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(a) Dx (x 4 ) = Dx (x 3 x) algebra ua ub = ua+b = x 3 Dx (x) + x Dx (x 3 ) = x 3 (1) + x(3x 2 ) = x 3 + 3x 3 = 4x 3 (b) Dx (x 5 ) = Dx (x 4 x) = x 4 Dx (x) + x Dx (x 4 ) = x 4 (1) + x(4x 3 ) = x 4 + 4x 4 = 5x 4 (c) Dx ((x 3 + x)(x 2 x + 2)) = (x 3 + x) Dx (x 2 x + 2) + (x 2 x + 2) Dx (x 3 + x) = (x 3 + x)(2x 1) + (x 2 x + 2)(3x 2 + 1) [by the product rule] [by example (a)] and ua = ua b ub

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If a discrete-time filter is designed using impulse invariance with T, = 1, find H ( z ) .

Fig. 7-30

( a ) Assuming that this filter was designed using impulse invariance with T, = 2, find the system function of two different analog filters that could have been the analog filter prototype. ( b ) If this filter was designed using the bilinear transformation with T, = 2, find the analog filter that was used as the prototype. 9.67

PRINCIPLE 1:

The system function of an analog filter Ha(s)may be expressed as a parallel connection of two lower-order systems

The length of the altitude to the hypotenuse of a right triangle is the mean proportional between the lengths of the segments of the hypotenuse.

[by the product rule]

If Ha(s),Hal(s), Ha2(s)are mapped into digital filters using the impulse invariance technique, will it be true that and

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Thus in right nABC (Fig. 7-31),

If an analog filter has an equiripple passband, will the digital filter designed using the impulse invariance method have an equiripple passband Will it have an equiripple passband if the bilinear transformation is used Can an analog allpass filter be mapped to a digital allpass filter using the bilinear transformation An IIR low-pass digital filter is to be designed to meet the following specifications: Passband cutoff frequency of 0.221~ a passband ripple less than 0.01 with Stopband cutoff frequency of 0.241~ a stopband attenuation greater than 40 dB with

Fig. 7-31

(a) Determine the filter order required to meet these specifications if a digital Butterworth filter is designed using the bilinear transformation.

9.70 9.71

The reader may have noticed a pattern in the derivatives of the powers of x: Dx (x) = 1 = 1 x 0 Dx (x 2 ) = 2x Dx (x 3 ) = 3x 2 Dx (x 4 ) = 4x 3 Dx (x 5 ) = 5x 4

PRINCIPLE 2:

Su(n - k ) =

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In a right triangle, the length of either leg is the mean proportional between the length of the hypotenuse and the length of the projection of that leg on the hypotenuse.

which is unbounded. Therefore, this system is unstable. Finally, because h k ( n ) = 0 for n < k , the system is causal. Consider a linear system that has a response to a delayed unit step given by

Thus in right nABC (Fig. 7-31),

That is, s k ( n ) is the response of the linear system to the input x ( n ) = u ( n - k ) . Find the response of this system to the input x ( n ) = 6 ( n - k ) , where k is an arbitrary integer, and determine whether o r not this system is shift-invariant, stable, o r causal. Because this system is linear, we may find the response, h k ( n ) ,to the input &(n- k ) as follows. With &(n- k ) = u(n - k ) - u(n - k - I), using linearity it follows that

This pattern does in fact hold for all powers of x. RULE 4. Dx (x n ) = nx n 1 where n is any positive integer. For a proof, see Problem 12.2. EXAMPLES

Fig. 7-32

which is shown below:

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