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Sofia Dahl sof@imi.aau.dk
Sofia Dahl sof@imi.aau.dk
THE STRIKING MOVEMENT: How do percussionists control timing and - - PowerPoint PPT Presentation
THE STRIKING MOVEMENT: How do percussionists control timing and - - PowerPoint PPT Presentation
Sofia Dahl THE STRIKING MOVEMENT: How do percussionists control timing and dynamic level when drumming? Sofia Dahl sof@imi.aau.dk Stick movements for accented and unaccented drumstrokes Sofia Dahl sof@imi.aau.dk Whole limb motion trajectory
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Sofia Dahl sof@imi.aau.dk
Whole limb motion trajectory
Dahl, 2004
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Sofia Dahl sof@imi.aau.dk
Producing force from acceleration
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Sofia Dahl sof@imi.aau.dk
Dealing with the rebound
- The rebound from the surface can be incorporated in,
and be an aid for, the preparation for the nextcoming stroke.
- Necessary in order to play some fast patterns (e.g.
rolls)
- Strategies like the “Moeller stroke” also utilizes the
rebound
- Accelerating the stick over a longer runway makes
louder playing possible.
- ...but if the next stroke is to be softly played the
rebound may need to be controlled
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Sofia Dahl sof@imi.aau.dk
Measuring movement and sound in drumming
audio
motion capture
muscle activity contact force and duration
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Sofia Dahl sof@imi.aau.dk
Motion capture data for a single mf stroke
shoulder elbow wrist knuckle stick
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Sofia Dahl sof@imi.aau.dk
Single, isolated stroke at mf
Dahl et al, 2009
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Sofia Dahl sof@imi.aau.dk
How does controlling the rebound affect the sound?
- Separated single mf strokes
- allowed to ring out
- “Normal”
- play as normal, relaxed, stick free to rebound
- “Controlled”
- stop stick as close as possible to the drumhead directly after stroke
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Sofia Dahl sof@imi.aau.dk
“Normal” and “Controlled” strokes
controlled normal
stick knuckle wrist
Dahl & Altenmüller, 2008
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Sofia Dahl sof@imi.aau.dk
Vertical displacement of stick marker
controlled normal
Dahl & Altenmüller, 2008
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Sofia Dahl sof@imi.aau.dk
Contact force and duration
Dahl & Altenmüller, 2008
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Sofia Dahl sof@imi.aau.dk
Hz
Spectral centroid (considering 16-1000 Hz)
Dahl & Altenmüller, 2008
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Sofia Dahl sof@imi.aau.dk
Ratings for timbre and attack: results
full hard soft flat
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Sofia Dahl sof@imi.aau.dk
An “appropriate” strategy?
Player 1 Player 2
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Sofia Dahl sof@imi.aau.dk
Musicians’ focal dystonia
Defined as (painless) loss of voluntary motor control in highly trained movements (e.g. curling in/ over
- extension of fingers).
Neurological disorder Task-specific
(Altenmüller, Hand Clin., 2003)
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Sofia Dahl sof@imi.aau.dk
General movement patterns: healthy player
Part1: Left, 120 bpm, mf
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Sofia Dahl sof@imi.aau.dk
General movement patterns: dystonic patient
Pat5: Left, 120 bpm, mf
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Sofia Dahl sof@imi.aau.dk
Comparing left and right – phase plots
dystonic 50 bpm mf healthy 50 bpm mf
vertical velocity (m/s) vertical velocity (m/s) Vertical displacement (mm)
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Sofia Dahl sof@imi.aau.dk
Comparing left and right – phase plots
dystonic 120 bpm mf healthy 120 bpm mf
vertical velocity (m/s) vertical velocity (m/s) Vertical displacement (mm)
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Sofia Dahl sof@imi.aau.dk
dystonic 300 bpm mf healthy 300 bpm mf
Comparing left and right – phase plots
vertical velocity (m/s) vertical velocity (m/s) Vertical displacement (mm)
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Sofia Dahl sof@imi.aau.dk
dystonic 300 bpm mf healthy 300 bpm mf
Comparing left and right – phase plots
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Sofia Dahl sof@imi.aau.dk
IOI (ms) patient 1
Comparing left – right
(120 and 300 bpm )
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Sofia Dahl sof@imi.aau.dk
Patient 1, left arm, f, 300 bpm
front view top view
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Sofia Dahl sof@imi.aau.dk
Learning to play
Playing for fun Drop out professional Professional beginner
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Sofia Dahl sof@imi.aau.dk