What is an anti aliasing filter? Why is it required?
- 6 Answers
- 14098 Views
- Honeywell, I also Faced
- E-Mail Answers
Answer Posted / mani_drvsv
Anti aliasing filter reduces errors due to aliasing. If a
signal is sampled at 8 kS/S, the max frequency of the input
should be 4 kHz. Otherwise, aliasing errors will result.
Typically a 3.4kHz will have an image of 4.6 khz, and one
uses a sharp cut off filter with gain of about 1 at 3.4kHz
and gain of about 0.01 at 4.6 kHz to effectively guard
against aliasing. Thus one does not quite choose max
frequency as simply fs/2 where fs is sampling frequency.
One has to have a guard band of about 10% of this fmax, and
chooses max signal frequency as 0.9*fs/2
| Is This Answer Correct ? | 31 Yes | 4 No |
Post New Answer View All Answers
Explain the different types of AM, FM along with the Diagrams on the paper.
Express the discrete time signal x(n) as a summation of impulses.
Using four cascaded counters with a total of 8 bits, how many states must be deleted to achieve a modulus of 20,000?
What is line of sight?
What is the condition to be satisfied for stability?
Explain the various methods of representing discrete time signal
What is linear and nonlinear systems?
What are recursive and non recursive systems?
Tell me the role of a car driver as one of a feedback mechanism.
What is discrete time system?
Write the expression for discrete convolution.
What is impulse response? Explain its significance.
Tell me the steps involved in demodulating a signal.
What is the importance of causality?
Define circular convolution.
