Some data scraping tools

Data,Reference,Scientific,Visual — Ali Momeni @ 7:14 pm

A starting point…

Gwen Stevenson – “Infinite Mass” (2010)

Uncategorized — Ali Momeni @ 4:58 pm

<iframe width=”500″ height=”375″ src=”//www.youtube.com/embed/tW-aOlb2Xjw” frameborder=”0″ allowfullscreen></iframe>

<p>”This work is concerned with how we, as human beings, inhabit this world and experience our place in it. We live in both a physical world and a spiritual metaphysical world. Both exist within and around us but are experienced very differently. This work sets up a juxtaposition of forms that suggest this experience. Mass is used as a visual form to convey notions of the bounded physical domain. The unbounded metaphysical domain is conveyed by movement of sound between the forms. The tangible stationary bulk of the suspended spheres co-exist with the intangible ephemerality of the sound piece. “</p>

“Swarm Light” by rAndom International (2010)

White lights hung above the viewer respond to sound and make organic-looking patterns and waves.

Max Extensions: Part 1

Arduino,Hardware,Max,OpenCV,Sensors — Ali Momeni @ 12:17 am

In order to add extra functionality to max, you can download and install “3rd party externals”.  These are binaries that you download, unzip and place within your MAX SEARCH PATH (i.e. in Max, go to Options > File Preferences… and add the folder where you’ll put your 3rd party extensions; I recommend a folder called “_for-Max” in your “Documents” folder).

Some helpful examples:

  • Physical Computing: Maxuino
    • how to connect motors/lights/solenoids/leds to Max with Maxuino
  • Machine Vision: OpenCV for Max (cv.jit)
  • Audio Analsyis for Max: Zsa Objects (Emmanuel Jourdain) and analyzer~ (Trista Jehan)

Enchanted Object: “Image Fulgurator” by Julius von Bismark (2007-8)

1_Enchanted Object,Assignment,Hardware,Sensors — Ali Momeni @ 9:50 pm

More…

 

sound sensing and arduino

Arduino,Audio,Sensors — Ali Momeni @ 3:45 pm

streaming audio from/to max

Audio,Max — Ali Momeni @ 2:49 pm

audio streaming related:

The Limits of Time Perception

Reference,Scientific — Ali Momeni @ 11:27 pm

Some of the key findings of experimental psychology in the perception of time
Reference: Hearing in Time by Justin London

STIMULI

  • Difference in stimuli mean difference in perception
    Experimental results in discrimination and perception are different for sonic and visual stimili.
  • Subjective Rhythmicization
    We group a series of identical, isochronous stiumuli into groups of twos and threes, i.e. we hear duplets and triplets or a two-beat or three-beat “measures” even when there are no structural cues.
  • Upper limit of subjective rhythmicization: about 1800ms
    Above 1800ms successive sounds are not heard as continuous; therefore we no longer hear them in terms of a coordinated motion or movement.
  • Connection between hearing/seeing rhythm and perceiving movement
    Successive visual stimuli presented within a certain temporal range give the illusion of motion

TIME RESOLUTION

  • Shortest perceived interval: ~2ms
    Usually measured as separation time required to discern that two tone onsents are present as opposed to one.
  • Shortest ordered onset distinction: ~20ms (10 times the previous number!)
    This is the shortest time necessary to discern which onset was first and which second.
  • Longest interval that we can perceived/performed rhythmically: 5-6 seconds
  • shortest perceptual duration regardless of sensory mode: around 130ms with %5-10 accuracy
    Also shortest discernible interval between to brief sounds: (around 100ms)
    Also the minimum time to allow for the cortical processing of musical elements (around 100ms).
    Also the fastest possible vocal articulation of rapidly repeated syllables (around 120ms).
  • Shortest musical beat/pulse: 200-250ms
    At intervals less than this range, subjects begin to tap every other beat (i.e. they sub-divide)
    But we can distinguish two onsets as two when they are 100ms apart! what’s up? Hearing a “beat” requires at least the potential for subdivision.
  • Shortest anti-phrase repeatable musical beat: around ~450ms
    Stimulus is a repeated tone, subject is asked to tap/clap in between the notes
  • The “Indifference Interval”: 600-700s
    This is the tempo at which a beat is subjectively neither “too fast” or “too slow”
    Also the time interval below which subjects overestimate, and above which subjects underestimate the elapsed duration
    Also the “spontaneous temp” or “natural pace”: the tempo at which subjects tap a finger with no other instructions (there’s great variation, but the mean is ~600ms)
    Spontaneous tempo varies with age: younger subjects (4-6 years) prefer ~400ms; suggests that “spontaneous tempo” is kinematically rooted (i.e. smaller body, faster tempo)
  • The “Just Noticeable Difference”: 200-250ms
    A basic psychological measure of perceptual acuity: the shortest perceivable difference in duration between two complex stimuli; e.g. Smallest perceivable difference of duration between two six-tone sequences over a wide range of inter-onset-intervals (from 100 to 1000ms)
    The JND is proportional to the total duration of the stimuli.
  • Subject Rhythmic Organization
    Differing contexts or modes of attention affect perception of duration/interval. For example, when performers are directed to shift their attention to different levels within the metrical hierarchy in a series of performances of the same passage, focusing on the eighth notes versus quarters versus half notes causes systematic shifts in tempo: Counting at higher levels leads to faster performances.

BIBLIOGRAPHY

London, J. (2004). Hearing in time: Psychological aspects of musical meter. New York: Oxford University Press.

Desain, P., & Windsor, L. (2000). Rhythm perception and production. Lisse ; Exton (PA): Swets & Zeitlinger Publishers.

 

Speakers, Transducers and Drivers

Audio,Hardware,Shopping — Tags: — Ali Momeni @ 7:32 pm

Speaker Drivers

Traducers

Drivers

Sensors and Biosensing

Hardware,Sensors,Shopping — Ali Momeni @ 4:28 pm

Heart-rate Sensors and Stethoscopes:

Toys/Game Controllers:

EEG sensors:

Finger Print Scanner:

Eye/Retina Scanners:

Touch Sensing:

Sensor vendors

External References

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