An apparatus and method is described for transmitting, receiving and communicating program data signals which are combined with digital data signals. Preferably, the present invention compresses 30 digital audio signals, multiplexes them with title, track, artist, record label, year, etc., program information,...http://www.google.com/patents/US5239540?utm_source=gb-gplus-sharePatent US5239540 - Method and apparatus for transmitting, receiving and communicating digital data signals with corresponding program data signals which describe the digital data signals
