analog & digital filter and it some kind , usage & some application analog & digital filter and it some kind , usage & some application

1. ASAD ALI

2. Digital
Signal
Processing

3. FILTER AND
APPLICATION

4. FILTER And APPLICATION
 Introduction
 Frequency selective
 Digital Filter
 Application

5. Introduction
 what are Filters
 A filter is a device or process that removes some
unwanted components or features from a signal
 filter is a system that lets input signal components with
some frequencies pass with little change, while
essentially eliminating input signal components with
other frequency
 Filters are designed to achives the desires frequencies

6.  Frequency Selective Filters
Frequency selective filters pass signals with frequency
components in some band While they attenuate signals
containing frequency in other frequency bands.
 Lowpass Filter
 Highpass Filter
 Bandpass Filter
 Bandstop Filter

7. Low-pass filter
A low-pass filter (LPF) is a filter that passes signals with a frequency lower
than a selected cutoff frequency
Low-pass filter passes all
Signal components having frequency less than ww radian per second with no
distortion and completely attenuates signal components having frequencies
greater than wc Hz
-wc wc
w
(w)
w

8. High-pass filter
 High-Pass filter passes all signal components greater than ww radian per second with no
distortion and completely attenuates signal components having frequencies less than ww
radian per second.
Band-pass Filter
Band pass filter passes all signal components having frequencies in a band of B centered at
the frequency w0 with no distortion and completely attenuates signal components having
frequencies outside this band.
Band-Stop Filter
Band stop filter is a filter that completely stops all signal components having frequencies in a
band of B

9. Ideal Filter

10. Digital Filter
 IIF (infinite impulse Response)
 FIR (Finite impulse Response)
 Infinite Impulse Response
 Infinite impulse response (IIR) is a property applying to many linear time-invariant
systems. ... Systems with this property are known as IIR systems or IIR filters, and
are distinguished by having an impulse response which does not become exactly
zero past a certain point, but continues indefinitely
yn = b0xn + b1xn-1 + …. + bMxn-M + a1yn-1 + … + aPyn-P

11. Finite Impulse Response (FIR)
 FIR filters can have an exactly linear phase response. The implication of this is
that no phase distortion is introduced into the signal by the filter.
 Where as the phase response of IIR filters is non linear, especially at the band
edges
 In FIR the number of filter coefficients is not too large and in particular little
or no phase distortion is desired.
 yn = b0xn + b1xn-1 + …… + bMxn-M

12. FILTER`S
APPLICATION

13.  In aspect to application filter can be devided in two catagries
 Analog Filter
 Digital Filter
 Analog Filter
 Analog filter are used to remove the undesired frequencies from audio signal
 It is also remove the noise from signal
 It is used for preventing of signal-Noise-Ratio in multiple stage amplification
 These are used in Radios , TVs and radar Communication
 Telephone and Sampling systems also in Audio equipment

14. Digital Filter
 There are many application of Digital Filter
 They are provides accurate Response as compare to analog
filter
 They also Remove undesired frequenices in digitized form
 IIR filter worked faster and required less memory space
 They are provides Linear phase
 These are done in order to improve the efficiency of the
processing