Something doesn’t smell right here.
In 1979, the technology for an iPod didn’t exist, or was still in the laboratory stage. Memory chips, LCD screens and the iPod touch dial was still 10 years away.
An iPod is an iPod because of its small size. A (much larger) desktop ‘Apple II’ machine and video games of the time may have had the capability for rudementary MIDI files, but in 1979 a ‘Sound Card’ didn’t exist. And battery technology was nothing like today’s.
It's a "concept" patent. That means it's something like I describe a machine that teleports a human being to the Moon and back. I don't have any idea exactly how it would work, but I know it will have to have a transmitter and a receiver, scanning and ... So I write it up and send it to the Patent Office. They don't find anything in the literature or existing patents, so I get the patent. I don't have to build it, or even prove it will work. Patent model? That's so passé.