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上机一作业 要求： 1在每道题后在该文件的每道题后记录必要的结果； 2在使用maltab软件时，不要在使用中关闭该软件，否则上机记录丢失， 做过的题目必须重新执行。 上机内容： 1.???熟悉MATLAB环境2.????利用Help命令，搞清楚MATLAB的所有主题，利用help signal和help control搞清楚这两个工具箱 help signal Signal Processing Toolbox Version 6.0 (R13) 20-Jun-2002 Filter analysis. abs - Magnitude. angle - Phase angle. filternorm - Compute the 2-norm or inf-norm of a digital filter. freqs - Laplace transform frequency response. freqspace - Frequency spacing for frequency response. freqz - Z-transform frequency response. fvtool - Filter Visualization Tool. grpdelay - Group delay. impz - Discrete impulse response. phasez - Digital filter phase response. phasedelay - Phase delay of a digital filter. unwrap - Unwrap phase. zerophase - Zero-phase response of a real filter. zplane - Discrete pole-zero plot. Filter implementation. conv - Convolution. conv2 - 2-D convolution. convmtx - Convolution matrix. deconv - Deconvolution. fftfilt - Overlap-add filter implementation. filter - Filter implementation. filter2 - Two-dimensional digital filtering. filtfilt - Zero-phase version of filter. filtic - Determine filter initial conditions. latcfilt - Lattice filter implementation. medfilt1 - 1-Dimensional median filtering. sgolayfilt - Savitzky-Golay filter implementation. sosfilt - Second-order sections (biquad) filter implementation. upfirdn - Up sample, FIR filter, down sample. Discrete-time filter object. dfilt - Construct a discrete-time, filter object. (Type doc dfilt for more information) FIR filter design. cremez - Complex and nonlinear phase equiripple FIR filter design. fir1 - Window based FIR filter design - low, high, band, stop, multi. fir2 - FIR arbitrary shape filte