《数字信号处理》期末考试卷参考答案(T6A级).docVIP

☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆ 湖北汽车工业学院Digital Signal Processing考试试卷(A题) 课程编号 080060 考试形式 闭 考试日期 2008. 01. 09 题号 一 二 三 四 五 六 总分 得分 40 12 12 12 12 12 阅卷 1. Direction: Fill the best answer into the bracket for each of the following sentences.(2’ (20=40’) (1). The z-transform of the unit step sequence μ[n] is ( ). (2). The DTFT of δ[n-2] is ( ). (3). Specify the ROC of to be , then the inverse z-transform of is ( ). (4). The ROC of the z-transform of the sequence x[n] = 0.2nμ[n] + 0.3nμ[-n-1] is ( ). (5). An FIR discrete-time LTI system is always ( ). (6). Let X[k] be the 8-point DFT of an 8-point real sequence x[n], and it is known that X[0] = 12, X[1] = -1 +j3, X[2] = 3 + j4, X[3] = 1 – j5, X[4] = 4, X[5] = 1 + j5, X[7] = -1 – j3, then X[6] = ( ). (7). The linear convolution of g[n] and h[n] is yL[n] = {1, 2, 3, 4, 5, 6}, The 5-point circular convolution of g[n] and h[n] is yC[n] = ( ). (8). A causal LTI discrete-time system is described by the difference equation: , its unit impulse response h[n] = ( ). (9). For an LTI discrete-time system with its frequency response , if the input sequence is x[n] =, the corresponding steady-state response is y[n] = ( ). (10). The DTFT of a sequence x[n] is denoted as , then the DTFT of the time shifted version x[n-1] of x[n] is ( ). (11). We can use three basic operations to construct an arbitary complicated discrete-time LTI system. These three basic operations are addition, ( ) and unit delay. (12). A causal LTI discrete-time system is described by the difference equation , then the transfer function is ( ). (