Generating a 6 second sine wave?

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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.

Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 7 Oct 2014
f=400
Amp=1
ts=1/8000;
T=6
t=0:ts:T;
y=sin(2*pi*f*t);
plot(t,y)
  3 Comments
Image Analyst
Image Analyst on 26 Mar 2018
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
Mohamad on 4 Apr 2019
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)

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More Answers (1)

Image Analyst
Image Analyst on 7 Oct 2014
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.
  3 Comments
Dick Rusell
Dick Rusell on 10 Oct 2014
Is there a way to zoom outt? Because I get a blue box when I plot it from the frequency.
Akpabio Ekpewoh
Akpabio Ekpewoh on 11 Jul 2019
Yes, just use the icons on the top of the plot

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