The realization of direct digital synthesizer (DDS) by FPGA based on the principle of fraction division is introduced.

采用现场可编程门阵列（FPGA）基于小数分频器的原理，实现直接数字式频率合成器（DDS）。

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But we don't normally write hours with decimal points. Floor division returns the integer number of hours, dropping the fraction part.

不过一般咱们不写有小数的小时数。地板除法返回的就是整的小时数，舍弃掉小数位。

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The paper uses cyclic division algorithm and opening-up-memory data storage to realize rapid high-precis- ion based on fraction.

采用优化的循环除算法及开辟内存存储数据方式实现了分数的快速高精度求解。

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