[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fXDUurk0daKa-h8PEPkvZztbRb_vW9hDtTvIeLG1zwZE":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-12-19 10:41:34",273575790,[8,9,10,11],"低通滤波器","高通、带阻滤波器","带通滤波器","任何滤波器",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},40,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","work_49150648","第六、七章作业","考虑到频率混叠现象,用脉冲响应不变法设计IIR数字滤波器不适合于",[21,32,41,44,53,62,71,80,89,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],273575788,[25,26,27,28],"双线性变换是一种非线性变换","双线性变换可以用来进行数字频率与模拟频率间的变换","双线性变换把s平面的左半平面单值映射到z平面的单位圆内","以上说法都不对","以下对双线性变换的描述中不正确的是","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],273575789,[36,37,38,39],"双线性变换法的优点是数字频率和模拟频率成线性关系","脉冲响应不变法无频率混叠现象","双线性变换法只适合设计低通、带通滤波器","脉冲响应不变法不适合设计高通滤波器","下面关于IIR滤波器设计说法正确的是",{"answer":42,"createTime":5,"id":6,"options":43,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":30,"type":31},[],273575791,[48,49,50,51],"脉冲响应不变法","双线性变换法","窗函数法","频率采样法","方法设计的IIR数字滤波器会造成频率的非线性变换(Ω与ω的变换关系)",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":30,"type":31},[],273575792,[57,58,59,60],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb6e77d61e6dab8739d8f059c3f402b48.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa48c5385a3b893e27cfcb159aaa81d9a.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F6bf8abb0c68b1ddfb3a86d8ecab1d01d.webp\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fa7254b49f27e3336efa38338ab97a5fc.webp\">","设FIR滤波器单位脉冲响应\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ffc9a513a01d9bfe8a96b857be1c0dfd9.webp\">是实序列,长度为N,且满足\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F85da88d13e91f1796575ab9105a750f7.webp\">,则该滤波器的相位函数\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd26194ffffb018f498821ff6d1010039.webp\">为",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":30,"type":31},[],273575793,[66,67,68,69],"N\u002F2","\u002F2","-1","不确定","若数字滤波器的单位脉冲响应h(n)是对称的,长度为N,则它的对称中心是",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],273575794,[75,76,77,78],"h[n]=-h[M-n]","h[n]=h[M+n]","h[n]=-h[M-n+1]","h[n]=h[M-n+1]","已知某FIR滤波器单位抽样响应h(n)的长度为(M+1),则在下列不同特性的单位抽样响应中可以用来设计线性相位滤波器的是( )",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],273575795,[84,85,86,87],"Ⅰ、Ⅱ","Ⅱ、Ⅲ","Ⅲ、Ⅳ","Ⅳ、Ⅰ","线性相位FIR滤波器主要有以下四类(Ⅰ)h(n)偶对称,长度N为奇数 (Ⅱ)h(n)偶对称,长度N为偶数(Ⅲ)h(n)奇对称,长度N为奇数 (Ⅳ)h(n)奇对称,长度N为偶数则其中不能用于设计高通滤波器的是( )",{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":30,"type":31},[],273575796,[93,94,95,96],"1\u002F8","1\u002F4","1","4","在窗函数法的FIR滤波器设计法中,滤波器过渡带宽度近似等于______倍的窗函数频谱的主瓣宽度.( )",{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":30,"type":31},[],273575797,[102,103,104,105],"窗函数的截取长度增加,则主瓣宽度减小,旁瓣宽度减小","窗函数的旁瓣相对幅度取决于窗函数的形状,与窗函数的截取长度无关","为减小旁瓣相对幅度而改变窗函数的形状,通常主瓣的宽度会增加","窗函数法不能用于设计FIR高通滤波器","下列关于窗函数设计法的说法中错误的是( )"]