Video

This is an intuitive explanation of the effects of a perfect acoustic reflection at a single listening position when the source is within 1 wavelength of the reflecting surface. Note that all of the acoustical effects that you hear in this video are actually happening because of the surroundings. No extra artificial effects were added. For the video portion, the microphone and Sound Pressure Le...

This is an explanation and demonstration of phantom imaging in a 2-channel stereo playback system. The voice was recorded using a single cardioid microphone, 1 m from the source, in an anechoic chamber at Bang & Olufsen in Struer, Denmark. All stereo effects presented in this video were done using custom-made digital signal processing. Note that the values I use for the IAT and ITD examples wer...

This is a simple demonstration of the speed of sound in air. Note that all of the acoustical effects that you hear in this video are actually happening because of the surroundings. No extra artificial effects were added. I start by standing 1 m in front of the camera with the zoom set to 28 mm - we then changed to a 300 mm zoom. The microphone pair was kept in the same configuration for the who...

This is an introduction to three basic concepts in acoustics - impulse responses, flutter echo, and room modes. I make some sweeping statements in here - but the idea is to help to provide an intuitive understanding of what's going on... Not to help you design a concert hall... Note that all of the acoustical effects that you hear in this video are actually happening because of the surroundings...

This is an introduction to some basic concepts and vocabulary in the general area of room acoustics - with explanations and live demos. I make a couple of sweeping statements in here - but the idea is to help to provide an intuitive understanding of what's going on... Not to help you design a concert hall... Note that all of the acoustical effects that you hear in this video are actually happen...

Background materials for an explanation of psychoacoustic codecs.

A primer on how to fill a fountain pen using bottled ink.

This video provides a basic description of how acoustic interference works, with an explanation of how this can result in a loudspeaker having different directivities at different frequencies.

A basic introduction to sound, including the concepts of pressure, frequency, sound pressure level, and some introductory information about loudspeakers. This is a video made a long time ago, that is now Part 5 in the series on Acoustics.

How to row a boat in Denmark

This is a quick demo of a Jinhao X750 fountain pen fitted with a Deleter Comic G dip pen nib.

A comparison of the voltage applied to a loudspeaker driver and its excursion. Note that this example uses very low frequencies - much lower than the resonant frequency of the driver (which is approximately 33 Hz according to its data sheet).

This video is about the movement of a loudspeaker diaphragm. The animations are for conceptual purposes only - nothing shown here is to scale.

A basic explanation and demonstration of normal modes on a string. Includes an explanation of amplitude and frequency, but does not include any math.

Harmonic Oscillator

Acoustic Destructive Interference

Acoustic Constructive Interference

Acoustic Reflection

Acoustic Radiation

Acoustic Diffraction

How to wrap a microphone cable