Audio adds a critical dimension to surveillance by enabling detection of sound-based events and improving situational awareness. This paper explains how microphones can capture sounds such as shouting, glass breaking, or distress signals, triggering alerts or directing cameras toward the source. Audio can be used with or without recording, helping address privacy considerations depending on regulations. The paper also covers microphone placement, acoustic challenges, gain settings, and integration with analytics at the edge, server, or cloud. Combined with video, audio enhances real-time response, improves investigation capabilities, and provides valuable context for understanding incidents.

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