Synchronous Carrier Signal Circuit for Audio Aliasing Reduction
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Solution Overview
Problem
Audio codec systems face design difficulty and cost increases due to the need for high-steepness anti-aliasing filters to eliminate signal aliasing, which complicates the design and increases costs.
Innovation Solution
A signal generation circuit comprising a switch module, voltage generation module, and signal generation module that generates a carrier signal with a frequency consistent with a frequency-divided signal, using control switches and voltage generation mechanisms to control voltage levels, thereby reducing aliasing interference by synchronizing signal frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an anti-aliasing filter with high filtering steepness is used before the analog-to-digital converter, then signal aliasing is eliminated, but the filter area increases and design difficulty increases
Solution Approach 1:
The patent extracts the anti-aliasing function from the traditional analog filter and relocates it to the digital domain. A frequency division module divides the clock signal to generate a frequency-divided signal, which is then compared with the original signal in a comparison module to detect aliasing. This digital approach replaces the complex high-steepness analog filter, eliminating signal aliasing while reducing design difficulty and filter area.
2Reliability
If an anti-aliasing filter with high filtering steepness is used before the analog-to-digital converter, then signal aliasing is eliminated, but the filter area increases and cost increases
Solution Approach 1:
The patent removes the bulky analog anti-aliasing filter from the circuit and replaces it with compact digital processing components. The frequency division module and comparison module occupy significantly less area than a high-steepness analog filter would require, while achieving the same aliasing elimination function through digital signal processing.
3Reliability
If an anti-aliasing filter with high filtering steepness is used, then signal aliasing is eliminated, but design cost increases
Solution Approach 1:
The patent replaces expensive high-steepness analog filters with inexpensive digital logic components. The frequency division module and comparison module can be implemented using standard digital circuits that are cheaper and easier to manufacture than precision analog filters, reducing overall design cost while maintaining aliasing elimination performance.
Data Source
AI summary
This disclosure relates to a signal generating circuit and an audio processing device. The circuit includes a switch module, a voltage producing module, and a signal generating module; the switch module is connected to the voltage producing module, including at least one control switch, and is used for receiving a frequency division signal. Based on the frequency division signal, the at least one control switch is turned on or turned off; the voltage producing module is separately connected to the switch module and the signal generating module and used for producing a first voltage and a second voltage. The at least one control switch controls the first voltage and the second voltage to change. The signal generating module is connected to the voltage producing module and used for generating a carrier signal with the same frequency as the frequency division signal according to the received first and second voltages.