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Differences - Digital Signal Processing Notes | Study Signals and Systems - Electronics and Communication Engineering (ECE)

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Differances

UNIT-V

Non Recursive filtersRecursive filters

Differences - Digital Signal Processing Notes | Study Signals and Systems - Electronics and Communication Engineering (ECE)

for causal system

Differences - Digital Signal Processing Notes | Study Signals and Systems - Electronics and Communication Engineering (ECE)

For causal i/p sequence 

Differences - Digital Signal Processing Notes | Study Signals and Systems - Electronics and Communication Engineering (ECE)

It gives FIR o/p. All zero filter. Always stable.

Differences - Digital Signal Processing Notes | Study Signals and Systems - Electronics and Communication Engineering (ECE)  

for causal system

Differences - Digital Signal Processing Notes | Study Signals and Systems - Electronics and Communication Engineering (ECE)

It gives IIR o/p but not always.

Ex: y(n) = x(n) – x(n-3) + y(n-1)

General TF : H(z) =  Differences - Digital Signal Processing Notes | Study Signals and Systems - Electronics and Communication Engineering (ECE)

bk = 0 for Non Recursive

Nf= 0 for causal system

 

FIR filtersIIR filters
1. Linear phase no phase distortion.Linear phase, phase distortion.
2. Used in speech processing, data transmission & correlation processingGraphic equalizers for digital audio, tone generators filters for digital telephone
3. Realized non recursively.Realized recursively.
4. stable

Stable or unstable.

H(n) = an u(n)   a<1 stable

=  0          a>1 unstable

5. filter order is moreLess
6. more co-efficient storageLess storage
7. Quantization noise due to finite precision arithmetic can be made negligibleQuantization noise
8. Co-efficient accuracy problem isMore
less severe 
9. used in multirate DSP (variable sampling rate) 

 

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