Digital signal processing chips, integrated circuits, [ set top cable boxes, satellite receivers, ] television receivers, digital television receivers, audio and video players and recorders, audio and video surround sound controllers; electronic equipment for measuring, analyzing and controlling audio volume level; [ portable audio equipment, namely, portable and handheld digital electronic devices for processing, recording, reproducing, transmitting, receiving, and playing audio and video files; computer software for processing audio and video sound signals and for playing audio files, and computer software that delivers audio sound from DVDs loaded into a computer; ] multi-channel sound processors; audio/video amplifiers and receivers; cable television receivers and decoders; [ computer programs having sound generating capabilities, namely, software used to digitally encode and decode multi-channel sound for pre-recorded audio discs; video discs, laser discs, DVD video discs, and DVD audio discs; software used to measure, analyze, and control audio volume level; ] electronic broadcast signal processors; electronic satellite broadcast processors, and electronic audio encoders and decoders for digital audio sound signals, cable television, high definition television and radio