Broadcasting transmissions and radio frequencies is thought of as a black box by many of the people who use its technology daily. Television and radio are just a few of the ways broadcasting is used today.
The telephone was a revolutionary invention for its time however technology available in the latest cell phones is beyond science fiction. Availability of phones and communication devices allows information to spread quickly and efficiently.
Audio technology has evolved dramatically since the phonograph emerged in 1877. Digital audio techniques have revolutionized the music and entertainment industry along with creating jobs in audio engineering, video game audio and movies.