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=====   COMP2720   =====   Semester 2, 2006   =====   Lab sheet  =====
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Student name: Dean Dal Broi
Student Uni ID: u4222206
Lab goup: Tue 10-12
Tutor: Peter Christen
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Lab number: 4
Date: 20/9/06
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Completed lab pre-liminaries. Ready to move onto part 1.

Part 1.

Q2.
s1 does sound double as loud as s2 as it has double the amplitude. 
After also playing around with different values for the frequency and 
amplitude i found that as the frequency value increases the sound 
becomes higher pitched and as the value decreases it becomes lower 
pitched. If the amplitude value is increased the sound becomes louder 
and if it is decreased the sound becomes softer.

Q3.
the pitch of s2 is double the pitch of s1 as expected.

Q4.
These two sounds are of course different. s1 has curved flowing sound 
waves where as s2 has rectangular ridged sound waves. however I'm 
surprised that s2 doesnt sound more different to s1 than it already 
does.

Q5.
s1 sounds a lot softer than s2 which is comparable to the sound of a 
fire alarm. s3 sounds similar to s1 but with a different tone.

Q6.
created the sawtoothWave function by modifying the triangleWave function 
so that it didnt reverse the amplitude at the end of every half-cycle and 
instead set the sampleValue to the the max value after it had reached the 
minimum value after a full cycle. 

the main loop was modified from this:

  for pos in range(1,getLength(mySound)+1): 
    # if end of a half-cycle
    if (i > samplesPerHalfCycle):
      # Reverse the amplitude
      increment = increment * -1
      # And reinitialise the half-cycle counter
      i = 0
    sampleVal = sampleVal + increment
    setSampleValueAt(mySound, pos, sampleVal)

    i = i + 1

to this:

  for pos in range(1,getLength(mySound)+1): 
    sampleVal = sampleVal - decrement 
    setSampleValueAt(mySound, pos, sampleVal)
    #if the sample has reach the bottom of the sound wave 
    if sampleVal == -amplitude:
      #set the new sample to be at the top of the wave
      sampleVal = amplitude + decrement  

Q7.
Had to modify the addSounds function in order for it to work correctly
by changing the new sound value to be the addition of the 2 samples
divided by 2. I Then created 3 sounds from sounds made from the other 
functions being added together using addSounds

Part 2.

Q2.
Have run the command "playMIDI('testsong.csv', 'MIDInotes.csv')" and 
the little tune that plays sounds nice!

Q3.
the function song() plays the same song as 
"playMIDI('testsong.csv', 'MIDInotes.csv')" the major difference it 
that the second function plays the song from a file and and the first 
plays the song directly from code within the function.

Q4.
Composed by beautiful random sounding little csv tune.

Q5.
the benefit of the playMIDI function over song is that it is flexible 
in the sense that the function doesnt need to be re-coded to play 
another song. However it also makes the process of playing a song 
actually longer than song.


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