FAQ NoiseCapture


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Answer
  • Measure with the telephone by hand (the measurement continues even after the phone switches to standby)
  • Use walking preferably
  • When you perceive that the sound environment will change (for example, you switch from a park to a boulevard), stop the current measure and start a new one
  • There is no minimum duration, but the longer the duration is the better the exploitation; the interesting is to have measurements on a trip where the sound environment is about "homogeneous"
  • Do not hesitate to go back in the same areas, at other times of the day, at other time period of the week/year
  • Avoid measurements with strong rain or wind (or consider selecting the corresponding Tags)
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Everyone can use it. Nevertheless, its use is rather intended for an audience with a certain technical (or sensitivity) in the field of acoustic measurement.

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  • Each person using the application becomes a contributor if he wishes
  • The set of contributions is aggregated to build a map
  • To view the map and extract information, go to the following page (from a computer)
  • Zoom into areas containing measurements
  • Select colored hexagons to display information about the collected measurements.
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At this stage, the presented map is based only on the raw data collected (without filtering, without processing). The objective is to collect sufficient data to produce, in a second stage, maps that are "relevant from the point of view of an acoustician", by developing new methodologies. These maps will be uploaded later. To be informed of the evolution of the project, follow us on Twitter:

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  • Recent work has focused on this subject. The last results show that the quality of smartphones is improving continuously and that such a device can be used for this type of application
  • Obviously, it is best to calibrate the smartphone by comparison with a reference device (see the "Calibration" menu of the application)!
  • To improve the measurement, you can use an external microphone, which you can calibrate with the application using a calibrator (if compatible)
  • Realize a measurement with the phone in hand, on foot, and, if possible, without adding noise!
  • Even without calibration, the information transmitted is of interest for our research!
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  • Because you may need a "pocket sound level meter"
  • Because you can use it in your educational activities
  • Because you want to characterize your sound environment
  • Because you want to contribute to collaborative noise maps
  • Because you want to participate in a scientific project
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Since this is an Open Science approach, there are many ways to contribute to this project:

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Data are distributed under the OdBL license (see the data page). As long as you stick to this license, you are free to use the data. If you have specific needs (access to data flows for a city, specific processing, integration of NoiseCapture code into another application...), the easiest way is to contact us at contact@noise-planet.org

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The file is minimized. For a measurement of 2 minutes, the size of the file is of the order of 24ko.