Howtosignalprocessing
- What is the filter used for anti-aliasing?
- Can a square wave be sampled?
- What is the need for anti-aliasing filter prior to downsampling?
- What is anti-aliasing and anti imaging filter?
What is the filter used for anti-aliasing?
An anti-aliasing filter is effectively a low-pass filter that is placed on the input of an analog-digital converter (ADC). In theory, any type of active low-pass filter with unity gain can be used as an anti-aliasing filter.
Can a square wave be sampled?
Square waves are equivalent to a sine wave at the same (fundamental) frequency added to an infinite series of odd-multiple sine-wave harmonics at decreasing amplitudes. Computer algorithms exist which are able to sample waveshapes and determine their constituent sinusoidal components.
What is the need for anti-aliasing filter prior to downsampling?
Expert-Verified Answer. An "anti - aliasing" or "anti-imaging" channel / filter is set before the A-to-D converter, to counteract / prevent flag frequencies more noteworthy than a large portion of the testing rate from being digitized, which would create pictures at undesirable frequencies.
What is anti-aliasing and anti imaging filter?
In the reverse process to aliasing, anti-imaging (or reconstruction) filters are used at the output of a sampled system to eliminate spectral images of the desired signal at harmonics of the sample rate. The ideal filter specification is the same as that for the anti-aliasing filter.
