PRINT THIS PAGE OUT FOR REFERENCE! There are three parts to this project. Each part must be responded to independently by each student. However, you may work in teams and groups to solve the problems presented here. Dr. Thompson is available for assistance in the solution of these problems either by E-mail or by appointment. Due: During Finals Week, at our last class meeting. Be prepared to show your work, both in print form and in audio form. Bring your music examples on cassette or CD only. Please do not expect to compile your responses during the exam meeting. Bring a copy of all texts, orchestras, scores and responses for each member of the course. (9 copies total) Note that since this is a scientific endeavor your neatness and thoroughness is assumed and expected. All text responses must be typed.
1. Computer Synthesis Etude - Additive Synthesis
Using Csound, create an orchestra comprised of 3 different sounding instruments
of the following
dimensions:
Each instrument must be stereo.
Use additive synthesis only - use at least 6 OSCIL-type unit generators in each
instrument.
This instrument must have its own reverberator instrument associated with it.
The additive instrument must send a
global signal to the reverberator. Make sure that the balance between reverberated
and non-reverberated signals can be
controlled. Use the reverb example found online at the CARA web as a guide.
Using any compositional method you wish, create a 2 minute etude with this trio of csound instruments.
* Write a verbal synopsis of how the instruments function, outlining any parametric controls you have made available to the user. * Write a verbal synopsis of how you created the score for the instruments and the musical intention. * Create a 44.1KHz stereo realization of the score. * Save your instruments to floppy disk to turn in along with the score file, and printed documents as outlined above.
2. This instrument comes by way of a computer musician located at IRCAM in Paris. Provide a complete analysis of what this instrument does. Create a score file to demonstrate it and write a brief tutorial that another user could benefit from. Change all the comments in the score to English. Save the score and instrument to disk and also provide printed documentation. ;orchestra written by Martin Dupras ;fenetre dont la largeur varie rand entre 0 et 1 ;offset variable dans un range de 0 et 1 ;variation random de la grandeur agr*aof <= 1 ;gr min .05 ;variation de l'offset sr = 11025 kr = 441 ksmps = 25 nchnls = 1 instr 1 ;p4 rate de changement debut ;p5 rate de changement fin ;p6 grandeur depart ;p7 grandeur fin ;p8 offset depart ;p9 offset fin kcps line p4,p3,p5 ;kcps = rate de changement fen,off,env i2 = ftlen(2) ;i3 = ftlen(3) ain init .5 agr line p6,p3,p7 agr = abs(agr) amax = 1-agr aof line p8,p3,p9 aof = abs(aof) aof2 = amax*aof anv oscil 1,kcps,4 krt = sr/i2 aph phasor krt*agr ;index de lecture de la fenetre a1 table (aph*agr)+aof2,2,1,0,1 out a1*15000*anv endin
3. This instrument was written by an old friend - Dr. Eric Lyon - now a
instructor of computer music at a university in Japan. Explain what
it does - providing a flow-chart diagram (as in the above) and
create a score which demonstrates the instrument. Write a brief
tutorial that another user could benefit from. Save the score and
instrument to disk and provide printed documentation.
sr=44100
kr=50
ksmps=882
; implements pulse wave with varying duty cycle
; USE HIGHER K RATES FOR FASTER TRANSITION SPEEDS
; function 1 is sine
; function 2 is raised cosine
; freq amp speed minduty harmonic-stretchfactor
; NOTE USE OF LOW K-RATE
instr 1
ipi = 3.141593
istretch = p8
if1 = p4
if2 = if1*2.*istretch
if3 = if1*3.*istretch
if4 = if1*4.*istretch
if5 = if1*5.*istretch
if6 = if1*6.*istretch
if7 = if1*7.*istretch
if8 = if1*8.*istretch
inumharms = 8
igain = p5 * (32767./inumharms)
ia1 = igain
ia2 = ia1/2.
ia3 = ia1/3.
ia4 = ia1/4.
ia5 = ia1/5.
ia6 = ia1/6.
ia7 = ia1/7.
ia8 = ia1/8.
idutyspeed = p6
iminduty = p7
imaxduty = .9999
idutyamp = imaxduty-iminduty
; PARAMETERIZE ENVELOPE HERE IF DESIRED
iatk=.1
idk=.2
isust=p3-(iatk+idk)
kenv linseg 0,iatk,igain,isust,igain,idk,0
kduty oscil idutyamp, idutyspeed, 2
kduty = (kduty + iminduty)*idutyspeed
kamp1 = sin(kduty*ipi)
kamp2 = sin(2*kduty*ipi)
kamp3 = sin(3*kduty*ipi)
kamp4 = sin(4*kduty*ipi)
kamp5 = sin(5*kduty*ipi)
kamp6 = sin(6*kduty*ipi)
kamp7 = sin(7*kduty*ipi)
kamp8 = sin(8*kduty*ipi)
asig1 oscil kamp1,if1,1
asig2 oscil kamp2,if2,1
asig3 oscil kamp3,if3,1
asig4 oscil kamp4,if4,1
asig5 oscil kamp5,if5,1
asig6 oscil kamp6,if6,1
asig7 oscil kamp7,if7,1
asig8 oscil kamp8,if8,1
asum = asig1+asig2+asig3+asig4+asig5+asig6+asig7+asig8
out asum * kenv
endin
******************************************************************************
;SCORE FILE
f1 0 8192 10 1
f2 0 8192 -9 .5 1.0 0
; freq amp speed minpulse harmonic-stretchfactor
i1 0 2.7 83 .6 .3 .3 1.
i1 1.5 2.7 57.241 .6 .7 .23 1.01
i1 3 3.1 101.666 .6 .117 .23 1.1
i1 4 7 27.5 .6 1.8 1.1 1.05
e ;ric
Good Luck!