A report on Digital television transition

World map of digital television transition progress:
 Transition completed; all analogue signals terminated
 Transition partially completed; some analogue signals terminated
 Transition in progress; broadcasting both analogue and digital signals
 Transition has not been planned or started, or is in early stages
 No digital switchover planned, broadcasting both analogue and digital signals
Analog closedown warning broadcast in Finland.
Analog closedown warning broadcast in Spain
Analog closedown warning broadcast in Japan.
Analog closedown warning broadcast in Brazil.
Analog closedown warning broadcast in Indonesia.
A image taken from the 2009 DTV transition in the U.S

Process in which older analogue television broadcasting technology is converted to and replaced by digital television.

- Digital television transition
World map of digital television transition progress:
 Transition completed; all analogue signals terminated
 Transition partially completed; some analogue signals terminated
 Transition in progress; broadcasting both analogue and digital signals
 Transition has not been planned or started, or is in early stages
 No digital switchover planned, broadcasting both analogue and digital signals

19 related topics with Alpha

Overall

DTT transmitters located at Mount Zhentou in Tainan, Taiwan

Digital terrestrial television

7 links

Technology for terrestrial television in which land-based (terrestrial) television stations broadcast television content by radio waves to televisions in consumers' residences in a digital format.

Technology for terrestrial television in which land-based (terrestrial) television stations broadcast television content by radio waves to televisions in consumers' residences in a digital format.

DTT transmitters located at Mount Zhentou in Tainan, Taiwan
DTT broadcasting systems by country
Two digital terrestrial television receiving antenna on the roof, upper antenna facing Tokyo Tower and lower one to another Local Television Stations in Kantō Plain of Japan until Tokyo Skytree operates. (For ISDB-T system)
Simple and low cost ISDB-T Set-top box (tuner) with remote control
Analog television shut down in Japan at noon. All television stations broadcast a blue information screen that displayed one or more telephone numbers for digital television inquiries on the day of the shutdown until the transmitters shut off at midnight.
World map of digital television transition progress.
Legend:
Transition completed, all analog signals terminated
Transition completed for full-power signals only; LPTV stations still being broadcast in analog
Transition in progress, broadcasting both analog and digital signals
Transition not yet started, broadcasting analog signals only
No information available

Test broadcasts began in 1998 with the changeover to DTTV (aka Analog Switchoff (ASO), or Digital Switchover (DSO)) beginning in 2006 and is now complete in many countries.

ATSC standards logo

ATSC standards

3 links

American set of standards for digital television transmission over terrestrial, cable and satellite networks.

American set of standards for digital television transmission over terrestrial, cable and satellite networks.

ATSC standards logo
Digital terrestrial television broadcasting systems. Countries using ATSC are shown in orange.

Several former NTSC users, in particular Japan, have not used ATSC during their digital television transition, because they adopted their own system called ISDB.

A map depicting digital terrestrial television standards

Digital television

6 links

Digital Video Broadcasting (DVB) uses coded orthogonal frequency-division multiplexing (OFDM) modulation and supports hierarchical transmission. This standard has been adopted in Europe, Africa, Asia, and Australia, for a total of approximately 60 countries.

Digital Video Broadcasting (DVB) uses coded orthogonal frequency-division multiplexing (OFDM) modulation and supports hierarchical transmission. This standard has been adopted in Europe, Africa, Asia, and Australia, for a total of approximately 60 countries.

A map depicting digital terrestrial television standards
Comparison of image quality between ISDB-T (1080i broadcast, top) and NTSC (480i transmission, bottom)

However, after the transition of many countries to digital TV, no portable radio manufacturer has yet developed an alternative method for portable radios to play just the audio signal of digital TV channels; DTV radio is not the same thing.

Early monochrome analog receiver with large dials for volume control and channel selection, and smaller ones for fine-tuning, brightness, contrast, and horizontal and vertical hold adjustments

Analog television

3 links

Original television technology that uses analog signals to transmit video and audio.

Original television technology that uses analog signals to transmit video and audio.

Early monochrome analog receiver with large dials for volume control and channel selection, and smaller ones for fine-tuning, brightness, contrast, and horizontal and vertical hold adjustments
Raster scanning is performed from left-to-right and top-to-bottom. Once the screen has been scanned, the beam returns to the beginning of the first line.
Close up image of analog color screen
NTSC composite video signal (analog)
A waterfall display showing an 20ms long interlaced PAL frame with high FFT resolution
Portion of a PAL videosignal. From left to right: end of a video line, front porch, horizontal sync pulse, back porch with color burst, and beginning of next line
Color bar generator test signal
Color signals mixed with the video signal (two horizontal lines in sequence)
Test card showing "Hanover bars" (color banding phase effect) in the PAL-S (simple) signal mode of transmission.
Beginning of the frame, showing several scan lines; the terminal part of the vertical sync pulse is at the left
PAL video signal frames. Left to right: frame with scan lines (overlapping together, horizontal sync pulses show as the doubled straight horizontal lines), vertical blanking interval with vertical sync (shows as brightness increase of the bottom part of the signal in almost the leftmost part of the vertical blanking interval), entire frame, another VBI with VSYNC, beginning of the third frame
Analyzing a PAL signal and decoding the 20ms frame and 64µs lines

Motivated by the lower bandwidth requirements of compressed digital signals, beginning in the 2000s, a digital television transition is proceeding in most countries of the world, with different deadlines for the cessation of analog broadcasts.

Analog television encoding systems by nation; NTSC (green), SECAM (orange), and PAL (blue)

NTSC

4 links

Introduced in North America in 1954 and stayed in use until digital conversion.

Introduced in North America in 1954 and stayed in use until digital conversion.

Analog television encoding systems by nation; NTSC (green), SECAM (orange), and PAL (blue)
NTSC 1953 colorimetry color cube (color profile encoded, requires a compatible browser and monitor for accurate display).
SMPTE C color cube (color profile encoded, requires a compatible browser and monitor for accurate display).
Spectrum of a System M television channel with NTSC color
The SMPTE color bars, an example of a test pattern

All the countries using NTSC are currently in the process of conversion, or have already converted to the ATSC standard, or to DVB, ISDB or DTMB.

DTT broadcasting systems. Countries using ISDB are shown in green.

ISDB

4 links

Japanese broadcasting standard for digital television (DTV) and digital radio.

Japanese broadcasting standard for digital television (DTV) and digital radio.

DTT broadcasting systems. Countries using ISDB are shown in green.
Treeview of ISDB-T, channels, Segments and arranging multiple program broadcasting.

This service used the VHF band, 207.5–222 MHz which began to be utilised after Japan's switchover to digital television in July 2011.

DVB-T2 test modulator developed by BBC Research & Development

DVB-T2

3 links

Abbreviation for "Digital Video Broadcasting — Second Generation Terrestrial"; it is the extension of the television standard DVB-T, issued by the consortium DVB, devised for the broadcast transmission of digital terrestrial television.

Abbreviation for "Digital Video Broadcasting — Second Generation Terrestrial"; it is the extension of the television standard DVB-T, issued by the consortium DVB, devised for the broadcast transmission of digital terrestrial television.

DVB-T2 test modulator developed by BBC Research & Development
Spectrum of a DVB-T2 signal (8 MHz channel)
DVB-T2 at a glance
Framing structure of DVB-T2
European countries by DVB-T(2) standard in 2017

Ofcom published its final decision on 3 April 2008, for HDTV using DVB-T2 and H.264: BBC HD would have one HD slot after digital switchover (DSO) at Granada.

A digital TV converter box

Digital television adapter

2 links

Television tuner that receives a digital television (DTV) transmission, and converts the digital signal into an analog signal that can be received and displayed on an analog television set.

Television tuner that receives a digital television (DTV) transmission, and converts the digital signal into an analog signal that can be received and displayed on an analog television set.

A digital TV converter box

Because the DTV transition did nothing to reduce the number of broadcast television system standards (and in fact further complicated them), and due to varying frequency allocations and bandplans, there are many other combinations specific to other countries.

An example of the NTIA converter box $40 subsidy "coupon", which is in the form of a bank card that can only be used as payment for a converter box purchase.

Coupon-eligible converter box

2 links

Digital television adapter that met eligibility specifications for subsidy "coupons" from the United States government.

Digital television adapter that met eligibility specifications for subsidy "coupons" from the United States government.

An example of the NTIA converter box $40 subsidy "coupon", which is in the form of a bank card that can only be used as payment for a converter box purchase.
A digital TV converter box

The subsidy program was enacted to provide terrestrial television viewers with an affordable way to continue receiving free digital terrestrial television services after the nation's television service transitioned to digital transmission and analog transmissions ceased.

DTT broadcasting systems. Countries using DTMB are shown in purple.

Digital Terrestrial Multimedia Broadcast

2 links

Digital TV standard for mobile and fixed devices, developed in the People's Republic of China.

Digital TV standard for mobile and fixed devices, developed in the People's Republic of China.

DTT broadcasting systems. Countries using DTMB are shown in purple.

2020-2021 analog switchoff