Background
First there was digital television, called
"the latest breakthrough in television." Now, digital radio is
catching on as a popular form of broadcasting. The Federal
Communications Commission (FCC) has moved a step closer to
bringing digital radio to millions of Americans.
What is Digital Radio
Digital radio is the transmission and
reception of sound that has been processed using technology
comparable to that used in compact disc (CD) players. In short, a
digital radio transmitter processes sounds into patterns of
numbers, or "digits"– hence the term "digital radio." In contrast,
traditional analog radios process sounds into patterns of
electrical signals that resemble sound waves.
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FM digital radio is capable of providing
clear sound comparable in quality to CDs. Digital receivers
provide significantly clearer sound than conventional analog
radios, just as CDs sound clearer than record albums.
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AM digital radio is capable of providing
sound quality equivalent to that of standard analog FM, and
sounds dramatically better than analog AM. Some broadcasters
believe that digital broadcasting may bring music back to the AM
band.
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Digital radio reception is more resistant
to interference, and eliminates many imperfections of analog
radio transmission and reception. There may be some interference
to digital radio signals in areas that are distant from a
station’s transmitter.
Digital Radio Technology
In 2002, the FCC selected in-band, on-channel
(IBOC) technology as the technology AM and FM broadcasters use for
digital radio broadcasting. Broadcasters have begun IBOC
transmission on an interim basis while formal transmission
standards are developed.
Transition to digital radio requires
broadcasters to install new equipment. During the transition,
broadcasters will operate in a “hybrid” mode, broadcasting the
same programming using both analog and digital signals within a
single AM or FM channel. Many FM broadcasters now offer two or
more digital channels. The new digital technology will not require
allocation of additional radio spectrum and will have minimal
impact on present broadcast services. Consumers will continue to
receive their current analog stations with minimal disruption.
Although the FCC has moved a step closer to
bringing digital radio to you, at this time radio broadcasters are
not required to convert to “all-digital” broadcasting.
Advantages for Listeners
Digital radio offers a number of consumer
advantages over traditional analog radio, including:
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Better audio quality, more robust signals,
and new auxiliary services, such as multiple audio programming
channels, audio-on-demand services, and interactive features.
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Enhanced radio designs with simplified
functions. Simply select the station you want from the call
letters or names displayed on the digital radio liquid crystal
display (LCD) and the computer within the radio will do the
rest.
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Potential to introduce new data and
information services that will be displayed on the radio’s small
screen when “all-digital” operations are introduced. For
example, a station could send background information about a
band when that band’s music is playing. Advertisers could send
information about discounts and sales. Listeners could program
their radios to receive customized weather reports, news, or
stock quotes.
Do I Need a New Radio to Receive Digital Quality?
Yes. A digital receiver is required to
receive digital signals. Listeners can use their digital receiver,
however, to tune to stations that are not broadcasting in digital.
Early models are expected to cost more than
analog radios, but the FCC has no information on how much more.
Will Digital Radio Impact Subcarrier Frequencies and Services Such as Radio
Reading Services?
Many states have services, such as radio
reading service, that broadcast over the subcarrier or Subsidiary
Communications Authority (SCA) of a public or private radio
station. These services provide information, either free or for a
nominal fee, to people who are unable to read print.
Under some circumstances, digital radio
signals may interfere with the subcarriers used for radio reading
services. While relatively few listeners are likely to be
affected, the FCC is concerned about digital radio’s potential
impact on radio reading services, and expects broadcasters to work
to resolve any complaints regarding interference to such services.
Public broadcasters plan to replace the old analog radio reading
services, which generally have limited audio quality, with new
digital service.
For More Information
For information about other telecommunications
issues, visit the FCC’s Consumer & Governmental Affairs Bureau Web site at
www.fcc.gov/cgb, or contact the FCC’s Consumer Center by
e-mailing fccinfo@fcc.gov; calling
1-888-CALL-FCC (1-888-225-5322) voice or 1-888-TELL-FCC (1-888-835-5322) TTY;
faxing 1-866-418-0232; or writing to:
Federal Communications Commission
Consumer & Governmental Affairs Bureau
Consumer Inquiry and Complaints Division
455 12th Street, SW
Washington, DC 20554.
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