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geoff martin
Registrace 31. 03. 2007
Gramophone Speed Governor
The drivetrain of my Telefunken Lido, showing the operation of the speed governor.
For a full description of the project, start here:
www.tonmeister.ca/wordpress/2020/10/02/telefunken-lido-repair-day-1/
For a full description of the project, start here:
www.tonmeister.ca/wordpress/2020/10/02/telefunken-lido-repair-day-1/
zhlédnutí: 4 504
Video
6. Introduction to acoustics: Reflections
zhlédnutí 23KPřed 4 lety
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...
4. Introduction to Acoustics: Stereo Imaging
zhlédnutí 58KPřed 4 lety
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...
3. Introduction to Acoustics: Speed of Sound
zhlédnutí 11KPřed 4 lety
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...
2. Introduction to Room Acoustics: Room Modes
zhlédnutí 47KPřed 4 lety
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...
1: Introduction to Room Acoustics
zhlédnutí 82KPřed 4 lety
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...
codec demo
zhlédnutí 1,7KPřed 6 lety
Background materials for an explanation of psychoacoustic codecs.
Fountain Pen Filling Systems
zhlédnutí 911Před 6 lety
A primer on how to fill a fountain pen using bottled ink.
Introduction to Acoustic Interference and Loudspeaker Directivity
zhlédnutí 20KPřed 7 lety
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.
5. Basics of Sound
zhlédnutí 16KPřed 7 lety
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.
Jinhao X750 modified with Deleter Comic G nib
zhlédnutí 1,2KPřed 7 lety
This is a quick demo of a Jinhao X750 fountain pen fitted with a Deleter Comic G dip pen nib.
Loudspeaker: Input vs Output
zhlédnutí 2,7KPřed 8 lety
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).
Loudspeaker Diaphragm Movement
zhlédnutí 2,8KPřed 8 lety
This video is about the movement of a loudspeaker diaphragm. The animations are for conceptual purposes only - nothing shown here is to scale.
Modes on a String
zhlédnutí 136KPřed 8 lety
A basic explanation and demonstration of normal modes on a string. Includes an explanation of amplitude and frequency, but does not include any math.