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How Does a Baby Monitor Work?
How to Buy a Baby Monitor
Baby monitors are radio transmitters that allow you to hear your baby when you're not present in the room with her. Monitors come in a variety of styles and include many different features, so follow these steps to buy one that suits your needs and lifestyle
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Quality can refer to both how detailed the image is and how fast the frame rate is. Frame rate is simply a measure of how many individual pictures make up the video. "Full motion", what you see on television and on VHS tapes, is 30 frames per second, or fps. Most often, security systems record at slower rates, which result in more jerky-looking images but saves tape or hard drive space, allowing longer periods of time to be recorded.
Camera formats are measured in inches: most surveillance cameras fall between 1/4" and 1". This refers to the usable image size created inside the camera. For most security systems, a small size is fine - 1/4" or 1/3" surveillance cameras dominate CCTV sales. Larger formats do not necessarily result in better images, but can be advantageous in dimly lit situations since they are able to gather more light.
Wireless cameras are basically wireless transmitters carrying a camera picture signal. The camera is wireless and the video signal travels between the camera's transmitter to the receiver. This works much like a radio. The sound you hear on a radio is wireless and you tune to a certain frequency and hear the sound. Wireless cameras also have channels. The receiver needs to tune into the same channel as is being used by the transmitter in order to receive the picture.
The process is the following: The Camera sees the image, and sends it to the transmitter. The transmitter then sends the signal through the air to the receiver, which picks up the signal and outputs it (via a cable connection) to a TV/Monitor/Digital Video Recorder. Keep in mind that both the camera and transmitter require power. The power is provided either by battery and/or transformer/adapter.
In some wireless systems, the camera and transmitter is very small and the power is provided to both from one source. A good example of this is a hidden wireless camera in a clock radio. In this case, the wireless camera is powered by plugging in the clock. The camera and wireless transmitter are provided power by the clock radio internally.
