ARC på NRK P2 for å snakke om stillhet

Sist lørdag tok programmet Ekko Helg på NRK P2 opp temaet stillhet. Som gjest hadde de filosof Kaja Melsom og vår egen Odd Pettersen. Både de filosofiske og de akustiske sidene av hva støy og stillhet gjør med oss ble dermed diskutert.

Du kan høre diskusjonen på NRKs nettsider, opptil seks måneder etter sending.

Bilde fra Microsoft Clip Art

App basert på lydteknologi fra SINTEF kan gi bedre hørsel

De tre norske gründerne Snorre Vevstad, Ralph Bernstein og Jørgen Myrland i Listen AS er i ferd med å lansere en ny hørselsapp. Appen er laget av SINTEF Akustikk og basert på vår erfaring innen hørselsteknologi og høreapparater.

I dag koster det mange tusen kroner å få et høreapparat, og det kan ta 6-18 måneder å få et godt tilpasset apparat gjennom det offentlige systemet. Listen AS ønsker å snu opp ned på dette markedet, med raskere og billigere tilgang til hørselshjelpemidler. På verdensbasis er det kun 10 % av de som trenger et høreapparat som har tilgang til det.

Appen har tre hovedkomponenter:

  • Hørselstest
  • Sanntidsprosessering av lydsignalet basert på resultater av hørselstesten
  • Fjernhjelptjeneste

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Program of the 39th Scandinavian Symposium on Physical Acoustics

The 39th Scandinavian Symposium on Physical Acoustics will be held at Geilo Hotel from January 31st to February 3rd, 2016, and is organised by Ulf Kristiansen and Erlend Magnus Viggen at ARC. This year, there are 50 registered participants who will be holding a total of 32 talks on various topics such as sound propagation, ultrasonics, sonar technology, acoustics in solids, petroleum-related acoustics, and more. You can find the entire conference program below, and a printable version can be downloaded here.

Read more…Program of the 39th Scandinavian Symposium on Physical Acoustics

Presenting the MAUS project on traffic auralisation

In the MAUS project, we have developed a prototype of a traffic auralisation tool. The idea is to realistically imitate the sound of traffic, to give an idea of how it will sound in cases that have not been realised yet, and to show the effects of various noise-reducing measures. We have previously given a simple description of how the tool works together with sound examples on this blog.

In early December, we presented a paper and a poster on the MAUS auralisation tool at the 18th International Conference on Digital Audio Effects (DAFx-15) here in Trondheim. This conference was organized by the Music Technology and Acoustics groups at NTNU.

Read more…Presenting the MAUS project on traffic auralisation

Project: Next Step

Noise induced hearing loss (NIHL) is one of the most common occupational diseases. This is a fact even if most countries have legislations specifying how much sound employees can be exposed to. Therefore new models for NIHL seem to be necessary to reduce the risk of developing hearing disorders.

In the Norwegian petroleum industry much attention has been paid to occupational noise and hearing damage in the last decade. Statoil ASA has, in collaboration with Honeywell, been involved in several projects at SINTEF with this in mind. The current ongoing project is called Next Step (Noise Exposure Tackled Safely Through Ear Protection).

Read more…Project: Next Step

Hvor kommer lyden fra?

Lukk øynene dine og hør på lydene rundt deg. Kan du høre hvor de kommer fra? Hvilken retning, og hvor langt unna lydkilden er? Hørselen vår er et eksepsjonelt instrument som ikke bare har et stort dynamisk område, men også evnen til å lokalisere lydkilder. Vi kan faktisk oppfatte retningen til en lydkilde med en nøyaktighet ned mot én grad. Denne evnen er i stor grad mulig fordi vi ikke bare har ett øre – men to! Dette gjør at vi klarer ganske så godt å skille lyder vi er interessert i, typisk tale og musikk, fra uønsket lyd som kommer fra andre retninger.

Read more…Hvor kommer lyden fra?

A brief history of electroacoustics, pt. 9:
Horns: Cinema sound and large scale sound reproduction

The 1920s saw much development in horn loudspeakers, and loudspeaker in general. Western Electric already had their microphones, amplifiers, straight exponential horns, and very good balanced armature transducers. At this time, much research was also put into disc recording and reproduction at the Western Electric Engineering Department, and simultaneously, optical recording of sound was also in progress, using Wente’s Light Valve. The time seemed ripe to attempt sound film. The story has been told elsewhere, but in short, most of the industry turned down Western Electric’s offer. They “knew” sound film would not work. But the Warner Bros found in the WE system something that could help them beat the big guys in the industry, and after the success of their first sound film, the rest is history.

Read more…A brief history of electroacoustics, pt. 9:
Horns: Cinema sound and large scale sound reproduction

A brief history of electroacoustics, pt. 8:
Horns: Early development

It is hard to tell when horns first were used. They have been in use for thousands of years as instruments, and man must early have discovered the amplifying effect of a pair of cupped hands in front of his mouth, or behind his ears. Ear trumpets were early implementations of this, and the first hearing aids.

Horns were used on phonographs and gramophones from the start. This was the only way to get the required volume from the tiny motions of the needle. The theoretical understanding of horns was still small though, and most of the work was experimental. Early models used conical horns, but as theory progressed, the superiority of the exponential horn was recognized.

Read more…A brief history of electroacoustics, pt. 8:
Horns: Early development

Tolerance for aircraft noise remains unchanged

The annoyance response of different communities to aircraft noise has always been difficult to predict. However, in recent years, many studies report extremely high levels of annoyance for the given noise exposure levels. This has led to the belief that people are nowadays less tolerant to aircraft noise than they were a few decades ago.

We’ve looked at the results of 57 aircraft noise surveys conducted between 1961 and 2015, and found that people’s tolerance to aircraft noise hasn’t changed at all.

Read more…Tolerance for aircraft noise remains unchanged

Invitation to the 39th Scandinavian Symposium on Physical Acoustics

The 39th Scandinavian Symposium on Physical Acoustics will be held at Geilo Hotel from January 31 to February 3, 2016. This year it is organised by Ulf Kristiansen and Erlend Viggen, both at ARC. The theme for the meeting will as usual be physical acoustics, with emphasis on hydroacoustics, nonlinear acoustics, ultrasound, general sound propagation and applications in technology, medicine and fisheries.

The purpose of these meetings is primarily to stimulate contacts and exchange information between different Scandinavian teams working in this research area. Although the symposium is Scandinavian, foreign participants are most welcome, and the meeting language will be English. As usual, we expect a rather informal tone, the main goal being to create contacts, not only during sessions, but also by social activities, indoors and outdoors (cross country and downhill skiing). The meeting normally attracts about 50 participants holding about 25 talks throughout 5 sessions.

Read more…Invitation to the 39th Scandinavian Symposium on Physical Acoustics