Thursday, June 30, 2005

How Satellite Radio Works

HowStuffWorks has an article on how satellite radio works.  This is a good article that describes how XM, Sirius and WorldSpace satellite radios work.

The one thing that I want to know is how they transmit their data.  For example, in my cars with XM, when I drive under an overpass, I don't hear a pause in the music.  But if I sit long enough under the overpass, the music cuts off.  So it appears that XM is transmitting the data at a higher bit-rate than the music requires.  Then there must be a carousel system so that if the radio loses the signal it can get the data about to be played from the buffer.

[via Droxy]