f(k)=k(k—1)u(k—1)
举一反三
- 若y(k)=f(k)*h(k),则y(k一1)=f(k一1)*h(k一1)()。
- x(k 2) 2x(k 1) x(k) = u(k),x(0)=0,x(1)=0,u(k)=k (k=0,1,2,…),符合描述的选项为()。_
- 已知离散时间信号f(k)=u(k)−u(k−M),M为正整数,则f(k)*f(k)的非零序列长度为_____。 A: 2M−1 B: 2M+1 C: 2M+2 D: 2M
- 若某离散LTI系统的单位脉冲响应[img=281x39]18034efdc9f5f19.png[/img],则描述该系统的差分方程为_____。 A: y(k−1)=4f(k)−f(k−1) B: y(k)+0.25y(k−1)=0.25f(k−1) C: y(k)−0.25y(k−1)=f(k) D: y(k)−0.25y(k−1)=−0.25f(k−1)
- 牛顿迭代法的迭代格式以下正确的是: A: ${x_{k + 1}} = {x_k} - {{f({x_k})} \over {f'({x_k})}},k = 0,1, \cdots $ B: ${x_{k + 1}} = {x_k} - {{f'({x_k})} \over {f({x_k})}},k = 0,1, \cdots $ C: ${x_{k + 1}} = {x_k} - {{f'({x_{k + 1}})} \over {f({x_k})}},k = 0,1, \cdots $ D: ${x_{k + 1}} = {x_k} - {{f({x_{k + 1}})} \over {f'({x_k})}},k = 0,1, \cdots $