[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f0WOAK-1_umQ3jYcFcTU32Qcqi73BXRd4gv3eswF79Ek":3},{"id":4,"source":5,"question":6,"options":7,"answer":12,"related":13,"type":24,"origin":113,"createTime":78},123835268,"v1","各种相同宽度的窗函数加窗后滤波器性能指标如下表,现要设计一阻带误差不小于60dB,过渡带宽不大于0.1π低通滤波器,则可选用的窗形状和宽度为()\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002Fe70d4aaa29323fdd7ab56ea23735227a.png\">",[8,9,10,11],"布莱克曼窗,N≥5.5","布莱克曼窗,N≥20","布莱克曼窗,N≥110","布莱克曼窗,N≤110",[],[14,27,37,48,58,68,79,89,99,109],{"id":15,"source":5,"question":16,"options":17,"answer":22,"related":23,"type":24,"origin":25,"createTime":26},123835243,"给定\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2661650\">,\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2661678\">,则\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2661696\">可表示为()",[18,19,20,21],"\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2661834\">","\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2661763\">","\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2661775\">","\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2661796\">",[],[],0,null,"2023-12-29T17:47:22+08:00",{"id":28,"source":5,"question":29,"options":30,"answer":35,"related":36,"type":24,"origin":25,"createTime":26},123835245,"若某离散系统的单位抽样脉冲响应为:\u003Cimg src=\"https:\u002F\u002Fmooc1.chaoxing.com\u002Fananas\u002Flatex\u002Fp\u002F2708798\">,该系统的差分方程为()",[31,32,33,34],"\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2708894\">","\u003Cimg src=\"https:\u002F\u002Fmooc1.chaoxing.com\u002Fananas\u002Flatex\u002Fp\u002F2708883\">","\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2708900\">","\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2708909\">",[],[],{"id":38,"source":5,"question":39,"options":40,"answer":46,"related":47,"type":24,"origin":25,"createTime":26},123835249,"下面理想数字滤波器的幅频特性图中,()为理想数字全通滤波",[41,42,43,44,45],"\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002Fd2db9c38f13a7e5f5c4d4d3375d190cd.png\">","\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002Feb80caa5c06e6c5ac05e390594dcb6e8.png\">","\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002Fa361442c0337f3ffb196c3b7f5b3db55.png\">","\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002F32582ea2d7d4b43d97fd225064a5c6af.png\">","\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002Fe09b24e4850b174f866262300207ae57.png\">(1分)",[],[],{"id":49,"source":5,"question":50,"options":51,"answer":56,"related":57,"type":24,"origin":25,"createTime":26},123835251,"给定\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2662339\">,则\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2663583\">结果可表示为()",[52,53,54,55],"\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2663585\">","\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2663614\">","\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2663219\">","\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2663467\">",[],[],{"id":59,"source":5,"question":60,"options":61,"answer":66,"related":67,"type":24,"origin":25,"createTime":26},123835255,"下图为某IIR滤波器的幅频特性曲线图.要求\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002F581abf5acc29a704936321d802db62c3\">频段的频率成分,衰减大于40dB,\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002F163e365b50d2ca6042f6e678807bc0ad\">和\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002F28dca113296dc42b194b134041e8f4ee\">以上频段的频率成分,幅度衰减小于1dB.下列描述 不正确 的是( ). \u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002F9c3f59357db0c09bdc149d257ecc1f88\">",[62,63,64,65],"设计结果不符合指标要求","该滤波器具有带阻滤波器的特性","该滤波器可能为椭圆类型滤波器","该滤波器通带和阻带范围都具有等波纹特性",[],[],{"id":69,"source":5,"question":70,"options":71,"answer":76,"related":77,"type":24,"origin":25,"createTime":78},123835259,"下面离散系统的零、极点分布图中,X表示极点,o表示零点,则具有高通频率特性的是()\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002F872e9a002a9945fb2b383c90c649e478.png\">",[72,73,74,75],"图A","图C","图B","图D",[],[],"2023-12-29T17:47:23+08:00",{"id":80,"source":5,"question":81,"options":82,"answer":87,"related":88,"type":24,"origin":25,"createTime":78},123835262,"已知线性移不变系统\u003Cimg src=\"https:\u002F\u002Fmooc1.chaoxing.com\u002Fananas\u002Flatex\u002Fp\u002F2723256\">,信号\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2723307\">经过该系统,得到的响应\u003Cimg src=\"https:\u002F\u002Fmooc1.chaoxing.com\u002Fananas\u002Flatex\u002Fp\u002F25060\">为()\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002F35512cbdb77655cf94d0b98020222dcb.png\">",[83,84,85,86],"\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2723296\">","\u003Cimg src=\"https:\u002F\u002Fmooc1.chaoxing.com\u002Fananas\u002Flatex\u002Fp\u002F2723302\">","\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2723326\">","\u003Cimg src=\"\u002Fananas\u002Flatex\u002Fp\u002F2723330\">",[],[],{"id":90,"source":5,"question":91,"options":92,"answer":97,"related":98,"type":24,"origin":25,"createTime":78},123835264,"若以\u003Cimg src=\"https:\u002F\u002Fmooc1.chaoxing.com\u002Fananas\u002Flatex\u002Fp\u002F2697679\">抽样频率对某音频信号进行抽样而没有产生频谱混叠失真,则该音频信号的最高频率不会超过()",[93,94,95,96],"20KHz","10KHz","5KHz","2.5KHz",[],[],{"id":100,"source":5,"question":101,"options":102,"answer":107,"related":108,"type":24,"origin":25,"createTime":78},123835266,"已知某模拟信号的频率范围是0~20KHz,以下列采样频率fs抽样,不会产生频谱混叠的是()",[103,104,105,106],"fs=10KHz","fs=20KHz","fs=0KHz","fs=48KHz",[],[],{"id":4,"source":5,"question":6,"options":110,"answer":111,"related":112,"type":24,"origin":25,"createTime":78},[8,9,10,11],[],[],{"courseName":114,"courseImg":115,"workName":116,"workId":116,"count":24,"courseId":117},"数字信号处理","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fcd6aa804f56468e1fa7bc4a2057046b9.png","","569df876f406611189b31294e1a0028c"]