Computer Model

Tvísöngur Sound Sculpture, Iceland (Model)

Information
Description: 
Opened to the public in 2012 and situated in the mountains above Seydisfjordur, north east Iceland, Tvísöngur is a sound sculpture designed by German artist Lukas Kuhne. Constructed entirely of smooth unpainted concrete at 100mm thick throughout, it consists of five interconnected domes - nicknamed "Fa", "La", "Si", "Do" and "Mi" in order of decreasing size. Each dome’s distinct size produces an individual resonant frequency corresponding to a tone in traditional Icelandic five-part harmony. Rounded archway openings built into the walls of each dome allow visitors to enter the structure and experience the unique acoustical characteristics of the space. These arched openings also act as Helmholtz resonators, as wind blowing in off the cliffs rushes into and across the openings, the air within the structure resonates. Nicknamed the ‘singing concrete’, Tvísöngur was designed for several voices in order to preserve Iceland’s musical heritage, which was one of the first and now only surviving forms of improvised polyphonic chants in Europe. In collaboration with the artist Lukas Kühne, using ODEON acoustic simulation software, an acoustic model replica of the structure was built in order to visualise how sound propagates through the structure, investigate how certain frequencies are resonated by each individual dome, and produce simulated impulse responses to create auralizations. One source and one receiver was positioned centrally within each of the five domes at 1.5m in height. Those within the structure would most likely experience the acoustic conditions from a standing position as there is no seating, therefore a source/receiver height of 1.5m was most suitable. The only exception being dome 'Mi' which, due to its lower ceiling height, was lowered to 1.2m in order to be a satisfactory distance from wall boundaries in accordance with guidelines set out by ISO 3382. For each source, a receiver position was located in each of the remaining 4 domes. A total of 20 impulse responses were therefore rendered (5 sources x 4 receivers). Please see images 4, 5, 6 for more detailed source/receiver positioning. The HRTF's used for binaural impulse response rendering were from the ODEON database, Subject_021Res10deg (Algazi, 2001).
Measurement Team: 
Oliver McIntyre
Capture Date: 
Mon, 27/03/2017
Size: 
100.41 m³
Space Category: 
Chamber
Open Air
Generation Type: 
Computer Model
Analysis
Analysis Description: 
Source Position 1 (Dome "Fa"), Receiver Position 4 (Dome "Do"). Source Height: 1.5m. Receiver height: 1.5m. Source/Receiver Distance: 4.73m.
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)
2.172.142.142.141.931.731.661.380.820.72

Early Decay Time EDT (seconds)
2.492.492.752.492.361.981.981.471.080.95

Definition D50
0.040.100.150.190.140.210.210.270.390.50

Clarity C50 (dB)
-14.33-9.50-7.51-6.18-8.01-5.79-5.82-4.38-1.91-0.07

Clarity C80 (dB)
-7.46-5.08-6.62-3.41-5.06-3.22-2.55-0.742.053.61


Example Audio



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Images
Photographs and Diagrams: 
Location
Address: 
Tvísöngur, Seyðisfjörður, AL
Iceland
Attribution
Attribute this work to: 
Oliver McIntyre
AudioLab, Department of Electronic Engineering, University of York
www.olivermcintyre.co.uk
- - - - - - - - - - - - - - - -
Lukas Kühne
Tvísöngur Architect
www.lukaskuehne.com
- - - - - - - - - - - - - - - -
Images 1, 7, 8, 9 by Gudmundur Oddur Magnusson
Permission to use images provided by Lukas Kühne

Waveguide Web Example Audio

Information
Description: 
This page includes some example audio produced using the Waveguide Web algorithm, presented in support of the paper 'Modelling Sparsely Reflecting Outdoor Acoustic Scenes using the Waveguide Web'. Included here are the following examples as mentioned in the paper: (1) Scattering Delay Network and Waveguide Web simulations of a 9x7x4 m shoebox room; (2) Treeverb and Waveguide Web simulations of a forest environment formed of 25 trees; (3) An IR recorded in an urban courtyard and two Waveguide Web simulations of the same environment, one of which was generated with the inclusion of a totally absorptive `sky-node'.
Measurement Team: 
Francis Stevens
Generation Type: 
Computer Model
Analysis
Analysis Description: 
IR generated using the WGW algorithm with 25 trees
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)
0.230.150.170.210.330.330.340.370.380.39

Early Decay Time EDT (seconds)
0.410.670.670.670.540.540.410.280.280.28

Definition D50
0.880.540.580.580.830.840.900.920.930.94

Clarity C50 (dB)
8.480.711.461.457.007.089.6410.7311.5212.07

Clarity C80 (dB)
10.766.004.956.4811.7413.1915.0015.1716.2916.79


Example Audio



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Images
Photographs and Diagrams: 
The 25 tree layout used to generate the forest IR using both Treeverb and the WG
A three-node WGW system
A view of the Urban courtyard where the IR was recorded
Attribution
Attribute this work to: 
www.openairlib.net

St. Mary's Abbey Reconstruction

Information
Description: 
The abbey of St. Mary was mostly destroyed during the dissolution under the rule of Henry VIII and now only ruins remain. These ruins can be found in the Museum Gardens adjacent to the river Ouse in York city. Virtual models of this now derelict church were built using measurements taken from scaled plans and other sources of architectural evidence. Impulse responses were then created using ray-based room acoustic modelling software. Three different models of the church were used with increasing levels of detail in their geometric structure, referred to as Phase 1, Phase 2 and Phase 3. The work was carried out as part of a Bachelor of Engineering project at the Audiolab in the University of York.
Measurement Team: 
Steve Oxnard
Damian Murphy
Capture Date: 
Thu, 09/06/2011
Size: 
47000 m³
Space Category: 
Church
Generation Type: 
Computer Model
Analysis
Analysis Description: 
This is a mono impulse response measured using the Phase 2 model.
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)
16.7516.3816.1315.2013.7312.299.887.495.075.51

Early Decay Time EDT (seconds)
21.3020.6618.4917.7215.9314.149.915.822.621.46

Definition D50
0.000.000.000.010.020.050.040.140.350.55

Clarity C50 (dB)
-25.44-25.40-25.77-22.80-17.47-12.83-13.53-8.01-2.760.79

Clarity C80 (dB)
-23.51-22.95-20.96-20.57-16.92-12.57-13.02-7.63-2.371.26


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

St. Patrick's Church, Patrington - Model

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. The impulse responses were generated using a ray-tracing model. 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: 
Sun, 09/10/2011
Size: 
8078 m³
Space Category: 
Church
Generation Type: 
Computer Model
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)
1.811.801.781.861.791.851.631.380.980.70

Early Decay Time EDT (seconds)
2.081.952.081.951.821.951.691.310.920.67

Definition D50
0.170.320.290.440.400.370.430.570.670.79

Clarity C50 (dB)
-6.95-3.28-3.85-1.11-1.74-2.37-1.171.263.025.64

Clarity C80 (dB)
-1.24-0.94-1.540.51-0.77-0.680.322.994.727.83


Example Audio



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Images
Photographs and Diagrams: 
Location
Address: 
St. Patrick's
Rectory Northside Patrington
Hull HU12 0PA
United Kingdom
Attribution
Attribute this work to: 
www.openairlib.net
Audiolab, University of York
Dr. Damian T. Murphy
Aglaia Foteinou

Virtual Membranes

Information
Description: 
This is a small collection of impulse responses generated using a computer simulation of stretched 2-D membranes, such as a drum skin. There are three different membrane shapes: Shape A, Shape B and Shape C. Shape A is a circular membrane and Shape B is a circular membrane with a section removed resulting in a Pacman character shape. Finally Shape C is in the shape of a nuclear weapon symbol. Shapes B and C are interesting examples because they are computer models of membranes with shapes that would be extremely difficult to realise in the real world. Images of the membranes can be seen in the Photographs and Diagrams section. The membranes were modelled using the FDTD method, using sampling rate 192 kHZ.
Measurement Team: 
Simon Shelley
Capture Date: 
Mon, 27/03/2006
Size: 
1 m³
Source Sound: 
low-pass filtered impulse
Source Sound Category: 
Impulse
Space Category: 
Membrane
Generation Type: 
Computer Model
Analysis
Analysis Description: 
This is the output from the circular membrane.
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)
1.372.132.621.581.531.521.561.531.571.53

Early Decay Time EDT (seconds)
4.344.473.452.942.942.942.942.942.943.06

Definition D50
0.020.060.150.160.160.160.160.170.190.17

Clarity C50 (dB)
-18.07-12.11-7.58-7.15-7.19-7.18-7.27-6.97-6.29-6.82

Clarity C80 (dB)
-13.32-10.77-5.41-4.93-4.93-4.88-4.84-4.86-4.27-4.83


Example Audio



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Images
Photographs and Diagrams: 
Attribution
Attribute this work to: 
www.openairlib.net
Audiolab, University of York
Simon Shelley
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