Digital radio

digitalDABdigital transmissionradiochannelsDAB+digital audio broadcastingdigital broadcast radiodigital networked radiodigital receiver
Digital radio is the use of digital technology to transmit or receive across the radio spectrum.wikipedia
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Digital audio radio service

DARSdigital audio radio satelliteSDARS
Digital transmission by radio waves includes digital broadcasting, and especially digital audio radio services.
Digital audio radio service (DARS) refers to any type of digital radio program service.

Digital Radio Mondiale

DRMdigitalDigital Radio Mondiale (DRM)
In 2012 four digital wireless radio systems are recognized by the International Telecommunication Union: the two European systems Digital Audio Broadcasting (DAB) and Digital Radio Mondiale (DRM), the Japanese ISDB-T and the in-band on-channel technique used in the US and Arab world and branded as HD Radio.
Digital Radio Mondiale (DRM; mondiale being Italian and French for "worldwide") is a set of digital audio broadcasting technologies designed to work over the bands currently used for analogue radio broadcasting including AM broadcasting, particularly shortwave, and FM broadcasting.

HD Radio

HDHD2HD-2
In 2012 four digital wireless radio systems are recognized by the International Telecommunication Union: the two European systems Digital Audio Broadcasting (DAB) and Digital Radio Mondiale (DRM), the Japanese ISDB-T and the in-band on-channel technique used in the US and Arab world and branded as HD Radio.
HD Radio is a trademarked term for iBiquity's in-band on-channel (IBOC) digital radio technology used by AM and FM radio stations to transmit audio and data by using a digital signal embedded "on-frequency" immediately above and below a station's standard analog signal, providing the means to listen to the same program in either HD (digital radio with less noise) or as a standard broadcast (analog radio with standard sound quality).

Datacasting

datacastdata broadcastingdata
The aim is to increase the number of radio programs in a given spectrum, to improve the audio quality, to eliminate fading problems in mobile environments, to allow additional datacasting services, and to decrease the transmission power or the number of transmitters required to cover a region.
The EUREKA 147 and HD Radio standards both allow for datacasting on digital radio, defining a few basics but also allowing for later expansion.

In-band on-channel

IBOChybridHD digital
In 2012 four digital wireless radio systems are recognized by the International Telecommunication Union: the two European systems Digital Audio Broadcasting (DAB) and Digital Radio Mondiale (DRM), the Japanese ISDB-T and the in-band on-channel technique used in the US and Arab world and branded as HD Radio. FMeXtra (FM band IBOC subcarriers)
In-band on-channel (IBOC) is a hybrid method of transmitting digital radio and analog radio broadcast signals simultaneously on the same frequency.

FMeXtra

FMeXtra (FM band IBOC subcarriers)
FMeXtra is a deprecated in-band on-channel digital radio broadcasting technology created by Digital Radio Express.

ISDB

ISDB-TISDB-SIntegrated Service Digital Broadcasting-Terrestrial
In 2012 four digital wireless radio systems are recognized by the International Telecommunication Union: the two European systems Digital Audio Broadcasting (DAB) and Digital Radio Mondiale (DRM), the Japanese ISDB-T and the in-band on-channel technique used in the US and Arab world and branded as HD Radio.
The Integrated Services Digital Broadcasting (ISDB; Japanese: 統合デジタル放送サービス, Tōgō dejitaru hōsō sābisu) is a Japanese standard for digital television (DTV) and digital radio used by the country's radio and television networks.

MPEG-1 Audio Layer II

MP22II
In digital broadcasting systems, the analog audio signal is digitized, compressed using formats such as MP2, and transmitted using a digital modulation scheme. It is based on the MPEG-1 Audio Layer II audio coding format and this has been co-ordinated by the WorldDMB.
Part of the DAB digital radio and DVB digital television standards.

DVB-H

Digital video broadcasting – handheldDigital Video Broadcasting – Handheldsdigital video broadcasting-handheld
DVB-H
Among the services available will be Voice TV and Kiss digital radio.

Data transmission

digital communicationsdata transferdata communication
Digital transmission by radio waves includes digital broadcasting, and especially digital audio radio services. An older definition, still used in communication engineering literature, is wireless digital transmission technologies, i.e. microwave and radio frequency communication standards where analog information signals as well as digital data are carried by a digital signal, by means of a digital modulation method.
Examples are second-generation (1991) and later cellular telephony, video conferencing, digital TV (1998), digital radio (1999), telemetry, etc.

Digital audio broadcasting

DABDAB+digital radio
In 2012 four digital wireless radio systems are recognized by the International Telecommunication Union: the two European systems Digital Audio Broadcasting (DAB) and Digital Radio Mondiale (DRM), the Japanese ISDB-T and the in-band on-channel technique used in the US and Arab world and branded as HD Radio.
Digital audio broadcasting (DAB) is a digital radio standard for broadcasting digital audio radio services, used in many countries around the world, though not North America.

Audio coding format

audio coding standardaudio compression formatAudio coding
It is based on the MPEG-1 Audio Layer II audio coding format and this has been co-ordinated by the WorldDMB.
An audio coding format (or sometimes audio compression format) is a content representation format for storage or transmission of digital audio (such as in digital television, digital radio and in audio and video files).

Digital broadcasting

digital signaldigitaldigital broadcast
Digital transmission by radio waves includes digital broadcasting, and especially digital audio radio services. In digital broadcasting systems, the analog audio signal is digitized, compressed using formats such as MP2, and transmitted using a digital modulation scheme.
Digital radio

Single-frequency network

SFNsingle frequency networkbooster
Some digital broadcasting systems allow single-frequency network (SFN), where all terrestrial transmitters in a region sending the same multiplex of radio programs may use the same frequency channel without self-interference problems, further improving the system spectral efficiency.
OFDM is also widely used in digital radio systems, including DAB, HD Radio, and T-DMB.

Digital signal

digitaldigital signalsbinary signal
An older definition, still used in communication engineering literature, is wireless digital transmission technologies, i.e. microwave and radio frequency communication standards where analog information signals as well as digital data are carried by a digital signal, by means of a digital modulation method.
In digital radio schemes one or more carrier waves are amplitude, frequency or phase modulated by the control signal to produce a digital signal suitable for transmission.

IBiquity

iBiquity Digital Corp.
According to iBiquity, "HD Radio" is the company's trade name for its proprietary digital radio system, but the name does not imply either high definition or "hybrid digital" as it is commonly incorrectly referenced.
iBiquity Digital Corporation is a company formed by the merger of USA Digital Radio and Lucent Digital Radio, with the goal of creating an in-band on-channel (IBOC) digital radio system for the United States and around the world.

Wireless

wireless communicationwireless communicationswireless internet
An older definition, still used in communication engineering literature, is wireless digital transmission technologies, i.e. microwave and radio frequency communication standards where analog information signals as well as digital data are carried by a digital signal, by means of a digital modulation method.
Digital radio

Subcarrier

sub-carriersubcarriersFM stereo subcarrier
FMeXtra (FM band IBOC subcarriers)
An upgraded version is built into digital radio.

Orthogonal frequency-division multiplexing

OFDMorthogonal frequency division multiplexingCOFDM
DVB-T (based on OFDM modulation)
The digital radio systems DAB/EUREKA 147, DAB+, Digital Radio Mondiale, HD Radio, T-DMB and ISDB-TSB

Software-defined radio

software radioSDRSoftware Defined Radio
It also allows software radio implementations, where the transmission technology is changed just by selecting another piece of software.
Digital radio

High-Efficiency Advanced Audio Coding

eAAC+eAACHE-AAC
WorldDMB announced in November 2006 that DAB would be adopting the HE-AACv2 audio coding format, also known as eAAC+.
HE-AAC is used in digital radio standards like DAB+ and Digital Radio Mondiale.

Packet radio

PacketAmateur packet radiocomputer networking
Amateur packet radio:
Packet radio is a digital radio communications mode.

WorldDAB

WorldDMB
It is based on the MPEG-1 Audio Layer II audio coding format and this has been co-ordinated by the WorldDMB. The DAB Eureka 147 standard for digital radio is coordinated by the World DMB Forum.
WorldDAB is a global industry organisation responsible for defining the standards of the Eureka-147 family which includes DAB (Digital Audio Broadcasting) and DAB+ for digital radio Digital radio.

Federal Communications Commission

FCCFederal Communications Commission (FCC)Federal Communication Commission
The FCC has auctioned bandwidth allocations for satellite broadcast in the S band range, around 2.3 GHz.
For digital radio, the FCC chose proprietary HD Radio, which crowds the existing FM broadcast band and even AM broadcast band with in-band adjacent-channel sidebands, which create noise in other stations.

Multiplexing

multiplexedmultiplexmultiplexes
The UK currently has the world's biggest digital radio network, with 103 transmitters, two nationwide DAB ensembles and 48 local and regional DAB ensembles, broadcasting over 250 commercial and 34 BBC radio stations; 51 of these stations are broadcast in London.
In digital radio, a multiplex (also known as an ensemble) is a number of radio stations that are grouped together.