基于MSP430F499的波形合成器

Waveshaper system based on MSP430F499

以MSP430F499为核心,主要由方波振荡电路、分频与滤波模块、移相电路、放大电路、加法器等组成。将方波振荡器的信号分频滤波产生不同频率的正弦波,经移相放大等处理后,分别根据方波三角波谐波组成关系,再合成方波和三角波。滤波模块对同一信号进行二次滤波,先用开关电容滤波器滤波,再经三阶巴特沃斯低通滤波器滤波,降低了高次谐波对信号的影响同时保证了通带内信号的平坦。可通过按键进行波形切换以及合成阶数切换,人机交互灵活,界面友好,操作简单。

This waveshaper system centered on MSP430F449,it consists mainly of square wave oscillator circuit,frequency dividing circuit,filter circuit,phase-shift circuit,amplifying circuit and summer.As soon as the signal from square wave oscillator is divided and filtered,different frequency sine wave will produce.After sine wave＇s phase is shifted,square wave and triangular wave can be composed which is based on the composition link of square wave＇s and triangular wave＇s harmonic.In order to reduce the influence of higher haimonic on signal and guarantee the smoothness in pass band,the same signal is filtered twice.First,the signal is filtered by switch capacitance filter,then by third-order bart leavenworth low-pass filter.The system uses buttons for waveform switching and synthetic order switching.The system has the advantage of flexible human-computer interaction,friendly interface and simple operation.