Sound samples of the measurment
Kopparbunken
Binaural microphones
Position one
Position two
Position three
ORTF microphones
Position one
Position two
Position three
Impressions about the Kopparbunken
The first impressions we had about the reverberation time and the audibillity agree with the recordings. The huge volume and the walls and floor's material create a long reverberation time (around 4 secondes) and a bad speech and music inteligibility since a lot of echoes can be heard.
One can say that using this kind of room for listening to music or doing a speech would be a bad idea acoustically.
Position effect:
As one can hear thanks to the recordings, the measurements differs in level with the 3 different positions. Indeed the position two and three are quite the same, whereas in the first one the sound level perceived is less important. That consideration is made with both types of microphone. This is due to the fact that in the 2 last positions, we were close to a wall, which means that the reflected sound came louder and quicker to the microphones. That makes the speech inteligibility better in the middle of the room than close to the wall.
ORTF vs Binaural
The sound recorded by the binaural microphone seems to be very close to our ears, the level is higher, and the background noise can be heard more intensively. Whereas the ORTF microphones give the impression that the speaker, or the music is located far away from the receiver, who is also less disturbed by the background noise.
That is why we usually link bianural microphone with earphones, and ORTF microphone with loudspeaker.