Digital radio

digitaldigital transmissionradiochannelsDABDAB+digital audio broadcastingdigital broadcast radiodigital networked radiodigital radio,
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

SDARSDARSdigital audio radio satellite
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.

Audio coding format

audio codingaudio coding standardaudio compression format
In digital broadcasting systems, the analog audio signal is digitized, compressed using an audio coding format such as AAC+ (MDCT) or MP2, and transmitted using a digital modulation scheme.
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 Radio Mondiale

DRMDRM+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.
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 (HDR) is a trademarked term for the in-band on-channel (IBOC) digital radio technology used by AM and FM radio stations mostly in the United States, Canada and Mexico (with a few implementations outside North America) 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 broadcastingInternet Protocol Datacasting
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.
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 is a deprecated in-band on-channel digital radio broadcasting technology created by Digital Radio Express.

ISDB

ISDB-TIntegrated Services Digital BroadcastingISDB-S
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

MP2MPEG-1 Layer IIMUSICAM
In digital broadcasting systems, the analog audio signal is digitized, compressed using an audio coding format such as AAC+ (MDCT) or MP2, and transmitted using a digital modulation scheme.
Part of the DAB digital radio and DVB digital television standards.

DVB-H

DVB-NGHDigital video broadcasting – handheldDigital Video Broadcasting – Handhelds
Among the services available will be Voice TV and Kiss digital radio.

Data transmission

data transferdigital communicationsdigital 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+DAB 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.

Digital broadcasting

digital signaldigital broadcastdigital
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 an audio coding format such as AAC+ (MDCT) or MP2, and transmitted using a digital modulation scheme.

Single-frequency network

SFNSingle Frequency NetworkSingle frequency networks
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 signalsDigital signal (electronics)
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.

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.

Subcarrier

subcarrierssub-carrierFM stereo subcarrier
An upgraded version is built into digital radio.

Orthogonal frequency-division multiplexing

OFDMCOFDMOFDM system comparison table
Transmissions use orthogonal frequency-division multiplexing, a technique which is also used for European terrestrial digital TV broadcast (DVB-T).

Software-defined radio

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

Packet radio

PacketAmateur packet radiocomputer networking
Packet radio is a digital radio communications mode used to send packets of data.

High-Efficiency Advanced Audio Coding

AAC+HE-AACeAAC+
In digital broadcasting systems, the analog audio signal is digitized, compressed using an audio coding format such as AAC+ (MDCT) or MP2, and transmitted using a digital modulation scheme.
HE-AAC is used in digital radio standards like DAB+ and Digital Radio Mondiale.

WorldDAB

WorldDMBWorld DMB Forum
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

FCCU.S. Federal Communications CommissionFederal Communications Commission (FCC)
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.

Radio broadcasting

radio stationradio stationsstation
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.
Digital radio broadcasting has emerged, first in Europe (the UK in 1995 and Germany in 1999), and later in the United States, France, the Netherlands, South Africa, and many other countries worldwide.

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.