Generating a 6 second sine wave?

I'm supposed to generate a 6 seconds long sine wave that has amplitude of 1.0, frequency of 400Hz at a 8KHz sampling frequency, but I'm not sure how to control how long the wave lasts for.

Answer 1

[Azzi Abdelmalek]

f=400
Amp=1
ts=1/8000;
T=6
t=0:ts:T;
y=sin(2*pi*f*t);
plot(t,y)

[Kay Wonderley]

Hi I have done this (below).

How do I turn it into a function?

f=100;
Amp=10;
fs = 44100;
ts=1/44100;
T=10;
t=0:ts:T;
y=sin(2*pi*f*t);
sound(y,fs)

[Image Analyst]

Add a function line:

function [t, y] = PlaySound()
f=100;
Amp=10;
fs = 44100;
ts=1/44100;
T=10;
t=0:ts:T;
y=sin(2*pi*f*t);
sound(y,fs)

[Mohamad]

f=400

Amp=1

ts=1/8000;

T=6

t=0:ts:T-ts; % I modified this line to make signal duration 6 seconds

y=sin(2*pi*f*t);

plot(t,y)

Answer 2

[Image Analyst]

Hint: 6 seconds at 8000 times per second means that the vector (row array) will be 48000 elements long.

sineWave = sin(2*pi*freq*timeVector);

See if that's enough hints.

[Image Analyst]

Well it looks like Azzi did it all for you. Though if you ever want to change the amplitude you should use

y = Amp * sin(2*pi*f*t);

[Dick Rusell]

Is there a way to zoom outt? Because I get a blue box when I plot it from the frequency.

[Akpabio Ekpewoh]

Yes, just use the icons on the top of the plot