21  Sound Detection

Sound detection uses the built-in microphone to trigger recording when abnormal audio or intense sounds are detected near the camera. Ensure that the camera is not near constant background noise that will trigger audio detection and create false alerts.
Sound Detection is compatible with certain Lorex IP cameras. For a complete list of compatible cameras, navigate to your recorder series at .

21.1  Configuring Sound Detection

Make sure you already have the camera audio enabled on the main and sub-stream of the channel you are configuring, see 27 Connecting Audio Devices for details.
    To configure sound detection:
  1. From the Live View display, right-click to open the Quick Menu, then click Main Menu.
  2. Click Events, then Event Settings. Click the Sound Detection tab from the side panel.
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  3. Select a channel with a compatible camera.
  4. Check Audio Abnormal to trigger the system when the audio has stopped working, or check Intensity Change to trigger the system when the sound intensity exceeds the sensitivity and threshold levels
  5. Adjust your audio detection settings:
    • Sensitivity: Adjust the sensitivity bar to increase or decrease the amount of sound required to trigger an event above the threshold. Sensitivity is a finer setting than the threshold setting.
    • Threshold: Adjust the threshold bar to determine how loud a sound must be to trigger an audio detection event.
  6. Click Set next to Schedule to choose which days and times of the week to enable sound detection:
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    • Click or click-and-drag along each of the purple timelines to quickly add or remove time from each day’s schedule in 30–minute segments.
    • Click icon beside 2 or more days to link schedules (icon ). This allows you to quickly change multiple schedules at once.
    • To make fine adjustments to a schedule, click icon . This will allow you to set exact start and end times for a schedule.
    • Click OK when finished.
  7. Choose how the system will react to sound detection:
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    • Alarm Out: Select the external alarm output devices that will be activated when motion is detected. Set the length of time the alarm output device will be activated for following a motion detection event in the Latch field.
    • Record Channel: Select the channels that will record when abnormal or intense sounds are detected on the selected channel. Set the length of recording following a sound detection event in the Post_REC field.
    • Send Email: Check to enable email alerts. You must configure email alerts before you will be able to receive them (see 19.6.3 Configuring Email Alerts, page 90).
    • PTZ Activation: Set connected PTZ cameras to start a tour, pattern, or go to a preset location.
    • Sequence: Sequence mode will begin. Select the numbered tiles next to this option to include the corresponding channels in the sequence.
    • Snapshot: Select the numbered tiles next to this option to save a snapshot of the corresponding channels.
    • Buzzer: Check to enable the system buzzer.
  8. Click Apply to save changes.