Maes Howe

Information

Description: 
Maes-Howe, Orkney, is one of the finest chambered cairns in Europe, and is dated to 3000BC. Prior work in the acoustics of ancient sites explores how the resonances exhibited therein might have affected regular human ritual and interaction with the space. It has been hypothesized that as these resonances are within the lower male vocal range, they may have been used in ritual to accentuate aspects of the voice. Unlike many similar ancient structures that have been studied to date, Maes Howe lends itself to the presence of strong modal frequencies. It is almost cubic in shape, of dimension 4.6m, with walls made from large, flat slabs of stone, resulting in smooth reflecting surfaces rather than more commonly found irregular placement of smaller stones.
Measurement Team: 
Dr. Damian T. Murphy
Capture Date: 
Fri, 10/12/2004
Size: 
100 m³
Source Sound: 
Log. Swept Sine; 20-22k Hz; 15s long
Source Sound Category: 
Swept sine (logarithmic)
Input: 
Genelec S30D
Microphone(s): 
Neumann KM 140 Cardioid
Soundfield SPS422B Microphone
Space Category: 
Chamber
Generation Type: 
Real World

Analysis

Analysis Description: 
The w channel of the b-format recording is used for analysis.
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)
0.780.840.760.640.580.510.470.430.350.29

Early Decay Time EDT (seconds)
0.750.750.620.370.240.240.240.110.110.11

Definition D50
0.160.620.770.890.930.920.960.990.991.00

Clarity C50 (dB)
-7.322.225.139.2811.1810.7814.2518.5620.3924.81

Clarity C80 (dB)
3.036.038.6512.2415.2515.4818.3822.8425.5331.01


Example Audio



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Impulse Responses

Format(s): 
Stereo (Stereo Files)
B-Format (4 Channel Files)
Stereo: 

Sample Rate: 48 kHz
Number of Channels: 2
Bits per Sample: 24
Duration: 1 s
File Size: 281.29 KB
File Format: wav
Source Sound: Genelec S30D, 15 second log. sine sweep
Microphone: Neumann KM 140 Cardioid
Source Location: Centre of chamber
Microphone Location: Centre of wall opposite entrance
Source Receiver Distance (m): 2 m
Source Height: 1.5 m
Receiver Height: 1.5 m
Temperature: 10 °C

B-Format: Multichannel: 

Sample Rate: 48 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 1 s
File Size: 562.62 KB
File Format: wav
Source Sound: Genelec S30D, 15 second log. sine sweep
Microphone: Soundfield SPS422B
Source Location: Centre of chamber
Microphone Location: Centre of wall opposite entrance
Source Receiver Distance (m): 2 m
Source Height: 1.5 m
Receiver Height: 1.5 m
Temperature: 10 °C

Images

Photographs and Diagrams: 
Maes Howe
Maes Howe
Maes Howe
Maes Howe

Location

Address: 
Maeshowe Stromness, ORK
United Kingdom
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Attribution

Attribute this work to: 
www.openairlib.net
Audiolab, University of York
Damian T. Murphy