AMBIsense

Data formats

Within the AMBIsense solution, measurements of the 1/3-octave band spectrum are performed. The results of these measurements can be exported in multiple formats:

• as a self-explanatory CSV table;
• as one of the following very simple, yet efficient proprietary binary formats:
  • a phen1 file: a very restrictive format that keeps small datasets as small as possible, while maintaining random access on row level;
  • an ABT file: a binary table format with fast and efficient random access (both on row and column level).

Instant measurements

The AMBIsense sensors can be configured to send instant measurements to a dedicated MQTT broker. These have the following structure:

• audio measurements (8 messages / s):
  • topic: /instant/<deviceName>/measurements
  • payload, in msgpack:
    • timestamp: float
    • dBA: float (sound level)
• classifications (frequency depends on the model):
  • topic: /instant/<deviceName>/classification/<modelId>/<modelVersion>
  • payload, in msgpack:
    • timestamp: float
    • confidences: float[] for each class