From CCRMA Wiki
Revision as of 11:10, 8 December 2010 by Ravik
- To *aid* musicians in creating melodies
- To modify melodies out of existing ideas
- Personal interest in softwares that 'use' 'intelligence'
- It's a challenge of placing notes in time
- The code almost exclusively is about designating time values to different pitches as the melody proceeds
- Take several attributes from the user input.
- Ideas considered for this project to create the output: Scale and 'speed' of the input
- The user interacts initially by giving an input and the engine immediately takes over the control, computes and plays the output.
- The program uses the RtAudio and RtMidi libraries for computing realtime audio and accepting real time input from the user.
- The Karplus Strong synth model is the 'voice' of the project.
- The number of notes that the user would like to give as the input can be set within the program. (This is kinda clumsy, so I am ACTUALLY working on trying to gauge the input in a different way)
- A heavy amount of information is used from the input:
- For example, if the user enters an input starting in C4, the output is in C Major. The system currently looks for the C Major, D Minor and G Major scales.
- Another piece of information that's used from the input is the timing. If the average deltatime between different notes of the input is within a certain threshold, the song is considered 'fast-paced' otherwise, the overall contour of the song is in terms of its speed is mild.
- For inputs with less average deltatime, the AABA model is used to generate the melody. The program builds patterns since melody is all about repetition and patterning.
- Software Design/Architecture
- The system basically consists of the Karplus Strong synth class, a timer section, a scales section and a melody generation section.
- The Karplus Strong synth class is mostly derived from HW2 of this course, save a FEW changes.
- The timer section is implemented within the RtAudio Callback fucntion (functon audio_callback)
- The scales and melody are implemented in separate header files for clear delineation of functionality and modularity.
- Scales header file is called 'Scales.h' and Melody header file is called 'Melody.h'.
- A good measure of testing is how *tasteful* the output sounds. This is a matter of preference, taste and a little bit of intuition into the next possible note.
- Al midi keyboard should be hooked up to the computer in order to give the initial input. A virtual keyboard is a nice idea and MidiKeys serves the purpose.
- I worked on the project by myself (Ravi Kondapalli, ravik at ccrma)
- Get an OOP version of Karplus Strong working (3rd Week, Nov)
- Implement the timer logic (3rd Week, Nov)
- Implement a pitch logic into the timer (3rd Week, Nov)
- Design a way so that RtAudio waits until RtMidi is done with the user input (3rd Week, Nov)
- Build the scales and check the user input (4th Week, Nov)
- Build the melody (4th Week, Nov and 1st Week, Dec)
- Graphics? 2D Graph like plot? (4th Week, Nov and 1st Week, Dec)
- A better way to setup timing
- STK/Fluidsynth instead of a Karplus Strong voice
- Graphical Interactive output
- More and more and more intuition match
- More and more and more pattern building
- Please download this project from here: https://ccrma.stanford.edu/~ravik/melody_generator.zip and provide some feedback! Thanks!!