Network camera video surveillance systems have become an indispensable part of urban security infrastructure. Video surveillance deployments are widely implemented across many cities. For network cameras, users may pair them with standard megapixel lenses, high-definition megapixel lenses, or 3MP HD lenses. For the same camera model, lens resolution is the decisive factor governing image quality. Nevertheless, audio also plays a vital role in video surveillance. Below, technicians from Kaimorui walk you through troubleshooting steps when a network camera produces no sound.

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Troubleshooting Causes for No Audio

1. First, confirm whether the camera’s audio input is set to LINE IN (line level). If using the LINE audio input port, verify that the audio pickup device has stable power supply and check whether the pickup wiring is correct.
2. Check the wiring for the audio signal output from the sound pickup device. Typically, the audio input connector on a network camera is a 3.5 mm jack, so the audio signal cable from the pickup device must be adapted to match this 3.5 mm jack. Note that 3.5 mm jacks come in dual-channel (stereo) and single-channel (mono) variants. Confirm which type your 3.5 mm jack is. For mono configurations: the positive wire of the pickup connects to the positive terminal of the 3.5 mm jack, and the negative wire connects to the negative terminal. For dual-channel configurations: the jack has three conductors. The pickup’s negative wire connects to the jack’s negative terminal, while the positive wire connects to the other two conductors for the left and right channels respectively.
3. Some brands of network cameras support both LINE and MIC input on one shared audio port. In such cases, the left channel may be assigned for LINE input and the right channel for MIC input. Under this setup, the positive signal cannot be bridged across both left and right channels of the 3.5 mm jack; the channels must be wired separately.
4. Following international standard pinout definitions for 3.5 mm audio jacks: A jack with two black insulating rings is a dual-channel connector. Its tip corresponds to the stereo left channel, the middle ring is the right channel, and the base is the negative/ground terminal. A mono 3.5 mm jack only has one black insulating ring: the tip is the positive signal, and the base is the negative/ground terminal.

We hope this guide clarifies how to diagnose no-audio issues for network cameras. If you have further questions, feel free to contact Kaimorui’s technical team.