III Year DSP BITS

                            Digital Signal Processing (DSP)

                                   JNTUH Second mid Bits

                                                 UNIT-5

SECTION-I: Multiple choice questions

1.  The impulse invariant mapping and bilinear mapping are  [  d  ]

( a ) both are many-to-one mapping ( b ) both are one-to-one mapping

( c ) one- to- one and many-to-one mapping respectively

( d ) many-to-one and one- to-one mapping

2.  In Chebyshev approximation, at the cutoff frequency,the normalized magnitude response has a value of      [ a]

3.  The two properties which are preserved in analog to digital transformation are [  c  ]

( a ) linearity and stability ( b ) linearity and causality

( c ) stability and causality ( d ) time in variant and linearity

4.  A mapping from the S-Plane to the Z-Plane called [ c]

(a) Laplace Transform (b) Z-Transform (c) Bilinear Transform (d) None

5.  In which filters exhibit equiripple behavior in the pass band and a monotonic characteristics in the stop band [ b ]

(a) Butterworth (b) Type I Chebyshev (c) Type 2 Chebyshev (d) Elliptic

6.  How many types of chebyshev filters are there?   [ b  ]

(a) 4 (b) 2 (c) 3 (d) 6

7.   The digital frequency in bilinear transformation is [ b ]

8.  In chebyshev filter, the alternation constant is [a ]

9.  The ratio (Ω₂)/(Ω₁) for impulse invariant transformation is   (a)

_(a)      (W₁) / (w2)   (b) (w₁)/(w)   (c) (w)/(w₂)   (d) (w₁)/(w₂)

10.  The normalized magnitude response of chebyshev    type-I filter has a value of ________ at the cutoff frequency Ω  (c )

Section-II: Fill in the blanks

1.In impulse invariant mapping the left half poles of s-plane are mapped into

 Interior  of unit circle in z-plane

2. The poles of the butterworth transfer function symmetrically lies on an unit circle in s-lane with

angular spacing of  π/N

3. The frequency response of the Butterworth filter Decreases monotonically with  Increasing Ω and as the filter order increases, the transition band become narrower.

4. Impulse invariance method is not suitable for  HIGH PASS

5.  Bilinear Transformation can pressure the magnitude response of an analog filter, but the phase response of the analog filter cannot be pressured

6. A linear phase analog filter cannot be transformed to a linear phase digital filter using bilinear transformation.

                                                                                                Prepared by

                                                                                                                        B.SRIDHAR