Acoustics Animations & Sound Interactive Demos  Links                                      


Acoustics and Vibration Animations - Animations visualize certain concepts concerning acoustics and vibration, By Dan Russell, Ph.D., Associate Professor of Applied Physics at Kettering University in Flint, MI
From image to sound - The vOICe applet. Draw your own 64 64, 16 grey-tone image and
immediately hear the corresponding 64-voice polyphonic soundscape being synthesized on the fly!  htttp://
Sound to Graph to Sound with JavOICe - Peter Meijer in Eindhoven, NL has developed a Java applet which "sonifies" 64 x 64 gifs or jpegs (256 colors max) by treating them as graphs of frequency against time and assigning each pixel in the grid a tone with brightness realized as loudness.
Interactive Community in Sound - P-Soup: . This is a simple but beautiful demonstration of how visual patterns and sound patterns can work together. You might need to wait a couple of minutes for the application to start, and there are no instructions or explanations, but just click anywhere to experience it. If you wait, you may hear interactions by other users!
Decibels - This is an audio demonstration of decibels. A sound card is required to play the 250Hz tone.
Circularity in Pitch Judgment - One of the most widely used auditory illusions is Shepard's (1964) demonstration of pitch circularity, which has come to be known as the "Shepard Scale" demonstration. The demonstration uses a cyclic set of complex tones, each composed of 10 partials separated by octave intervals. THe tones are cosinusoidally filtered to produce the sound level distribution shown below, and the frequencies of the partials are shifted upward in steps corresponding to a musical semitone (= ~ 6 %).
Auditory Perception - Some basic principles of . First we examine the notion of pitch: how do we measure "high" and "low"; what is the nature of the correlation between physically measurable aspects of a tone's frequency and its perceived "height?" Next, we move on to a discussion of tones in an effort to differentiate the "height" of a tone from its "chroma." Finally, we discuss tonal paradoxes in which the standard separation of "height" and "chroma" is called into question.
Computer models of the middle ear - Computer models of the middle ear using the finite-element method, which involves dividing a complex structure into a large number of simple parts.
JAVA Sound and Hearing Demonstrations
Animations of Processes within the Ear
Simulation of Effects of Cochlear Damage - This demonstration consists of two sound passages (speech and music) electronically filtered so as to simulate the effective sounds reaching the ears of listeners who have (a) Normal ears, or those with either (b) Moderate or (c) Severe Damage.
X-RAY Database for Speech Research - The X-ray Film Database is a collaborative project by Dr. Kevin Munhall of Queen's University and Drs. Eric Vatikiotis-Bateson and Yoh'ichi Tohkura of ATR Human Information Processing Research Laboratories, Kyoto, Japan. It was conceived to preserve cineradiographic vocal tract footage, to make the images available to the speech research community, and to develop techniques for the automated digital processing of the images.
The Vowel Quadrilaterals for Stereotypical National Dialects - American English, British English
LBJ & the Helium Filled Astronaut - Producer Larry Massett shares a found piece of tape. It's a rare recording of the President of the United States from 1964. At the time, the US Navy had a project called "SeaLab"... Commander Carpenter is no longer underwater; he's in a decompression chamber. He's breathing air in which nitrogen- the gas which can give people the bends- has been replaced by helium. Helium is harmless, but it distorts the voice. When he speaks, Commander Carpenter sounds like Mickey Mouse.
Drop in frequency of vocal formants due to the decrease in the speed of sound in a heavy gas - Snort a lungfull of sulfur hexafluoride and talk and sing normally. Your voice takes on a deep, muffled character due to the decrease in frequency of your vocal formants.
Simplified Vowel Synthesis Interface - This interface allows you to synthesize non-nasalized monopthongal English vowels using the Klatt synthesizer. It provides control over vowel duration, voice pitch, and the first three formant frequencies.
Categorical Perception - Categorical perception means that a change in some variable along a continuum is perceived, not as gradual but as instances of discrete categories. The test presented here is a classical demonstration of categorical perception for a certain type of speech-like stimuli. The stimuli in the experiment are synthetic syllables in which the second formant is varied in equal steps. Depending on the precise parameter values, the resulting sounds are perceived as `ba', `da' or 'ga'.
Interactive Vocal Tract Saggital Section - Design vocal tract cross-sections to order with this interactive tool.
Speech Synthesizers - Development, Segmental synthesis by rule, Synthesis by rule of segments and sentence prosody, Fully Automatic text-to-speech conversion. Audio recordings from the Appendix of D. Klatt, "Review of text-to-speech conversion for English," J. of the Acoustical Society of America, 82(3) September 1987.
Bird Gard - sound demo for bird control with 8 built-in distress calls you program yourself.
Sonification of Multiple Electrode Human Scalp Electroencephalogram (EEG)
Tricks and Techniques for Sound Effect Design
Quack Sound Effects Studio - QUACK Sound Effects Studio lets you create your own original sound effects with an easy to use visual editor. Simply select basic components from the toolbar, and plug them together in any combination, and create exactly the sound you need.
Digital Sound Effects  - Firework sound effects, noise for densensitization of dogs and nervous phobic people. Thunder claps thunderstorm sound for reducing phobic reactions in dogs or humans by desensitization techniques. Wailing siren sound for desensitization.
Seeing Sound - I put some water into a plastic pan. The water was about one millimeter deep, so that waves would be visible on its surface...  I hit a few notes with different pitches and volumes on the synthesizer and watched and videotaped what happened to the water.
Audio Paradoxes - The best known audio paradox is known as Shepard's paradox. It is the audio equivalent of the endless staircase illusion made famous by M. C. Escher. In this audio paradox a series of tones can be made to sound as if they are ascending or descending in pitch forever.  Two other audio paradoxes: One paradox demonstrates that it is possible to make the ear believe a series of tones are decreasing in pitch when they are actually increasing in pitch. The last paradox demonstrates that it is possible to make the ear believe that a tempo is getting quicker when it actually remains constant. The audio samples are provided in MP3 audio format.
TeleSuonohologram - Head-bobbing and somewhere at the combined focal points an ephemeral, holographic sound&imagery merged as a whole. TeleSuonohologram is an audio and video recording system prototype concept which can merge and focus both sources and produce temporal experiences. The video monitor and amplified sound were contained within the focal positions of the parabola. (As ongoing moments in time, the ephemeral mirage fused image/sound was not technically "recordable.")                
Sound Waves and the Eardrum - Visual demo and another domos links to the following topics: Mechanical Wave, Longitudinal Wave, Pressure Wave, The Human Ear, Pitch and Frequency, Intensity/Decibel Scale