Page "Edwin Howard Armstrong" Paragraph 34

Within a few years a majority of households were FM equipped, by the 1980s a majority of cars sold had FM stereo radios and a majority of listening in the U. S. was devoted to FM signals according to the Arbitron rating service.

The stereo sound revolution, followed by the programming revolution, accomplished what cleaner and crisper sound alone was unable to achieve, and made FM radio a permanent and important part of the communications landscape.