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在分析高效宽频带变频系统的基础上提出一种可以把变频部分与多种调制方式灵活结合在一起的方法，并以QAM调制为例，给出具体算法．分析结果表明，该方法降低了对处理速率的要求，提高了处理能力(In order to design an efficient and flexible DDC／DUC system，this paper combined the signal processing of DDC／DUC with QAM system and presented a new method based on the analysis of this efficient broadband DDC／DUC system．QAM modulation was taken for example，and a detailed algorithm of a channel system with 0～30 MHz and 60 channels QAM was presented)

说明：  提供两个点坐标，可以利用本程序，计算两点距离，简单好用。(Coordinates of two points, you can use this procedure to calculate the distance to two points, easy-to-use.)

hyst stst zoho busy bee

An example of Chaos Theory application

自适应滤波器，运用自能算法滤除噪音，实现滤波(Adaptive filter, using the can filter out noise, the algorithm to implement filtering)

this is the inverter model DC-to- AC in order to be used in a simulink model

Quadrature amplitude modulation (QAM) is a modulation scheme in which two sinusoidal carriers, one exactly 90 degrees out of phase with respect to the other, are used to transmit data over a given physical channel. One signal is called the I signal, and the other is called the Q signal. Because the orthogonal carriers occupy the same frequency band and differ by a 90 degree phase shift, each can be modulated independently, transmitted over the same frequency band, and separated by demodulation at the receiver. For a given available bandwidth, QAM enables data transmission at twice the rate of standard pulse amplitude modulation (PAM) without any degradation in the bit error ratio (BER).

Matlab计算信噪比,单声道，双声道均可，公式准确程序清晰(Matlab calculation of signal to noise ratio, mono, dual-channel may be, the formula clear and accurate procedures)

histogram maching for image processing

JP2K matlab source code and doc