In this presentation we described about Signal Filtering. If you have any query regarding signal filtering or this presentation then feel free to contact us at: http://www.siliconmentor.com/

1. Signal Filtering

2. Introduction
• Most of the signals we deal with in real life get
corrupted in some way or another by some
unwanted signals.
• For the purpose of signal processing and
analysis, it is imperative to get rid of these
interferences, or at least reduce their effects.
• This is achieved through applying Signal
Filtering techniques.

3. What are filters?
• A Filter is an electronic circuit that
removes/attenuates, from a signal, some
unwanted component or feature.

4. Common used terms
• Cut off frequency : this is the frequency that
define the limits of the filter range.
• Stop band : The range of frequencies that is
filtered out
• Pass band : The range of frequencies which is let
through and recorded
• Transistion band : region that separates the
passband and stopband

5. Types of filters
Less accuracy
Non-Linear Phase
Adaptive Filters Difficult
Analog filters required at high frequencies
No ADC,DAC or DSP required.
Analog filters

6. High Accuracy
Linear Phase (FIR Filters)
Flexible, Adaptive Filtering Possible
Easy to Simulate and Design
Requires High Performance ADC,DAC & DSP
Digital Filters

7. Linear time invariant filters
A class of linear filters whose behavior does not
change over time
Linearity implies that the filter meets the scaling
and superposition properties
Two types
• 1.FIR filter
-Operates only on previous values of the input
• 2.IIR filter
-Operates on previous values of input and output

8. Filters on the basis of structure
• Direct form

9. • Cascade form

10. • Parallel form

11. Filter Application
• Eliminate background noise
• Radio tuning to a specific frequency
• Direct particular frequencies to different
speakers
• Modify digital images
• Remove specific frequencies in data analysis

12. • This presentation is created by the Digital signal
processing researcher of SiliconMentor.
SiliconMentor is a leading research organization.
SiliconMentor deals in various domains like
Digital Signal Processing, Image processing,
FPGA, VLSI etc.
• We also assist PhD and M.tech students in their
Projects and thesis work. If you any query feel
free to contact us.

13. About Us
• Company: SiliconMentor
• Website: http://www.siliconmentor.com/

14. Thank You