Presentation on theme: "Visible sounds Created by: Gyula Nyerges Instruments."— Presentation transcript:
Visible sounds Created by: Gyula Nyerges
Instruments Try to guess what kind of musical instrument you are hearing! Time-avarage holographic interferograms
Standing waves Linear (bowed string) Take a look at the movements of the string lighted by a strobe light! Two-dimensional systems (square plate)
Kind of material is important Bells made of different materials –C–C–C–Copper –B–B–B–Brass –L–L–L–Leaden Try them! Sonic speed varies with the medium the sound travels through.
Human voices What is the difference between vowels? –a–a–a–a –e–e–e–e –i–i–i–i –o–o–o–o –U–U–U–U Use the microphone, and pay attention to the various spectras!
Handmade instruments There are a lot of things around the house that can be used as a musical instrument. Cover Cover Bottle Bottle Spoons Spoons Straw Straw
Measuring of the sonic speed Make a horn out of a drinking-straw! Measure its length, and the frequency of the produced sound! You can calculate the sonic speed using these data. Example:
Doppler- effect Revolving pipe Spin around the whistle above your head, and at the same time blow into the tube. The audience hears sounds with different frequencies.
Retardation, acceleration Normal tempo Normal tempo Slow down Slow down Rev Rev Back Back
Animal-sounds Bat ( quarter speed) Bat ( quarter speed) Dolphin ( quarter speed) Dolphin ( quarter speed)
Variable stars Available data: Available data: –Brightness –Color index surface temperature –Doppler shift of absorption lines radial velocity pulsation diameter
Changes in the state of a variable star as a function of time
Model of star’s working The change in pressure within the interior of the star is actually a very deep sound.
Star-horn Star-horn Overtones in the case of a whistle based on organ-pipes and a stellar model
Variable stars Surface waves Surface waves Stars don't just pulsate radially, which further complicates the model.
Sources Utunk a csillagokba (Way to stars) – CD-ROM Animations by Zoltán Kolláth Utunk a csillagokba (Way to stars) – CD-ROM Animations by Zoltán Kolláth home.snafu.de/ulisses/analysis/spec1.htm home.snafu.de/ulisses/analysis/spec1.htm metal.elte.hu/~phexp/st_kgy.htm metal.elte.hu/~phexp/st_kgy.htm