基于正交抽取的通用信号算法分析架构

A General Signal Analysis Algorithmic Struct Based on Orthogonal Sampling

为克服基于外差式接收机原理的模拟监测仪的非线性、温度特性不理想和AGC电路改变调幅度等缺点,文章引入基于DSP的数字化调幅广播监测仪结构,采用正交抽取的通用信号算法分析架构,完成A/D采样后信号的变频、速率匹配、滤波和特征提取等工作,极大简化后续DSP信号处理过程,滤出噪声,提高系统测量精度;以AM信号解调为例,给出仿真结果,表明该正交抽取架构可精确解调出调制度和音频电压等指标,经过数字化处理之后,监测仪具有良好的温度特性、线性度。

To overcome the shortcomings of simulated supervised instrument such as non-linear,difference of temperature characteristics and modulation amplitude changing cause of AGC circuit which are due to adopting the principle of superheterodyne receiver,This paper presents a digital amplitude-modulation broadcasting supervised struct,which completes frequency downconvertering from ADC to baseband,speed matching,filtering and feature extracting by general signal analysis.algorithmic of orthogonal sampling struct based on DSP.It greatly simplifies the following work such as DSP signal processing,noise filtering,and finally improves the system measurement precision.This paper offers an example of AM signal demodulation,gives the emulated result,and Indicates fact that the struct of orthogonal sampling can exactly demodulate and calculate the result such as depth,audio voltage and so on.It proves that the supervised instrument has better temperature characteristics and linearity according to digital processing.