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怎样在simulink中用模块把dsp输入的电压值转为转速值?



我是这样想的:通过外部速度计测出电机转速然后通过实验室的挂箱上的速度变换器转成电压,然后这个电压输入到dsp中,dsp与电脑连接,在simulink中通过一个模块把这个电压值再转换成转速,用作闭环控制输入。请问,怎样在matlab中把从dsp输入的电压值变为转速?