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By replacing the sinusoidal modulation wave with its tangent or secant, three novel tangent sampling methods and two secant sampling methods were gained. 并在此基础上，分别利用切线和割线来近似替代正弦调制波，获得了3种新的切线采样法和2种割线采样法。
On the basis of design of DDS utilizing FPGA, it presented a method of realizing the altitude modulation by generating the main wave and the modulation wave respectively, and the frequency modulation by changing frequency tuning word of main DDS. 在利用FPGA实现DDS的基础上,使用两路DDS分别产生主波形和调制波形,方便地实现两个任意波信号的幅度调制; 同时,通过调制波形数据实时控制主DDS的频率控制字,用数字的方法直接实现波形的各种频率调制。
That period was a bright page in the history of Chinese literature. 那个时期是中国文学史上光辉的一页。
Let us hope that the period of this injustice will be over soon. 让我们希望这个不公正的时期很快结束吧。
By transverse exposure, periodical modulation of refractive index is formed along the axis of optical fiber. 制备原理是对光纤横向曝光，使光纤的折射率指数在轴向发生周期性变化。
In this thesis, CO2 laser was employed to periodically modulate the diameter of PCF. 在本论文中，我们使用二氧化碳雷射束对光子晶体光纤在传播方向上的外径尺寸作周期性的调变。
Childhood is a period of rapid growth. 幼年是生长迅速的时期。
He consulted the chronicles of the period. 他参考了这一时期的编年史。
high-frequency periodic modulation 高频周期调制
Demodulation of Balance Amplitude Modulation Wave 平衡调幅波的解调
amplitude modulation wave and demodulator 调幅波解调器
He had to decide within a given period. 他得在一定时间内作出决定。
She has a detailed knowledge of this period. 她对这段时期的情况了解地相当详细。
In that period auto sales hit a14-year low. 这时期汽车销售量达到14年来最低水平。
An approach that generates 5 pulse-width modulation waves with ATmega16L AVR embedded microcontroller for the controlling of JR servos is described in this pa per. 本文提出了利用ATmega16L AVR嵌入式微控制器产生5路PWM信号控制JR舵机的方法。
In this period, unemployment reaches record levels. 这段时间的失业人数又达到了创纪录水平。
Which period of history are you studying? 你正在学哪一段历史？
time period modulation frequency 时间周期调制频率
Can the person have periodic mood wave motion? 人是不是会有周期性的情绪波动？
With cyclic prefix, the channel matrix exhibits block circulant property which is exploited to blindly identify periodically modulated block transmission system in an existing method. 一种针对具有循环前缀和周期调制的块传输系统的盲辨识方法，利用了信道矩阵的块循环特性来求解信道系数。