1. Laptop Instrument
Meeting 7
February 7, 2018

2. The Note Chart Excel spreadsheet Columns for Helmholtz note name
ASA note name
ChucK note name
MIDI number
Frequency
Acoustical Society of America

3. From Before Program to play a note, specified by frequency
Program to play random notes
Program to play octaves
Program to play harmonic series
Programs doing arithmetic

4. Control Structures
Ways to control the order of execution of the statements.
while ( condition ) { statements }
if ( condition ) { statements }
else { statements }
for ( start ; condition ; increment ) { statements }
statements means
statement; statement; … statement;

5. Comparisons
freq < i <= 10 J >= 5 Foo == 23.0

6. While statement Action, or effect is
Check condition
If true, execute the statements enclosed in { }
Etc.
If the condition never becomes false, the loop never stops.
Ctrl C stops the program

7. For loop
for ( start ; condition ; increment ) { statements } start: Declare a “loop” variable and initialize it. 1 => int i; //Starts the loop at 1 increment: Calculate the new value of the loop variable 2 +=> i; //Increments by 2 condition: Test the loop variable to stop iterating i <= 25;

8. Exercise
Write a ChucK program that counts by threes starting at 5 and stopping just before Have the program print each of the count values.

9. Exercise
Write a ChucK program that prints the first 20 Fibonacci numbers. Let’s agree that f0 = 1 and f1 = 1. Then f2 = f0 + f1, f3 = f1 + f2, etc.

10. Exercise
Enhance your Fibonacci program to present the output in well-labeled form:
f0 = 1
f1 = 1
f2 = 2
f3 = 3
f4 = 5
etc

11. Exercise Modify your octave program so that it:
Uses the sine oscillator
Starts with a frequency of 27.5 Hz, the lowest note on the piano, an A
Plays in turn, each for one second, all the A’s on the piano from lowest to highest
Echoes to the screen the octave number and the frequency of the A.

12. Properties of a Note
Notes in ChucK