Virtual Membranes

Information

Description: 
This is a small collection of impulse responses generated using a computer simulation of stretched 2-D membranes, such as a drum skin. There are three different membrane shapes: Shape A, Shape B and Shape C. Shape A is a circular membrane and Shape B is a circular membrane with a section removed resulting in a Pacman character shape. Finally Shape C is in the shape of a nuclear weapon symbol. Shapes B and C are interesting examples because they are computer models of membranes with shapes that would be extremely difficult to realise in the real world. Images of the membranes can be seen in the Photographs and Diagrams section. The membranes were modelled using the FDTD method, using sampling rate 192 kHZ.
Measurement Team: 
Simon Shelley
Capture Date: 
Mon, 27/03/2006
Size: 
1 m³
Source Sound: 
low-pass filtered impulse
Source Sound Category: 
Impulse
Space Category: 
Membrane
Generation Type: 
Computer Model

Analysis

Analysis Description: 
This is the output from the circular membrane.
Demonstration Impulse Response: 

Waveform

impulseClick here or on the waveform to upload a sound from your computer and hear it in this space

Acoustic Parameters


Octave Band
31.25 Hz62.5 Hz125 Hz250 Hz500 Hz1 kHz2 kHz4 kHz8 kHz16 kHz

Reverberation Time RT60 T30 (seconds)
1.372.132.621.581.531.521.561.531.571.53

Early Decay Time EDT (seconds)
4.344.473.452.942.942.942.942.942.943.06

Definition D50
0.020.060.150.160.160.160.160.170.190.17

Clarity C50 (dB)
-18.07-12.11-7.58-7.15-7.19-7.18-7.27-6.97-6.29-6.82

Clarity C80 (dB)
-13.32-10.77-5.41-4.93-4.93-4.88-4.84-4.86-4.27-4.83


Example Audio



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Impulse Responses

Format(s): 
Mono
Mono: 

Sample Rate: 192 kHz
Number of Channels: 1
Bits per Sample: 16
Duration: 0.92 s
File Size: 344.57 KB
File Format: wav


Sample Rate: 192 kHz
Number of Channels: 1
Bits per Sample: 16
Duration: 1 s
File Size: 375.04 KB
File Format: wav


Sample Rate: 192 kHz
Number of Channels: 1
Bits per Sample: 16
Duration: 0.92 s
File Size: 344.57 KB
File Format: wav

Images

Photographs and Diagrams: 
Virtual Membranes
Virtual Membranes
Virtual Membranes
Virtual Membranes
Virtual Membranes
Virtual Membranes
Virtual Membranes
Virtual Membranes
Virtual Membranes
Virtual Membranes
Virtual Membranes

Attribution

Attribute this work to: 
www.openairlib.net
Audiolab, University of York
Simon Shelley