How do i get the sound of a cosine signal

I am trying to get the sound of a signal with different phases where its frequency is a frequency of a musical note. f=493.88. My code is below.

t=[0:0.2:20];

xc1=cos(2*pi*493.88*t);

xc12=cos(2*pi*493.88*t+pi/4);

xc13=cos(2*pi*493.88*t+pi/2);

xc14=cos(2*pi*493.88*t+pi);

soundsc(xc1, 1000)

When i try to run the sound i just get a tapping sound for 1 milisecond and then it stops. How do get the sound of the signal? Thank you in advance.

Answer 1

[Scott MacKenzie]

You've only got 100 sample points and the sampling rate is too low. Try this...

t=[0:0.2:2000];
xc1=cos(2*pi*493.88*t);
soundsc(xc1, 8000)

[Deniz Bozdogan]

Thank you

[Deniz Bozdogan]

This was my question:

1. assume that, for this value of f , you would like to listen to this note 20 sec- onds. First generate t array such that it starts from 0 sec. and it includes 100 sample points at each period for the chosen value of ω. That is, you will write the commandt = [0 : ∆t : 20];, where ∆t is computed such that at each period of the cosine signal, you will have 100 sample points.

then i modified it as:

t=[0:0.00002:20];

xc1=cos(2*pi*493.88*t);

xc12=cos(2*pi*493.88*t+pi/4);

xc13=cos(2*pi*493.88*t+pi/2);

xc14=cos(2*pi*493.88*t+pi);

soundsc(xc14,50000)

the sound would be the same for all signals right?

[Scott MacKenzie]

I'm not sure what you mean by "the sound would be the same for all signals right?". If the signals you are referring to are xc1, xc12, xc13, and xc14, then yes, the sound will be the same. The waveforms in these vectors are identical except you've added a bit of a phase shift (e.g., "+pi/2"). The phase shift does not affect the sound.

[Deniz Bozdogan]

That's what i was asking for thank you.

Answer 2

[Image Analyst]

Scott is right on.

For what it's worth, I'm attaching my demo for making a warbling, decaying chirp sound: