Editing Subcarrier (section)

==Private audio==
Before [[communications satellite|satellite]], [[Muzak Holdings|Muzak]] and similar services were transmitted to [[department store]]s on FM subcarriers. The fidelity of the subcarrier audio was limited compared to the primary FM radio audio channel. {{cn|date=April 2015}}  The United States [[Federal Communications Commission]] (FCC) also allowed [[Off-track betting|betting parlor]]s in [[New York (state)|New York]] state to get [[horse racing]] results from the state gaming commission via the same technology.{{cn|date=April 2015}}

Many [[non-commercial educational]] FM stations in the US (especially [[public radio]] stations affiliated with [[NPR]]) broadcast a [[radio reading service]] for the blind, which reads articles in local newspapers and sometimes magazines. The vision-impaired can request a special radio, permanently tuned to receive audio on a particular subcarrier frequency (usually 67&nbsp;kHz or 92&nbsp;kHz), from a particular FM station.  

Services like these and others on broadcast FM subcarriers are referred to as a [[Subsidiary Communications Authority]] (SCA) service by the FCC in the [[United States]], and as Subsidiary Communications Multiplex Operations (SCMO) by the [[Canadian Radio-television and Telecommunications Commission]] (CRTC) in [[Canada]].