MATLAB: Generating a 6 second sine wave

homeworksine wave seconds

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.

Best Answer

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

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Here's an example to get you started. 5 seconds of middle C.

fs = 1e4; % sampling frequency
t = 1:1/fs:5; % time signal
freq = 261.6; % note frequency in Hz (middle C)
y = sin(2*pi*freq*t); % create sine wave
player = audioplayer(y, fs); % create audio player object
play(player); % play the sound

MATLAB: How to save two sin waves with left and right channels in a stereo wav file

To create a stereophonic sound file, you need to create a (Nx2) matrix, so each channel is a column vector. In this example, ‘x’ will be the left channel, and ‘y’ will be the right channel.

The Code —

fs = 8000; %frequency sample rate
i=1/fs; % interval
t = 0:i:2; % time
phi = 0;
A = 1;
% F = 220Hz
f = 220;
x = A*sin((2*pi*f*t) + phi);
% F = 240Hz
f = 240;
y = A*sin((2*pi*f*t) + phi);
stereo_mtx = [x(:), y(:)];
audiowrite('stereo sound.wav', stereo_mtx, fs);

Best Answer

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