Question 2
Marks : +2 | -2
Pass Ratio : 100%
Which of the following expressions define the dead band for a single-pole filter?
Explanation: Since the quantization product av(n-1) is obtained by rounding, it follows that the quantization error is bounded as
Question 3
Marks : +2 | -2
Pass Ratio : 100%
In recursive systems, which of the following is caused because of the nonlinearities due to the finite-precision arithmetic operations?
Explanation: In the recursive systems, the nonlinearities due to the finite-precision arithmetic operations often cause periodic oscillations to occur in the output even when the input sequence is zero or some non zero constant value.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The limit cycle mode with zero input, which occurs as a result of rounding the multiplications, corresponds to an equivalent second order system with poles at z=±1.
Explanation: There is an possible limit cycle mode with zero input, which occurs as a result of rounding the multiplications, corresponds to an equivalent second order system with poles at z=±1. In this case the two pole filter exhibits oscillations with an amplitude that falls in the dead band bounded by 2-b/(1-|a1|-a2).
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Zero input limit cycles occur from non-zero initial conditions with the input x(n)=0.
Explanation: When the input sequence x(n) to the filter becomes zero, the output of the filter then, after a number of iterations, enters into the limit cycle. The output remains in the limit cycle until another input of sufficient size is applied that drives the system out of the limit cycle. Similarly, zero input limit cycles occur from non-zero initial conditions with the input x(n)=0.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is true when the response of the single pole filter is in the limit cycle?
Explanation: We note that when the response of the single pole filter is in the limit cycle, the actual non-linear system acts as an equivalent linear system with a pole at z=1 when the pole is positive and z=-1 when the poles is negative.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Limit cycles in the recursive are directly attributable to which of the following?
Explanation: The oscillations in the output of the recursive system are called as limit cycles and are directly attributable to round-off errors in multiplication and overflow errors in addition.