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- MCU AT89C51 is adopted to control DDS chip AD9850 to produce the sine signal which frequency may be adjusted. The pure signal can be obtained through the low pass filter,and then target signal is drove by the power amplifier. 采用单片机AT89C51控制DDS芯片AD9850产生频率可调的正弦信号,并通过低通滤波器得到纯正的信号,最后经过功率放大驱动电路输出目标信号。
- It was pure luck that he was home when we called. 非常幸运，我们打电话时他在家里。
- I have the pure heart of a newborn baby. 我有一颗赤子之心。
- A red light is usually a signal of danger. 红灯通常是危险的信号。
- We must not condemn her on pure supposition. 我们不能单凭猜测就谴责她。
- Don't believe what he's saying it's pure bunkum. 别相信他的话--纯粹是胡说八道。
- A long hot bath can be pure luxury. 洗个痛快的热水澡可真是一种至高的享受。
- The fields were all covered with pure white snow. 白雪皑皑，铺满田野。
- I stood watching for the signal to change to green. 我站着等待交通信号转为绿灯。
- Let's set the clock by the radio time signal. 咱们照着收音机的报时信号把钟对一对。
- The condition or quality of being pure or chaste. 纯洁纯洁或贞洁的状况或者品质
- That new lamp they've bought is pure kitsch. 他们新买的那盏灯真俗气。
- A red lamp is often a danger signal. 红灯常常是危险的信号。
- A reflected signal on a communication channel. 一种在通信信道上反射回来的信号。
- Besides, it's make of pure wool, very soft. 另外，这是纯羊毛的，手感柔和。
- The rise in prices was a signal for rebellion. 物价上涨引起了叛乱。
- It's make of pure wool, very soft. 这是纯羊毛的，非常软。
- A channel over which pilot signal is transmitted. 可在其上传输导频信号的一种信道。
- Sorry I hit you; it was a pure reflex. 对不起我撞著你了; 这完全是无意的。
- You think that, do you? Pure illusion! 你是那麽想的吗? 纯粹是错觉！
