Real World

Underground Car Park

Information
Description: 
First Impulse Response recording in an underground car park. Has a slightly nice resonance in it from the metal pipes on the ceiling.
Capture Date: 
Fri, 28/03/2014
Source Sound: 
Balloon Pop
Source Sound Category: 
Balloon Pop
Microphone(s): 
Zoom H4n Stereo Mic
Rode NTG-2
Space Category: 
Chamber
Hall
Open Air
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)
10.016.052.262.601.942.151.901.560.860.60

Early Decay Time EDT (seconds)
0.510.511.281.281.411.281.150.890.380.25

Definition D50
0.750.830.240.300.440.610.630.740.880.92

Clarity C50 (dB)
4.726.95-4.99-3.63-1.131.992.394.548.7210.54

Clarity C80 (dB)
10.138.861.472.081.453.514.366.4611.4214.27


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Images
Photographs and Diagrams: 
Location
Address: 
Underground Carpark
1 Sweden Gate
Surrey Quays, LND SE16 7TG
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
www.twitter.com/chrisunderdown

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


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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
Attribution
Attribute this work to: 
www.openairlib.net

Gill Heads Mine

Information
Description: 
These Impulse Responses were recorded in a disused mine found near Trollers Gill called Gill Heads Mine. The mine was used to extract Lead and Fluorite and was closed down as recently as the 1980s. Impulse responses were recorded at two sites (labelled site 1 and site 2) inside the mine not more than 30 m from the entrance. For each site there are 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 two directional sound sources pointing in opposite directions in an attempt to better approximate an omni-directional source (IR-2).
Measurement Team: 
Andrew Chadwick
Simon Shelley
Capture Date: 
Tue, 09/07/2013
Source Sound: 
Swept Sine; 20 Hz - 22 kHz ; 30 Seconds
Source Sound Category: 
Swept sine (logarithmic)
Input: 
Genelec 8130A
Microphone(s): 
Soundfield ST450 kit
Generation Type: 
Real World
Analysis
Analysis Description: 
This is the W-channel of the B-format impulse response measured at Site 2 using the two-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)
2.292.011.331.120.880.710.640.550.470.32

Early Decay Time EDT (seconds)
1.450.941.071.200.940.680.560.430.300.17

Definition D50
0.430.710.750.440.460.750.810.890.930.98

Clarity C50 (dB)
-1.193.914.87-1.12-0.694.826.168.9911.4817.18

Clarity C80 (dB)
0.985.566.400.083.027.269.3612.8615.6122.62


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Images
Photographs and Diagrams: 
Location
Address: 
Gill Heads Mine
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net

Elveden Hall (Suffolk England)

Information
Description: 
Various rooms of Elveden Hall, captured in 2001 on Sony D10 DAT using pair of AKG 451s in XY, and starter's pistol. The Hall, formerly the private residence of the Maharajah Duleep Singh and then the first Lord Iveagh, had at the time of these recordings not been lived in for decades. Elveden Hall, which was enlarged to its present size by Lord Iveagh at the end of the 19th century, consists of three floors in two enormous wings flanking a dramatic Marble Hall (which has featured as a location in films such as Eyes Wide Shut and Tomb Raider). The IRs offered here are a small subset of dozens made throughout the entire building, attempting to document every accessible room and closet, as part of research in a collaboration between artists Matt Rogalsky and Chlöe Steele entitled PERFECT IMPERFECT.
Measurement Team: 
Matt Rogalsky
Capture Date: 
Mon, 01/01/2001
Source Sound: 
Starter's pistol
Source Sound Category: 
Other
Microphone(s): 
AKG451 pair, XY
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)
40.5122.688.103.584.264.113.912.991.741.16

Early Decay Time EDT (seconds)
0.380.382.303.454.224.223.842.811.530.89

Definition D50
0.880.890.320.100.140.100.120.220.350.55

Clarity C50 (dB)
8.509.20-3.23-9.43-7.97-9.57-8.77-5.51-2.590.93

Clarity C80 (dB)
12.2410.07-1.05-5.98-5.26-6.71-5.68-2.940.334.21


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Images
Photographs and Diagrams: 
One of the Maharajah Duleep Singh's rooms, Elveden Hall ground floor
Marble Hall, Elveden Hall
Aerial view of Elveden Hall
Location
Address: 
Elveden Hall SFK
United Kingdom
Attribution
Attribute this work to: 
Matt Rogalsky
Memory Device

Innocent Railway Tunnel

Information
Description: 
The innocent railway tunnel, or St Leonards Tunnel, is found just South East of the centre of Edinburgh, close to Arthur's Seat. It was built in 1831, and designed to accommodate two railway tracks. It is 517 m long and straight, with a semicircular cross-section that is 6 m wide and 4.5 m high. The tunnel was closed in 1968 when this section of the railway was dismantled. In 1981 it was reopened as a footpath and later a tarmac surface was applied the floor of the tunnel. It now is also used as a cycle path and is part of the national cycling network. The first measurement, labelled "middle", was made roughly in the middle of the tunnel, with a distance of 10 m between the loudspeaker and the microphone. A second set of impulse responses was then measured at the South East entrance of the tunnel, at 6 different positions relative to entrance - labelled "entrance" (a), (b), (c), (d), (e) and (f). For the second set the distance between the loudspeaker and microphone was 5 m. The transducer positions for each measurement are illustrated by the diagrams found in the "Images" tab. For each measurement there are 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). The impulse responses recorded near the tunnel entrance have been normalised with respect to each other, so that the relative sound levels between measurements has been preserved.
Measurement Team: 
Andrew Chadwick
Simon Shelley
Capture Date: 
Wed, 28/08/2013
Size: 
13000 m³
Source Sound: 
Swept Sine; 22 Hz - 22 kHz ; 15 Seconds
Source Sound Category: 
Swept sine (logarithmic)
Input: 
Genelec 8130A
Microphone(s): 
Soundfield ST450 kit
Generation Type: 
Real World
Analysis
Analysis Description: 
This is the W-channel of the B-format impulse response measured at position f using a single loudspeaker. 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)
5.284.885.354.883.722.821.961.310.890.48

Early Decay Time EDT (seconds)
0.944.263.622.861.581.190.680.300.300.17

Definition D50
0.380.350.370.310.480.570.820.940.920.98

Clarity C50 (dB)
-2.10-2.76-2.22-3.55-0.301.266.6612.1010.4016.91

Clarity C80 (dB)
5.18-0.86-0.871.013.164.308.4214.3913.9521.14


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Images
Photographs and Diagrams: 
Location
Address: 
The Innocent Railway Tunnel Edinburgh
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net

St. Patrick's Church, Patrington

Information
Description: 
St Patrick's Church in Patrington dates back to the medieval era and expresses the decorated design of English Gothic Churches of the early 14th century. It has a cruciform plan, with an external length of about 46 meters, a breadth of 27 meters and a height of 57.5 meters up to the very top of the central tower. These impulse responses were measured in the real world. 3 sets of measurements were recorded for 3 different source-reciever configurations (S1-R1, S2-R2 and S3-R3). The positions of these sources and receivers are described in the attached diagram.
Measurement Team: 
Aglaia Foteinou
Damian T. Murphy
Capture Date: 
Fri, 31/07/2009
Size: 
8000 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: 
Church
Generation Type: 
Real World
Analysis
Analysis Description: 
The W channel from Measurement 1 was 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)
4.941.921.611.801.831.861.651.391.060.74

Early Decay Time EDT (seconds)
2.251.741.491.742.131.741.361.100.590.33

Definition D50
0.170.350.430.190.300.430.590.690.820.92

Clarity C50 (dB)
-7.01-2.67-1.29-6.35-3.73-1.311.623.566.4910.33

Clarity C80 (dB)
-0.74-0.091.180.64-1.131.293.235.308.7113.14


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Images
Photographs and Diagrams: 
Location
Address: 
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net

Troller's Gill

Information
Description: 
Impulse responses measured around the limestone gorge known as Troller's Gill in the Yorkshire Dales. Site 1 is a wide V-shape valley with hills either side, found at the co-ordinates: 54.054264, -1.900317. Site 2 is a small U-shape valley (the limestone gauge itself) with steep cliffs either side, found at the co-ordinates: 54.052596, -1.896829. Finally, site 3 is the open area at the bottom of Troller's Gill, found at the co-ordinates: 54.051784, -1.896455. Diagramas describing each site can be found under the Images tab. For each site there are 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). In each case the soundfield microphone is pointed directly at the loudspeaker.
Measurement Team: 
Andrew Chadwick
Simon Shelley
Capture Date: 
Tue, 09/07/2013
Source Sound: 
Swept Sine; 22 Hz - 22 kHz ; 30-60 Seconds
Source Sound Category: 
Swept sine (logarithmic)
Input: 
Genelec 8130A
Microphone(s): 
Soundfield ST450 kit
Space Category: 
Open Air
Generation Type: 
Real World
Analysis
Analysis Description: 
This is the W-channel of the B-format impulse response measured at Site 2 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)
0.660.680.580.460.470.460.400.390.370.27

Early Decay Time EDT (seconds)
0.640.510.510.380.250.380.380.250.380.12

Definition D50
0.530.720.790.920.940.910.920.950.930.98

Clarity C50 (dB)
0.594.145.8510.6111.7210.1710.8313.0911.2018.16

Clarity C80 (dB)
7.339.3811.7314.1115.9314.5515.3517.3916.9725.35


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Location
Address: 
United Kingdom
Attribution
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www.openairlib.net

Koli National Park - Summer

Information
Description: 
Impulse Responses measured in the forest of Koli National Park in Finland during mid-summer. There was no snow on the ground at this time. Impulse responses were captured at four sites and were measured using a B-format Soundfield microphone. For each site there are 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: 
Wed, 17/07/2013
Source Sound: 
Swept Sine; 22 Hz - 22 kHz ; 120 Seconds
Source Sound Category: 
Swept sine (logarithmic)
Input: 
Genelec 8130A
Microphone(s): 
Soundfield ST450 kit
Space Category: 
Open Air
Generation Type: 
Real World
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)
0.500.460.230.242.101.670.950.540.370.23

Early Decay Time EDT (seconds)
0.480.360.230.100.100.100.100.100.100.10

Definition D50
0.670.900.991.000.990.980.980.980.991.00

Clarity C50 (dB)
3.079.4919.6327.0221.9717.9516.6518.1119.3824.88

Clarity C80 (dB)
16.6924.1025.9931.1124.1020.6019.7322.2624.1432.11


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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

Basement

Information
Description: 
My first attempt at creating an impulse. Basement is a wood shop, and has a nice sound. 9 positions. Shure SM57 and speaker were compensated for manually, so results may not be perfectly accurate, but it sounds all right to my ears. This is ORTF.
Capture Date: 
Sun, 30/06/2013
Source Sound: 
Swept Sine; 20Hz - 20 KHz; 12 seconds
Source Sound Category: 
Swept sine (logarithmic)
Microphone(s): 
Shure SM57
Space Category: 
Small Room
Generation Type: 
Real World
Analysis
Analysis Description: 
Position 1, Stereo
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)
1.181.081.160.570.560.550.550.510.842.97

Early Decay Time EDT (seconds)
0.770.510.260.380.380.380.380.380.380.13

Definition D50
0.650.750.940.830.890.870.860.880.910.97

Clarity C50 (dB)
2.704.7711.726.858.948.298.008.6610.1614.78

Clarity C80 (dB)
4.8010.0514.3411.5912.8910.8911.7512.7014.3315.17


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Location
Address: 
NY
United States
Attribution
Attribute this work to: 
www.openairlib.net

Koli National Park - Winter

Information
Description: 
Impulse Responses measured in the forest of Koli National Park in Finland during winter. 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 are 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
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
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