Real World

Perth City Hall

Information
Description: 
Perth City Hall is a prominently-sited civic building beside the A-listed St John’s Kirk, and within Perth’s former market place. It was listed category B on 26 August 1977 and is within the Perth Central Conservation Area. It has been redundant since 2005. The memorial stone was laid by Lord Provost Cuthbert in 1909 and the design exhibited at the Royal Scottish Academy in 1912. The architects, appointed after competition, were H. E. Clifford and Thomas Lunan. Clifford was one of a generation of Glasgow-based architects influenced by the architecture of the Ecole des Beaux-Arts in Paris, and this is reflected in the building’s architectural style. It has coupled giant Ionic columns and sculptural enrichments, while the interior has a galleried large main hall and a correspondingly classical character. (Historic Scotland)
Measurement Team: 
Nick Green
Capture Date: 
Tue, 19/05/2015
Source Sound: 
Balloon pop
Source Sound Category: 
Balloon Pop
Input: 
Balloon Pop
Microphone(s): 
Alesis Palmtrack Portable recorder
Space Category: 
Concert 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)
20.7011.873.653.703.543.202.812.261.609.77

Early Decay Time EDT (seconds)
2.491.983.133.133.003.002.752.111.340.83

Definition D50
0.370.250.130.210.290.280.220.280.490.70

Clarity C50 (dB)
-2.31-4.79-8.44-5.87-3.85-4.08-5.45-4.07-0.113.73

Clarity C80 (dB)
0.040.67-4.66-4.32-2.43-2.55-3.72-2.141.595.75


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Images
Photographs and Diagrams: 
Perth City Hall
Perth City Hall
Perth City Hall
Location
Address: 
Perth City Hall
King Edward Street
PH1 5UG
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
Nick Green

Abernyte Grain Silo

Information
Description: 
A concrete structure standing approximately 20m in height by by 5m in diameter the silo proved to have a fantastic reverberation quality close to 6 seconds from initial impulse to the sound dying away. Opportunist recording of balloon burst IR captured using an Alesis Palmtrack portbale recorder. Having passed this disused grain silo on the way to Errol brickworks I made a mental note to stop and explore on the way home. The silo probably a structure from the 60's or 70's is a typical cylindrical building but with a flat roof.
Measurement Team: 
Nick Green
Capture Date: 
Wed, 08/04/2015
Source Sound: 
Balloon pop
Source Sound Category: 
Balloon Pop
Input: 
Balloon pop
Microphone(s): 
Alesis Palmtrack internal microphones
Space Category: 
Chamber
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)
10.8811.519.867.936.084.563.482.581.601.57

Early Decay Time EDT (seconds)
6.2412.518.297.525.864.583.552.530.990.35

Definition D50
0.090.110.060.050.230.310.290.410.760.90

Clarity C50 (dB)
-10.21-8.94-11.58-12.58-5.30-3.52-3.79-1.505.079.78

Clarity C80 (dB)
-7.22-7.26-9.95-11.11-4.28-3.09-3.12-0.995.4210.21


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Images
Photographs and Diagrams: 
Abernyte grain silo
Internal view of Abernyte grain silo
Location
Address: 
Abernyte garin silo PKN
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
Nick Green

Errol Brickworks, Errol, Perth and Kinross

Information
Description: 
Errol Brickworks situated on the outskirts of Errol Village, Perth and Kinross is now a Mackies potato crisps factory but two kilns remain. The works dates to 1870 and remained active until the mid nineties. The structure of the kilns looked like large brick built yurts, with the external walls below the dome strapped in metal casing. The internal dimensions are 6.5m to the height of the dome form the centre of the floor by 5.8m in diameter. Mackies staff allowed access to one of the kilns on the day of our visit. Two techniques were employed, a sine sweep recording using Apple's Impulse Response Utility software and a balloon pop recorded using a portable Alesis Palmtrack. Initially the reverberation characteristic appeared to be unremarkable having very little decay time, however upon wondering around inside the kiln a pronounced pre-delay was evident. Whilst standing close to the opposite wall from the entrance noise made by Paul near the entrance appeared to reverberate around the outside wall creating an effect similar to the whispering gallery found in the dome of St Paul's Cathedral in London, all be it more subtle.
Measurement Team: 
Dr Paul Oliver
Nick Green
Capture Date: 
Wed, 08/04/2015
Source Sound: 
Balloon pop and 20Hz - 20KHz sine sweep
Source Sound Category: 
Balloon Pop
Input: 
Balloon pop and sine sweep
Microphone(s): 
MM1 omni-directional reference microphones
Alesis Palmtrack internal microphones
Space Category: 
Chamber
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)
0.740.560.440.340.300.340.340.350.330.29

Early Decay Time EDT (seconds)
0.600.730.600.600.600.220.350.350.220.22

Definition D50
0.510.450.700.690.830.930.900.910.940.96

Clarity C50 (dB)
0.11-0.883.723.486.8011.319.7510.0811.7714.21

Clarity C80 (dB)
8.60-0.135.064.199.2314.1513.3813.9516.1119.14


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Images
Photographs and Diagrams: 
Errol Brickworks, domed kiln
Errol Brickworks, domed kiln
Interior of domed kiln stereographic view
Location
Address: 
Inchcoonans brickworks
Errol
Perth, PKN
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
Dr Paul Oliver and Nick Green

Kinoull Aisle, Perth

Information
Description: 
IR field recording trip Kinoull Aisle, Perth. A 16th century chapel on the site of one of the oldest known churches in Perth. The Aisle houses a monument to the Earl of Kinoull, Lord Chancellor Hay, an impressive stone sculpture nearly 6 metres in height. Thanks to the monument and the recessed windows and door the chapel has a smooth linear reverberation characteristic approximately 2 seconds long.
Measurement Team: 
Nick Green
Dr Paul Oliver
Capture Date: 
Wed, 01/04/2015
Size: 
161 m³
Source Sound: 
Balloon Pop
Source Sound Category: 
Balloon Pop
Microphone(s): 
Marantz PMD661 portable recorders internal microphones
Space Category: 
Church
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)
6.072.632.342.252.352.041.771.411.030.83

Early Decay Time EDT (seconds)
2.031.392.292.292.672.161.771.521.130.75

Definition D50
0.100.250.210.130.210.350.330.350.470.66

Clarity C50 (dB)
-9.42-4.72-5.78-8.18-5.82-2.75-3.09-2.69-0.512.83

Clarity C80 (dB)
-3.942.04-3.99-4.96-4.05-0.46-0.800.622.446.18


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Images
Photographs and Diagrams: 
Kinoull Aisle
Lord Chancellor Hay's monument
Location
Address: 
Kinoull Aisle and Burial Ground
Dundee Road
Perth, PKN
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
Nick Green and Dr Paul Oliver

Central Hall, University of York

Information
Description: 
These Impulse Responses were recorded in the Central Hall venue of the University of York. The space is primarily used for lectures and conferences; to emulate this scenario; a sound source was placed centered on the stage of the venue while six different microphone positions were chosen to sample the acoustics of the space. As can be seen in the images, the microphone placements were chosen by dividing Central Hall into four audience areas: the stalls on the floor in the centre of the space (Stalls), the central block of seating (positions 3C, 3L), the block to the left of the stage (positions 3C, 3L), and a single position just above the entrance to the Hall and below stairs (diagonal block of seating (2L)). Position 2L was chosen at a non-chair position, because of potential interesting filtering effects of the stairs above the receiver as well as due to the lack of chairs below it. The rear of the stage had a projection screen lowered that was 1.4 m from the source, as would have been the case during the simulated scenario. The microphone in the central region (Stalls) was placed in front of the speaker, 5.1 m from the source. All microphone positions were 1.2 m above the floor at seat positions while the source was positioned at 1.5 m above stage level (both in compliance with ISO 3382-1:2009). The soundfield microphone orientation was always chosen to be orthogonal to the line of seats, facing the centre of the space.
Measurement Team: 
Alexander Vilkaitis
Ilias Antonopoulos
Joska De Langen
Xaun Liu
Capture Date: 
Sat, 07/02/2015
Size: 
8000 m³
Source Sound: 
Swept Sine, 20Hz - 20kHz; 15 Seconds
Source Sound Category: 
Swept sine (logarithmic)
Input: 
Genelec
Microphone(s): 
Soundfield
Space Category: 
Auditorium
Hall
Generation Type: 
Real World
Analysis
Analysis Description: 
This demonstration impulse response was captured in the centre of the centre block of seating, directly in front of the source.
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)
2.671.581.421.071.111.121.030.860.631.95

Early Decay Time EDT (seconds)
1.541.541.671.411.281.411.411.161.030.64

Definition D50
0.110.320.300.440.330.190.200.240.440.72

Clarity C50 (dB)
-9.17-3.18-3.67-0.97-3.14-6.30-6.13-4.95-1.044.01

Clarity C80 (dB)
-5.680.69-1.770.35-1.15-2.39-2.88-2.371.277.54


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Images
Photographs and Diagrams: 
Centre Stalls Receiver Position - 5.1m from Source
3C Receiver Position - Third row of central block of seating
3L Receiver Position - Centre of central block of seating
2L Receiver Position - Diagonal block of seating
General overview of Central Hall
Showing three blocks of seating. Block 3 (Far left), Block 2 (Diagonal in Foregr
Plan of Central Hall Including Source and Receiver Positions
Location
Address: 
Central Hall
University Road University Of York
York, NYK YO10 5DD
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
Alexander Vilkaitis
Ilias Antonopoulos
Joska De Langen
Xuan Liu

Heslington Church (VAA Group 2)

Information
Description: 
Heslington Church (St. Paul’s) is a Methodist church situated on land where a church has been present since the 11th century. By the mid 19th century the building was considered too small and the material was in poor state. This led to the construction of what makes up the modern church on this site. When new housing estates and the university were built nearby, the church was once again considered too small and extensive extensions and alterations were made to the building in 1973. Of special note in these most recent alterations is the conversion of the chancel to a side-chapel, and the moving of the high altar to a large nave on the main space's side wall. The end result was the complete reorientation of the church from the traditional lengthways layout to an unusual 'landscape' orientation, with the congregation facing the nave on the side wall. [1] The reorientation of the space was a main reason we chose this location for our acoustic measurements. The unusual position of the priest's speaking position relative to the congregation could give interesting results (especially for speech intelligibility) in a space originally acoustically designed for a more traditional church layout. The loudspeaker was set up in the nave just in front of the altar at standing head height. The first five receiver positions were situated in the middle of the front row of each set of pews at seated head height, allowing for measurements of speech intelligibility from typical listener positions in the new orientation of the church. A sixth receiver was positioned in the central rear section of the church, providing impulse responses intended for creative musical use. The seventh receiver position was in the corner of the room, in order to capture all of the modes of vibration present in the space. [1] Heslington Church. “History”, https://sites.google.com/site/heslingtonchurch/home. [Online]. Available: https://sites.google.com/site/heslingtonchurch/history [Accessed: Feb. 26, 2015]
Measurement Team: 
Marc Ciufo Green
Michael James Lovedee-Turner
Yuchen Gong
Capture Date: 
Thu, 19/02/2015
Size: 
2000 m³
Source Sound: 
Swept Sine; 20Hz - 22kHz ; 15 Seconds.
Source Sound Category: 
Swept sine (logarithmic)
Input: 
Genelec 8030
Microphone(s): 
Soundfield ST450
Space Category: 
Church
Generation Type: 
Real World
Analysis
Analysis Description: 
This impulse response was taken from the middle rear section of the church. Receiver Position: 905 cm from right wall, 101 cm from rear wall, 160 cm High. Source Position: 1,134 cm from right wall 353 cm from front wall 157 cm high. Temperature: 13°C. Humidity: 52%.
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)
3.731.281.401.591.751.651.491.140.860.59

Early Decay Time EDT (seconds)
1.381.251.121.761.891.631.631.250.990.61

Definition D50
0.180.560.390.250.410.450.310.430.510.78

Clarity C50 (dB)
-6.511.09-2.03-4.70-1.53-0.80-3.51-1.140.115.40

Clarity C80 (dB)
-2.623.341.56-2.201.511.18-0.291.593.549.34


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Images
Photographs and Diagrams: 
Location
Address: 
Heslington Church, Heslington, York
School Lane
York YO10 5EE
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
University of York AudioLab
Marc Ciufo Green
Michael Lovedee-Turner
Yuchen Gong

Railroad tunnel - Purnode's Tunnel

Information
Description: 
IR collected in a 80 meters railway tunnel. 48K-32bit-stereo
Measurement Team: 
Valvalion
Capture Date: 
Fri, 19/12/2014
Source Sound: 
balloon
Source Sound Category: 
Balloon Pop
Microphone(s): 
Zoom H2N
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)
9.284.911.902.001.421.150.730.610.602.30

Early Decay Time EDT (seconds)
7.672.422.161.390.630.630.630.500.500.37

Definition D50
0.020.180.190.340.790.810.740.790.850.89

Clarity C50 (dB)
-16.15-6.46-6.23-2.955.886.224.575.857.409.18

Clarity C80 (dB)
-14.30-2.74-3.820.808.798.668.8110.1711.5913.31


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Images
Photographs and Diagrams: 
Location
Address: 
Purnode's tunnel
Belgium
Attribution
Attribute this work to: 
http://dreferd.tumblr.com/
http://dreferdblog.tumblr.com/
www.openairlib.net

Spokane Woman's Club

Information
Description: 
The Spokane Woman's Club hall is a highly reflective space with bare walls, a hardwood floor and a curved ceiling. The space is roughly 84'x42' with an average ceiling height of about 16'. The sweep was recorded before an event and deconvolved with Voxengo's Deconvolver. The IR turned out very well. It allowed for seamless transition between the room sound recorded during a number of events, and the IR reverb used during post-production.
Measurement Team: 
James Cadwallader
Capture Date: 
Wed, 07/12/2011
Size: 
1600 m³
Source Sound: 
Swept Sine; 20 Hz - 22 kHz ; 10 Seconds
Source Sound Category: 
Swept sine (logarithmic)
Input: 
JBL Eon G1
Microphone(s): 
Rode NT4 Stereo X/Y Condenser
Space Category: 
Auditorium
Ballroom
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)
2.441.871.882.142.522.552.161.610.880.65

Early Decay Time EDT (seconds)
1.461.331.331.721.841.841.721.460.560.44

Definition D50
0.370.140.300.490.560.550.380.410.820.89

Clarity C50 (dB)
-2.34-7.75-3.61-0.151.050.90-2.08-1.616.729.03

Clarity C80 (dB)
0.010.283.723.042.282.370.020.799.1712.58


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Images
Photographs and Diagrams: 
Location
Address: 
Spokane Woman's Club
1428 W 9th Ave
Spokane, WA 99204
United States
Attribution
Attribute this work to: 
www.openairlib.net
James Cadwallader

Cafeteria Universidad San Buenaventura Bogotá

Information
Description: 
The central cafeteria of Universidad San Buenaventura in Bogotá is the place were more than 200 students share a common space to have lunch, meal or just study. There was a problem, it was extremely noisy. The measured background noise was about 69dB (A) and it was required to propose an acoustical solution. There were 2 receiver positions for each of the 2 source positions, 3 repetitions each. The generated sound was a log sine sweep from 20Hz to 20kHz at an averaged sound pressure level of 100dB (A) in order to assure at least a 30dB signal to noise ratio. Distances, locations and levels were determined according the ISO 3382 standard. An acoustical model was predicted in EASE software and it was used to evaluate different kinds of solutions.
Measurement Team: 
Leandro Rodiño
Santiago Rayes
Leandro Berón
Capture Date: 
Wed, 15/08/2012
Size: 
1335 m³
Source Sound: 
Log Sine Sweep; 20Hz - 20kHz; 10 Seconds
Source Sound Category: 
Swept sine (logarithmic)
Input: 
Omnidirectional Source with Subwoofer
Microphone(s): 
Behringer ECM 8000
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)
1.241.732.380.891.501.401.771.570.810.89

Early Decay Time EDT (seconds)
1.411.542.051.661.791.791.791.791.411.15

Definition D50
0.460.570.260.190.380.290.310.410.490.69

Clarity C50 (dB)
-0.741.19-4.45-6.30-2.17-3.97-3.40-1.65-0.213.57

Clarity C80 (dB)
1.082.51-2.31-2.770.890.170.372.493.717.66


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Images
Photographs and Diagrams: 
Location
Address: 
Cafeteria Universidad San Buenaventura Bogotá Bogotá
Colombia
Attribution
Attribute this work to: 
http://www.usbbog.edu.co
http://www.untref.edu.ar

WNIU Studio Untreated

Information
Description: 
WNIU Studio, basic construction with no acoustic treatment, bare concrete floor. Balloon break, 3' from Earthworks M30. Both balloon and mic at 4.5' off floor.
Measurement Team: 
Jim Addie
Capture Date: 
Thu, 15/05/2014
Source Sound: 
Balloon break at 3' from mic
Source Sound Category: 
Balloon Pop
Microphone(s): 
Earthworks M30
Space Category: 
Recording Studio
Generation Type: 
Real World
Location
Address: 
WNIU
801 North 1st Street
DeKalb, IL 60115
United States
Attribution
Attribute this work to: 
James Addie
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