Difference between revisions of "Lectures"

Revision as of 06:32, 15 June 2009 (view source)

Huffmalm (Talk | contribs)

← Older edit

Revision as of 06:43, 15 June 2009 (view source)

Huffmalm (Talk | contribs)

(Replacing page with 'Lecture 1')

Newer edit →

Line 1:

−

~~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:~~

+

[[Lecture 1]]

−

+

−

~~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);~~

+

Difference between revisions of "Lectures" - Rhea

Revision as of 06:43, 15 June 2009

Alumni Liaison

@@ Line 1: / Line 1: @@
-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:
+[[Lecture 1]]
-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
-/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
-/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);