Machine Problem 2: STFT

In MP2, you will automatically transcribe and synthesize music using the STFT.

• Code, test code, data, and solutions.
• Reading: DSP First, pp. 240-255
• Reading: Measurement of pitch in speech: An implementation of Goldstein’s theory of pitch perception, Duifhuis and Willems, page 1574
• The violin samples that are being analyzed in this lab are drawn from the University of Iowa Musical Instrument Samples.

The ZIP Archive, and the recommended Code-Writing Process

In the ZIP archive, you will find the following directory hierarchy:

• mp2.py -- this is the ONLY file that you will submit, and the only file on which you will be graded.
  • The parts that you need to edit are marked with NotImplementedError, so you can find them easily.
  • If you run this from the command line: python mp2.py, it will generate a popup window (using tkinter) with a debugging visualization, in between each pair of steps.
  • If you run this from the command line: python mp2.py --showsolutions, it will show you the solutions.
  • If you get tired of all the popup windows, you can have it go directly to the step you want by typing python mp2.py -s N where N is any integer from 0 to 8.
• solutions.hdf5 -- this is just what it says; complete solutions for the visible data (not for the hidden data, though). You can read this file using H5PY (see the code provided in mp2.py for examples).
• run_tests.py -- the autograder will actually run python run_tests.py -j, which gives JSON output. During debugging, I recommend using just python run_tests.py, which gives plaintext output -- a little more human-readable. The tests are specified in tests/test_visible.py.

How to Submit

• Go to Gradescope. Under "Active Assignments," click "MP2". Submit mp2.py as a plain text file. There are other submission options (e.g., you can submit through github; you can submit a zip file), but just choosing mp2.py to upload is easiest. If you upload a zip archive, everything else in the archive you submit will be ignored.
• You may submit as many times as you like. Your total score (for both visible and hidden data) will be shown. If you get 100%, you're done.
• In general, we will only see the grade of your most recent gradescope submission. We are willing to use your highest gradescope grade, but you have to tell us which one it is.