain value from a predetermined table, the system maintains consistent output levels across different sound sources with varying impedance characteristics
Solution Approach 2:
The system performs impedance detection to acquire feedback information about the connected sound source characteristics. Based on this feedback, the system automatically adjusts the output gain to achieve optimal and consistent output levels, creating a closed-loop control system
2Measurement precision
If the output gain is increased to compensate for high impedance sound sources, then the output level improves, but excessive voltage may damage the sound source
Solution Approach 1:
The system performs impedance detection and gain adjustment before actual voice output. By preliminarily determining the appropriate gain value based on detected impedance, the system ensures optimal output level while preventing excessive voltage that could damage the sound source
Solution Approach 2:
The impedance detection mechanism acts as an intermediary between the audio output and the sound source. It provides critical information about the sound source characteristics, enabling the system to select an appropriate gain value that balances output level and safety
Data Source
AI summary
An information processing apparatus includes: a controller; and an audio system. The controller is configured to, when connection between the audio system and a sound source is detected, measure an output level of a test signal output to the sound source, and determine an output gain of a voice signal output from the audio system to the sound source based on the output level.