Channels of XM namely XM Pop and fine tuning are broadcasted in surround audio quality. Thus bandwidth is separated into segments of four kilo bit per second virtual streams which are combined to form audio and data channels of varying bit rates from four to sixty four kilobits per second in the current service. Audio data is stored digitally using MPEG two audio technologies at three hundred and eighty four kilo bits and is further processed by the audio processors on the way to broadcast. This technique of recording music is not new. XM satellite radio's music is commercial free. The audio content of the XM signals is pre processed using the audio processors which use the special coding technique. This is possible because of the enhanced compatible devices.
The groups of two carriers broadcast hundred eight kilobits per second streams. Also the music can be recorded and can be enjoyed afterwards.
This technology is a partnership between XM and Neural Audio Corporation which provides content with six discrete channels of digital full fidelity audio powered by Neural Audio technology. Other four carriers carry duplicates of the same content to achieve redundancy through diversity of signals. Music that has been recorded can only be accessed on the portable devices and it can not be transferred to a home computer or separate digital music player. But the organization responded by quickly rolling out adaptive interfaces to allow almost any XM
Laminated Glue subscriber to use their tuner to build music libraries directly from XM broadcasts.
The whole content of the radio service that is both data and audio content is represented by only two carriers. Another channel namely XM live also broadcasts in this format for select concerts and studio performances. Manufacturing partners of XM have introduced home audio systems capable of playing XM HD Surround powered by Neural Audio. Combined streams whose combination is done using a patented process form a variable number of channels using a variety of bit rates.
This concept came into existence after many formal announcements and public meetings.
But if the account is terminated the recorded content will becomes inaccessible. Time delayed and error correction schemes are used for carrying data on each carrier.
Thus the total effective radio spectrum used for content is a little over four mega hertz. The music content recorded by a subscriber is only available when the subscriber has an active account with XM Satellite Radio. Also there is a condition that if a subscriber fails to listen to a total of 8 hours of programming a month the recorded content will not be accessible.
. This is done to enhance availability. This technique was tried to spoil by discontinuing the required XM PCR radio. Applications have been developed which record songs to MP3 and tag them with the artist and title information directly from the XM network.
They also include spectral band replication.
