Digital signal processing chips, digital signal processors, electronic broadcast signal processors, electronic circuits and integrated circuits; electronic controllers for processing and controlling audio signals and for measuring, analyzing and controlling audio volume levels; computer software for measuring, analyzing, controlling, processing, encoding and decoding audio signals; digital audio and video recorders and players; wireless communication devices for voice, data or image transmission; audio-receivers and video-receivers; portable computers; sound and video recording and playback machines; televisions; telephones and mobile telephones; radio receivers and transmitters; audio and video tuners, namely, audio-receivers and video-receivers; speakers, namely, audio speakers; headphones; set-top boxes