Audio Surveillance

Many video surveillance cameras support a microphone (in-built, with the option for an external unit) and support external speakers. Audio adds value to surveillance content, in specific cases and provided it is of a quality that can be comprehended.
How effective are the audio components of a video surveillance camera, and what are the use-cases for deploying the audio-input and audio-output features of a video surveillance camera. This brief looks at the standards, the effectiveness, and use-cases with respect to the audio components of a video surveillance solution.
The objective behind supporting speakers is to send an audio warning using the camera, thus having a deterrent effect on potential law-breakers captured on camera. The audio warning may sent by the person monitoring the video feed, or may a recorded sound that is automatically transmitted whenever an alert is raised by the video analytics module. Either human monitoring or a video analytics application is a prerequisite for implementing the speakers feature on video surveillance cameras.