# How to create sounds with specific characteristics?

How can I create sounds with MATLAB with the following characteristics:

Sound 1:

`pitch: 3 sinusoidal partials of 500, 1000  and 1500 Hz duration: 100 ms (including 5 ms rise and fall times) amplitude: 80 dB`

Sound 2:

`like Sound 1, but with a cutting out of 10 ms (5 ms fall / rise included) from the middle of the sound`

This is my third try

`%%configure signal settings duration = 0.1;                % duration in seconds amplitude = 0.8;               % amplitude f1 = 500;                      % frequency in Hertz f2 = 1000; f3 = 1500; phi = 2*pi*0.5;                % phase offset, e.g.: 2*pi*0.25 = 1/4 cycle %%configure output settings fs = 44100;                    % sampling rate T = 1/fs;                      % sampling period t = 0:T:duration;              % time vector %%create the signal omega1 = 2*pi*f1;              % angular frequency in radians omega2 = 2*pi*f2; omega3 = 2*pi*f3; partial1 = cos(omega1*t + phi)*amplitude;      % sinusoidal partial 1 partial2 = cos(omega2*t + phi)*amplitude;      % sinusoidal partial 2 partial3 = cos(omega3*t + phi)*amplitude;      % sinusoidal partial 3 signal = (partial1 + partial2 + partial3)/3; %%plot the signal plot(t, signal); xlabel('Time (seconds)'); ylabel('Amplitude'); title('Complex Signal'); %%play the signal sound(signal, fs); %%save signal as stereo wave file stereo_signal = [x1; x1]'; wavwrite(stereo_signal, fs, 'test.wav');`

I am wondering how to adjust the amplitude and to implement the rise and fall.

NOTE:-

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A window can be anything going from zero to unity. In this case it should reach unity after 5ms from the start. You should know what kind of performance you are looking for, so you can determine what response your window should have.

Often I start with 1/4 of a sine period, since it has the nice properties to start with a ramp and that its derivative is continuous when it meets unity. For instance for time array t with begin time b and end time e of the window;

`w = ((1+sin(pi*(t-b)/2/e))/2.*(t>b-e)-1 ) .*(t<=b+e)+ 1;`

This equals 0 for t<b, then increases and equals 1 for t>e. Also note that Matlab

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## Technical Source

Simple! That is me, a simple person. I am passionate about knowledge and reading. That’s why I have decided to write and share a bit of my life and thoughts to.