Audio - acoustics animations, java applets, flash

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

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

Die Tonleiter des Pythagoras

Diatonic scale Pythagorean tuning of the diatonic scale works well for monophonic music, ...

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

Digital filters applet this java applet is a demonstration of digital filters. You should hear a noise waveform when the applet starts up

Digital filters applet Digital filters applet, IIR digital filter design applet

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

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

ESL animation electrostatic loudspeaker animation

Experiments in psycho-acoustics

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

FIR Digital Filter Demo applet

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, ...

Fourier analysis Flash

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

Frequenties combineren en luisteren Fourier, in Dutch

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

Guitar A String Applet

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

Interactive digital filter design

Linear and logarithmic scales This demonstration compares ascending linear and logarithmic musical scales

Listen to Fourier series needs real audio player

Listen to Fourier series

Loudspeakers How a speaker works

Loudspeakers How a speaker works, The coil generates a magnetic field that switched its polarity (north and south) when alternating current passes into it. The changes alter the attraction or repulsion of the coil magnet to the permanent magnet causing the coil magnet to move. The movement of the coil causes a diaphragm to move which creates the sound waves we hear

Loudspeaker animation

Loudspeaker animation ACOUSTIC WAVES

Loudspeaker animation An animation of a sound wave illustrating the way a sound wave propagates

Loudspeaker animation An animation of a sound wave illustrating the way a sound wave propagates, longitudinal wave

Microphone Microphone animation, click on Description

Multimedia approach to the harmonic series

Noise Noise is unwanted sound. Noise can be produced by many sources - man's vocal cord, a running engine, a vibrating loudspeaker diaphragm, an operating machine tool, and so on. Click on the demo buttons and you will hear the noise from different sources

Notch Filter

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, ...

Primary Beats and Combination Tones When two sine waves of equal amplitudes but different frequencies are played simultaneously, several interesting sounds can be heard

Push pull amplifier Push pull amplifier

RC filter respons Circuits An applet to calculate Frequency and Step response for CR Filter

Sampling and reconstruction of periodic signals This applet explains the sampling of a continuous signal and the reconstruction of this signal from its samples

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)

Seeing with your ears java demonstration of an auditory display for vision substitution. Includes image sonification and spectrogram generation

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

Standard “twin feeder” loudspeaker cable

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

Temperament brief introduction to the physics and psychophysics of music, with an emphasis on temperament, the relationship between notes, Flash

Text To Speech

Twin feed properties the basic properties of a standard “twin feeder” loudspeaker cable

Twin-T Filter

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

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

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

Horizontaal

Sound waves

related subject: Physics: sound java applets and animations

Animations of Acoustic Waves Harmonics, Shepard/Risset Tones, Beats, The Sound of Filtering, Sum and Difference Tones

Audio Beat Frequencies Demonstrating Audio Beat Frequencies

Battements en Français

Beats

Beats caused by the interference between two waves of nearly equal frequency

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

Beats Primary Beats and Combination Tones, FFT, waveform, frequency difference, frequency discrimination, combination tones

Beats Vary the two frequencies, f1 and f2, between 1 und 100 Hz and see the corresponding beat pattern emerge

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

Doppler effect Doppler effect

Doppler effect an emergency ambulance with switched on siren passes a person who is standing at the street

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 4

Doppler effect the animation represents a cross section of a three-dimensional sound wave propagating away from a moving source

Doppler effect with interference Doppler effect with two sources so you can see interference patterns

Longitudinal wave Flash

Shock waves source moves with the velocity of sound, source moves with subsonic velocity, source of acoustic waves moves with supersonic velocity

Sound beats

Sound wave approximation

Sound wave interference explains what happens to the energy of sound waves when the waves interact, Compare and contrast constructive interference and destructive interference

Sound waves Flash

Sound Waves a tip

Sound How Sound Reaches You

Sound Speed of sound animation

Sound Wave envelopes, See the difference in wave envelopes created by various sound makers

Sound Pulse of sound, See how a single pulse of sound travels in a solid

Sound as a mechanical wave A wave is a disturbance of a medium which transports energy through the medium without permanently transporting matter. In a wave, particles of the medium are temporarily displaced and then return to their original position

Sound Waves

Sound waves in gases See how sound waves travel in a gases

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

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

Traveling wave

Horizontaal

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