Estimating absorption of materials to match room model against existing room using a genetic algoritthm
In room acoustic refurbishment/renovation projects, it is common to create a digital room model for use in room acoustic prediction software such as ODEON. Before simulating changes it is desirable to match the model, as well as possible, to existing conditions so that measured room acoustics parameters are in fair agreement with the ones simulated […]
Measurement and Simulation of high sound insulation and identification of sound transmission paths in complex building geometries
Prediction and measurement of high sound insulation and evaluation of sound transmission paths in complex building structures can be a difficult and challenging task. This paper reports on measurements and simulations in the Odeon software of airborne sound insulation between premises in neighbouring buildings, from the basement in one building to the 3rd floor in […]
New Norwegian standard on the acoustics of rooms for music rehearsal and performance
A new Norwegian standard NS 8178 has been established with the aim to improve the facilities used for music; especially in relation to music teaching and rehearsing of non-professional ensembles it is found that the rooms are often very unsatisfactory in terms of the acoustics. The standard specifies recommended dimensions and reverberation times for various […]
Acoustics in the multipurpose halls of the new main library and the new Munch musem in Oslo
This paper will introduce you to two very different multipurpose halls planned in two new buildings in Oslo; The new main library (the Deichman library) drawn by Lund Hagem architects and the new museum for the Norwegian painter Edvard Munch drawn by estudio Herreros architects, both planned to be opened in 2019. The two buildings […]
Applying In-situ Recalibration For Sound Strength Measurements in Auditoria
The measurement of the Sound Strength (G) room acoustic parameter requires a calibration of the measuring system, so either the sound power of the source or the sound pressure level at a distance of 10 m in free field is known. Two procedures are described in ISO 3382-1: Calibration in a reverberation chamber and calibration […]
The acoustics of places for social gatherings (keynote)
A well-known but also very complicated problem in room acoustics is the ambient noise when many people are gathered for a reception or in a restaurant, a bar, a canteen or a similar place. In such social gatherings people want to speak with each other, but for the same reason the place can be very […]
Discretization of curved surfaces and choice of simulation parameters in acoustic modeling of religious spaces
A common characteristic of religious spaces in Eastern and Western Mediterranean cultures is the existence of large curved surfaces, usually in form of domes at the ceiling. Modeling of such spaces using geometrical acoustic algorithms typically requires discretisation of curved surfaces into planar elements. The degree of discretisation plays a crucial role in the quality […]
Detection of Colouration in Rooms by use of Cepstrum Technique
Colouration is an unwanted effect in rooms for speech and music. While very easy to hear when present, it is difficult to measure objectively. Examples of colouration problems include orchestra stages with suspended overhead reflectors, meeting rooms and talks studios with parallel hard walls. While colouration can easily be detected by listening, it is difficult […]
Calibration of auralisation presentations through loudspeakers
The correct level of presentation is important for all kinds of auralisation in order to be as realistic as possible. The method applied in ODEON is approximate, aiming at the A-weighted sound pressure level to match that of the calculation result of the same simulation. A pink noise signal is applied for the calibration. The […]
Retrieving complex surface impedances from statistical absorption coefficients
In room acoustic simulations, surface materials are commonly represented by energy parameters such as absorption and scattering coefficients, which do not carry phase information. This paper presents a method for transforming statistical absorption coefficients into complex surface impedances, which are required for phased or time-domain calculation methods. An impedance model based on fractional calculus is […]
