Date post: | 01-Jan-2016 |
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FILTER DESIGN
GROUP MEMBERS
• NIDA SAFDAR 07-CP-64• ZUNAIRA NAEEM 07-CP-66• MEHAK ARSHAD 07-CP-78
PRESNTATION LAYOUT
• Filters• Types of filters• Applications• Filter design• Design
requirements
• Causality• Stability• Locality • Frequency
function• Impulse response
WHAT IS A FILTER?
TYPES OF FILTER
• Analogue• Digital
ANALOGUE FILTERS
• Handles continuous time signals• Direct manipulation of input
DIGITAL FILTERS
• Handles discrete time signals• Manipulation of analogue signals
TYPES OF DIGITAL FILTERS
• FIR• IIR
APPLICATIONS
• Communicating systems• Audio systems• Noise reduction• Video signal enhancement• Graphic equalizers• Others
FILTER DESIGN
• The process• Compromises in ideal design• Applications
DESIGN REQUIREMENTS
• Causality• Stability• Locality• Frequency function• Impulse response
CAUSALITY
• Definition• Causal filters• A-causal filters• Anti-causal filters• Realizable causal filters
CAUSALITY DIAGRAM
STABILITY
• Definition• BIBO• Stable filters• Instable filters• Realizable stable filters• Significance
LOCALITY
• Definition• Locality in filters• Locality in Fourier transform
FREQUENCY FUNCTION
• Definition - Filter order
• Weighting function
CONT’D…
• Examples– High pass filter– Low pass filter– Band pass filter– All pass filter
IMPULSE RESPONSE
• Definition• Mathematical Representation
y[n]=b0x[n]+b1x[n-1]+…+bnx[n-N]
y[n]=∑ i=0->Nbix[n-i]
CONT’D…
• Applications- Loudspeaker- Digital filters- Radar- Broadband
RELATIONSHIP b/w IMPULSE AND FREQUENCY
• Direct correspondence• Relationship
REFERENCES
Web references
• www.wikipedia.org• www.filtersfilters.com• www.infovisual.com• www.soundsonsound
s.com• www.wipath.com
Book references
• SIGNALS AND SYSTEMS
Oppenhiem Willsky
• SIGNAL PROCESSING FIRST
Macllelan
QUESTIONING
NOT ALLOWED
THANK YOU