Question 4
Marks : +2 | -2
Pass Ratio : 100%
Which of the following techniques of designing IIR filters do not involve the conversion of an analog filter into digital filter?
Explanation: Except for the impulse invariance method, the design techniques for IIR filters involve the conversion of an analog filter into a digital filter by some mapping from the s-plane to the z-plane.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Using which of the following methods, a digital IIR filter can be directly designed?
Explanation: There are several methods for designing digital filters directly. The three techniques are Pade approximation and least square method, the specifications are given in the time domain and the design is carried in time domain. The other one is least squares technique in which the design is carried out in frequency domain.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Which of the following conditions are in the favor of Pade approximation method?
Explanation: The Pade approximation method results in a perfect match to Hd(z) when the desired system function is rational and we have prior knowledge of the number of poles and zeros in the system.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The degree to which the design technique produces acceptable filter designs depends in part on the number of filter coefficients selected.
Explanation: The degree to which the design technique produces acceptable filter designs depends in part on the number of filter coefficients selected. Since the design method matches hd(n) only up to the number of filter parameters, the more complex the filter, the better the approximation to hd(n).