The technology behind satellite radio

The innovation behind satellite radio

Source: Flickr

Any tune you hear on satellite radio stars as a recording in a particular format on various recording mediums. IN MANY CASES, the taping quality needs to be maintained relatively high, typically around 384kb/s, while likewise being reasonably little sufficient to be transferred on CDs and DVDs. The music tracks utilized in satellite radio are cataloged utilizing a similar system to the MP3 cataloging requirements, the ID3 tags. The choice for the music tracks that will be played is made by each channel individually. The DJ picking the tracks usually picks about 20-30 minutes worth of music. The DJ needs to pay attention to the tracks to make sure they remain in appropriate condition and then merely lets the computer decode the original file. The very same thing is duplicated as soon as the preliminary 20-30 minutes are tired and the music playing cycle repeats itself.

Sound encoding in satellite radio

Encoding is one of the crucial elements of digital radio. Each channel is managed by a various encoder. The encoder generally takes the analog file and turns it into a digital one. The digitalization procedure is made in genuine time and the music files are transformed into 1’s and 0’s. This process is carried out by effective computers that evaluate acoustic waves and frequency and break them into binary code. The encoding process is performed at 128kb/s, 44.1 Kh which is really CD quality. After the tune is encoded, it is transferred to a multiplexer where other channels are likewise present– the multiplexer basically takes all the channels of the satellite radio company and integrates them into a single broadcast transmission. The data is then sent out to a satellite modem device which modulates the information and sends it to the broadcaster’s satellites, utilizing unique transmission frequencies.
What happens above the Earth
Here is where the satellites lie. They get the transmission and transmit it to the receivers we have in our homes and vehicles. The satellites lie at 23,000 miles above us– both Sirius and XM Radio utilize satellites situated at this range from the Earth. The satellites lie in geo-sync, which means that hello orbit above the place they are designated to service at all times. When the satellite receives the transmission encoded at 128kb/s, 44.1 khz it rebroadcasts it to the geographical area it covers. Both Sirius and XM Radio use satellites that cover particular locations of the United states– primarily the East and West coasts. For example, one of XM Radio’s satellites covers the western part of USA, probably a location located approximately from Seattle to San Diego on the West and Minneapolis to Houston on the east. The increased sound quality is possible since the broadcasted information (music tracks, news, sports transmission) do not get sliced up too many times in the decoding process.

The antenna

The antenna connected to your satellite radio receiver gets the transmission on L-Band. The current technological advances have actually permitted digital radio broadcasters to develop receivers little enough to fit mobile locations. In the early days of satellite radio, a big parabolic dish would need to be mounted on the car in order to get signal. Likewise, prior to the more compact receivers were developed, the early satellite radio receivers needed electronic motions that directed the dish to the satellite view. Modern flat panel receivers have eliminated all the problems of their predecessors and can be fitted practically anywhere without taking up excessive area.
The receiver and the output
The receiver is the device that decodes the data, basically doing the exact reverse of exactly what the encoding procedure resembled. After receiving the signal from the antenna it enhances it and transforms it to usable noise. The cars and truck or home audio system is then able to play the chosen satellite radio channel. The remainder of the procedure is precisely like analog broadcasts would work, with an amplifier and speakers outputting the sound.


( word count 659).

Related posts