Difference between revisions of "Gesture Signal Processing and Music"
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** Proportional to force (Newton's 2nd law of motion: F = ma ) | ** Proportional to force (Newton's 2nd law of motion: F = ma ) | ||
* Jerk: j = da/dt | * Jerk: j = da/dt | ||
| + | |||
| + | == Interlude #1: Open Sound Control == | ||
| + | * Open Sound Control: http://opensoundcontrol.org/ | ||
| + | * iPod Touch has 3 axis accelerometer | ||
| + | * We will use TouchOSC to transmit accelerometer data as OSC messages over wifi to Max/Pd | ||
| + | ** http://hexler.net/software/touchosc | ||
| + | |||
| + | == Interlude #2: Filtering of Audio Signals == | ||
| + | * Can view any sound as being composed of sinusiodal waves at different frequencies | ||
| + | * A filter removes energy at only certain frequencies: | ||
| + | **A low-pass filter removes high freqs. | ||
| + | **A high-pass filter removes low freqs. | ||
| + | ** A band-pass only lets certain middle frequencies through. | ||
Revision as of 23:28, 11 October 2009
Contents
Gesture and Measuring Movement
- What is a gesture? Physical. Bodily: hands, face, posture. Non-verbal. What do gestures communicate? Is a gesture more like a button or a handle?
- What is a musical gesture?
Techniques for measuring human movement
- Camera-based
- 2D image processing
- 3D Motion Capture using many cameras
- Goniometry: measuring joint angles with physically attached sensors
- Laetitia Sonami's Lady's Glove: http://www.youtube.com/watch?v=HYTrNOmSRSo&feature=player_embedded
- Electromyography: measures muscle activation by measuring electrical activity
- Pamela Z's controller (which I believe uses emg): http://www.pamelaz.com/VociMov.html
- With accelerometers attached to the body (e.g. wiimote, iphone)
Really basic physics
- Position: x
- Velocity: v = dx/dt
- Acceleration: a = dv/dt
- Proportional to force (Newton's 2nd law of motion: F = ma )
- Jerk: j = da/dt
Interlude #1: Open Sound Control
- Open Sound Control: http://opensoundcontrol.org/
- iPod Touch has 3 axis accelerometer
- We will use TouchOSC to transmit accelerometer data as OSC messages over wifi to Max/Pd
Interlude #2: Filtering of Audio Signals
- Can view any sound as being composed of sinusiodal waves at different frequencies
- A filter removes energy at only certain frequencies:
- A low-pass filter removes high freqs.
- A high-pass filter removes low freqs.
- A band-pass only lets certain middle frequencies through.
