(New page: Here is a Matlab script reflecting Lecture 1. The script plays various audio signals. Copy and paste the script into an m-file and play: load handel; %Loads 2 variables, y and Fs. y is ...) |
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| − | Here is a Matlab script reflecting Lecture 1. The script plays various audio signals. Copy and paste the script into an m-file and play: | + | [[Category:ECE301]] [[Category:Programming]] [[Category:Matlab]] [[Category:lecture notes]] |
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| + | =Lecture 1, [[ECE301]], Summer 2009, Landis Huffman= | ||
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| + | '''Here is a Matlab script reflecting Lecture 1. The script plays various audio signals. Copy and paste the script into an m-file and play:''' | ||
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load handel; %Loads 2 variables, y and Fs. y is a signal containing | load handel; %Loads 2 variables, y and Fs. y is a signal containing | ||
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sound(x,1/delta); | sound(x,1/delta); | ||
| + | ---- | ||
| + | [[ECE301_%28HuffmalmSummer2009%29|Back to ECE301, Summer 2011, Landis Huffman]] | ||
Latest revision as of 04:30, 11 July 2012
Lecture 1, ECE301, Summer 2009, Landis Huffman
Here is a Matlab script reflecting Lecture 1. The script plays various audio signals. Copy and paste the script into an m-file and play:
load handel; %Loads 2 variables, y and Fs. y is a signal containing
information: a vector of numbers representing an audio clip. Fs is the
sampling frequency.
sound(y,Fs); %play the audio file at the appropriate sampling frequency.
input('Press enter to hear the same audio with 1/4 the samples')
downsample = 4; %factor to decrease sampling rate by sound(y(1:downsample:end)*downsample,Fs/downsample); %Plays the same signal with only 1/4 of the original "information." Note the degradation in quality
input('Press enter to hear the same audio with 1/100 of the original samples')
downsample = 100; %factor to decrease sampling rate by sound(y(1:downsample:end)*downsample,Fs/downsample); %Plays the same signal with only 1/100 of the original "information." Original audio is nearly unrecognizable.
input('Press enter to hear a constant tone note A')
delta = 0.00005; %Sampling period t = 1:delta:3; %a vector representing 3 seconds of time x = sin(2*pi*440*t); %a vector representing the sinusoid tone A
sound(x,1/delta);
input('Press enter to hear a tone note A an octave higher') x = sin(2*pi*880*t); %a vector representing the sinusoid tone A an octave higher
sound(x,1/delta);
