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Explosion Detector
HOME > REMORAS > EXPLOSION DETECTOR
The explosion detector is based on a cross-correlation of the recording with a template explosion. The detector divides the recording into sections of 75 s, which are analyzed sequentially. The output of the detector is a series of .mat files, that can be read into GPLReview to evaluate. The detector needs audio files with a sample rate of 12 kHz, so decimation of the original wave file is required if the sample rate is higher than this.
Learn how to download or clone the Triton repository with the Explosion Detector Remora repository and how to add the Remora to Triton in the quick setup section.
- In the control window of Triton, go to Remoras and select Explosion Detector: Run Explosion Detector from the drop-down menu.
- Fill in the path to the audio files in the box called "Audio Base Directory".
- If the audio files are located in one or more subfolders of the folder that is referred to in Audio Base Directory, check the box Search Sub-Folders.
- Fill in the path to the output folder in the box called Output Folder.
- Select the type of data to be analyzed. For XWAV files, select “HARP”. For WAV files, select “Sound Trap”.
- If required, change the parameter settings.
- Hit "Run Detector".
The default settings of the parameters generally work well for most explosive sounds. The following parameters are used by the Explosion Detector:
- Threshold Offset: Offset that is added to the median square of correlation coefficient to calculate the threshold.
- Minimum Time Distance (s): minimum time distance between consecutive explosions. Explosions that are within this time interval of the previous explosion will not be detected.
- Noise Samples: number of noise samples before and after the signal to be pulled out.
- RMS Noise Before Signal (dB): Threshold for the minimum difference in root-mean-square sound pressure level between the signal and the time before the detection. Detections with a difference smaller than this value will be eliminated.
- RMS Noise After Signal (dB): Threshold for the minimum difference in root-mean-square sound pressure level between the signal and the time after the detection. Detections with a difference smaller than this value will be eliminated.
- PP Noise Before Signal (dB): Threshold for the minimum difference in peak-to-peak sound pressure level between the signal and the time before the detection. Detections with a difference smaller than this value will be eliminated.
- PP Noise After Signal (dB): Threshold for the minimum difference in peak-to-peak sound pressure level between the signal and the time after the detection. Detections with a difference smaller than this value will be eliminated.
- Maximum Explosion Duration (s): Durations that are longer than this value will be eliminated.
- Minimum Explosion Duration (s): Durations that are shorter than this value will be eliminated.