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

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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.
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FAQs on PPT - Digital Filters - Signals and Systems - Electronics and Communication Engineering (ECE)

1. What is a digital filter?
Ans. A digital filter is a system designed to process digital signals and modify their characteristics. It is used to remove unwanted noise or distortions from the signal or to enhance specific frequency components.
2. What are the advantages of using digital filters over analog filters?
Ans. Digital filters offer several advantages over analog filters. They can be easily implemented using software or hardware, allowing for flexibility and ease of modification. Digital filters also have better precision, accuracy, and stability, and can handle a wide range of signal frequencies.
3. How do digital filters work?
Ans. Digital filters work by applying mathematical operations to a discrete-time signal. They typically operate on a sequence of input samples and generate a sequence of output samples. The filter coefficients determine the characteristics of the filter, such as the cutoff frequency and filter response.
4. What are the different types of digital filters?
Ans. There are various types of digital filters, including finite impulse response (FIR) filters and infinite impulse response (IIR) filters. FIR filters have a finite impulse response and provide a linear phase response, while IIR filters have an infinite impulse response and can achieve sharper roll-off characteristics.
5. How can digital filters be applied in real-world applications?
Ans. Digital filters find applications in various fields, such as audio processing, image processing, telecommunications, and biomedical signal analysis. They can be used to remove noise from audio recordings, enhance image quality, extract specific frequency components from signals, and analyze physiological data in healthcare systems.
32 videos|76 docs|63 tests
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