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Audio - acoustics animations, java applets, flash related subject:
Physics: sound java applets and
animations |
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Active Filters
with operational amplifiers Design of active filters with operational
amplifiers |
| Acoustics and
vibration animations animations which visualize certain concepts concerning acoustics and vibration |
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Akustische Täuschungen
in German |
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Amplitude and Frequency Vibrato Amplitude vibrato is amplitude modulation
(AM) in which the loudness fluctuates with a frequency of 1 to 10Hz. Frequency
vibrato is frequency modulation (FM) in which the pitch fluctuates with a
frequency of 1 to 10Hz |
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Comment fonctionne un amplificateur? en Français |
| Decibel
size the highest frequency that can be produced without aliasing problems
is ~3500Hz, sound level is changed with successive steps of -10dB, -3dB, -5dB |
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Die
Tonleiter des Pythagoras |
| Diatonic scale
Pythagorean tuning of the diatonic scale works well for monophonic music, ... |
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Digital filter applets
IIR Filter's Response, FIR Filter's Response, Design Low Shelve, High Shelve,
Peaking, Notch filters, Design equalizers by Window Function Algorithm,
Calculate spectrum, Generate sine, cosine, square and triangle waves, CR
Filter's Response (Analog), Step and Impulse Response (Analog), Put Laplace
transfer function |
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Digital filters applet
this java applet is a demonstration of digital filters. You should hear a noise
waveform when the applet starts up |
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Digital filters applet
Digital filters applet, IIR digital filter design applet |
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Digital filters applet
Digital filters applet, This is an applet that allows you to design digital
filter graphically |
| Digital signal
processing and filters DSP java applets |
| Discrete
time Fourier series you can enter the magnitude and phase spectra with the mouse, and then observe the phasor
frequency components and the generation of the signal from these frequency components. For the second applet you can enter a value of N between 4 and 32, and then enter
either a signal or the frequency spectra. Only one period of the signal and one repetition of the spectra are shown |
| DSP
editor an online DSP laboratory for education. Offers an online simulation enviroment for the engineering student |
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DTMF Tone
Generator Applet The applet generates DTMF (Dual Tone Multi-Frequency) tones
as used on TouchTone phones |
| Equal loudness tester
this site allows you to measure equal loudness curves--the frequency response of your own ears. The flash script allows you to play sound files with a range of
frequencies and sound levels with the click of a mouse |
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Experiments in psycho-acoustics |
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Filtres
en Français |
| Filtres de Rauch
HPF, LPF, BPF,
en Français |
| Filtres de Sallen et Kay
en Français,
HPF, LPF, BPF |
| Filtre de Wien
en Français |
| Filtres passifs (exemples)
Wien, Colpitts, RC, T filtre, en Français |
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FIR
Digital Filter Demo applet |
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Fourier Fourier Synthesis, A periodic signal can be described by a Fourier
decomposition as a Fourier series, i. e. as a sum of sinusoidal and cosinusoidal
oscillations, ... |
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Fourier analysis Flash |
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Fourier approximations and music |
| Fourier
en Français, Séries de Fourier
en Français |
| Fourier
fourier synthesis, you can change the magnitude of each Fourier functions,
sound effect |
| Fourier
decomposition building a wave shape from sines and cosines |
| Fourier series
the user may choose the first 21 coefficients of a Fourier series by means of
scroll bars and look at the graph of the resulting function |
| Fourier
series approximation Java applet that displays Fourier series
approximations and corresponding magnitude and phase spectra of a periodic
continuous-time signal |
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Frequenties combineren en luisteren
Fourier, in Dutch |
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Fundamental &
overtones the fundamental and first three overtones of a vibrating system |
| Filter
java experiments low pass filter, high pass filter, RC integrator, RC differentiator, resonant filter |
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Harmonic series
the first 20 partials of a harmonic series for the fundamental pitch C2 (ca.
65.4 Hz.) expressed in traditional musical staff notation with frequency
multiples indicated between the staves |
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Interactive digital filter design |
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Linear and logarithmic scales This demonstration compares ascending linear
and logarithmic musical scales |
| Listen to Fourier
series needs real audio player |
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Listen to
Fourier series |
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Loudspeakers
How a speaker works |
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Multimedia approach
to the harmonic series |
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Ohm's
Law of Hearing Ohm's law of hearing states that our brain's do not process
phase information for slowly varying sounds but does respond to changes in
amplitude and frequency, ... |
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Primary
Beats and Combination Tones When two sine waves of equal amplitudes but
different frequencies are played simultaneously, several interesting sounds can
be heard |
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Push pull amplifier Push pull amplifier |
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RC
filter respons Circuits An applet to calculate Frequency and Step response
for CR Filter |
| Sampling and
reconstruction of periodic signals Sampling and reconstruction of periodic
signals |
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Sampling and
reconstruction of periodic signals |
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Sampling and discrete
time Fourier transform the first step in obtaining a signal for DSP is to
sample an analog signal eg instrumentation, audio or video signal. Technically
this usually involves a sample and hold and A/D converter, Discrete Time Fourier
Transform (DTFT) |
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Seeing
with your ears java demonstration of an auditory display for vision substitution. Includes image sonification and spectrogram generation |
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Simulation de filtres
en Français, a tip |
| Signal
sampling at various sampling frequencies Java applet for signal sampling
at various sampling frequencies, and signal reconstruction from samples using
various low-pass filter cutoff frequencies |
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Standard “twin feeder” loudspeaker cable |
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Somme de fonctions sinusoïdales sons complexes à
partir de leurs neuf premiers harmoniques,
en Français |
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Synthesizer
in German |
| Time
domain vs. frequency domain 3-d plot of frequency, amplitude and time shows the fundamental of a sine wave and up to 3 harmonics, as they are formed
by rotating vectors |
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Temperament brief introduction to the physics and psychophysics of music,
with an emphasis on temperament, the relationship between notes,
Flash |
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Text To Speech |
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Twin feed properties the basic properties of a standard “twin feeder”
loudspeaker cable |
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Vibrato- amplitude and frequency Amplitude vibrato is amplitude modulation
(AM) in which the loudness fluctuates with a frequency of 1 to 10Hz. Frequency
vibrato is frequency modulation (FM) in which the pitch fluctuates with a
frequency of 1 to 10Hz |
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Virtual pitch A periodic complex waveform is the sum of sine waves that
comprise a harmonic series whose fundamental frequency (first harmonic) has the
same period as the complex wave, ...., brain senses a frequency that is not
present in the original wave |
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Vowels A formant is a broad resonance produced by the pharynx and oral
cavity. By following the peak frequencies as a series of vowels are elided, one
can identify the lowest three formants for each sung vowel |
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Horizontaal |
Sound waves  related subject:
Physics: sound java applets and
animations |
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Animations of Acoustic Waves Harmonics, Shepard/Risset Tones, Beats, The
Sound of Filtering, Sum and Difference Tones |
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Audio Beat
Frequencies Demonstrating Audio Beat Frequencies |
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Battements en Français |
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Beats
caused by the interference between two waves of nearly equal frequency |
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Beats
Beats (periodic rise and fall in intensity) are produced when two waves of
nearly equal frequency are added. The beat frequency is the difference of the
two frequencies, while the resultant waveform itself varies at the mean of the
two frequencies |
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Beats
Primary Beats and Combination Tones, FFT, waveform, frequency difference,
frequency discrimination, combination tones |
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Beats
Vary the two frequencies, f1 and f2, between 1 und 100 Hz and see the
corresponding beat pattern emerge |
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Beating waves
the animation shows how the waves in the top and middle panels add together to
create a beat pattern in the bottom panel, beating waves |
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Doppler effect
Doppler effect |
| Doppler effect
an emergency ambulance with switched on siren passes a person who is standing at
the street |
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Doppler effect
simulation of the relativistic and non-relativistic Doppler effect. There is also also a tutorial about writing applets |
| Doppler
effect 2 Doppler effect |
| Doppler
effect 3 |
| Doppler
effect 4 |
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Doppler
effect the animation represents a cross section of a three-dimensional sound
wave propagating away from a moving source |
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Doppler
effect with interference Doppler effect with two sources so
you can see interference patterns |
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Doppler radar |
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Longitudinal wave
Flash |
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Longitudinal wave
Flash |
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Shock
waves source moves with the velocity of
sound, source moves with subsonic velocity, source of acoustic waves moves with
supersonic velocity |
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Sound
beats |
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Sound wave approximation |
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Sound wave interference explains what happens to the energy of sound waves
when the waves interact, Compare and contrast constructive interference and
destructive interference |
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Sound
waves
Flash |
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Sound
Waves a tip |
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Superposition of sound waves audio beat frequencies |
| Superposition of
two waves two sine waves travelling in the same direction: constructive
and destructive interference, two sine waves travelling in opposite directions
create a standing wave, superposition of waves, two sine waves with different
frequencies: beats |
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Tone beats when two sounds are very similar in frequency, you'll hear pulses
due to the nature of waves. Try to determine several mystery frequencies |
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Traveling wave |
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Last updated on:
2008-06-12
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