摘要
来电显示的核心部分就是对来电显示信号即FSK信号的解调。现在常用的FSK解调算法主要是通过频谱分析进行解调 ,在解调精度上难以达到要求且计算量很大 ,所以本文介绍了一种新型FSK解调算法 ,该算法是基于最小均方差准则的线性预测检测算法 ,它利用FSK信号的高度相关性来检测FSK信号 ,通过比较线性预测残余信号的大小来检测FSK信号。实践表明该在算法能在极低的信噪比环境下快速准确的解调FSK信号 ,非常适用于来电显示。本文还介绍了TI公司的TMS32 0C5 4 0 2DSP芯片以及来电显示在该芯片上的实现。
The core of Caller ID detection is demodulation of the FSK signal. The common used FSK demodulation algorithm demodulates the FSK signal by spectrum analysis. This precision of demodulation is not up to standard and the compute complexity is high. This paper introduces a new FSK demodulation algorithm,this algorithm is a linear prediction algorithm based on least mean square,it demodulates the FSK signal by comparing the residual of linear prediction and it can demodulate the FSK signal quickly and exactly in very noisy environment. This paper also introduce the implementation of Caller ID detection in the TMS320c5402 DSP chip.
出处
《电子器件》
CAS
2004年第2期320-323,共4页
Chinese Journal of Electron Devices
关键词
来电显示
移频键控
DSP
Caller ID(Identity Delivery) detection
Frequency shift key(FSK)
DSP
