The details of an audio-visual matrix switcher by Stefan Seigel
An audio-video (A/V) matrix routing switcher is the core of a signal management system whose main purpose is to simplify the connection of multiple A/V sources to single or multiple displays. For example, if one has 32 security cameras and one wants to display them on 16 monitors, one would use a 32x16 routing switcher between the cameras and the monitors, using cables to interconnect the pieces. With active and buffered circuitry isolating the inputs from the outputs, the switcher would allow one to select any camera to be displayed on a single monitor or multiple monitors, glitch-free, without compromising the integrity of the original signal, just as though the source was hardwired directly to each monitor.
Two of the primary considerations for a matrix switcher are size and signal format. The size of the matrix is expressed as [Inputs] x [Outputs]. A QuickSet modular matrix switcher can be built to almost any size requirement from 8x8 to 256x256 and can be easily expanded as a system grows beyond its original design. Some of the features that can be found on our modular switchers include high bandwidth for passing high resolution signals for optimal video reproduction, built-in preview monitor for easy viewing of one’s sources, vertical interval switching providing “glitch-free” transitions when switching video signals of the same format, and a mil-spec power supply (with optional redundant supplies available) for trouble-free operation in the harshest environments. QuickSet routers can be configured to handle almost any type of video and audio signal format: Composite Video, S-Video (Y/C), Component Video (RGB / YUV / Y,R-Y,B-Y) and five-component computer video with sync (VGA/RGBHV). Depending on the system layout and design, audio can be ordered as unbalanced mono/stereo or low-noise balanced audio for maximum signal clarity. Additionally, the switchers can be configured as audio-only or video-only when the need arises. A feature that is often overlooked is switcher control.
The Quickset modular routing switchers offer both a front panel keypad controller as well as RS-232 control. The serial port can be utilized with a variety of remote controllers provided by QuickSet. Compatibility is assured with third party controllers from Creston, AMX and Leightronix as well as any other that can communicate serially. The extensive library of RS-232 commands is comprised of Simple ASCII Strings (SAS) that are easy to learn and implement, enabling one to tailor a solution based on the specific requirements for any project.
Common applications include prison visitation, security and surveillance, sports bars and casinos, pre and post-production and distant learning to name but a few. Any application that has more than a single source of video and/or audio to be connected to one or a multiple of displays would be well served by a matrix switcher.
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