Frequently asked questions

How does it work?

The Noise Compass uses a correlation technique to calculate the direction of the dominant noise source. A-weighting is applied, so the measured A-weighted LAeq level will be pointed to by the compass.

Can i see several sources with the Noise Compass?

No. Only the dominant noise source will be presented. However, if source levels are comparable, the quality indicator will inform you. A quality level of 1 means that we have a very high SNR, while a lower quality level (say 0.5) indicates that multiple sources contributes to the direction. The output direction will then be the average of the sources.

How sure can I be that the direction is correct?

The Noise Compass has a quality indicator that informs you about the uncertainty. A low quality level means that the measured sound direction has a diffuse field charactheristic, or that two sources is measured at about equal SPL. A high quality level indicates that the sources is uniqly defined with high SNR.

Can I use the Noise Compass inside?

Yes, but be aware that the Noise Compass also picks up reflections. It will be hard to determine directions with high quality levels in a reflective environment.

What is the resolution?

The angular resolution is not limited, but the uncertainty described in the specifications apply.

What are the sector limitations in NorCloud?

Any sector can be defined as a combination of horizontal and vertical angle. The number of sectors is unlimited, and may also overlap.

What is a typical application of the Noise Compass?

When combined with a Norsonic Nor145 or Nor150 and NorCloud, the Noise Compass will allow you to mark and separate parts of the measurement that comes from your defined directions. A typicall application is a construction site with a road or railway nearby. Define a sector covering the railway/road, and the measurement will be marked when the noise comes from that direction.