PPT - Digital Filters | Signals and Systems - Electronics and Communication Engineering (ECE) PDF Download

 Page 1


Department of Microelectronics,
Indian Institute of Information Technology, Allahabad
SUBMITTED BY:
Prashant singh(imi2011003)
Rahul Patidar(imi2011011)
Page 2


Department of Microelectronics,
Indian Institute of Information Technology, Allahabad
SUBMITTED BY:
Prashant singh(imi2011003)
Rahul Patidar(imi2011011)
?
Introduction 
?
Classification 
?
Types
?
Structures
?
Digital Vs Analog filters
?
Refrences 
Page 3


Department of Microelectronics,
Indian Institute of Information Technology, Allahabad
SUBMITTED BY:
Prashant singh(imi2011003)
Rahul Patidar(imi2011011)
?
Introduction 
?
Classification 
?
Types
?
Structures
?
Digital Vs Analog filters
?
Refrences 
?
Electronic circuits which perform signal processing functions, 
remove unwanted frequency component, to enhance wanted ones, 
or both.
?
Digital filter-Performs mathematical operations on a 
sampled,discrete time signal to reduce or enhance certain aspects 
of that signal.
?
Filters generally do not add frequ-
   ency components to a signal.
?
Boost or attenuate selected frequ-
   ency regions.
Digital Filtering
Page 4


Department of Microelectronics,
Indian Institute of Information Technology, Allahabad
SUBMITTED BY:
Prashant singh(imi2011003)
Rahul Patidar(imi2011011)
?
Introduction 
?
Classification 
?
Types
?
Structures
?
Digital Vs Analog filters
?
Refrences 
?
Electronic circuits which perform signal processing functions, 
remove unwanted frequency component, to enhance wanted ones, 
or both.
?
Digital filter-Performs mathematical operations on a 
sampled,discrete time signal to reduce or enhance certain aspects 
of that signal.
?
Filters generally do not add frequ-
   ency components to a signal.
?
Boost or attenuate selected frequ-
   ency regions.
Digital Filtering
?
Magnitude response consideration.
?
Four basic types of ideal filters with magnitude responses as shown 
below
p
1
  ?
0
  
?c
  
–
?c
H
LP
(e
j
?
)
- p
p
  ?
0
  
?c
  
–
?c
1
H
HP
(e
j
?
)
- p
p - p
  ?
1
1
–
  
–
?c1
  
?c1
  
–
?c2
  
?c2
H
BP
(e
j
?
)
- p p
  ?
1
  
–
?c1
  
?c1
  
–
?c2
  
?c2
H
BS
(e
j
?
)
Page 5


Department of Microelectronics,
Indian Institute of Information Technology, Allahabad
SUBMITTED BY:
Prashant singh(imi2011003)
Rahul Patidar(imi2011011)
?
Introduction 
?
Classification 
?
Types
?
Structures
?
Digital Vs Analog filters
?
Refrences 
?
Electronic circuits which perform signal processing functions, 
remove unwanted frequency component, to enhance wanted ones, 
or both.
?
Digital filter-Performs mathematical operations on a 
sampled,discrete time signal to reduce or enhance certain aspects 
of that signal.
?
Filters generally do not add frequ-
   ency components to a signal.
?
Boost or attenuate selected frequ-
   ency regions.
Digital Filtering
?
Magnitude response consideration.
?
Four basic types of ideal filters with magnitude responses as shown 
below
p
1
  ?
0
  
?c
  
–
?c
H
LP
(e
j
?
)
- p
p
  ?
0
  
?c
  
–
?c
1
H
HP
(e
j
?
)
- p
p - p
  ?
1
1
–
  
–
?c1
  
?c1
  
–
?c2
  
?c2
H
BP
(e
j
?
)
- p p
  ?
1
  
–
?c1
  
?c1
  
–
?c2
  
?c2
H
BS
(e
j
?
)
?
Depending on the form of the filter equation 
(a) Linear filters versus nonlinear filters. 
(b) Time-invariant filters versus time-varying filters. 
(c) Adaptive filters versus non-adaptive filters. 
(d) Recursive versus non-recursive filters. 
?
Depending on the structure of implementation
(a) Direct-form, cascade-form, parallel-form and lattice structures.