The purpose of this script is just to make sure that audio can be output from the speakers when you hit a key on the MIDI controller. Note that this script will only play one note at a time, and no matter where you press on the keyboard, the same pitch will be played. I also make use of the intensity of the keypress here to manipulate how loud the output audio should be. The difficult component with this script is getting the keypress that we detected in the last two scripts to trigger an impulse (and output audio). This generates output values that correspond to an output audio signal, and I use PyAudio to send these output values to the speakers. With this second-order difference equation, I trigger an impulse response in the input that will be sent into linear / time-invariant (LTI) system described by the second-order difference equation.
ALESIS Q49 WONT PLAY CODE
This audio code comes directly from the EE4163 course that this project was completed as part of. In order to generate audio, I'm using a second-order difference equation with set parameters for decay time, amplitude, pitch, etc. This script is a bit more complicated, since I'm outputting sound for the first time. This script is really just a sanity check that I can pull out the specific information I need. Once I get a keydown/keyup event, I also want to know what key I pressed, and with what intensity. I only need to get keydown and keyup events, so I only check for those events in this script. Now that I know my MIDI controller can be detected, and I know what sorts of events I want to detect, it's time to actually sort out just the information I need for my project. Identify the MIDI events that your device triggersĪfter running this script, I populated the AlesisQ49MIDIvalues.txt text file with empirical information about the MIDI events that I found were specific to my Alesis Q49.Identify which MIDI device you want to take input from (it may not necessarily be the default).Identify that your MIDI device is successfully connected and detected by your computer.If you wish to modify the main script by using your own MIDI controller, this script will be important for you to: This script then prints out the specific MIDI events that are triggered, so that I could identify what exactly was going on with my Alesis Q49 keyboard. This script merely tests the basic MIDI functionality provided by PyGame in order to get the MIDI devices available and poll the default input device for events.
The first thing I needed to test was that I could actually get PyGame working, so that it could detect MIDI events from my Alesis Q49 MIDI keyboard.
Each script builds on the last, so that I'm closer to solving the overall MIDI synthesizer task with each increment. Within the Incremental Scripts folder, I have 6 Python scripts and one plain text file that I wrote during my incremental coding process.
That is, instead of tackling the final script at once, I like to write smaller scripts that break up the problem into smaller, separate subproblems so that I can test different pieces of the project one step at a time. I personally like to engage in an incremental coding process. You can make use of my incremental scripts to do this modification as well. If you have your own MIDI keyboard, it will be pretty easy to go in and modify my script so that it works for your MIDI keyboard. You can find more about the hardware/software I used from the following links:
ALESIS Q49 WONT PLAY SERIES
The audio is generated in real time using a second-order difference equation that generates a series of time-domain output values. This code does not make use of any pre-recorded audio. That is, when you play a note on the MIDI keyboard, the script will detect the note using the MIDI functionality in PyGame and play the appropriate pitch based on which note you played using PyAudio. This project makes use of the PyGame and PyAudio packages within Python to detect MIDI events triggered from my Alesis Q49 MIDI keyboard and then output audio corresponding to the pitches played. To actually run the main MIDIKeyboardSynthesizer.py script, you will need to use the hardware/software specifically listed below. For a more detailed explanation of my project, please read the Report.pdf file. This README only covers a general overview of the different scripts that you will find in this repository. This is the README for my Python MIDI Synthesizer project, which I completed in Fall 2015 as part of EE4163 (DSP Lab) at the NYU Tandon School of Engineering with Professor Ivan Selesnick.
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