Assignment 1, now due Tuesday, April 22, is to extract the vocal part from this soundfile.

See the patches in this directory to find the tools you need to do it:

• 11.chart-recorder.pd: record a pitch track, measured using the fiddle~ object (the pitch tracker), and stored into an array for later use;
• 07.whammy-bar.pd - how to make a comb filter using FFTs. The "comb" shape is really a pulse train, which has to be phase-locked to the FFTs. The 'time period' between pulses becomes the center frequency of the comb filter; the 'pulse width' becomes the bandwidth of each tooth of the comb.

To do the homework:

• Download the soundfile and make a sample reader (tabplay~ will do fine).
• Modify "07.whammy-bar.pd" to filter the sound sample.
• Make a pitch track of the soundfile. You'll have to edit this by hand to get even reasonable results. The pitches vary, roughly, between 60 and 70 in MIDI units.
• Make a sequencer that feeds the pitch track into the "whammy bar". Alternatively you can try rebuilding the table in the patch by scaling the peak locations. The sequencer should start the soundfile playback automatically so that the two are in sync.
• Listening to the output, go back and tune the pitch track to agree as well as possible with the soundfile. There's no one best way to do this; careful listening and careful thought will help.