Interested to Buy Any Domain ? << Click Here >> for more details...
What is an anti aliasing filter? Why is it required?
- 6 Answers
- 15849 Views
- Honeywell, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / 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 |
Answer / harshgandhi126
If we sample the signal below the Nyquist Frequency then
aliasing occurs. So, to remove this aliasing we use filter
before sampling the signal.This filter will not allow the
freuency greater than the Nyquist Frequency.
| Is This Answer Correct ? | 20 Yes | 0 No |
Answer / jilani
anti aliasing filter is a low pass filter which is used to
remove the high frequency distortions in the i/p signal
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / guest
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 ? | 2 Yes | 0 No |
Answer / nuts
anti aliasing filter band limits the input signal such that there is no frequency component higher than W Hz (say) in input signal, thus reduces the chances of aliasing after sampling.
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / guest
The anti aliasing filter is second id of any person.Its halp
fof know the person.so we can say that its very impotant.
| Is This Answer Correct ? | 0 Yes | 24 No |
Define circular convolution.
What is impulse response? Explain its significance.
What is the importance of linear and circular convolution in signals and systems?
classifying discrete time systems.
What do you mean by radio environment in building?
what is Digital Signal processing?
Why is digital communication better than analogue communication?
Explain the various methods of representing discrete time signal
Is the Gibbs phenomenon ever a factor?
How is the non-periodic nature of the input signal handled?
Define cross correlation and auto-correlation?
What are recursive and non recursive systems?
86 Family 
