2007:Multiple Fundamental Frequency Estimation & Tracking

Description

That a complex music signal can be represented by the F0 contours of its constituent sources is very useful concept for most music information retrieval systems. There have been many attempts at multiple (aka polyphonic) F0 estimation and melody extraction, a related area. The goal of multiple F0 estimation and tracking is to identify the active F0s in each time frame and to track notes and timbres continuously in a complex music signal. In this task, we would like to evaluate state-of-the-art multiple-F0 estimation and tracking algorithms. Since F0 tracking of all sources in a complex audio mixture can be very hard, we are restricting the problem to 3 cases:

1. Estimate active fundamental frequencies on a frame-by-frame basis.

2. Track note contours on a continuous time basis. (as in audio-to-midi). This task will also include a piano transcription sub task.

3. Track timbre on a continous time basis. - This task has been CANCELED due to lack of participation.

Data

A recording of fifth variation from L. van Beethoven Variations from String Quartet Op.18 N.5. Each part is recorded separately while the performer is listening to the other parts through headphones. Later the parts are mixed to a mono 44.1kHz/16bits file. Synthesized pieces using RWC MIDI and RWC samples. Includes pieces from Classical and Jazz collections. Polyphony changes from 1 to 4 sources. Polyphonic piano recordings generated using a disklavier playback piano. So, there will be 6, 30-sec clips for each polyphony (2-3-4-5). So a total of 30 examples, plus there will be 10 30-sec polyphonic piano clips. Please email me about your estimated running time (in terms of n times realtime), if we believe everybodyΓÇÖs algorithm is fast enough, we can increase the number of test samples. (There were 90 x real-time algo`s for melody extraction tasks in the past.) All files will be in 44.1kHz / 16 bit wave format. Development set can be found at Development Set for MIREX 2007 MultiF0 Estimation Tracking Task. Send and email to mertbay@uiuc.edu for the username and password.

Evaluation

For task 1 (frame level evaluation), systems will report a number of active pitches every 10ms. Precision (the portion of correct retrieved pitches to all pitches that was retrieved for that frame) and recall (the portion of correct pitches to all ground truth pithces for that frame) will be reported. A returned pitch is assumed to be correct if it is around a semi tone interval (+ - 3%) of a ground truth pitch for that frame. One ground truth pitch can only be associated with one returned pitch. Also as suggested, an error score as described in Poliner and Ellis p.g. 5 will be calculated. The frame level ground truth will be calculated by YIN and hand corrected.

For task-2 (note tracking), again precision (the number of correctly transcribed ground truth notes to the number of ground truth notes for that input clip) and recall (# of correctly transcribed ground truth notes to the number of transcribed notes). A ground truth note is assumed to be correctly transcribed if the system returns a note that is with in a semitone interval of that note AND the returned note`s onset is within a 50ms range( + - 25ms) of the onset of the ground truth note, and its offset is within 20% range of the ground truth note`s offset. Again, one ground truth note can only be associated with one transcribed note.

The ground truth for this task will be annotated by hand. An amplitude threshold relative to the file/instrument will be determined. Note onset is going to be set to the time where its amplitude rises higher than the threshold and the offset is going to be set to the the time where the note`s amplitude decays lower than the threshold. The ground truth is going to be set as the average F0 between the onset and the offset of the note. In the case of legato, the onset/offset is going to be set to the time where the F0 deviates more than 3% of the average F0 through out the the note up to that point. There is not going to be any vibrato larger than a semitone in the test data.

Different statistics can also be reported if agreed by the participants.

Submission Format

Submissions have to conform to the specified format below:

doMultiF0 "path/to/file.wav"  "path/to/output/file.F0" 

path/to/file.wav: Path to the input audio file.

path/to/output/file.F0: The output file.

Programs can use their working directory if they need to keep temporary cache files or internal debuggin info. Stdout and stderr will be logged.

For each task, the format of the output file is going to be different: For the first task, F0-estimation on frame basis, the output will be a file where each row has a time stamp and a number of active F0s in that frame, separated by a tab for every 10ms increments.

Example :

time	F01	F02	F03	
time	F01	F02	F03	F04
time	...	...	...	...

which might look like:

0.78	146.83	220.00	349.23
0.79	349.23	146.83	369.99	220.00	
0.80	...	...	...	...

For the second task, for each row, the file should contain the onset, offset and the F0 of each note event separated by a tab, ordered in terms of onset times:

onset	offset F01
onset	offset F02
...	... ...

which might look like:

0.68	1.20	349.23
0.72	1.02	220.00
...	...	...

The submission system will up soon. The deadline will be August 30th, participants are encouraged to submit earlier.

Poll

<poll> Would you like the maximum number of concurrent sources given as an input parameter to the systems? Yes No </poll>

The maximum number of polyphony will NOT be an input to the systems.

Comments

See the Discussion Page for Multiple Fundamental Frequency Estimation & Tracking

Potential Participants

If you might consider participating, please add your name and email address here and also please sign up for the Multi-F0 mail list: Multi-F0 Estimation Tracking email list

• Koji Egashira (egashira (at) hil_t_u-tokyo_ac_jp)
• Stanis┼éaw Raczy┼äski (raczynski (at) hil_t_u-tokyo_ac_jp)
• Pierre Leveau (pierre.leveau (at) enst_fr)
• Valentin Emiya (valentin.emiya (at) enst_fr)
• Chunghsin Yeh (cyeh (at) ircam_fr)
• Emmanuel Vincent (emmanuel.vincent (at) irisa_fr) and Nancy Bertin (nancy.bertin (at) enst_fr)
• Matti Ryyn├ñnen and Anssi Klapuri (matti.ryynanen (at) tut_fi, anssi.klapuri (at) tut_fi)
• Ruohua Zhou (ruouhua.zhou@qmul.ac.uk)
• Arshia Cont (acont (_at_) ucsd.edu)
• Chuan Cao (ccao (at) hccl.ioa.ac.cn)
• Graham Poliner and Dan Ellis ({graham,dpwe} (at) ee.columbia.edu)

Moderators

Mert Bay mertbay@uiuc.edu,Andreas Ehmann aehmann@uiuc.edu,Anssi Klaupri klap@cs.tut.fi