Visualization Experiments
From SpeechWiki
Visualization experiments include at least the following components:
- Visualization Interface Number 1 --- Timeline Audio ("timeliner")
This is intended to be lightweight for laptops or handhelds, similar to audacity.
- Visualization Interface Number 2 --- Milliphone
This is a command center interface, designed for the Cube.
- Feature Computation --- Signal Features
These features rapidly give an analyst information about the signal, e.g., spectrograms.
- Feature Computation --- Classification Features
These features measure the degree of match (confidence score) between the signal at any point in time, and a classification label of interest. Classification labels might be defined in advance (e.g., "explosion,"), or they might be defined by the analyst during a session.
Contents |
Minutes of 2009 Apr 10 noon meeting
Dramatis personae
Mark Camille Gradstudents Xi, Xiaodan, Sarah, Lae-Hoon Undergrad David Cohen
Tasks
Camille: keep developing timeliner
done: pan, zoom (mouse scrollwheel) done: gui using ruby-opengl, for all OSes: heron ibex leopard xp vista todo: scrollweel-glut workaround for windows todo: inline C generate texturemaps
Camille: keep developing milliphone, hand off to gradstudents
All: run timeliner
load a recorded sound load precomputed features to display select and play intervals
Grads: choose features, code feature generators
David: measure and model computation speed of feature generators
Camille: map features to HSV
Grads: design and pilot-study experiments
Grads: recruit analyst-subjects, schedule experiments
Grads: September, run 5-subject experiment. November, present at FODAVA meeting, Richland WA
Notes
How combine features?
Feature generators read a recorded sound and write a feature file.
format: http://labrosa.ee.columbia.edu/doc/HTKBook21/node58.html#SECTION03271000000000000000 http://htk.eng.cam.ac.uk/ Sequence of feature vectors.
Later: stream not batch.
Experiment tasks:
find instances of a class of sound events find anomalous sounds (open-ended, vague)
Recorded sounds
AMI meeting room transcribed fieldrecorder/090216 fieldrecorder aircraft + webcam for ground truth play freqsweep through genelec into fieldrecorder. ignore clock drift. Keep data files small enough for our tools. toy ruby script plus short audio source files generates a long target file. Tweak script while tweaking apps.
Realtime server (later)
record audio circular buffer, a few months long compute features at multiple scales fast approximate algorithms for caching of features. stream all this to a googlemaps-ish server when client scrolls (pans) or zooms, it requests fresh data from server