山东大学2017-2018学年2学期数字信号处理（双语）课程试卷(A) 3)(5 pts)Determine the group delay for0<<for the following sequence 5)(10 pts)The following figure is the impulse response of a FIR system,please determine the -()"+( a system function H(z)and draw the signal flow graph of direct form structure with the number of coefficient multipliers should be smallest. 签 家 4)(5 pts)If (z)= 1-2 1-2 -for >0,is the corresponding LTI system causal and stable?Justify your answer. 6)(10 pts)Draw the signal flow graph for an 8-point decimation-in-frequency FFT algorithm with normal ordering of the input time sequence x[n]and bit-reversed ordering of the output sequence X[k]. 器 第2项共5页2017-2018 2 数字信号处理（双语） （A） 2 5 3) (5 pts) Determine the group delay for 0 < ω< π for the following sequence 4) (5 pts) If , is the corresponding LTI system causal and stable? Justify your answer. 5) (10 pts) The following figure is the impulse response of a FIR system, please determine the system function H(z) and draw the signal flow graph of direct form structure with the number of coefficient multipliers should be smallest. 6) (10 pts) Draw the signal flow graph for an 8-point decimation-in-frequency FFT algorithm with normal ordering of the input time sequence x[n] and bit-reversed ordering of the output sequence X[k]