Assignment 5, due Thursday, April 17, 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).
• Working from 07.whammy-bar.pd, filter the sound for sweepable pitches.
• 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 frequency input of the comb filter. 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.