作业帮 发表于 2020-10-5 08:49:39

1077《 数字信号处理》20秋西南大学在线作业答案百分

1077 数字信号处理
1.[判断题] 应用DFT分析无限长信号的频谱时,必然会产生误差。
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    A.正确
    B.错误
2.[判断题] 离散周期信号的DFS中,频域的周期N对应数字频率为   2π   。
    A.正确
    B.错误
3.[判断题] 实数序列的DFT为共轭对称的序列。
    A.正确
    B.错误
4.[判断题] 一个域的周期性,对应另一域的离散性。
    A.正确
    B.错误
5.[判断题] 信号的最高频率为3π/5,则最大程度减小数据量的I/D值为   3/5   。
    A.正确
    B.错误
6.[判断题] 单位圆上的零点,对应幅频特性的零值。
    A.正确
    B.错误
7.[判断题] LP表示的滤波器类型是 低通滤波器   。
    A.正确
    B.错误
8.[判断题] 通带最平坦的滤波器是   巴特沃思滤波器。
    A.正确
    B.错误
9.[判断题] 陷波器必然有零点位于   单位圆上。
    A.正确
    B.错误
10.[判断题] 圆周卷积和线卷积相等的条件是圆周卷积的点数不小于线性卷积的长度。
    A.正确
    B.错误
11.[判断题] 按照最大误差最小准则设计的滤波器,具有   等波纹      的特点。
    A.正确
    B.错误
12.[判断题] 单位脉冲序列的DTFT结果为1。


    A.正确
    B.错误
13.[判断题] x(n)与h(n)的卷积的Z变换为X(Z)H(Z)。

    A.正确
    B.错误
14.[判断题] 所谓全通系统,就是其频率响应的幅度在任意需要考虑的频率点处均为常数。
    A.正确
    B.错误
15.[判断题] FIR滤波器由于无原点外的极点,故相比IIR阶次更高。
    A.正确
    B.错误
16.[判断题] 对连续信号作频谱分析,设信号的采样频率为10KHz,频域的分辨能力为不大于10Hz,则对应DFS点数为1000   点。
    A.正确
    B.错误
17.[判断题] 靠近单位圆上的极点,对应幅频特性的极大值   。
    A.正确
    B.错误
18.[判断题] 线性相位可分为第一类与第二类线性相位两种情况。
    A.正确
    B.错误
19.[判断题] 为满足线性相位要求,窗函数本身也应满足相应的对称性。
    A.正确
    B.错误
20.[判断题] 冲激响应不变法由于存在混叠,不能设计高通、带通滤波器。
    A.正确
    B.错误
21.[判断题] FIR滤波器的结构往往是非递归型的。
    A.正确
    B.错误
22.[判断题] 单位延迟单元对应的硬件是存储器,其数目影响系统的复杂度。
    A.正确
    B.错误
23.[判断题] 时域加窗,频域会产生频谱泄漏。
    A.正确
    B.错误
24.[判断题] 离散系统原点处的零极点,不影响幅值,只影响相位。
    A.正确
    B.错误
25.[判断题] 从s域到z域映射,虚轴和单位圆、左半平面与单位圆内部,都必须对应。
    A.正确
    B.错误
26.[判断题] 离散LTI系统稳定的充要条件是冲激响应绝对可和。
    A.正确
    B.错误
27.[判断题] 序列抽取前,为减少混叠的影响,应先进行防混叠滤波。
    A.正确
    B.错误
28.[判断题] 窗函数法是通过逼近理想滤波器的冲激响应来完成设计的。
    A.正确
    B.错误
29.[判断题] 通过频率变换法,可由模拟低通变换为数字各型IIR滤波器。
    A.正确
    B.错误
30.[判断题] 滤波器阻带的衰减,以分贝表示时,数值上越大越好。
    A.正确
    B.错误
31.[判断题] FIR滤波器在z平面原点以外存在极点。
    A.正确
    B.错误
32.[判断题] 按时间抽选基2FFT,频域计算结果也会按奇偶重排。
    A.正确
    B.错误
33.[判断题] 对X(z)在单位圆上等间隔抽样,就得到了DFT。
    A.正确
    B.错误
34.[判断题] 对于DFS,时域与频域的周期都是N。
    A.正确
    B.错误
35.[判断题] 非周期序列的频谱,是周期连续的频谱。
    A.正确
    B.错误
36.[判断题] 正弦信号是功率信号。
    A.正确
    B.错误
37.[判断题] 频域抽样设计法是在频域中逼近理想滤波器的频率响应。
    A.正确
    B.错误
38.[判断题] 零插值后应经过低通滤波,以消除基带映像。
    A.正确
    B.错误
39.[判断题] 窗函数法设计的滤波器,过渡带宽度等于窗谱主瓣的宽度。
    A.正确
    B.错误
40.[判断题] 双线性映射为单值映射,无混叠产生。
    A.正确
    B.错误
41.[判断题] IIR的并联型结构能够单独调整零点,计算误差较小。
    A.正确
    B.错误
42.[判断题] 原位运算是按时间抽选法基2FFT蝶形单元的特点。
    A.正确
    B.错误
43.[判断题] 只要抽样频率足够高,频域就不会产生混叠。
    A.正确
    B.错误
44.[判断题] 实序列的频谱,其幅值偶对称,相位奇对称。
    A.正确
    B.错误
45.[判断题] 线性移不变系统的响应与激励所加的时刻无关。
    A.正确
    B.错误
46.[判断题] 任一序列可表达为单位抽样序列的位移加权和。
    A.正确
    B.错误
47.[判断题] 窗函数的形状,决定了滤波器的阻带衰减与过渡带的宽度。
    A.正确
    B.错误
48.[判断题] 离散系统原点处的零极点,不影响幅值,只影响相位。
    A.正确
    B.错误    天大 联系Q 761296021更多答案请进 ap5u.com
49.[判断题] 设信号时域采样的周期为0.1秒,则频域延拓的周期为   20πrad/s。
    A.正确
    B.错误
50.[主观填空题] <img 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" alt=""/>
    A.
51.[主观填空题] <img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAe0AAAAvCAIAAABBgQWnAAAIuElEQVR4nO3dTUhUbRsH8NkEraRatMtNuyAEC6x0oWKhZUiQtIjoC990GmdendG0Tc2qRURgjprTMKmMqEwfkpEVrQq1cvwoP6lFQVCKixqdmfN9PYsLb4bM3mnmeauj/99C9Dhz8Bzhf+5zneu+x0IAAGBmlj/9BwAAQEqQ4wAA5oYcBwAwN+Q4AIC5IccBAMwNOQ4AYG7IcQAAc0OOAwCYG3IcAMDckOMAAOaGHAcAMDfkOACAuSHHAQDMDTkOAGBuyHEAAHNDjgMAmFtCOa5pGhEZhmEYhq7ruq6rqmoYBm8UX6PRqKqqK9+uqqqu69/tcOVGAABIQkI5ruv64uJiLBYzDIMzXVVVEeWapnG4x2KxcDgsSZIkSUTU1NRks9k+fPjAe2hoaHA4HOfOnXv58qVhGIqiaJrG7/1/HiAAwBqXUI6rqrq4uCjG2hzWsizHYjFd12VZ1nVd0zRFUSKRSCQS4Rzv6+vbvHlzfn7++Pg4Ed2/f3/jxo379u2bmJhYWlriq4JhGJIk8bUBAACS8O/Xx7nqQkRdXV1Xr15NT0/3+XxEFAgE6uvrP378SETRaFRRFA5xSZIwJAcASFpCOd7U1FRVVVVeXn7ixImJiYmOjo7q6mqr1XrmzJnJyUmfz+dwOMrLy0+fPj0yMkJEnMt79+7t7+8/cuRIS0sLEe3atev27du0HPT8NRaLxWIxjMcBAJKWUI63tbVt2rTpwIEDLpdrdnb2yZMnW7ZsycnJcTqds7OzwWAwLS0tLy/P5XINDg4qisLvys7O9nq9fX19drt9fHy8sLDQ6/USkSzLkiTFYjEuv8iyjBwHAEhaonWVwsLCzs5O/v7Ro0fbt2/v7e0Vv83NzW1ubiYiTdOi0SgRBQKBS5cuTUxMEFFmZmYwGCwqKmpqaiKipaUlRVF4MK7rOlfJ/92jAgBYPxLN8fz8fB5NE1FBQYHFYrl37x7/2NDQYLVaBwYGRPtKY2OjxWLJzc2dmpoiora2trKysqqqqvHxca6JcwFdVVWMxAEAUpRojhcUFHCOt7a2Xr58eefOnW1tbfzjyZMnZ2ZmiIi7D4nI7/e73W6XyzU6OsqR7ff7OdPF0DvxMTg3OIrE5yF84kf4d4pvuPyfdyR8yPHXvEgkYhjG0NDQ/Pw8N/XzdkVR8NAYYL1JNMfz8vJu3rxJRFlZWb29vcePH+ciSUZGBm+PnyUU/0ZN02RZ/vnOGxsby1YxNjamaRqn2NLSkmhaNzWeBiVuX/j7n+Qv57iu69FoNBKJ8DeGYTQ0NExPT/Ov+NExmjgB1qFEczw7OzsQCPj9/vPnzy8sLBQXF/v9/p6eHqfTOTIyYhgGd5FzmnPBJBaLRaNRzilZlrnR8Ic793q9//0Rh8MRCoU4uYgoGo0uLi5KkmT2KI9vuudzxSdttSjnyxg/eHjx4sWXL194u8fj4ScQRMRtP7yr33MUAPCXSCjHfT6fy+Vyu902m21kZKSjo6O2tnZubm737t0ej4dfoygKDwZlWeb4FjnOL0g6YiKRiLgGhMNhjjNT4wvbyuxe7fxwjhuGMTMzc/Hixffv3/N2r9c7Ojoq9iluiRDlAOtKQjmelZX17Nmz4uJiLpFnZmY+fvy4u7v77Nmzw8PDuq5z/wkHriRJkUhELMlCRGLm52r793g8/1nFwMAALTek0/KjUbPnFB+FOBAuK4lR9krcoPnq1Su3211XV9fR0fHw4cPe3t6nT58uLCzwa8TNEHIcYL1JKMdLSkpKS0vr6up4ms+hQ4eOHTvmdDr50aWiKNwM/t0iWfFl8e8e032ntbXVZrNV/sjQ0BC/hhfh4muG2R/lcdryCWlpaamoqLDb7eJ8rsQ3Oq9fv75w4YLb7b5z505/f/+DBw/m5+cpbn2b33oMAPDXSCjHjx49arFYRP94aWmpxWLp6ekhIi5ei7k8jY2NNTU1nz59IiJZlpubm51Op91uHx4eTvpP5Pjm+i+vrpX0rv4ShmGIov/WrVufP39OROnp6dwC9EM8u2psbKy+vp6XHmOyLHOJRmxZA/crAPBLEsrxvLy8wsLC6elpHnHn5OTs379/enpaDCo5kjRN6+rqSktLKyoqmp6eJqJgMLhhw4bMzMxQKJTEH8erKoquO14l8YdL45oLX5Y4mn0+X0VFhdVqramp4ZO2Eh81n+RQKPT582cxABdrBYvbFOQ4wHqTUI53dnbyszWOjPb29tnZWSISVQ4ej2uaFgwGr1y5sm3bNr/fT0R3796tra199+4dJdX3zcHEOxfT/dee69evW63Wubm51V7Aj3njT6D4RmxcA+UmAEhOqusdKorCTc0c8Xv27Onr6zt48CDneEZGRnt7Oy3XcJPI8W/fvoXDYS61ezweq9VaWVl53uRsNpvdbq+oqIgviOP5JAAkJ6Uc5865+ObC/Pz81tbWQCBgtVqnpqYOHz7MLS7J3eyrqvr161cx0rx27VpZWZnNZrOaX2Vl5alTp96+fctHGg6HRcUcAOCXpJrj8W0q3d3d1dXVb968IaIdO3b09PSUlJTwtM+fTAL6Ca6lrI1nmz/BbYX4aCQASE5KOc4P37ggcOvWLYvFkp2dzTnu9/vLysoqKytDoZBhGNFoNLl5mPxIML4rRpZlMZHdjPjipy9P6ZQkiReATOUfAQDrWUo5rmmaWNDjxo0bTqfT4XAMDg7ybz0ez+TkJBEpihIOh/mD3H5p/+JTQLm0wh8eFH/xMCN9+TPwuB7FhyZiPZV/BwCsTynluJiC/13dg5cNoeUCetLdJqqqcsudCDtFUTjvTI3n5Yt+wfhjTOXfAQDrU0o5zh/rw8HEY3MenotU4ooBP+TUk+pX4YzjYfhaCjsxp0mSJD7GtbGUIwD8fqn2HYqZnLquxy+iEv/ULr4S8ks7j+9yMZZXeeXd/sHCSOrEocVfkzB/BwCSk2qOAwDAn4UcBwAwN+Q4AIC5IccBAMwNOQ4AYG7/AFwuuHuwJAHcAAAAAElFTkSuQmCC" alt=""/>
    A.
52.[主观填空题] <img 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mZTXl7e3NxMZ4RAtLCwgEdss9kyMzOjo6MPHDhgs9kQ9YMqWSyWnJycEydO0HPEZ09PT0hICPkmCdwPNOFEihMTErZ/4F98ffPmzXXr1hkMhqysrGwOsJfDwsLAFJOTk3q9vqqqijE2OjoaERGBo7S1tT3//PP4Pjw8fPjwYTpBZ2fnCy+8MDw8nJqampyc/Morr0iSpNPpoFqUl5eTUgbHj+HhYUmSqqqqXn/99c2bNyuK0tHRgQN2dHSEhobyagPT0hUlJyfHx8f/+te/djqdeXl58fHxFRUVvb294GswI660v78fUdpjY2OSJCUmJiYnJ1dWVoImcPZdu3bRkolmszkrKwtiCz7z8vKys7MNBgNykPLvMWpVXV2t1+thLSKYRVGUpqYmvV7/2muvSZJEyazNZnNtbW1ubm5ycvKrr766fv16i8WCv7q7u8PCwiD48gsOkOFMDjzUYZDCAP0RBiwIkVTde+JbzDeShoMeoru7OzIy0u129/T0HDp06MsvvwwPD/f5fIODg+hiBwcHv//974Ov4drI+4Pibnd0dDz99NM4RWZmZlFREb7jQff29oaFhZnNZt6pZm5uLjQ0FNO85IiCulksFnInx2d/f39ISAgpVwL3BAZnjDGHw/GPf/xjWY4EgYcLCY3/5s2bmzdvTkhISFyBl19+edu2baCMqakpsoiHh4dpfNrW1obxL2Osvb0dTRR/tbe3h4WF8adsaWlpaWn57W9/y2+EBSTLclZW1q9+9SvG2PT0NIbYra2tBw8ehO3GH5lpzmH4Pj4+jiwZJSUl2NLf3y9J0u7duymke3Z29ty5cx999NHCwkJhYeH58+eX3Y6hoSFJkvbv34+3E0P1jIyMhISElJQUdDmnT58+c+ZMYmJiQUEB9RnY3Waz6fV6ZDFdWFiQJCk4ONhisRgMBgQr+nw+KPgYzdy9e3fTpk0ffPABdj9//jz8Cxljd+7cOXLkCBIwMc2eXVpaggYCmsMXkrOIwXmHDdJzYdKS9Uqr67L78DUvWWJH3vWQDoUyd+/e3bdv39LS0sjIyOHDh9va2g4dOgQ95ODBg7Isj4yMPPvss+BKPGtyQqDoTbPZXFdXV1lZmZ2dTWRNdRgaGgI1M8bgXs0Y6+joCAkJgXsorp12GRwc3Ldv39TUFD3cgYGBgwcPEl+vrsnyibfWBNQVzuyKli+XCtDLQF4f/Huy7H1A1kan00kDIIGHDglP9Pbt20ePHr1niaWlpfPnz6OYyWRqamrKz8/Pz89PTk7etWtXVlbWlStX2trawsPDIe+Cu+Gvxhhrb2/fsWNHTk5Ofn5+UVFRSUlJdnb2hg0b6urq8vPzy8rK6urqzp07xxhbXFzMycmJjY398MMPGWP9/f2IAYEM4vV6EfJHHikYr5GNZrVadTodbGfgzp07EKMpO+itW7eCg4PPnTtXVlaGUQLv0cw0x7g9e/aQePe1d5BnCngQ7t+/3+v1OhwOdAnoNnbt2oV7aLfbJUnauHHj0tISbHxJki5cuPDLX/6ScUzU2dkZEREB9sQl84z5H4I/FKW+W8nXNCWLfoLmoHDzfT4fPO4ZY7dv34bKNDIycuTIkdu3bx8+fNjlcvX39x86dAh8HRkZOT8/D3ufhi8U8YRzLS0tPf744waDgf4ls66vry8sLIyS9qH+sAZW5oxF+fDw8MnJSZJu+vv7Q0ND4cGJapvN5uLi4ry8vMLCwoKCgoKCgsLCwry8vJqaGnrN1so8G54XbibsGPzkQ1jpbeenvnGNROVffvklRDmr1drQ0MBPOTzEqxMA/hWPfuvWreeee44CCnigALzTxsfHo6OjExISEhIS3nzzzZ07d+p0utra2tbW1iNHjkBObW9vB3fjFens7NyyZUtsbGxCQoJOp0tISHj55Ze3b9+u0+nOnDkDf+fS0lKj0ZiVlVVSUmKxWM6cOVNeXl5VVdXU1MQ0G4ox1tPTExYWRmE1lPaT6NjhcISEhNCb19nZCf8QGHEul+vOnTu7du36yU9+QnlKSSohOzEwMDAsLIx0CbPZnJ+fn5eXh/aMXqe8vDwvLw/OYWTqYndJkpaNJ8DXO3fuxKh8ZGQkICBg9+7dDofD4XAYDAZJw4ULF7CLz+dDvAxai8PhIEPbYrHk5uaCWb4F8vLyqqqqaOrSYrFQD3FPPQQNmxxUyPMdl2yz2Wh8hkczMjLy/PPPt7a2RkREuN3u7u5uIu7IyEi73U5RVCB9VYtHxel0Oh0eDU2rklV49+7dkJAQeJiQ+jE8PBwREQG+XhYr29vbGxUV5XA4iGt4+xqmpcViSUlJiY+PT0xMjIuLw5f4+PicnByq4Vrha8aYqqo0v0qtgx8lIFIUEz9k6JCTtcfj+dvf/lZXV0fpCi5cuICxC9NW9Xw4FyagQcIzaG1tjYyMJD+ze1I22UTAzMwMsd4XX3wRFRUFy6WzszM8PJws1vb29sOHD/NPemBg4NChQ4wxt9vd3NyMbERjY2NlZWUo4HQ6f/rTn27cuBE/b9++DQeVjo4OKOloRWjPsiyDy3w+X1xcHHz1yGlBkiQIqWjG4+Pjhw4d6unp2bNnD9WHD7cbHBwMDAyMiIgwGo14jycmJhISEuLi4k6dOhUXF3f69Gl8iY6ORqsmTwnGWE9PD8JtMNPIGPv44487OjpQDWyZmJgIDAzcsGED9StFRUUJCQmSJD355JPoe7xeLybHKHbUZDKBQaanp8Epp74hYmNj4+Li4uLicnJyaB0Ak8lEY4hlfO1wOJqbm5uamuhRkn89rZ9At7qvr+/JJ590uVxms3nfvn19fX3bt2/3eDz9/f1wmQdfY7aQCIVmLPFZVlaWlJRkMBhu3LgBNzJ6QHhtwsLC4N2hqirchLARMah0P2ErIP03PIhQYbKvVS1WYJWGoWge8WtIt8WVUoOlyZWSkhJEimI8xIfDkIoiy/Kf//zn4uLis2fPfv7553/5y1/++te//v3vf5dl2ePx2Gw2YV/7AyQ8vI6OjqioKNJ5eTDGpqenf/Ob31CPzRhzuVzFxcUZGRmYT+NFarQK8q8YGhras2cPeAf9eWdn58GDB91u9+joKOI4iDJIgCsrK2toaMAr0tbWtnfvXsZYa2vrD3/4Q8SkYKxHg3qHw1FcXIxpxg8++MBsNr/zzjsQN6KiomBKWCyWhoaG5ubmiYmJgoKCjz76yOl0IvRc0UI2QPG7d+8mXfVrlTvSQ9xu9/z8POTpxx9//PLlyzk5OcHBwUajMSkpacOGDaTLBwUFVVRUeDyemZkZcmPPzMzcvHmz3W7HGcGeMH5lLfEp+y9N+5DnH+PspmV8Da/N//u//4NDxcLCAoVRMM15gCZC5+bmGhsbzWbz1atXMRa5fv26oihTU1P19fUul2toaAj+13gWkEQp4FNV1cLCwuzsbMaY2WzeunWr0WhkXDYYxlhXVxccZhhjtJoB3lu73U45A0iZxRlnZmYYYxj5DQwMhIaGYgoX5c1mc0FBATKDA0VFRbm5uRUVFctCctYEFC7yCHTscDgaGxtjY2NjYmJaWlr4JkzdGJ6gLMufffZZbm5uTU3NJ5988rvf/e7zzz8ndyOLxSK8+vwB/9JDWltb9+/ff79Cd+/e3blzJ9otzKvs7OyKigqr1ZqYmPj73/++p6dn27ZtZWVlZWVl0dHRNCs4NzdXX19fWlpKDMu+OkfEGENQOxlHbrc7Ly8PIRIgiImJCfh13b59+4UXXjCbzeRU4PP55ufnS0tLExMTS0tLmUa4BoOhvLwc/iEgX8bYl19++fjjj+MsIyMjkiTB2QPmGCQRbN+zZw85NdNUm6IFOpPYhzpQr0Zvf1xcHEkclA0jJiYGyk9+fv7Zs2exsbOzU5KknJycysrK+vr6+vp6EtO7urrIvYG6BI+WXurbNR7SFlQuSxfVfxlf2+12g8HwxBNPQEBAnlVqwBiR4Gj07CYnJzdu3Dg1NZWamvr+++8zbvngwcHB/fv3k+/zsvjy5uZmulHz8/ORkZEkatOVwv96dnaWXDMxYIqMjGTa9CBF4kDriIiIQEoAXGlPT8++ffvm5uaoG5iamsrIyIiJiYmJiQGpAQUFBYjB4QX0NQEYGWRE9/X1BQUF4a/g4GD0VXRdpF/T+/zHP/4R410Af6EXXJYHRuChQELox+TkJGb/ylegsrIyMTFxy5YtaMkg6/z8fOzf29u7ffv2f/7zn5IkvfHGGzqd7sUXX3z66adBOnfv3gVFgnHGxsbee++9gYGBZ555BlImn4wfB8/JyUEuTfyL7YuLiz//+c8HBgZ27NhBbyS4zGg0njx5ktJvjo2NGQyGnJwcxtjAwAD8+Sj9SH19vUfL+pScnIxieB3Rf4yOjgYEBOzatcuj5TPCC02KB4Q/dF2qqoLLeCpHzUtKSjIzM+vq6uhG+3y+rKys6OjogoICbAFflJaWnjhx4vjx46gM03QnOMOQWK9q0dW8J9w3fdgktVOUDYnIbAVfWyyWpqamiooKijunpqtwqa+IT5GMG+lPvV5vbGwsuiWr1Xrt2jU8dJA+XZTVaq2urk5MTJQkCSsqOByO9PR0SZIKCgrOnTuH6yXJJTIy0mQyUU1mZ2eh/ldXV2MgQp7dFosFx6mpqSHBuqenJzw83GQyUf1X0aZJQ1srOoDKxYviJsiyPDc3hwFEUVFRUVERn1INu9C8CD1H+PCpqgoriuYn11a/9ahCItt2bm7u5MmTJ1bg5MmTOp2uuroa/gz5+fkgR5icIyMjtbW1/f39ZDMuLCzU1dW53W6ErVdVVVGszfj4eGxsLOKMKdQbbcZisVRWViJmHccBxaO5Dg4OYhbo7Nmz/KQo40LhV75P8NbYs2cPH6O8zDhFu5VlGQNthNhgF9IfFM0dgiQ/2N24dfiX3OyWWb5uLcc0vxHTPsqKvBkebslzDP+R0AomLQVbYmDBcw1//JU8TlsULiMg8eb97Oupqam8vDzakaKBeI0IIwz44WVmZmZmZlJ5p9OZk5MDVk1ISNDr9ZWVlXhnKObFZDLFxsbqdLq0tDS9Xq+q6vz8fHx8PLIgZGVlwZggF2/ynqY0KQkJCampqXq9fll80+zsbHx8PP5Cv+7xeAYHByMjI2Hj4+2iOTfeNqeN7FFJ5gc/XcZlhcRDV7T0s+TXT09W0fz3Fc0Ra9nUpcBDwb/0kH/Tv7K3t7e4uJhp8t/Kt5nfMjo6CldonsLMZjO51hLxqao6MzNz7NgxkDXZPvgETdjtdhj1JA6Qo5LKpcqkOA6mOWYcOHAAp8M4mgxzHBzz6VRDk8kE3ztED5LLAbVh6hV8Ph8txaJqCx6SjYNPXsRgnArBNNVYVVUiGkWLVMRP2Nd8XlCYkPxB0IXQfB3fLV27dq26uvrSpUv0L+1FUgMlicaWrq6usLAw3jmaHhP/iOmSVc1LbGZmJiYmBk54ipb5i98FAZ/80XxfzUV+zxOxryZjGRwcpPgsxsmvVJJ2528R04JlGGNGoxHBkIzze6HuallNyCvcZrM1NDRU+z1qamrq6+srKioqKyurqqoqKiouXbq0LJiTunlqXIwTnaj5MO6dV7SEOUzAD/DorC9DxjjNiSE/H6Ilr1+/TiM7BHb7tIgYxpiiKJOTk83NzVlZWZIkbd26lRItocOgtKsPGmSM9/b2hoSEwGy/X2E0MK+WTRRXd+PGDVzFG2+8kZaWRg62qxwH7IYeAlfqh/ERQ0NDwcHBZWVl165dQ+rBlaOZe0JVVYR+5Obmbtq06Zs+yvn5eZ1O9/Yaweuvv37y5Mm33377rbfeiomJIQd5gUcDjxpfM22SkDE2MTGRmZmZlJT06quvZmVl0WjX6XTCYYAEAY/HMzo6eurUqePHj6emppaXl9tsNiJ0Pgr8QV8CGYbt7e0HDhwgz4f7gTKE4GdhYaEkSW+++SZNMFAipK+lYAr4Zn6pA9jt9uzs7GPHjmVkZFitVrqcVTK90PBlYmIiJiYmLi4OKQS+oxr7AdaQ/i7w7+DR4RFDiOEAAAVHSURBVGtFW/mJcX6BfAGflhCVJgkdDodHS+q9clBMxjXt/sCvgdND2tvbEQlyP+qEdUkGOFaQkSSpsbGRypAiiTR4qxyHMYacTTSC9mexEtIqHqjD4bhnVWla4j+fK1PXAvCu4jtFkEOy+0+uXcCv8OjwtaqqYFhyiVO4HBfkt8tLlpQyn3GeZ5jjop+kOXw3l0B6SF9f3+HDh+Fsfr/CdL2MsZmZmY0bNxYUFNy4caOuru7TTz9lGtF4vrqg2srjgK+7urpg0fPuH/4DlZsgpYXfnE7n/foh6r9lWUY2xEfbsla1vOS4PzTwerSv+n8Njw5fM803HGxLTM0Y8/l8RqPRq2U9BYuhGSMuBsovb43i1af4gmWxnQ/0EvClo6MDS5uvwpvklrewsFBdXR0aGnrp0qXjx4//+Mc/liTpvffeQzGEj68yZaRquQm3bt1qsVhgqfnnOJoccqDwgLLvd4vgX4zuCvE+6oq50H8HD9w2/i+BaRlXVG0CnGkv/H921wX8BY8UX/MBLOQFoWr+Z5TSBF4H5NZGxgh5rVH4AL+09oOuvKqqYElgeno6LS3tk08+WUXHIOqB5+L3vve9U6dOYcubb74ZEBDw8ccfk6ftKqeGRvTOO+8UFBQgtRMvBPkJcL3EPvQEV4FPW8JY1dZvQ4/+TfnrO6bdbweMiqh/Urj1Rb/tLRfwOzxSfE2WFx/hwjda+ovIWuWyUJI9wkeoM83zT33ARoqqBQ1SGNHY2Nj27dvvtwwN7cUYGxgYCAoKQkoAbEE21w0bNtBiTqvoIYyxmzdv7tq1C1uQxcnf4iNULccTGf73nKXgyy/zOvWtqeRN3xT0ejPOq1KIIY8YHh2+VrnlcVVVpcapasKIyikktF3lgryXhdUse9cfNF8zLnQFuHXrFp+XigiIv0BVE7sDAgJ27txJlzA6OopEKJQMS/7qSuHLLqe3t3fv3r0UxKR+25D3Bw2VC6n/2ggO/l/1/t7Wjxj4Lo3Pai3wCODR4eu1DlVLbkkNbHJy8syZM59++qmXW5sRio361eCd3t5eSZKQFQuwWq3IFEgLIChcnm5ILiTK2+32Gzdu5OTkwLR3c2sECwgI+A8EX/sX4OhNvg19fX1btmxhmqGEjGuQBRRuzReTyfTSSy+tW7fuD3/4A45z6dIlSZKSk5MxlcrrP5QBGbGdPp9vbGxs/fr1oHLoJwsLC2IoLSDgbxB87S8gBQZCB0L4pqam4uLisOAOrSeLHPxwkKCAmsXFxZdeekmSpKtXr8IROyUlhQ5L+YuRP4S3oBcXFxsbGzMyMpxOJ03MklUuICDgPxB87S+Ad4qirb3CtKhFu93+2muvYY1HcjGEd4RXW7GeAjtPnTr1ox/96MUXX0ROLpjPMK5hU8PERjJCZB9sbm6Oi4tjmncN1v1ifhmSLiDwPw7B1/4FTPTB5wyRe0g59Oqrr3788ceMMUoKSGnn8HPlBCmt3kKOjCtdPqqrq2NiYhiXahV5n1ceTUBA4KFD8LUfgSIdKFyFFlKx2Wyvvfbahx9+iOUdyEWPIv08Hg9EZ0wY4ifmFVVtvQU+eZ7Vaj137lx8fDzTskxQ/lihhAgI+CcEX/sLVC7GBxmm+FzVjDGLxXLq1ClyueNXtqZVVJaWlrCML2STxcVF+JMoWgpvRVuZYWxsLDY2FqemLNuUgFv4hwgI+CEEX/sXQJoUYMlv581eMpZVbeXZlfKFqqUXRwGVW06FPzI5rVM+LBT2t3gZAQEBwdcCAgICawOCrwUEBATWBgRfCwgICKwNCL4WEBAQWBv4fxBITj/x5XtnAAAAAElFTkSuQmCC" alt=""/>
    A.
53.[问答题] 给定某系统函数为<img class="kfformula" src="data:image/png;base64,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" data-latex="H(s)=\frac {2} {{s}^{2}+4s+3}"/>,试用冲激响应不变法化为数字滤波器,给出相应的过程和数字滤波器的系统函数。
    A.
54.[问答题] 试绘制按时间抽选基2FFT算法的蝶形运算单元流图,简要说明其特点。
    A.
55.[问答题] 简述时域抽样过程及频谱的变化。
    A.
56.[问答题] 作谱分析时,抽样点数为2的整数次幂,要求频率分辨力≤10Hz,信号最高频率≤4KHz,试确定最小的记录长度,最小抽样频率及一个记录中最少点数N。
    A.
57.[问答题] 双线性映射法的基本原理是什么?如何选择控制参数c?有什么优缺点?
    A.
58.[问答题] 简述稳定性的含义及系统稳定的充要条件与判定方法。
    A.
59.[问答题] 利用计算机分析信号x(t)=sin(20*pi*t)/(20*pi*t)的频谱,试利用Matlab编写相关的程序,实现信号的抽样、频谱的计算、频谱的显示等,并对每条语句加以必要的注释。



    A.
60.[问答题] 已知数字低通滤波器的性能指标如下,试设计以巴特沃思滤波器为原型的数字滤波器。
      抽样频率:10KHz
      通带截止频率:1KHz      通带最大误差:1dB
      阻带起始频率:1.5KHz   阻带最小衰减:15dB
    A.
61.[问答题] 用窗函数法设计一个线性相位FIR低通滤波器,给定抽样频率为2pi*1.5*1000(rad/sec),通带截止频率为2pi*1.5*100(rad/sec),,阻带起始频率为2pi*3*100(rad/sec),阻带衰减不小于-50dB。要求给出相应的Matlab程序。
    A.
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