摘要
介绍了DTMF信号的组成方式,讨论了DTMF信号编码原理,分析了二阶数字正弦波振荡器产生音频信号的机理.采用TMS320LF2407芯片取代专用硬件芯片获取DTMF信号,利用CCS开发环境观察DTMF信号产生的整个过程,使得DTMF信号的产生变得准确、直观.测试结果表明,该设计方法不仅行之有效,而且具有成本低、便于灵活应用的优点.
The composition of the DTMF signal is introduced. Principles of the DTMF signal coding are discussed. The mechanism of the audio signal based on second order digital sinusoidal oscillators is analyzed. The DTMF signal is achieved by the chip TMS320LF2407 replacing dedicated hardware chip. The whole process of the DTMF signal generation is observed with CCS development environment, which makes the generation of the DTMF signal accurate and intuitive. The test result shows the advantages of the design, namely, effective performance, low cost and flexible application, thus having broad application prospects.
出处
《上海电力学院学报》
CAS
2010年第2期201-204,共4页
Journal of Shanghai University of Electric Power
基金
上海高校选拔培养优秀青年教师科研专项基金(Z-2006-56)
