Adaptive Multi-Path Analog Front End for Low-Noise Path Switching
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Solution Overview
Problem
In multiple path signal processing systems, there is a tradeoff between allowing larger signal swing and low noise, and existing multipath ADCs/AFEs may introduce noise artifacts due to parameter changes, leading to suboptimal performance and increased power consumption.
Innovation Solution
A processing system with static and dynamic processing paths, where the controller selects the appropriate digital signal based on input signal characteristics, optimizing parameters for reduced noise and power consumption, and includes a mechanism to minimize transient effects and audio artifacts by switching between paths only after stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a dynamic processing path with adjustable parameters is used to optimize for different signal characteristics, then power consumption and noise are reduced, but transient effects and audio artifacts may occur during parameter changes
Solution Approach 1:
The system employs a dynamic processing path where parameters such as gain, bandwidth, and filter configuration can be adjusted based on the characteristics of the input signal. This allows the system to adapt to different signal conditions (e.g., speech vs. music) and optimize power consumption by activating only the necessary processing components for the current signal type.
Solution Approach 2:
The controller monitors signal characteristics and anticipates parameter change requirements before they become necessary. By detecting signal type changes in advance, the system can prepare parameter adjustments and execute them at optimal moments, preventing transient effects and audio artifacts that would occur with reactive parameter changes.
Solution Approach 3:
The system continuously monitors the input signal characteristics and uses this feedback to dynamically adjust processing path parameters. The controller compares current signal properties against predefined thresholds and patterns to determine when parameter changes are appropriate, ensuring that adjustments are made only when beneficial and not during transitions that would cause audible artifacts.
2Adaptability or versatility
If multiple processing paths are implemented to handle different signal types, then adaptability and signal quality are improved, but device complexity increases
Solution Approach 1:
The processing system is divided into distinct processing paths, each optimized for specific signal types (e.g., one path for speech, another for music). The controller segments the signal processing task by routing different input signals to appropriate processing paths based on detected signal characteristics, allowing each path to be simplified and specialized rather than requiring a single complex universal processor.
Solution Approach 2:
The controller serves as a universal management component that handles multiple processing paths and makes routing decisions based on signal characteristics. This multi-functional controller consolidates the complexity of managing multiple specialized paths into a single decision-making unit, reducing overall system complexity while maintaining high adaptability.
3Measurement precision
If parameter changes are made frequently to track signal variations, then signal quality optimization is improved, but noise artifacts and power consumption increase
Solution Approach 1:
The system skips unnecessary parameter changes by detecting sustained signal characteristics rather than reacting to every transient variation. When the controller identifies that a signal type has changed and will persist for a threshold duration, it executes the parameter change; otherwise, it skips the change to avoid generating noise artifacts from frequent, unnecessary adjustments.
Solution Approach 2:
Once parameters are optimized for a particular signal type, the system maintains those parameters continuously as long as the signal characteristics remain consistent. This continuous operation at stable parameters avoids the noise and power consumption associated with frequent parameter changes, while still maintaining optimal signal processing quality throughout the sustained signal type.
Data Source
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AI summary
In accordance with embodiments of the present disclosure, a processing system may include a plurality of processing paths and a controller. The plurality of processing paths may include a static processing path configured to generate a first digital signal based on an analog input signal and a dynamic processing path configured to generate a second digital signal based on the analog input signal, wherein a parameter of the dynamic processing path is determined based on a characteristic of the analog input signal. The controller may be configured to select the first digital signal as a digital output signal of the processing system when a change is occurring to the characteristic and select the second digital signal as the digital output signal in the absence of change occurring to the characteristic.