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p16.rar
OFDM digital modulation for wireless communications systems. multilevel quadrature modulation with constellation with m symbol
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JPEGimageCompressiontechniquesimplementationandopt
... JPEG方法压缩的原因。
介绍JPEG基本原理：JPEG对灰度图像的压缩处理过程主要包括:图像分割,离散余弦变换(DCT),量化(Quantization),“Z”形排序(Zigzag Scan),差分脉冲编码调制(Differential Pulse Code Modulation,DPCM)对直流系数(DC),行程长度编码(Run-Length Encoding,RLE)对交流系数(AC),霍夫曼(Huffman)编码等。
JPEG标准的特点是离散余弦变换。
比较详细介绍压缩系统的构成和实现。 ...
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pcm.rar
natlab code for pulse code modulation
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0_BPSK_QPSK_.rar
DIGITAL MODULATION TECHNIQUES
the material describes digital modulation techniques such as BINARY PHASE SHIFT KEYING (BPSK), DIFFERENTIAL PSK (DPSK), DIFFERENTIALLY-ENCODED PSK (DEPSK), QUADRATURE PSK (QPSK), QUADRATURE AMPLITUDE SHIFT KEYING (Q-ASK), ...
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2_SpreadSpectrum_07.rar
SPREAD SPECTRUM MODULATION TECHNIQUES
-spread spectrum - those modulation methods that are producing a signal whose
spectrum is more wider than of the data signal, the occupied frequency band being
independent by the signal of data band.
-The signals ...
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motor.rar
单片机产生PWM波对电机进行调速
脉冲宽度调制(Pulse Width Modulation—PWM)是指将输出信号的基本周期固定，通过调整基本周期内工作周期的大小来控制输出功率
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