Risks

Right now the most significant risks that could jeopardize our project are the EGG being broken since right now we can get an EGG signal but we cannot measure anything with the electrode and the EGG reads 0 signal when we try to measure with the electrode sensor. To mitigate this, Tyler has emailed both Professor Helou and Professor Brancaccio to go over the EGG setup and troubleshooting methodology. If we can pinpoint the problem, it could be possible to either repair or replace the sensor. Another risk is measuring the EGG data into a nice spreadsheet since VoceVista doesn’t instantly do it, but worst case scenario we can manually fix the spreadsheets since VoceVista allows you to transcribe the EGG data into the spreadsheet for short time periods.

No changes have been made to the existing design.

Pitch Analysis

Our pitch analysis algorithm has been implemented, but modifications are expected to be made (for the sake of accuracy) once we begin formally testing next week.

Currently, the algorithm starts by importing and processing an Excel sheet exported from Voce Vista. By using the openxl library, the program to extract the times and frequencies into separate lists. These lists are then processed to extract an average frequency value across 38 cells, which translates to roughly 0.5 seconds. Next, the program makes use of an interval tree (from the intervaltree library) to map each averaged frequency to a pitch note, saved in a list of pitches.

In an attempt to account for frequency averages that misleadingly represent the transition between one note to the next note, we strategically took a second list of averaged frequencies starting from a time slightly ahead of the first frequency list, which then is used to give us a second list of pitches. We build a final list of resulting pitches by comparing each value of the first pitch list against the second pitch list. If the value at index i in the first list does not match the value at index i or i-1 in the second list, then we use the value in the second list. Otherwise, we use the value in the first list. Below we visually represent this attempt to account for averages of transitioning notes.

Finally, the program returns a list of times and pitches.

A “None” time or “Undefined” pitch just indicates the last averaged 38 cells included data from empty Excel cells. Since this represents only the last ~0.5 seconds of the audio recording, we are willing to forgo this data as indicated above.