CCTV Cameras with Audio either have a built-in microphone on the camera or an audio-input connector to connect an add-on microphone. Regardless of whether the mic is built-in or external, security camera microphones are sensitive enough to pickup sounds from a 40ft radius when in a quiet room. Although results vary based on ambient noise, these security cameras are a great way to record both video and audio.
Choosing a camera for your security camera system depends on whether you need an analog camera, HDCVI camera, or IP camera. Surveillance cameras with built-in microphones allow the easiest connection to a security video recorder. HDCVI cameras don’t need a cable with an audio connector; the audio signal is combined with the video signal. You simply need a HD Siamese Cable or a roll of RG59 Coax. For IP cameras with audio, the audio/video/power signals are carried over one network cable. For analog cameras we recommend using our 50ft Audio Video Power Cables or 150ft Audio Video Power Cables that make camera cable installation simple since the cable contains connectors for audio, video, and DC power.
For cameras with optional external microphone inputs, you will need a microphone, a RCA coupler to attach the mic to the camera, and a 12VDC power supply to provide power to the mic next to the camera. For HDCVI and network IP cameras with external audio inputs, once the mic is connected to the camera, audio is combined with the video signal and sent over the cable back to the HDCVI DVR or NVR, respectively.
This is due to the depth of field changing as the light conditions change and can be easily overcome by following set procedures.
The answer is when setting the back focus of a Color camera for low light conditions you should place an ND1 (Neutral Density) filter in front of the lens. When setting the back focus of a Mono camera for low light conditions you should place an ND3 (Neutral Density) filter in front of the lens. When setting the back focus of a Mono camera fitted with I/R lighting for low light conditions you should place an IRP (Infra-Red Pass) filter in front of the lens.
So are you wondering how Do I Choose The Correct CCTV Camera?
- This in general is a comparatively difficult decision. Many aspects of the CCTV camera installations must be taken into consideration in order to obtain the correct performance that meets your requirements.
- A high-resolution camera should be considered where greater detail of scene is required. E.g. Color view 2MP, 5MP or even 8MP 4K CCTV Cameras. Choosing a more sensitive camera will improve reproduction in poorly lit areas. The sensitivity of a camera is indicated by the minimum amount of light in order for the camera to produce a usable picture. e.g. Color 1.0 Lux at F1.2.
- A conventional camera produces a pale backdrop when an object is shot against a bright background. BLC (Back Light Compensation) will counter strong light sources retaining picture quality.
- Concentrated light sources directed towards the camera (e.g. car head lamps) can be inverted by an optional peak white inverter or an eclipse function. This has the effect of bringing detail to areas and making an object clear, that would otherwise be shadowed.
CCTV Hardware Compression: Both Capturing Video Signal and Compressing Video Signal are done by DSP chipset integrated on DVR Board. It doesn’t need the computer’s CPU to do this work. It’s a low cost of CPU and RAM resources. In this system the computer CPU’s task focus on answering network request, streaming the video/audio to network and saving recorded data to local hard disk.
CCTV Software Compression: The DVR Board only capture video signal but doesn’t compress it, it is the computer CPU and RAM to do this compression work. It’s a high cost of CPU and RAM resources. In this system, the computer CPU and RAM are often overloaded. It is easier to crash than hardware compression system.