Real World

Koli National Park

Information
Description: 
Impulse Responses measured in the forest of Koli National Park in Finland during early spring. The ground was covered in snow between 50 cm and 70 cm. Impulse responses were captured at four sites and were measured using a B-format Soundfield microphone. For each site there two sets of impulse responses: One is made with a single directional sound source (IR-1), and the other is made with an array of four directional sound sources pointing in different directions in an attempt to better approximate an omni-directional source (IR-2).
Measurement Team: 
Andrew Chadwick
Simon Shelley
Capture Date: 
Thu, 28/03/2013
Source Sound: 
Swept Sine; 22 Hz - 22 kHz ; 30 Seconds
Source Sound Category: 
Swept sine (logarithmic)
Input: 
Genelec 8130A
Microphone(s): 
Soundfield ST450 kit
Space Category: 
Open Air
Generation Type: 
Real World
Related Links: 
Information about the park
Analysis
Analysis Description: 
This is the W-channel of the B-format impulse response measured at Site 1 using the four-way loudspeaker array. The file has been truncated and processed by fading out the signal when the reverb tail reaches the noise floor.
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)
0.160.180.070.181.061.500.970.440.330.22

Early Decay Time EDT (seconds)
0.470.350.220.090.090.090.090.090.090.09

Definition D50
0.540.891.001.001.000.980.960.991.001.00

Clarity C50 (dB)
0.748.9438.7732.8026.4516.1614.2121.7523.0728.41

Clarity C80 (dB)
10.6518.6842.6534.9729.1919.5617.8326.0928.1535.46


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Images
Photographs and Diagrams: 
Location
Address: 
Koli National Park
Ylä-kolintie 39
Koli 83960
Finland
Attribution
Attribute this work to: 
www.openairlib.net
Audio Lab, University of York
Andrew Chadwick
Simon Shelley

Domestic Living Room

Information
Description: 
Domestic living room, recorded in front of speaker, at the back of the room, and in the adjacent room. Cutoff at 16kHz due to hardware constraints.
Source Sound: 
30 second sine sweep 20hz - 22 kHz
Source Sound Category: 
Swept sine (logarithmic)
Input: 
Tube Hifi
Microphone(s): 
Sony Walkman
Space Category: 
Small Room
Generation Type: 
Real World
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)
0.000.270.350.270.240.200.180.200.180.14

Early Decay Time EDT (seconds)
5.120.380.260.130.130.130.130.130.130.13

Definition D50
0.410.910.981.001.001.001.001.001.001.00

Clarity C50 (dB)
-1.5510.2817.8423.6426.6329.9231.1727.3428.9033.14

Clarity C80 (dB)
1.0918.5423.0927.0531.7835.4636.8533.5136.0241.16


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Stairway, University of York

Information
Description: 
This stereo impulse response was recorded in a stairway found in the Electronics Department at the University of York
Measurement Team: 
Simon Shelley
Capture Date: 
Tue, 13/07/2010
Source Sound: 
Swept Sine; 20 Hz - 22 kHz; 15 Seconds; 96kHz
Source Sound Category: 
Swept sine (logarithmic)
Input: 
Genelec S30D
Microphone(s): 
Neumann KM 140 Cardioid
Space Category: 
Hall
Generation Type: 
Real World
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)
1.041.671.081.051.231.080.900.920.750.52

Early Decay Time EDT (seconds)
0.730.730.470.600.730.730.600.600.600.35

Definition D50
0.250.800.770.810.680.760.790.790.770.91

Clarity C50 (dB)
-4.805.945.316.343.274.955.875.705.1910.16

Clarity C80 (dB)
1.297.0611.619.376.357.879.018.488.7314.65


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Images
Photographs and Diagrams: 
Location
Address: 
Department of Electronics, University Of York
Heslington
York YO10 5DD
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
Audiolab, University of York
Simon Shelley

St. Margaret's Church - National Centre for Early Music

Information
Description: 
Impulse responses were captured in St. Margaret's Church in York. The space has since been redeveloped and is now used for concerts and conferences, and for this reason its acoustics have been extensively redesigned by ARUP Acoustics. Using different configurations at the panel absorbers (reflective on the one side, absorbing on the other) as well as drapes in the roof the acoustic behaviour can be changed. The first cofiguration, for musical/opera performances, includes drapes and 75% of panels in use (open). For the second configuration, the drapes and 100% of the panels are in use, suitable for lectures/speech. For the third configuration, suitable for music recitals, only the drapes are in use (all panel absorbers closed). Photographs show the configurations being used. Receiver positions were chosen in order to create a virtual grid of 26 points equidistant from each other in the audience area. The source was placed as a performer would be in the space. The positions of these sources and receivers are described in the attached diagram. -----NOTE: The Impulse Responses have been updated on 22nd March 2012. For more information please contact with Aglaia Foteinou (af539@ohm.york.ac.uk)
Measurement Team: 
Aglaia Foteinou (af539@ohm.york.ac.uk)
Simon Shelley
Capture Date: 
Tue, 03/05/2011
Size: 
3600 m³
Source Sound: 
Swept Sine; 20 Hz - 22 kHz; 15 Seconds; 96kHz
Source Sound Category: 
Swept sine (logarithmic)
Input: 
Genelec S30D
Microphone(s): 
Soundfield SPS422B Microphone
Space Category: 
Church
Generation Type: 
Real World
Related Links: 
The National Centre for Early Music
Analysis
Analysis Description: 
This is an omnidirectional impulse response (w-channel of the B-Format files) recorded from the 17th receiver position of the 1st configuration using a Soundfield SPS422B Microphone.
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)
21.002.691.821.601.491.401.301.150.810.52

Early Decay Time EDT (seconds)
2.392.131.621.871.621.491.361.110.590.47

Definition D50
0.060.220.410.220.370.370.430.460.710.85

Clarity C50 (dB)
-12.22-5.48-1.58-5.38-2.29-2.22-1.22-0.783.807.44

Clarity C80 (dB)
-3.16-3.53-0.03-1.41-0.580.531.523.207.9112.48


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Images
Photographs and Diagrams: 
Videos
Video: 
Video Description: 
A walkthrough animation has been created where the viewer moves through a virtual space rendered using 3D CAD techniques, listening to the sound produced from a musical source place within it. The video was produced using a CAD model in 3DS Max in which a camera path guides the viewer through the virtual space. For the accompanying audio, two different auralization techniques were used. First, B-format impulse responses were measured in-situ, across 26 different receiver positions with the source at the virtual performer position. The second auralization was based on a geometric acoustic model of the same space with equivalent source and receiver positions. For the walkthrough simulation, receiver positions are selected based on the camera path trajectory. Anechoic material was convolved with the corresponding receiver position B-format impulse responses obtained from both the measurements and the computer model. Postproduction and B-format decoding was carried out in Nuendo 5.5, crossfading between both receiver positions (for the walkthrough) and the auralization methods (allowing a comparison to be made).
Location
Address: 
The National Centre for Early Music
St Margaret's Church, Walmgate
York York YO1 9TL
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
Audiolab, University of York
Aglaia Foteinou
Simon Shelley

Terry's Typing Room

Information
Description: 
These Impulse Responses were measured in the partitioned typing room inside the Terry's chocolate and confectionery factory in York. The factory was closed in 2005 and the site is planned for redevelopment.
Measurement Team: 
Dr. Damian T. Murphy
Capture Date: 
Sun, 03/12/2006
Size: 
3500 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: 
Hall
Generation Type: 
Real World
Related Links: 
Planning for Terry's site
Analysis
Analysis Description: 
This is an omnidirectional impulse response recorded using a Soundfield SPS422B Microphone.
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)
1.931.601.622.232.982.802.161.590.850.57

Early Decay Time EDT (seconds)
1.401.010.881.652.162.041.271.010.630.24

Definition D50
0.090.430.510.430.480.430.670.700.760.92

Clarity C50 (dB)
-10.05-1.190.13-1.27-0.35-1.313.133.665.0210.82

Clarity C80 (dB)
-1.743.143.232.310.82-0.024.105.718.4114.29


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Images
Photographs and Diagrams: 
Location
Address: 
The Chocolate Works
Bishopthorpe Road
York YO23 1DE
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
Audiolab, University of York
Dr. Damian T. Murphy

Falkland Palace Bottle Dungeon

Information
Description: 
An Impulse Response recorded in the bottle dungeon found in Falkland Palace.
Measurement Team: 
Dr. Damian T. Murphy
Capture Date: 
Tue, 24/03/2009
Source Sound: 
Balloon Pop
Input: 
A balloon pop.
Microphone(s): 
Soundfield SPS422B Microphone
Space Category: 
Chamber
Generation Type: 
Real World
Related Links: 
Falkland Palace National Trust Page
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)
2.632.552.092.161.601.110.770.630.410.30

Early Decay Time EDT (seconds)
0.652.571.421.811.171.040.780.650.400.27

Definition D50
0.360.230.440.390.560.570.690.710.860.94

Clarity C50 (dB)
-2.43-5.13-1.09-2.030.961.233.493.817.8112.01

Clarity C80 (dB)
7.52-3.361.450.893.093.366.147.3712.4018.40


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Images
Photographs and Diagrams: 
Location
Address: 
Falkland Palace & Garden KY15 7BU
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
Audiolab, University of York
Dr. Damian T. Murphy

Tyndall Bruce Monument

Information
Description: 
This monument was created for Onesipherous Tyndall Bruce in Falkland.
Measurement Team: 
Dr. Damian T. Murphy
Capture Date: 
Tue, 24/03/2009
Size: 
40 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
Related Links: 
Photograph of the monument on Geograph
Analysis
Analysis Description: 
This is an omnidirectional impulse response recorded using a Soundfield SPS422B Microphone.
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)
12.8513.003.612.271.741.401.080.810.460.25

Early Decay Time EDT (seconds)
2.412.921.771.131.001.000.490.110.110.11

Definition D50
0.140.370.530.580.710.780.890.970.981.00

Clarity C50 (dB)
-7.98-2.380.481.373.975.608.9014.4417.1824.32

Clarity C80 (dB)
-1.200.041.432.334.496.2110.0316.1621.6930.82


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Images
Photographs and Diagrams: 
Location
Address: 
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
Audiolab, University of York
Dr. Damian T. Murphy

Falkland Palace Royal Tennis Court

Information
Description: 
These impulse responses were recorded in a tennis court with no roof. The court is designed for Real Tennis, or Caitch and can be found at Falkland Palace in Fife. It was originally built for King James V of Scotland and construction began in 1539.
Measurement Team: 
Dr. Damian T. Murphy
Capture Date: 
Tue, 24/03/2009
Size: 
2300 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: 
Hall
Open Air
Sports Hall
Generation Type: 
Real World
Related Links: 
Website Devoted to the Tennis Court
Falkland Palace National Trust Page
Analysis
Analysis Description: 
This is an omnidirectional impulse response recorded using a Soundfield SPS422B Microphone.
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)
9.244.965.195.616.415.482.161.090.740.52

Early Decay Time EDT (seconds)
1.901.901.511.261.391.261.000.620.490.23

Definition D50
0.010.440.570.470.460.700.740.710.810.92

Clarity C50 (dB)
-22.00-1.131.18-0.54-0.623.624.483.966.1810.69

Clarity C80 (dB)
-18.71-0.643.244.062.204.686.669.4710.2814.57


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Images
Photographs and Diagrams: 
Location
Address: 
Falkland Palace & Garden KY15 7BU
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
Audiolab, University of York
Dr. Damian T. Murphy

Terry's Factory Warehouse

Information
Description: 
These Impulse Responses were measured in a large empty warehouse inside the Terry's chocolate and confectory factory in York. The factory was closed in 2005 and the site is planned for redevelopment.
Measurement Team: 
Dr. Damian T. Murphy
Capture Date: 
Sun, 22/10/2006
Size: 
4500 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: 
Hall
Generation Type: 
Real World
Related Links: 
Planning for Terry's site
Analysis
Analysis Description: 
This is an omnidirectional impulse response recorded using a Soundfield SPS422B Microphone.
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)
88.6469.6066.818.1910.2210.528.096.052.939.74

Early Decay Time EDT (seconds)
4.164.673.776.467.877.495.823.521.600.57

Definition D50
0.050.130.120.150.170.210.320.440.630.85

Clarity C50 (dB)
-12.50-8.33-8.84-7.47-7.01-5.80-3.27-0.982.337.55

Clarity C80 (dB)
-4.84-3.65-6.20-5.16-4.60-2.50-1.260.784.099.50


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Images
Photographs and Diagrams: 
Location
Address: 
The Chocolate Works
Bishopthorpe Road
York YO23 1DE
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
Audiolab, University of York
Dr. Damian T. Murphy

R1 Nuclear Reactor Hall

Information
Description: 
Built in 1954, the R1 Nuclear Reactor has not been used since 1970. However, the reactor hall still remains. It is found 25 metres underneath the KTH Royal Institute of Technology, near to Stolkholm.
Measurement Team: 
Damian T. Murphy
Capture Date: 
Tue, 07/11/2006
Size: 
3500 m³
Source Sound: 
Swept Sine; 20 Hz - 22 kHz; 15 Seconds
Source Sound Category: 
Swept sine (logarithmic)
Space Category: 
Hall
Generation Type: 
Real World
Related Links: 
Panoramic Photograph of Site
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)
6.985.454.495.155.434.783.602.511.450.98

Early Decay Time EDT (seconds)
6.155.123.844.354.354.102.821.921.030.51

Definition D50
0.020.110.130.170.220.240.400.500.590.79

Clarity C50 (dB)
-17.33-9.15-8.29-6.82-5.61-4.93-1.73-0.031.535.76

Clarity C80 (dB)
-15.65-7.04-4.51-1.40-3.53-3.24-0.012.065.0711.22


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Images
Photographs and Diagrams: 
Location
Address: 
KTH Royal Institute of Technology
Valhallavägen 79
Stockholm 114 27
Sweden
Attribution
Attribute this work to: 
www.openairlib.net
Audiolab, University of York
Dr. Damian T. Murphy
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