Normalising and rescaling my ultrasonic signal

I am exciting ultrasound in wateter which then gooes through the material. I want to notrmalise my signal in such a way that it is scaled by having my input signal and the front wall of my material the same amplitude say, an amplitude of 1. Below is an image of what I have just now. I am not what steps I would need to take to scale this signal. I have been told it is a standard thing that can be achieved in Matlab

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I will post extra information and what I have. Both my Time and Data are of the size (8600 x 1 ). Any ideas how I can go abot normalising/scaling this would be greatly appreciated. Dave :)

%Load in files

FName = 'Tit_10MHz_110F.flxhst';
MyData = read_history(FName);

% Load in Data and Time signals from each file
Time = MyData.TimeRecB.Time;
Data= MyData.DataRecB(1).Data;


figure(01)
 plot(Time,Data)
 xlabel('Time(s)')
 xlim([0 7e-6])
 ylabel('Amplitude')
 title('10 MHz 110 Features')

Answer 1

[Star Strider]

There are (at least) two functions that can do what you want, one being rescale and the other being normalize.

Experiment to see which of them works best in your code.

[David Harra]

Using the rescale option I can get the amplitude of the input signal to 1m but I am not sure how to scale this in such a way the first 2 signals are equal. Thanks for putting me on the correct path. I will keep trying :)

[Star Strider]

My pleasure!

I doubt that it would be possible to use any specific function to have the amplitudes of both signals made equal. That is simply the physics of the experiment. If the objective is to time them or to do some other sort of signal processing on them, having them have equal amplitudes may not be necessary.

What do you want to do with those data?

[David Harra]

Inbetween the input signal and the front wall signal is when the wave is travelling through water, an area where the signals arent of any interest. I was told it was standard to scale these to signals to have the amplitudes the same. My goal is to develop a relationship between the attenuated amplitude signal and the sigal noise when my ultrasound is traveling through titanium.

[Star Strider]

I’m not certain how to scale them so that they both have the same amplitudes, and I am not certain what aspects of the signal are important to retain. That it is standard to scale them so that they have the same amplitudes leads me to believe that such a process exists and is recognised in the literature. It would be helpful for me to know what that process is, since this is the first time I have ever encountered that sort of requriement.

[David Harra]

This could well be me interpretating this incorrectly. If not, I thought it would be possible to select specific peaks and assign them an amplitude. Or if I removed all the data before the first wall and rescaled it so the first wall signal is 1 and the rest of the data is rescaled accordingly.

Thanks though for your input it has gave me more to think about and learn. It's appreciated 😀

[Star Strider]

As always, my pleasure!