EVP AUDIO LAB
Review session audio, isolate a moment, and export a clean share pack
The EVP Audio Lab is where you review the audio recorded alongside a session. It lays the sound out as a waveform and a spectrogram so you can find, isolate, and export the moments that matter.
THE TOOLS
| Tool | What it does |
|---|---|
| Waveform | The full clip as amplitude over time. Click and drag to mark a region. |
| Spectrogram | Frequency content over time, useful for spotting speech-like bands. |
| Spectrum | A live frequency snapshot at the playhead. |
| EQ | Shape the playback to pull a faint sound forward. |
MARKING A REGION
Drag across the waveform to set an in point and an out point. The live range readout shows both timecodes. Playback loops the selected region so you can listen closely.
LIVE PLAYBACK METERS & TIMECODE
To support detailed review of potential evidence, the EVP Audio Lab includes several live realtime playback meters designed to visualize and verify sound patterns:
- Spectrogram waterfall: Displays high-resolution frequency intensity rolling over time, making it easier to notice anomalies.
- Waveform with moving playhead: Displays the full clip amplitude over time with an active, moving playhead indicating the exact position.
- Spectrum bars: Shows frequency snapshot levels mapped dynamically across distinct volume bands.
- Level meter: Tracks overall audio amplitudes to help you analyze precise acoustic peaks.
Investigators can toggle the prominent SHOW TIMECODE banner to display a running timecode readout (formatted as HH:MM:SS:FF for hours, minutes, seconds, and frames) overlaid on the playback stream.
PER-EVENT CAMERA CYCLING & THUMBNAILS
When an audio event is linked to a visual capture, you can analyze the environmental surroundings using dual source controls directly within the EVP interface:
- Per-event camera cycling: Click the previous or next controls to cycle through all cameras attached to a specific detection event to inspect other viewing angles.
- Thumbnail-source selector: Choose which visual feed is shown in the preview window. The available sources include:
- RGB: Standard color camera stream.
- depth: Standard false-color or mono depth visualization.
- depth-grey: High-contrast grayscale depth mode.
- thermal: Heat-signature visual feed.
- IP camera: Connected network camera stream.
EXPORT SNIPPET
Once you have a region marked, Export Snippet bundles it into a tidy share pack for review or hand-off. A single export produces:
- A trimmed WAV and MP3 of just the selected region, with a gentle fade so there is no click at the edges.
- Matching still images pulled from the session around that moment.
- A caption stub with the in and out timecodes and a blank line for what was heard.
- A waveform PNG of the clip.
- An optional audiogram MP4 video.
The audiogram has two layouts:
| Layout | Look |
|---|---|
| Full frame | The matching still fills the frame with the animated waveform glowing across the bottom. |
| Split panel | The still sits on top with the waveform in a clean panel below. |