一种时间阈值自动调整的测频方法设计与实现

Design and implementation of the frequency measurement algorithm for automatically adjusting time threshold

由于多周期同步频率测量方法对测频率在低频段的范围有一定限制,提出了一种时间阈值自动调整的改进型多周期同步频率测量方法。当被测频率超出低频段测量范围时,该方法通过有规律地延长时间阈值,拓展了在低频段被测频率的范围。结合MSP430单片机丰富的硬件资源,解决了测频模块硬件实现中的频率范围超出判断、时间阈值自动延长等关键问题,提出了合理的解决方案,并对其进行了软硬件设计。经实验测试,该方法实现了频率的测量,并拓展了低频段频率测量的范围。

Due to the frequency measurement range limit of the multi-period synchronizing method in measuring frequency, the modified method of multi- period synchronous frequency measurement was proposed. This method could adjust time threshold regularly to expand its measurable range when the measured frequency exceeds its low range. Combined with the abundant hardware resources of MSP430 microcontroller, the key problems of hardware realization of the frequency measuring module was solved which is to expand the time threshold automatically when frequency is beyond range. The hardware and software were designed. The test results show that this method can measure frequency signal and expand the measurable range of low frequency.