Homework 4 should be a quick study to work with some remaining essentials. Its components might help you imagine related mini-project possibilities.

Set up a microphone for real-time input to chuck. This can be the one you built earlier or whatever is convenient to plug into the soundcard you're using.

Test each of the examples listed in this collection using miniAudicle. They introduce several new concepts in turn:

• adc input
• UGen's for effects processing
  resonator, pitch shifter
• custom pattern generating functions
  chaos, periodic, random
• real-time control mechanisms
  computer keyboard
• FFT-based tracking
  spectral centroid, RMS amplitude

Specifically, the files and concepts in the collection include:

• inOut.ck
  hook a mic to speaker through chuck
  (see also basic/adc.ck)
• inEfx.ck
  resonance filter affecting mic signal with slow, rectified sine pattern changing the resonance
  (see also filter/resonz.ck)
• chaotic.ck / plotChaotic.ck
  print or plot values from the logistic map chaotic function
  in the second file, its plot data goes to a "hardwired" filename, change as needed
  the program examples run independent of time

  x is chaos state
  r is chaos "heat"

• plotPeriodic.ck
  plot low frequency periodic signal
  example depends on time

  f is wave frequency
  a is wave amplitude

• plotRandom.ck
  plot a random walk
  the example runs independent of time

  l is low bound
  h is hi bound

• FFT.ck
  mic or instrument input through trackers from analysis/centroid.ck and analysis/rms
  SinOsc sonifies tracker outputs

  c is instantaneous centroid of input signal
  r is RMS amplitude of input signal

  (see also analysis/fft.ck)
  (see also analysis/features/centroid.ck)
  (see also analysis/features/rms.ck)
• combineEfxRandom.ck
  mic or instrument input through pitch shifter with random variation
  PitShift effect, Random class from above
  (see also book/digital-artists/chapter6/Listing6.14.ck)
• combineClarinetChaotic.ck
  combine clarinet physical model with chaotic variation
  Clarinet UGen, Logistic class from above
• kbdControlChaotic.ck
  combine computer keyboard control with clarinet and chaotic variation
  Hid Class, Clarinet UGen, Logistic class
  (see also hid/kb.ck)

Homework 4's assignment is to use adc input in combination with effects processing and pattern generation.

Those are the essentials, but don't consider the assignment to be limited only to them. Feel free to (optionally) incorporate real-time control and/or FFT-based tracking. Also, any aspect of earlier assignment work. More effects, control mechanisms, and FFT-based analysis and tracking are available in example code directories which come with chuck and miniAudicle.

The three final examples above are example "combinations." Like with HW3, don't just recycle the examples provided. Customize and if you have time, layer multiple musical "voices" so there's more than one thing going on simultaneously. That can either be done in the same chuck script or by post-processing e.g., layering .wav files using audacity or merging them with sox.

Record a demo "performance" on some original code using the components specified above. Turn in a recorded (stereo) .wav file and your final chuck code. (Record with audacity or write it real time with WvOut2 -- in which case don't forget to close the output file appropriately.) As before, an explanatory web page (hw4.html) should land in the expected place (Library/Web/220a/) which includes links to the .wav and .ck files (living in a parallel hw4/ subdirectory).