Audio Gain Control Circuit for Variable Supply Voltage
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Solution Overview
Problem
Conventional audio amplifiers face distortion and incorrect signal levels due to varying output voltages, as the gain ratio is typically set as a constant value and not adjusted accordingly with changes in power source voltage, especially in handheld devices.
Innovation Solution
A gain adjustment device and method that automatically adjusts the voltage gain based on the ratio of amplified signal voltage to original signal voltage, using a combination of processing modules, gain control modules, and voltage detection circuits to generate a gain control signal, allowing for real-time adjustment of the gain without user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the gain ratio is set as a constant value, then the device complexity is reduced, but the signal level accuracy deteriorates when power source voltage varies
Solution Approach 1:
The patent implements a feedback mechanism where the actual output signal level is detected and fed back to the gain adjustment circuit. This feedback loop enables the system to automatically correct gain deviations caused by power source voltage variations, thereby maintaining signal level accuracy without requiring complex manual adjustment mechanisms.
Solution Approach 2:
The gain adjustment circuit is designed to automatically adjust the gain based on detected signal levels without requiring external control or user intervention. The system serves itself by using internal detection and control mechanisms to maintain proper signal levels despite power source variations.
2Measurement precision
If the gain ratio is adjusted dynamically to maintain signal level accuracy, then the signal level accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent combines the gain adjustment function with the existing audio signal processing path by integrating the gain adjustment circuit directly into the signal flow between the audio amplifier and subsequent processing stages. This merging approach allows dynamic gain adjustment without adding separate complex control systems.
Solution Approach 2:
The gain adjustment circuit is designed to work with varying power source voltages and automatically adapt to different operating conditions. It serves multiple functions including gain control, signal level normalization, and compensation for power source variations, thereby reducing the need for separate dedicated circuits for each function.
3Ease of operation
If manual gain setting is used, then the ease of operation is improved, but the adaptability to power source voltage changes deteriorates
Solution Approach 1:
The system automatically detects power source voltage variations and adjusts the gain accordingly without requiring user intervention. The gain adjustment circuit monitors the power source voltage and self-adjusts to maintain proper signal levels, eliminating the need for manual recalibration when power sources change.
Solution Approach 2:
The patent implements a feedback mechanism where the actual output signal level is detected and fed back to the gain adjustment circuit. This feedback loop enables the system to automatically correct gain deviations caused by power source voltage variations, thereby maintaining signal level accuracy without requiring complex manual adjustment mechanisms.
Data Source
AI summary
A gain adjustment device and a method thereof are provided. The device includes a first processing module, a gain adjustment circuit, a second processing module, and a gain control module. The first processing module receives an input signal and generates a first signal. An operating voltage of the first processing module is a first voltage. The gain adjustment circuit receives the first signal and adjusts a gain of the first signal according to a gain control signal to output a third signal. The second processing module receives the third signal and generates a second signal. An operating voltage of the second processing module is a second voltage. The gain control module generates the gain control signal according to the first voltage and the second voltage.