hi friends, i am doing my project on transmultiplexers.i want to do it in simulink.i am trying to create blocks for each one like decimator,interpolator............. but i always get an error .the following is the interpolation program.can anyone tell me how to create a block for this in simulink clf; dt=0.00005; t=-0:dt:N-1; N=input('input length:'); L=input('up-sampling factor:'); f0=input('input signal frequency:'); t=0:50; n=0:N-1; xa=sin(2*pi*f0*t); x=sin(2*pi*f0*n); y=zeros(1,L*length(x)); y([1:L:length(y)])=x; subplot(2,1,1); plot(t,xa); hold on stem(n,x); title('input sequence'); xlabel('time index n'); ylabel('amplitude'); subplot(2,1,2); stem(n,y(1:length(x))); title(['output sequence up-sampled by',num2str(L)]); xlabel('time index n'); ylabel('amplitude'); thank you.

# creating user defined blocks

**From:**m...@yahoogroups.com [mailto:m...@yahoogroups.com]

**On Behalf Of**krishna_31985

**Sent:**Tuesday, February 14, 2006 8:18 PM

**To:**m...@yahoogroups.com

**Subject:**[matlab] creating user defined blocks

`hi friends,`

i am doing my project on transmultiplexers.i want to do it in

simulink.i am trying to create blocks for each one like

decimator,interpolator.............

but i always get an error .the following is the

interpolation program.can anyone tell me how to create a block for

this in simulink

clf;

dt=0.00005;

t=-0:dt:N-1;

N=input('input length:');

L=input('up-sampling factor:');

f0=input('input signal frequency:');

t=0:50;

n=0:N-1;

xa=sin(2*pi*f0*t);

x=sin(2*pi*f0*n);

y=zeros(1,L*length(x));

y([1:L:length(y)])=x;

subplot(2,1,1);

plot(t,xa);

hold on

stem(n,x);

title('input sequence');

xlabel('time index n');

ylabel('amplitude');

subplot(2,1,2);

stem(n,y(1:length(x)));

title(['output sequence up-sampled by',num2str(L)]);

xlabel('time index n');

ylabel('amplitude');

thank you.

i am doing my project on transmultiplexers.i want to do it in

simulink.i am trying to create blocks for each one like

decimator,interpolator.............

but i always get an error .the following is the

interpolation program.can anyone tell me how to create a block for

this in simulink

clf;

dt=0.00005;

t=-0:dt:N-1;

N=input('input length:');

L=input('up-sampling factor:');

f0=input('input signal frequency:');

t=0:50;

n=0:N-1;

xa=sin(2*pi*f0*t);

x=sin(2*pi*f0*n);

y=zeros(1,L*length(x));

y([1:L:length(y)])=x;

subplot(2,1,1);

plot(t,xa);

hold on

stem(n,x);

title('input sequence');

xlabel('time index n');

ylabel('amplitude');

subplot(2,1,2);

stem(n,y(1:length(x)));

title(['output sequence up-sampled by',num2str(L)]);

xlabel('time index n');

ylabel('amplitude');

thank you.

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`Krishna-`

`> Not sure what you really want,
but this appears to just insert`
`> zero samples to up-sample
the input. Simulink's DSP Blockset`
`> has the Upsample block in
the Signal Operations section of the`
`> DSP Blockset library, which
would do the same, I think.``
`

`If increased sampling rate is
actually the desired result, don't forget to apply anti-aliasing filter
after inserting zeros. The filter should be LPF with cut-off at 1/2
original sampling rate. Otherwise the 'edges' between samples and
zeros contain frequencies higher than that.``
`

`-Jeff`
`
`

From:m...@yahoogroups.com [mailto:m...@yahoogroups.com]On Behalf Ofkrishna_31985Sent:Tuesday, February 14, 2006 8:18 PMTo:m...@yahoogroups.comSubject:[matlab] creating user defined blockshi friends,i am doing my project on transmultiplexers.i want to do it insimulink.i am trying to create blocks for each one likedecimator,interpolator.............but i always get an error .the following is theinterpolation program.can anyone tell me how to create a block forthis in simulinkclf;dt=0.00005;t=-0:dt:N-1;N=input('input length:');L=input('up-sampling factor:');f0=input('input signal frequency:');t=0:50;n=0:N-1;xa=sin(2*pi*f0*t);x=sin(2*pi*f0*n);y=zeros(1,L*length(x));y([1:L:length(y)])=x;subplot(2,1,1);plot(t,xa);hold onstem(n,x);title('input sequence');xlabel('time index n');ylabel('amplitude');subplot(2,1,2);stem(n,y(1:length(x)));title(['output sequence up-sampled by',num2str(L)]);xlabel('time index n');ylabel('amplitude');thank you.