sinusoid with amplitude , frequency, samples, and sampling frequency?

how can i generate a sinusoid with amplitude 0.1 , frequency 100 Hz, with 100,000 samples, and sampling frequency 22,050 HZ? Please can anyone help me? thank you

Answer 1

[Image Analyst]

Did you try this?

amplitude = 0.1;
frequency = 100 % Hz
numSamples = 100000 % samples
samplingFrequency = 22050 % Hz (per second)
numSeconds = numSamples / samplingFrequency
x = linspace(0, numSeconds, numSamples);
y = amplitude * sin(2 * pi * x * frequency);
plot(x, y, 'b-', 'LineWidth', 2);
grid on;
xlabel('X', 'FontSize', 15);
ylabel('Y', 'FontSize', 15);

[john khnayzir]

thank you very much, but when i save the signal in a .wav file , i do not have any tone.

[john khnayzir]

wavwrite(y',"script.wav")

[Image Analyst]

I hear something. Add this to the end of your code and turn up your speakers:

soundsc(y, samplingFrequency);

Also see attached demo on making a wav file.

[john khnayzir]

thank you very much, it is working. and how can i plot the spectrum of the signal? the signal is on the file.

[Image Analyst]

Call fft() or pwelch() followed by plot(), or call spectrogram().