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数字信号的传输方式分为基带传输和带通传输，在实际应用中，大多数信道具有带通特性而不能直接传输基带信号。为了使数字信号在带通信道中传输，必须使用数字基带信号对载波进行调制，以使信号与信道的特性相匹配。这种用数字基带信号控制载波，把数字基带信号变换为数字带通信号的过程称为数字调制。通常使用键控法来实现数字调制，比如对载波的振幅、频率和相位进行键控。(Transmission of digital signals into base band transmission and band-pass transmission, in practice, most of the channel with band-pass characteristics can not directly transmit base-band signal. In order to make the digital signal is transmitted with a communication channel, you must use the digital baseband signal to modulate the carrier to make the signal to match the characteristics of the channel. The digital baseband signal control with a carrier, the digital baseband signal conversion to digital bandpass signal is called digital modulation. Keying method is commonly used digital modulation, such as on the carrier' s amplitude, frequency and phase shift keying.)

this is about active power filter

睡眠脑电的分期，根据assmR&K原则，将睡眠分为不同的期段，实验自动分期(EEG sleep staging, according to assmR & K principle, the sleep period is divided into different sections, experimental automatic staging)

Digital Image Processing Using Matlab Additional Material

INTERPOLATION OF A SIGNAL

QPSK system simulation not working

matlab编写的熵权代码，很实用的东西(Entropy matlab code written, very practical things)

LTE eea3 eia3 zuc等算法的详尽描述，其中包含有实现源码，测试例。均来自标准文档。 (A detailed description of LTE eea3 eia3 zuc algorithm, which includes the source code, test cases. From the standard document.)

关于MATLAB与双馈风机接口计算智能算法(About MATLAB and DFIG computational intelligence algorithms Interface)

采用标量衍射理论，实现菲涅尔衍射和夫琅禾费衍射，对光波的波前传播和数字全息的应用有帮助。(Using scalar diffraction theory, Fresnel diffraction and the realization of Fraunhofer diffraction of light waves of wave-front propagation and the application of digital holography to help.)