[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fjo_G6VzzkUYOpzde1lqTxbL0eDTDqvdzpQ9T4QwHcd4":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":15,"related":16,"source":26,"type":27},[],"2024-12-16 18:19:40",1004567416,[8,9,10,11],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6e79317bce599b5638dbed116033a03c.jpg\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F2d13835aedf61bf189f5d99391fe904e.jpg\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F4f1e4c7fec3d8d08ba6d3ae8019fac68.jpg\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F87fba146fe93f0f56c053784c9e2b77a.jpg\">",{"courseImg":13,"courseName":14},"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F440432b4d1bdf58bc4d9b0f931c8a4bd.jpg","数字信号处理","用按时间抽取FFT计算\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0adbd1fd137bb21ecb58b5783c0dcc32.jpg\">点DFT所需的复数乘法次数与( )成正比",[17,28,37,46,53,62,70,79,82,91],{"answer":18,"createTime":5,"id":19,"options":20,"question":25,"source":26,"type":27},[],1004567345,[21,22,23,24],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F7ff7fe3162d4d46752c20aa7eb226d28.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3662beecdd2b1ed78af227e4d6f58fcc.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe849a1be6f5e88f79c2c9c9477fa3a7f.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fedb9b40d9550b8dcd17136ecbfde3449.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F70984aaf008aaead354dcf5ed00e8379.png\">","v2",0,{"answer":29,"createTime":5,"id":30,"options":31,"question":36,"source":26,"type":27},[],1004567367,[32,33,34,35],"1","2","3","4","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fcb867c599268ffff3287b5f15f044bad.png\">",{"answer":38,"createTime":5,"id":39,"options":40,"question":45,"source":26,"type":27},[],1004567369,[41,42,43,44],"该滤波器只能设计为二类线性相位滤波器","该滤波器的幅度响应应该以0,&pi;,2&pi;呈偶对称","该滤波器可以设计为一类或二类线性相位滤波器","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa4c78ad3eae033fea9f0309d4d32c349.png\">","用频域采样法设计一个高通数字滤波器,滤波器的长度N为偶数,那么下面哪个说法是错误的",{"answer":47,"createTime":5,"id":48,"options":49,"question":52,"source":26,"type":27},[],1004567378,[35,50,51,34],"5","6","在N=32的基2时间抽取法FFT运算流图中,从x(n)到x(k)需( )级蝶形运算过程",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":26,"type":27},[],1004567388,[57,58,59,60],"偶对称序列","奇对称序列","共轭对称序列","共轭反对称序列","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd755074308dffeb93dd9fa368131243c.png\">",{"answer":63,"createTime":5,"id":64,"options":65,"question":69,"source":26,"type":27},[],1004567394,[66,67,68],"0个","1个","2个","用频域采样法设计一个低通数字滤波器,要求滤波器的阻带衰减需要达到60dB,那么应该在滤波器频率响应的过渡带上,至少采样几个点",{"answer":71,"createTime":5,"id":72,"options":73,"question":78,"source":26,"type":27},[],1004567409,[74,75,76,77],"低通","高通","带通","带阻","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F125dfc217117ab077bb830fef7ed70d2.png\">",{"answer":80,"createTime":5,"id":6,"options":81,"question":15,"source":26,"type":27},[],[8,9,10,11],{"answer":83,"createTime":5,"id":84,"options":85,"question":90,"source":26,"type":27},[],1004567430,[86,87,88,89],"FIR滤波器总是具有线性相位的特性","FIR滤波器的单位脉冲响应关于原点对称","单位脉冲响应为奇对称奇数点的FIR滤波器,不可能是高通滤波器","单位脉冲响应为偶对称偶数点的FIR滤波器,不可能是低通滤波器","下列关于FIR滤波器说法正确的是( )",{"answer":92,"createTime":5,"id":93,"options":94,"question":99,"source":26,"type":27},[],1004567438,[95,96,97,98],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F991772c280f45091f28634d6e817da96.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd3d4b035204def2f617f9165f34321a4.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6969ec5f0762453288883ff545f02fe3.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3e902fabd8d54ac792bf5327e2fbb2f7.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fab212da7c17703e977fee416b2fc8ac7.png\">"]