Conference room AV systems are the microphones, speakers, cameras, screens and controls that let people in a meeting room or lecture hall hear and see each other, and include people who are far away. AV stands for audio-visual.
A room system has five main parts. The microphones are often arrays in the ceiling. An array is a panel holding many small microphones. Sound from a speaking person reaches each microphone at a slightly different moment, and the system uses these tiny differences to pick up that one voice and ignore other sounds. This is called beamforming. The sound processor cleans up the sound. Its most important job is echo cancellation: it removes the remote callers' voices, which come out of the room's speakers, from the microphone signal, so that the callers do not hear themselves a moment later. The cameras turn and zoom towards whoever is talking. The screens and projectors show the slides and the remote callers. The room control panel lets one person start everything with a single tap.
Consider a 180-seat lecture hall at an engineering college in Coimbatore that streams and records every lecture. The lecturer walks about without a microphone clipped to her collar. Four microphone arrays in the ceiling pick up her voice wherever she stands. The sound processor sends her voice to the hall's speakers and into the video call, where 60 students join from hostels and homes. When a student in row 12 asks a question, the nearest array picks it up, and the camera turns to that row. When a remote student asks a question, it comes out of the hall's speakers, and echo cancellation keeps it out of the microphone signal. During the slides, the system dims the lights at the front through the lighting system. After the lecture, the recording is uploaded to the college's campus management system.
How has this changed? Until recently, each function had its own box: a mixer, a sound processor, a video switcher and a controller, all wired together in a rack. Now much of this runs as software on one standard computer, and the sound and video travel over the ordinary network. Adding a microphone or a room means changing the software settings, not rewiring the rack. This shift is an example of hardware-software disaggregation.
Who installs it? A college or a company rarely buys these systems straight from the maker. An AV system integrator designs the room: where each microphone and speaker goes, and how many cameras the room needs. It buys equipment from several makers, installs it, and writes the room's control program. The maker reaches thousands of rooms this way, through channel sales.
The makers of these systems write much of their software in Bengaluru.