基于DSP的数字振荡器及应用  

Application and Digital Oscillator Based on DSP

作　　者：郝小江[1] 石海霞[1] 

机构地区：[1]攀枝花学院电气信息工程学院,四川攀枝花617000

出　　处：《兵工自动化》2007年第8期70-71,84,共3页Ordnance Industry Automation

摘　　要：利用TMS320VC5402DSP中定时器和中断可产生正弦波和双音多频DTMF信号。其DTMF信号的8个频率,每对音频信号表示1个数字或符号。DSP用软件产生的2个正弦波叠加在一起后发送,解码时则采用改进Goertzerl算法,从频域搜索两个正弦波的存在。该DTMF编码器基于2个二阶数字正弦波振荡器产生行频和列频,向DSP装入相应的系数和初始条件。按叠代算法得到正弦序列输出,将2个输出叠加即可得到双音频的输出。Timer and interruption of TMS320VC5402 can generate Sinusoidal and DTMF signal. A DTMF signal consists of a sum of two tones with frequencies taken from 8 preassigned frequencies. Each pair of such tones represents a unique number or symbol. A pair of sinusoidal signals was generated by DSP chips. Use Goertzel algorithm for decoding of a DTMF signal identifies the two tones in that signal. Based on two second-order digital sinusoidal oscillator which generated two mutually exclusive groups of frequencies, the DTMF encoder input the corresponding coefficient and the initial conditions. The iterative algorithm can be used to obtain sinusoidal sequence. The sum of two sinusoidal sequences is the DTMF signal.

关 键 词：DSP 数字振荡器 定时器 DTMF 

分 类 号：TN752[电子电信—电路与系统]