digital audio radio service
TRANSCRIPT
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BROADCAST AND ACOUSTICSSATELLITE RADIO AND DARS
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SATELLITE
a satellite is an object which has been
placed into orbit by human endeavor.
Such objects are sometimes
called artificial satellitesto distinguishthem from natural satellites such as
the Moon.
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TRIVIA
The world's
first artificialsatellite,
the Sputnik 1,
was launched
by the Soviet
Union in 1957.
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RADIO
Radio is the transmission of signals
through free space by electromagneticradiation of a frequency significantly below
that of visible light, in the radio
frequency range, from about 30 kHz to
300 GHz.
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SATELLITE RADIO
Satellite radio is
an analog or digital radio signal that isrelayed through one or more satellites and
thus can be received in a much wider
geographical area than terrestrial FMradio stations.
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DIGITAL AUDIO
Digital audio refers to technology
that records, stores, and reproducessound by encoding an audio signal
in digital form instead of analog form.
Sound is passed through an analog-to-
digital converter (ADC), and pulse-codemodulation is typically used to encode it as
a digital signal.
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DIGITAL AUDIO RADIO SERVICE
Digital Audio RadioService (DARS) refersto any type of digital
radio service.
In the United States it
is the official FCC term
for digital radio
services
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TYPES OF DARS
Satellite DARS Terrestrial DARS
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SATELLITE DARS
SIRIUS SATELLITE RADIO XM SATELLITE RADIO
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SIRIUS SATELLITE RADIO
Sirius SatelliteRadio is a satelliteradio (SDARS)
service operating in
North America,owned by Sirius XM
Radio
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SIRIUS SATELLITE RADIO
Headquartered in New York City, with smaller
studios in Los Angeles and Memphis, Sirius was
officially launched on July 1, 2002 and currentlyprovides 69 streams (channels) of music and 65
streams of sports, news and entertainment to
listeners. Music streams on Sirius carry a wide
variety of genres, broadcasting 24 hours daily,
commercial-free, and uncensored. A subset of
Sirius music channels is included as part of
the Dish Network satellite television service.
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XM SATELLITE RADIO
XM Satellite
Radio (XM) is one oftwo satellite
radio (SDARS)
services in the United
States and Canada,
operated by Sirius XM
Radio.
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XM SATELLITE RADIO
It provides pay-for-service radio,
analogous to cable television. Its service
includes 73 different music channels, 39
news, sports, talk and entertainment
channels, 21 regional traffic and weather
channels and 23 play-by-play sportschannels.
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XM SATELLITE RADIO
The company has its origins in the 1988
formation of the American Mobile SatelliteCorporation (AMSC), a consortium of severalorganizations originally dedicated to satellite
broadcasting of telephone, fax, and data signals.
The satellite service was officially launched on
September 25, 2001.
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MERGER
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MERGER
On July 29, 2008, XM and Sirius SatelliteRadio formally completed their merger, following
U.S. Federal CommunicationsCommission (FCC) approval, forming Sirius XMRadio, Inc. with XM Satellite Radio, Inc. as itssubsidiary.
On November 12, 2008, Sirius and XM beganbroadcasting with their new, combined channellineups.
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MERGER
On January 13, 2011, XM Satellite Radio,
Inc. was dissolved as a separate entityand merged into Sirius XM Radio, Inc
Prior to its merger with Sirius, XM was thelargest satellite radio company in the
United States.
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While XM Radio and Sirius have merged
into a single company, the two servicesaren't fully integrated yet. Part of the
reason for this is due to differences in
hardware and software.
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CHANNELS
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TECHNOLOGY
25 MHz in S band 2.3 GHz
2 multichannel operators
2320-2332.5 MHz(Sirius)
2332.5-2345 MHz (XM)
complementary terrestrial
repeaters
to overcome effects of
satellite signal blockage
and multipath
interference
AM/FM/SAT receivers
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SDARS Spectrum
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TECHNOLOGY
XM Radio uses two Boeing HS 702
satellites, appropriately nicknamed "Rock"and "Roll," and two BSS 702 satellites it
calls "Rhythm" and "Blues," placed in
parallel geostationary orbit, two at 85
degrees west longitude and the other two
at 115 degrees west longitude.
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TECHNOLOGY
The first XM satellite, "Rock," was launched on
March 18, 2001, with "Roll" following on May 8
of the same year. A design flaw in the HS 702
satellite caused its solar panels to function
inefficiently. XM launched "Rhythm" on
February 28, 2005, and "Blues" on October30, 2006, to replace the older satellites.
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ORBITS
Low Earth OrbitsHeight: 700-2000 km
Rotation Period: 90 min.
Time in LOS of
earth station: 15 min.
Medium Earth OrbitsHeight: 8000-12000 km
Rotation Period: 5-12 hrs.
Time in LOS of
earth station: 2-4 hrs.
Geostationary OrbitsHeight:35,780 km
Rotation Period: 24 hrs.
Time in LOS of
earth station: 24 hrs.
GSONGSO
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iPhone, iPod Touch, BlackBerry
and Android applications
Sirius XM developed a software
application for use onthe Apple iPhone and Apple iPod
Touch devices that will allow Sirius XM
subscribers to listen to its programming
over the Apple devices. The Sirius XM
iPhone App became available in the
Apple iTunes Store on June 17, 2009
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iPhone, iPod Touch, BlackBerry
and Android applications
On February 4, 2010, Sirius XM released
an app for the Research InMotion BlackBerry line of Smartphone,
including the Storm (Series
9500), Bold (Series 9000 and9700), Tour(Series 9600)
and Curve (Series 8500 and 8900).
http://en.wikipedia.org/wiki/BlackBerry_Stormhttp://en.wikipedia.org/wiki/BlackBerry_Boldhttp://en.wikipedia.org/wiki/BlackBerry_Tourhttp://en.wikipedia.org/wiki/BlackBerry_Curvehttp://en.wikipedia.org/wiki/BlackBerry_Curvehttp://en.wikipedia.org/wiki/BlackBerry_Tourhttp://en.wikipedia.org/wiki/BlackBerry_Boldhttp://en.wikipedia.org/wiki/BlackBerry_Storm -
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RECEIVERS
As of 2005, Sirius receivers are available for various
new Audi, BMW, Cadillac, Chrysler, Dodge,
Ford, Infiniti, Jaguar, Jeep, Land
Rover, Lexus, Lincoln, Mazda, Mercedes-
Benz, Mercury, MINI,
Mitsubishi, Nissan, Scion, Toyota(except Corolla), Porsche, Volkswagen,
and Volvo vehicles, and the service plans on adding
availability for portable use.
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RECEIVERS
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