Network Security Cameras With Audio Detection Alarm

An especially useful feature of network security cameras is audio detection alarm. It is usually used to complement other more typical forms of surveillance such as video recording and motion detection. In conditions where it might be too dark for video, or for areas that are not covered by the network security camera’s field of view an audio detection alarm can be used.

The usual triggers are specific sounds like a window breaking or voices and the event that follows can be to start the recording of a video camera, send a notification to alert the operator of possible intruders, or activate an alarm. It is the same as a motion detection device that will turn on security lights or an alarm. A very useful application is to use the audio alarm detection to trigger a security camera to turn to a predetermined area of interest such as a window. It is particularly paired with network security cameras because network cameras in a fully digital system are much more accommodating of digital devices.

Network Security Camera | Types of Lenses

Network security cameras use one of three types of lenses. They are either fixed, varifocal, or zoom lenses and each has its own strengths over the other types. The fixed lens in a network security camera offers only one field of view because the focal length is fixed, usually at 4 millimeters. The field of view is either telephoto, wide angle or normal.

Varifocal lens offer different fields of view because the focal lengths are not fixed and can do a range of lengths from 3mm to 8mm. The field of view has to be adjusted manually by the user and the lens requires manual refocusing whenever the camera's field of view is changed.

The automatic version of the varifocal lens is the zoom lens. It also allows for different fields of view but the lens does not need to be refocused when changing the field of view. The zoom lens in a network security camera also can hold focus within a range of focal lengths. The adjustment to the lens can be done manually or by remote control and the zoom capability in the specifications refers to the range between the network security camera's longest and shortest focal length.

Network Security Cameras With Megapixel Technology

Any network security camera that has the megapixel label in its specifications refers to the type of image sensor built into the camera. Megapixel image sensors are special because they can produce images with at least one million pixels. This offers a resolution that is, at minimum, twice the resolution a traditional analog security camera can provide.

The megapixel network security camera offers more than a typical security camera in field of view. A megapixel camera can provide a highly detailed image that can be useful for jobs like recognizing faces or reading a license plate. If the resolution of the image is not used to pull a high level of detail, then the megapixel camera can cover a larger area in a single shot than a non-megapixel network security camera would.