数字信号处理（全英文）答案2023秋

第七章测试

1.A widely used approach to IIR filter design is based on the conversion of a prototype analog transfer function to a digital transfer function.（ ）
A:对 B:错
答案:A
2.Digital filters are very important part of DSP, which has two uses: signal separation and signal restoration.（ ）
A:错 B:对 3.For a practical digital filter, the magnitude response in the passband and in the stopband are of no any acceptable tolerances. （ ）
A:对 B:错 4.The magnitude frequency characteristic curve of a digital filter is shown in the below figure, indicating that the filter type is （ ）.

A:high-pass filter B:band-stop filter C:band-pass filter D:low-pass filter 5.For digital filter design, normalized bandedge frequencies need to be computed from specifications in Hz using the formula .（ ）
A:对 B:错 6.As for the properties of the Butterworth low-pass filler, which are correct for the following statements？ （ ）
A:As the filter order increases, the characteristics become sharper. B:The magnitude response is a monotonically decreasing. C:The DC gain of the filter is unity for any order D:The 3-dB bandwidth is unrelated to the filter order. 7.The magnitude frequency response of Chebyshev filters is of equiripple characteristics in both the passband and stopband.（ ）
A:对 B:错 8.By looking up the known table according to the order N , we can obtain the normalized transfer function H_a(p) , which is independent to 3dB cutoff frequency Ω_c . （ ）
A:对 B:错 9.As for the impulse invariance transformation of IIR digital filter, the analog frequencies and digital frequencies are related by linear relationship .（ ）
A:错 B:对 10.The aliasing distortion is unavoidable in the impulse invariance transformation.（ ）
A:错 B:对 11.As for the bilinear transformation of IIR digital filter, it is a many-to-one mapping relationship from s-plane to z-plane.（ ）
A:错 B:对 12.As for the bilinear transformation of IIR digital filter, transform transfer function H_a(s) of analog filter into transfer function H(z) of digital filter by the formula （ ）.
A: B: C: D: