SIMULATION OF QUADRATURE MIRROR FILTER - welcome to our blog that presents the full content How Gadget, the discussion this time we're discussing that you find that SIMULATION OF QUADRATURE MIRROR FILTER, we have provided complete information with images that are easy to understand, the explanation is simple but complete, therefore please read until the end :)

This is about : SIMULATION OF QUADRATURE MIRROR FILTER
And this article : SIMULATION OF QUADRATURE MIRROR FILTER

SIMULATION OF QUADRATURE MIRROR FILTER

SIMULATION OF QUADRATURE MIRROR FILTER

AIM:

To simulate the frequency response of quadrature mirror for a two channel filter band.

THEORY:

The QMF filter is used in the sub-band coding. This filter can be used for reducing aliasing. This is a multirate digital filter structure that employes 2 decimeter in signal synthesis section. The low pass and high pass filters in the analysis section have impulse response filters (n) and (n) respectively.

Similarly the low pass filter and high pass filters contained in the synthesis section have impulse response filters (n) and (n) respectively. To reduce aliasing the synthesis section have impulse response (n) and (n) respectively,

(ω)= (ω)

(ω)=- (ω-π)

Since (ω) and (ω)is a mirror image filters

H0(ω)=H(ω)

H1(ω)=H(ω- π)

G0(ω)=2H(ω)

This is due to the above design, aliasing effects cancels.

ALGORITHM:

1. Generate the low pass filter

2. Generate the high pass filter

3. Compute the gain response of two filters

4. Plot the gain response of two filters.

QUADRATURE MIRROR FILTER:

X(ω)

FILTER CHARACTERISTICS FOR SUB-BAND CODING

Gain

H0 (ω) H1 (ω)

PROGRAM

####################################################

clc;

clear all;

%generation of complimentary lpf

b1=fir1(50,0.5);

%generation of complimentary hpf

l=length(b1);

for k=1:l

    b2(k)=((-1)^k)*b1(k)

end

%computation of gain response of two filters

[H1Z,W]=freqZ(b1,1,256);

H1=abs(H1Z);

g1=20*log10(H1);

[H2Z,W]=freqZ(b2,1,256);

H2=abs(H2Z);

g2=20*log10(H2);

%PLOT OF GAIN RESPONSE OF TWO FILTERS

plot((W*180)/pi,g1,'-',(W*180)/pi,g2,'-');

grid on

xlabel('normalized freq');

ylabel('gain');

#############################################################

RESULT:

 Thus the frequency response of quadrature mirror filter for a two channel filter bands was simulated.

Information SIMULATION OF QUADRATURE MIRROR FILTER has been completed we present

A few of our information about the SIMULATION OF QUADRATURE MIRROR FILTER, we hope you benefit from this article

You have just read the article SIMULATION OF QUADRATURE MIRROR FILTER and many articles about gadget in our blog this, please read it. and url link of this article is https://howtomonetizeeverything.blogspot.com/2013/12/simulation-of-quadrature-mirror-filter.html Hopefully discussion articles on provide more knowledge about the world of tech gadgets.

Tag :

Tweet