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2. Closed-circuit television camera - Wikipedia

   en.wikipedia.org/wiki/Closed-circuit_television...

   IP cameras or network cameras are digital video cameras, plus an embedded video server having an IP address, capable of streaming the video (and sometimes, even audio). [3] Because network cameras are embedded devices, and do not need to output an analogue signal, resolutions higher than closed-circuit television 'CCTV' analogue cameras are ...

3. Wireless security camera - Wikipedia

   en.wikipedia.org/wiki/Wireless_security_camera

   Wireless security cameras are closed-circuit television (CCTV) cameras that transmit a video and audio signal to a wireless receiver through a radio band. Many wireless security cameras require at least one cable or wire for power; "wireless" refers to the transmission of video/audio.

4. Closed-circuit television - Wikipedia

   en.wikipedia.org/wiki/Closed-circuit_television

   CCTV security cameras can either store the images on a local hard disk drive, an SD card, or in the cloud. Recordings may be retained for a preset amount of time and then automatically archived, overwritten, or deleted, the period being determined by the organisation that generated them.

5. Video management system - Wikipedia

   en.wikipedia.org/wiki/Video_management_system

   A VMS can also be capable of recording audio from network cameras, and may in some cases provide two-way audio through a network camera, acting as an intercom. Typically this requires an external amplifier and speaker by the camera. Some network cameras include a built-in microphone, or may provide external audio I/O connections.

6. Digital video recorder - Wikipedia

   en.wikipedia.org/wiki/Digital_video_recorder

   Many are designed to record audio as well. DVRs have evolved into devices that are feature rich and provide services that exceed the simple recording of video images that was previously done through VCRs. A DVR CCTV system provides a multitude of advanced functions over VCR technology including video searches by event, time, date and camera.

7. Slow-scan television - Wikipedia

   en.wikipedia.org/wiki/Slow-scan_television

   AVT is an abbreviation of "Amiga Video Transceiver", software and hardware modem originally developed by "Black Belt Systems" (USA) around 1990 for the Amiga home computer popular all over the world before the IBM PC family gained sufficient audio quality with the help of special sound cards. These AVT modes differ radically from the other ...