PPM

WHERE DO RADIO RATINGS COME FROM?

Most people think that their listening habits determine which radio stations are the most popular.  They’re partially correct. The real “ears” of audience measurement in 48 U.S. markets – including its largest cities – is this black, pager-like device called a Portable People Meter or PPM. It listens for hidden audio streams embedded in radio station (or network) signals that tell Nielsen Audio what you’re listening to – or at…