Digital terrestrial television (DTT, DTV, or DTTV) is a broadcast technology that transmits television signals digitally over the air, replacing analog transmission methods. It has become the primary form of free-to-air broadcasting in many countries, offering improved picture quality and the capacity to carry multiple channels within a single frequency. Reception typically requires a television antenna and a compatible receiver, such as a HD/UHD TV or set-top box.
The conversion from analog to digital broadcasting, known as the digital transition or analog switch-off (ASO), began with experimental transmissions in the 1990s. By the mid-2000s, many governments had established timelines for phasing out analog signals, with deadlines for the changeover, often including subsidies for equipment upgrades and limited exemptions for remote areas. Regional technical standards differ widely. North America and South Korea developed ATSC 1 and ATSC 3.0, while Europe and most of Africa and Oceania primarily use DVB-T and DVB-T2. Japan and much of Central and South America adopted ISDB-T and ISDB-Tb, and China operates the DTMB standard. Some of these standards also support mobile reception and interactive features. By late 2024, the International Telecommunication Union and DVB/EBU reported that more than 160 countries had completed their DTV transition, while some states were still in various transition phases.
Digital terrestrial television continues to play an important role in global media distribution. It is particularly significant for audiences who rely on it for regional news and live sports, despite competition from multichannel video programming distributors (MVPD)s and the rapid growth of over-the-top streaming (OTT) services. Several countries are adopting newer standards that offer improved video resolution and add functions that link over-the-air signals with online platforms. Additionally, over-the-air television is also used to carry pertinent emergency alerts during natural disasters and other crises.
Transmission
Digital terrestrial television is transmitted using radio frequencies through terrestrial space in the same way as the former analog television systems, with the primary difference being the use of multiplex transmitters to allow reception of multiple services (TV, radio stations or data) on a single frequency (such as a UHF or VHF channel). The amount of data that can be transmitted (and therefore the number of channels) is directly affected by channel capacity and the modulation method of the transmission.
North America and South Korea use the ATSC standard with 8VSB modulation, which has similar characteristics to the vestigial sideband modulation used for analog television. This provides considerably more immunity to interference, but it is not immune to multipath distortion, and also does not provide for single-frequency network operation (which is in any case not a requirement in the United States).
The modulation method used in DVB-T is COFDM, with either 64 or 16-state Quadrature Amplitude Modulation (QAM). In general, 64QAM is capable of transmitting at a greater bit rate, but it is more susceptible to interference. 16- and 64QAM constellations can be combined in a single multiplex, providing a controllable degradation for more important program streams. This is called hierarchical modulation. DVB-T (and even more so DVB-T2) is tolerant of multipath distortion and are designed to work in single-frequency networks.
Developments in video compression have resulted in improvements to the original discrete cosine transform (DCT) based H.262 MPEG-2 video coding format, which has been surpassed by H.264/MPEG-4 AVC and more recently H.265 HEVC. H.264 enables three high-definition television services to be coded into a 24 Mbit/s DVB-T European terrestrial transmission channel. DVB-T2 increases this channel capacity to typically 40 Mbit/s, allowing even more services.
Reception
Digital terrestrial television is received either via a digital set-top box (STB), TV gateway, or more commonly now, an integrated tuner in a television set, that operates on the signal received via a television antenna. These devices often include digital video recorder (DVR) functionality.
Due to frequency planning issues, an aerial capable of receiving different channel groups, like a wideband antenna, may be required if the digital signal multiplexes lie outside the reception capabilities of the originally installed aerial. Indoor aerials are more likely to be affected by these issues.
Digital terrestrial television around the world
DTT broadcasting systems by country
Asia Afghanistan
Afghanistan introduced digital terrestrial television in 2014, beginning with test transmissions in Kabul on four UHF channels in June. Official DVB-T2 broadcasts were launched on 31 August of that year. The initial rollout used GatesAir transmission equipment. As of 2025, digital service is only available in limited areas and analog broadcasts remain widespread. No formal transition plan has been announced.
Bangladesh
Bangladesh launched its first DTH service on 28 April 2016 using ISDB-T/MPEG-4 with GS Group as the service provider. The DTH service is branded as RealVU, and its launch was carried out in partnership with Beximco. GS Group acts as a supplier and integrator of its in-house hardware and software solutions for the operator in accordance with modern digital television standard. RealVU provides more than 120 TV channels in both SD and HD. The digital TV set-top boxes developed by GS Group offer functions such as PVR, time-shifting, and an EPG.
India
India adopted the DVB-T standard in 1999, with initial broadcasts by Doordarshan beginning on 26 January 2003 in Delhi, Mumbai, and other major cities. Analog transmission was discontinued in 2018–2023. Private broadcasters are not permitted to use over-the-air platforms and instead must rely on MVPD and OTT services for distribution.
The network was later upgraded to DVB-T2 and DVB-H, with over 190 high-power and 400 low-power transmitters approved for deployment by 2017. As of 2025, Doordarshan continues to operate DVB-T2 services in 16 cities, including the four major metros. The platform offers free-to-air access to DD National, DD News, DD Bharati, DD Sports, and regional channels. Reception is supported via compatible televisions and mobile devices equipped with DVB-T2 tuners or dongles.
Israel
Israel completed its digital switchover in March 2011, becoming the first country in the Middle East to discontinue analog television. The Idan+ platform, operated by the Second Authority for Television and Radio, provides six SD channels, two HD channels from the Israeli Public Broadcasting Corporation (Kan 11 and Makan 33), and roughly 30 national and regional radio stations.
As of 2025, the system remains in operation using DVB-T and DVB-T2 standards. Legislative changes in 2024 and 2025 expanded the number of available channels and modified regulatory oversight. These reforms included exemptions from distribution fees for commercial broadcasters and proposals to restructure or privatize public broadcasting. Technical upgrades in early 2025 required viewers to adopt DVB-T2 capable devices.
Japan
Japan completed its nationwide transition from analog to digital terrestrial television (DTT) on 24 July 2011, becoming the first Asian country to do so. The Ministry of Internal Affairs and Communications (MIAC) and the DPA set specifications for "simplified DTT tuners" priced under 5,000 yen on 25 December 2007 to facilitate the transition and prevent the disposal of analog-only TV sets. MIAC estimated that up to 14 million traditional analog TV sets would remain in use after the complete transition.
On 20 December 2007, the Japan Electronics and Information Technology Industries Association introduced the Dubbing 10 digital right management system for DTT broadcasting, allowing viewers to copy entire programs up to nine times, with one final transferable copy. The system launched on 4 July 2008 after negotiations with the Japanese Society for Rights of Authors, Composers and Publishers. By March 2008, the DPA reported 32.7 million ISDB-T-capable television sets in Japan, excluding mobile 1seg units, and MIAC reported that 43.7% of households owned DTT compatible receivers, up from 27.8% a year earlier. Full coverage was projected by April 2011.
On 3 September 2009, MIAC announced a tender to procure 5,000–8,000 simplified DTT tuners with remote controls for a city-wide analog-to-digital transition test in Suzu, Ishikawa to be delivered by the end of November. Based on this rehearsal, analog transmissions in Suzu and parts of Noto were suspended for 48 hours between noon on 22 January 2010 and noon on 24 January 2010. On 24 July 2010, at noon, analog broadcasts ended in Suzu and parts of Noto (about 8,800 homes) ahead of the national switchover scheduled for 24 July 2011; MIAC monitored the test to identify transition issues.
As of late 2025, Japan's digital terrestrial television (DTT) system is fully operational, providing nationwide coverage. Over-the-air broadcasts remain popular for reaching audiences, offering news, entertainment, and emergency information. Ultra High Definition (UHD) programming is also available over DTT, allowing viewers to access high-resolution content without internet streaming.
Malaysia
Malaysia began its transition to DTV in January 2014 and was completed in October 2019. The service is operated by MYTV Broadcasting under the myFreeview brand and regulated by the Malaysian Communications and Multimedia Commission (MCMC). As of 2025, myFreeview offers 15 free television channels and six radio stations nationwide. Reception is available via DVB-T2 set-top boxes or digital TVs. The platform remains the country's only free-to-air OTA service, with satellite and IPTV dominating commercial broadcasting. The MCMC has also launched initiatives to modernize broadcast infrastructure, though no major changes have been implemented since the 2019 transition.
Maldives
The Maldives has chosen the Japanese-Brazilian standard ISDB-Tb.
Philippines
The Philippines began its transition to digital terrestrial television (DTT) in 2010 when the National Telecommunications Commission (NTC) announced the adoption of the Japanese ISDB-T International standard. The first fully operational digital TV channel was Channel 49, operated by the religious group Iglesia ni Cristo.
On 11 February 2015, ABS-CBN launched ABS-CBN TV Plus, also known as the "Mahiwagang Blackbox." The digital TV box was initially distributed to viewers of ABS-CBN Channel 2, DZMM, and DZMM TeleRadyo. Digital television transition began on 28 February 2017, with DZOZ-TV of ZOE Broadcasting Network being the first station to permanently shut down analog terrestrial transmissions. The NTC initially aimed to complete the analog switch-off by 2023, but the deadline was extended to 2025 for Mega Manila and 2026 for other regions.
Other broadcasters also launched digital services. Solar Entertainment Corporation introduced Easy TV in May 2018, which ceased operations in September 2019. GMA Network launched the GMA Affordabox in October 2020 and introduced two sub-channels, Heart of Asia Channel and Hallypop. TV5 Network, Inc. launched Sulit TV in September 2021, featuring TV5, One Sports, and RPTV.
As of 2025, the NTC continues to oversee the transition from analog to digital terrestrial television, with ongoing efforts to complete the analog switch-off in Mega Manila and nationwide. It was set announced that analog television to shutdown in November 2026 in Mega Manila.
Singapore
Singapore adopted the DVB-T2 standard in 2012, with monopoly Free-to-air broadcaster Mediacorp offering all seven of its services via DTT in 2013. Mediacorp ended analogue television service shortly after midnight on 2 January 2019.