Alcuin College, University of York

Information

Description: 
Impulse responses recorded in a semi enclosed courtyard in Alcuin College on the University of York campus. The courtyard is formed of six buildings, with a 2.4m high wall connecting the buildings. Receivers S1R1, S1R2, and S1R3 sit at different distances forming an axis from source position S1. This axis was chosen as it is roughly parallel to the faces of the buildings to the north and south of the courtyard. Receivers S2R1, S2R2, and S2R3 form an axis from source S2 in order to approximate the diagonal span of the courtyard (limited by line of sight due to minor obstacles in the courtyard). These sets of receiver positions were chosen to compare the acoustic properties of a direct sound path orthogonal to the surrounding geometry with those of sound path at an oblique angle. S3R1 is positioned out of the line of sight of source S3, with acoustic coupling provided by the glass frontage of the north eastern building. Position S4 was inside a ground floor room adjacent to position S3. For positions S1R1 - S3R1 three impulse responses have been made; one with a single directional sound source (indicated by 'front' in the filename), one using a starter pistol (indicated by 'spist', and the other with an array of four directional sound sources pointing in different directions in an attempt to better approximate an omni-directional source. For positions S4R1-S4R2 only a single speakerorientation has been used due to the loudspeaker being inside a room. In each case the soundfield microphone is pointed directly at the loudspeaker.
Measurement Team: 
Francis Stevens
Simon Shelley
Capture Date: 
Fri, 16/08/2013
Size: 
21000 m³
Source Sound: 
Swept Sine; 22 Hz - 22 kHz ; 60 seconds
Source Sound Category: 
Swept sine (logarithmic)
Input: 
Genelec S30D louspeaker, Starter Pistol
Microphone(s): 
Sound Field ST450 B-format microphone
Space Category: 
Open Air
Generation Type: 
Real World

Analysis

Analysis Description: 
This is the W channel of the B-format impulse response measured at position S1R1 using the combination of four loudspeaker orientations.
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)
1.992.221.991.491.611.831.771.521.200.90

Early Decay Time EDT (seconds)
2.152.151.511.891.891.891.891.511.510.23

Definition D50
0.140.410.460.320.470.610.340.610.650.92

Clarity C50 (dB)
-7.93-1.58-0.74-3.35-0.451.96-2.841.982.6110.53

Clarity C80 (dB)
-4.86-0.131.04-1.860.442.48-1.583.673.7411.50


Example Audio



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Impulse Responses

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

Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 16
Duration: 3.45 s
File Size: 2.53 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 16
Duration: 3.08 s
File Size: 2.26 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 16
Duration: 2.93 s
File Size: 2.15 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 16
Duration: 2.96 s
File Size: 2.17 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 44.1 kHz
Number of Channels: 2
Bits per Sample: 16
Duration: 3.02 s
File Size: 2.21 MB
File Format: mp1


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 16
Duration: 3.6 s
File Size: 2.64 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 16
Duration: 2.61 s
File Size: 1.91 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 16
Duration: 2.46 s
File Size: 1.8 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 24
Duration: 5 s
File Size: 5.49 MB
File Format: wav


Sample Rate: 96 kHz
Number of Channels: 4
Bits per Sample: 16
Duration: 2.24 s
File Size: 1.64 MB
File Format: wav

Images

Photographs and Diagrams: 
Birdeseye view of the site, indicating source and receiver positons
View of source position S1 from receiver S1R1
Receiver Position S1R2
Receiver Position S2R1
Source Position S4

Location

Address: 
Alcuin College, University Of York
Heslington
York, NYK YO10 5DD
United Kingdom
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Attribution

Attribute this work to: 
www.openairlib.net