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===Answer 1=== | ===Answer 1=== | ||
| − | + | The signal we want is <math>x(t) = cos(440 * 2\pi)</math>. | |
| + | |||
| + | We can first create a vector of sample times. In this case, we'll let the sample frequency be 1320 Hz over a sample interval of [0,1] | ||
| + | |||
| + | t = 0:(1/1320):1; | ||
| + | |||
| + | Next, we can generate the sound samples vector from the sample times vector. | ||
| + | |||
| + | y = cos(440*2*pi*t); | ||
| + | |||
| + | Finally, we play the signal by using the "sound" command, which needs the user to specify the sound vector and the sample rate of that vector. Our sample was 1320. | ||
| + | |||
| + | sound(y, 1320); | ||
| + | |||
| + | The sample frequency was chosen so that it was more than twice the note frequency, so that the signal could be completely recovered from this sample. | ||
===Answer 2=== | ===Answer 2=== | ||
Write it here. | Write it here. | ||
Revision as of 19:45, 3 September 2011
Contents
Sampling of an A 440
Explain how one can use MATLAB to play an A 440. Discuss your choice of sampling rate. (Feel free to post a sound file of your output.)
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Answer 1
The signal we want is $ x(t) = cos(440 * 2\pi) $.
We can first create a vector of sample times. In this case, we'll let the sample frequency be 1320 Hz over a sample interval of [0,1]
t = 0:(1/1320):1;
Next, we can generate the sound samples vector from the sample times vector.
y = cos(440*2*pi*t);
Finally, we play the signal by using the "sound" command, which needs the user to specify the sound vector and the sample rate of that vector. Our sample was 1320.
sound(y, 1320);
The sample frequency was chosen so that it was more than twice the note frequency, so that the signal could be completely recovered from this sample.
Answer 2
Write it here.
Answer 3
write it here.
