Professional Interests: Signal Processing

Question

Plotting only highest peaks from multiple signals

Hi, I need to extract only the peaks of three signals so I have one plot without changing the amplitude of the individual plots...

1 year ago | 3 answers | 0

Question

Moving Average using a for loop

Hi, How can I compute the moving average using a for loop and without using convolution (i.e conv()) or the filter function (i....

7 years ago | 1 answer | 0

Answered

which wavelet transform for image compreesion yields better compression and better PSNR value?

Try complex Morlet Wavelet see http://www.bth.se/fou/cuppsats.nsf/all/315e9a86357c82d8c1257b0b002cc52e/$file/BTH%202013%20Ibe...

which wavelet transform for image compreesion yields better compression and better PSNR value?

Try complex Morlet Wavelet see http://www.bth.se/fou/cuppsats.nsf/all/315e9a86357c82d8c1257b0b002cc52e/$file/BTH%202013%20Ibe...

7 years ago | 0

Answered

I need to find instantaneous frequency with phase of continuous wavelet transform using complex morlet wavelet as mother wavelet i.e( ridge-plot ) and also with the help of maximum modulus of CWT

Convert scale to frequency by: frequency= 1/0.033.*scale see http://www.bth.se/fou/cuppsats.nsf/all/315e9a86357c82d8c1257...

I need to find instantaneous frequency with phase of continuous wavelet transform using complex morlet wavelet as mother wavelet i.e( ridge-plot ) and also with the help of maximum modulus of CWT

Convert scale to frequency by: frequency= 1/0.033.*scale see http://www.bth.se/fou/cuppsats.nsf/all/315e9a86357c82d8c1257...

7 years ago | 0

Answered

How to plot time vs frequency in a wavelet transform?

Convert scale to frequency by frequency= 1/0.033*scale see http://www.bth.se/fou/cuppsats.nsf/all/315e9a86357c82d8c1257...

How to plot time vs frequency in a wavelet transform?

Convert scale to frequency by frequency= 1/0.033*scale see http://www.bth.se/fou/cuppsats.nsf/all/315e9a86357c82d8c1257...

7 years ago | 0

Answered

Wavelet Transforms using mother wavelets

I recommend you read the master thesis on the link. http://www.bth.se/fou/cuppsats.nsf/all/315e9a86357c82d8c1257b0b002cc52e/$...

Wavelet Transforms using mother wavelets

I recommend you read the master thesis on the link. http://www.bth.se/fou/cuppsats.nsf/all/315e9a86357c82d8c1257b0b002cc52e/$...

7 years ago | 0

Answered

Is it possible to implement continous complex morlet wavelet transform practically ?

You could write your own wavelet script and implement it without using the matlab toolbox. see http://www.bth.se/fou/cuppsats...

Is it possible to implement continous complex morlet wavelet transform practically ?

You could write your own wavelet script and implement it without using the matlab toolbox. see http://www.bth.se/fou/cuppsats...

7 years ago | 0

Answered

wavelet transform

I think it is best to write your own script see master thesis report could help http://www.bth.se/fou/cuppsats.nsf/all/315e9...

wavelet transform

I think it is best to write your own script see master thesis report could help http://www.bth.se/fou/cuppsats.nsf/all/315e9...

7 years ago | 0

Answered

two data in one plot graph

Sara is correct, you could also use plot(x,y1,'r') hold on plot(x,y2,'b')

two data in one plot graph

Sara is correct, you could also use plot(x,y1,'r') hold on plot(x,y2,'b')

7 years ago | 0

Answered

How do I perform envelop on a time signal

see http://www.mathworks.se/matlabcentral/answers/47237-how-to-create-an-envelop-from-three-graphs x = 1:100; y1...

How do I perform envelop on a time signal

see http://www.mathworks.se/matlabcentral/answers/47237-how-to-create-an-envelop-from-three-graphs x = 1:100; y1...

7 years ago | 0

Answered

The difference between the amplitudes of Fourier transform and wavelet transform

It depends on the window function used.

The difference between the amplitudes of Fourier transform and wavelet transform

It depends on the window function used.

7 years ago | 0

Answered

How do I compute the mean square value of a function

mean square value=mean(y.^2)

How do I compute the mean square value of a function

mean square value=mean(y.^2)

7 years ago | 0

Question

How can i Resample?

I have two signals measured with different sampling frequencies Signal 1 has a sampling frequency of 999.9917Hz while Signa...

7 years ago | 2 answers | 0

Question

How to compute the Sampling frequency from Time Stamps

Hi, I have the time stamps of a given signal xn, how can i compute the sampling frequency of this signal, it was not given?

7 years ago | 1 answer | 0

Question

What is the purpose of Resampling if it doesn't change the original bandwith of the signal?

What is the purpose of Resampling if it doesn't change the original bandwith of the signal? I have a low sampled analog signal, ...

8 years ago | 1 answer | 0

Question

how noverlap be estimated for 75% percent overlap

How can i estimate 75% overlap? nfft=512 overlap=0.75 noverlap=nfft*overlap is noverlap correct? I get error in my ...

8 years ago | 1 answer | 0

Question

making different signals equal in length

Hi, I am working with a set of data and i need all of them to be the same length. how can i do this?

8 years ago | 3 answers | 0

Answered

How to generate a signal with time varying frequency?

Use wavelet transform or Short time fourier transform. I prefer wavelet tranform for nonstationary signals

How to generate a signal with time varying frequency?

Use wavelet transform or Short time fourier transform. I prefer wavelet tranform for nonstationary signals

8 years ago | 0

Question

How can determine the sampling frequency from a time series data?

i need the sampling frequenccy of a give time series data. it is a 1x31225 time data if i choose any two point say x(:,1) and x...

8 years ago | 2 answers | 1

Answered

CSV vs MAT files

i have a csv file and want to convert it to a matlab file. how can i do this?

CSV vs MAT files

i have a csv file and want to convert it to a matlab file. how can i do this?

8 years ago | 0

Question

creating an input list from a large data set

Hi! I want to create an input list from a large data set. dir .*csv displays all the csv but when i do dir='C:\Lisajust...

8 years ago | 3 answers | 0

Question

saving a csv file as a .mat file

How can i save a csv file as a .mat file

8 years ago | 3 answers | 0

Answered

Import CSV file to 2012b make Windows 8 Entire UI hang!

you can try fopen, feof, fgets,regexprep,sscanf and fclose or fid=fopen(filename.csv') a = fread(fid,1,'uint32','l'); ...

Import CSV file to 2012b make Windows 8 Entire UI hang!

you can try fopen, feof, fgets,regexprep,sscanf and fclose or fid=fopen(filename.csv') a = fread(fid,1,'uint32','l'); ...

8 years ago | 0

Question

How can i read a csv file

How can i read a csv file. i used fopen but it gives a value of -1 A=fopen('slip.csv')

8 years ago | 2 answers | 0

Question

How to create an envelop from three graphs

How can i create an envelop for three different Signals. the edges around the three signals that are top most, so there is an en...

8 years ago | 1 answer | 0

Question

Marking the peak of a plot automatically without having to click on it

Hi, Is it possible to mark the peak of a plot automatically with a command without having to to mark on each plot.

8 years ago | 3 answers | 0

Question

how can i have three plots on one graph and save all three plots using one name

I have a loop with four files, how can i have three plots on one graph and save all three plots using each filename? so i get fo...

8 years ago | 1 answer | 0

Question

Area of a Spectrum

What matlab command can give me the area of a spectrum. I have shock response spectrum but i need to find the area under the cu...

8 years ago | 2 answers | 0

Answered

View a surface plot from the top

starting with a value lower than zero for the y-axis fixed it. axis([0 1000 -0.001 110 0 110]) view(0,90) With this...

View a surface plot from the top

starting with a value lower than zero for the y-axis fixed it. axis([0 1000 -0.001 110 0 110]) view(0,90) With this...

8 years ago | 3

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