程序实现fSK的发射机和接收机的解调过程，包括性能分析。绘制有关的性能曲线，和波形和频谱图。还可实现BFSK，MFSK。FSK解调时候，有两种解调方法：1包络解调法，2相干解调法。-program fSK transmitters and receivers demodulation process, including performance analysis. Drawing on the performance curve, and the waveform and spectrum. B

同态滤波法、希尔伯特法、香农法求取心音信号包络的matlab算法-The homomorphic filtering Law Shannon Hilbert method of calculating the heart sound signal envelope Matlab algorithm

包络解调程序包络解调又称包络检波，适用于普通调幅信号的解调，指产生的输出信号与已调信号包络线成正比的幅度解调。(Envelope demodulation procedures)