Peak-Controlled Audio Gain Circuit for Higher SNR
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Solution Overview
Problem
Existing audio processing circuits face challenges in improving signal-to-noise ratio (SNR) without increasing current and transistor size of the analog-to-digital converter (ADC), leading to higher power consumption and chip area.
Innovation Solution
An audio processing circuit comprising a first amplifier, processing circuit, ADC, peak value detection circuit, and control circuit, which dynamically adjusts gain values based on detected peak and zero-crossing points to optimize SNR without increasing ADC current or transistor size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the current and transistor size of the ADC are increased to improve SNR, then the signal-to-noise ratio is improved, but the power consumption and chip area increase
Solution Approach 1:
The patent applies preliminary action by performing amplification of the input signal before it enters the ADC. The first amplifier amplifies the input signal prior to conversion, ensuring that the ADC operates with an already-enhanced signal level, which improves SNR without requiring the ADC itself to have higher current or transistor size.
Solution Approach 2:
The patent introduces an intermediary element (the first amplifier) between the input signal source and the ADC. This amplifier acts as a mediator that boosts the signal level before conversion, allowing the ADC to maintain its original design parameters while achieving better overall SNR performance through the intermediate amplification stage.
2Measurement precision
If the current and transistor size of the ADC are increased to improve SNR, then the signal-to-noise ratio is improved, but the chip area increases
Solution Approach 1:
The patent applies preliminary action by performing amplification of the input signal before it enters the ADC. The first amplifier amplifies the input signal prior to conversion, ensuring that the ADC operates with an already-enhanced signal level, which improves SNR without requiring the ADC itself to have higher current or transistor size.
Solution Approach 2:
The patent introduces an intermediary element (the first amplifier) between the input signal source and the ADC. This amplifier acts as a mediator that boosts the signal level before conversion, allowing the ADC to maintain its original design parameters while achieving better overall SNR performance through the intermediate amplification stage.
Data Source
AI summary
An audio processing circuit includes a first amplifier, a processing circuit, an analog-to-digital converter, a peak value detection circuit, and a control circuit. The first amplifier receives a first input signal, and performs an amplification operation upon the first input signal to generate a first amplified input signal. The processing circuit processes the first amplified input signal to generate a processed signal. The analog-to-digital converter performs an analog-to-digital conversion operation upon the processed signal to generate a digital signal. The peak value detection circuit detects a peak value of the first amplified input signal, a peak value of the processed signal, or a peak value of the digital signal, in order to generate a peak value detection result. The control circuit controls a gain value of the first amplifier and a gain value of the processing circuit according to the peak value detection result.