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The decoder sorts out different sounds from the video and sends the info to the amplifiers to find their respective channel output. Next, the receiver sends the video signals to the output device (TV, monitor, etc.) and audio signals to the decoders. The user chooses which input component needs to be fed to the output device and then the preamplifier selects that signal and amplifies it wherever needed. The source devices send the audio and video signals to the receiver device. The processing of audio and video signals is simple. Surround-sound decoders (Dolby Digital, Dolby TrueHD, Dolby Atmos).AV input/output (S/PDIF, HDMI, USB, RCA).The primary function of receivers is to receive, interpret, and process the audio/video signals and transmit them over some output devices. The main purpose of AV receivers is to receive the audio or video signals from several sources and route those signals through devices like the TV, speakers, monitor, projector, etc. But have you ever thought about the actual brain-the audio/video (AV) receiver-working behind the complete home-theater system? AV receivers are the hub of a home-theater system and provide the main source of power (Fig.