Hernandez, Arvel
Music 220a
Homework #2

Length of copper pipe = 17.25 in.
 
First Impulse = 0.007 sec.
First echo of impulse = 0.010 sec.

Time interval between impulses = 0.010 sec. - 0.007 sec. = 0.003 sec.

Speed of sound = (17.25 in. * 2) / 0.003 sec. = 11500.00 in/sec = 958.33 ft/sec

Actual speed of sound = 1128 ft/sec

Deviation = 170 ft/sec

% error = 15.07 %

Metric Speed of Sound = 292.10 m/sec.


 
 

The amplitudes of the first five peaks of this recording are:
peak  1: 0.585
peak  2: 0.296
peak  3: 0.167
peak  4: 0.095
peak  5: 0.065

The attenuations between these amplitudes respectively are:
0.505
0.564
0.568
0.684

The average attenuation was: 0.580

The numbers in bold are the changes made to the code.  0.003 is the new frequency and 0.580 is the
new attenuation.
(map-chan (echo .003 .580))

The full code can be viewed at:  IIR Code

The resulting wave forms are: