选频及信号波形的变换.docVIP

摘要 各种电器设备要正常工作，常常需要各种波形信号的支持。电器设备中常用的信号有正弦波、矩形波、三角波和锯齿波等。在电器设备中，这些信号是由波形产生和变换电路来提供的。 在科学研究、工程教育及生产实践中，如工业过程控制、教学实验、机械振动试验、动态分析、材料试验、生物医学等领域，常常需要用到。在我们常生活中，以及一些科学研究中，锯齿波和正弦波、矩形波信号是常用的基本测试信号。譬如在示波器、电视机等仪器中，Abstract A variety of electrical equipment to work, often need the support of various waveform signals. Electrical equipment commonly used in signal has sine, rectangle, triangle and sawtooth and so on. In electrical equipment, these signals are generated by the waveform and the converter circuit to provide. In scientific research, engineering education and production practice, such as industrial process control, teaching experiment, mechanical vibration, dynamic analysis, materials testing, biomedical and other fields, the Fourier decomposition of periodic signal circuit analysis in our great The significance and role, and often need to use selected frequency, wave conversion and other basic circuit analysis. In our daily life, and some scientific research, sawtooth and sine wave, square wave signal is commonly used in the basic test signal. For example, in oscilloscopes, television sets and other instruments, are such common signals. Therefore, the analysis of periodic signal and to select the requirements of fixed frequency, and according to requirements of the subject into the fixed waveforms we require periodic signal. First, the signal generator output with a sawtooth signal, according to periodic signals of different frequencies can be said that the weighted sum of sinusoidal signals. So we can decompose the signal into the familiar cycle of sinusoidal signals. By RC sine wave oscillator circuit, to select the frequency of the signal we need to complete the required frequency selection. Finally, Schmitt trigger 555 to constitute the signal transformation, with an oscilloscope to observe the final output signal. The use of Multisim circuit design process to the specific simulation, the simulation process the input signal on the oscilloscope and set the appr