HD radio

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HD Radio is a proprietary, digital radio system that was developed to complement Digital Audio Broadcasting ( DAB ) in the United States . In North America , the system is now standard on FM and medium wave broadcasts in the United States .

Development and technology

The unofficial, technical name for HD radio is: IBOC for "In-band-on-channel". The standard was developed by the company iBiquity, which was founded for this purpose. A feature of HD radio is that, unlike DAB, it not only works digitally, but can also be operated as a hybrid system at the same time as analog medium-wave and VHF radio . However, this increases the frequency requirement and this could lead to interference from adjacent channels. In Europe, a channel spacing of 100  kHz is common on ultra-short wave (VHF) , while in the USA it is 200 kHz.

If HD radio is broadcast on 107.9 MHz, the upper digital sideband is in the aeronautical radio range , which would actually violate Article 4.4 or 4.5 of the World Radio Treaty.

Medium wave

Thanks to a technique of replication and frequency band expansion using HDC + SBR codecs, it is also possible to transmit tones up to 15,000 Hz to medium wave. This enables data to be transmitted at 40 or 60 kbit / s using an AM signal. Most HD AM stations use a more robust 40 kbit / s transmission mode that has redundancies.

The larger frequency range in hybrid mode leads to a greater frequency requirement of the transmitters and in some cases to interference on the adjacent channels. The first formal complaint came from the US broadcaster WYSL in Avon, New York (25 kW on 1040 kHz) about impairments by WBZ in Boston (50 kW clear channel on 1030 kHz).

distribution

Germany

In Germany, the system is not being marketed in favor of DAB or DAB +. A nationwide introduction of DAB has been postponed several times.

In 2007, the Baden private broadcaster Radio Regenbogen and the network operator Media and Broadcast from T-Systems carried out the first nationwide field test with the HD radio standard. The service was switched to the frequency of Radio Regenbogen 102.8 MHz and the special interest channels Rainbow Gold and Rainbow Comedy were also broadcast. The service has now been discontinued.

North America

In the USA and Canada, HD radio is now standard. The approximately 21,000 radio stations in the USA now broadcast almost all of them - regardless of whether they are FM or AM stations - in this format. Thanks to the possibility of simulcasting on the HD channels, many have split their program into several sub-programs. HD radio is also widespread in Mexico.

Philippines

The first station began broadcasting the program on HD radio in November 2005. By 2018, the number of stations rose to a total of 18 in the three largest cities of Manila, Cebu and Davao.

Switzerland

In May 2006, Bakom in Switzerland granted approval for an HD radio field test to test its suitability for European conditions. Swiss private radio stations pushed the initiative forward. The planned start-up for September 1, 2010 has been postponed indefinitely. Radio Argovia, Radio Basel , Capital FM, Radio 24 and Radio Sunshine wanted to broadcast an HD radio offer. No station in Switzerland is currently broadcasting on HD radio (as of 2019).

Romania

Since August 2012, several programs of the SBS Broadcasting Group in Bucharest have been broadcast on the frequency 100.6 MHz in HD radio.

See also

Web links

Commons : HD Radio  - collection of pictures, videos and audio files

Individual evidence

  1. ↑ http://search.itu.int/history/HistoryDigitalCollectionDocLibrary/1.43.48.en.101.pdf Radio Regulations, edition of 2016: Volume 1: Articles - 1.43.48.en.101.pdf
  2. ↑ Radio Regenbogen and T-Systems are testing HD radio . ( digitalfernsehen.de [accessed January 15, 2017]).
  3. ↑ Mexico - HD Radio. Xperi, accessed June 21, 2019 (Spanish).
  4. ^ The Future of HD Radio In The Philippines. RadioOnlineNow, July 19, 2011, accessed on July 21, 2019 .
  5. ^ HD Digital Radio Going Strong in Philippine Radio, Asia and Europe Go All In on DAB. RadioOnlineNow, June 20, 2018, accessed on July 21, 2019 .
  6. ↑ Trial operation. Retrieved July 30, 2019 .
  7. ↑ Premieră în România: Kiss FM, Magic FM, Rock FM şi One FM s-au lansat în sistem HD. Mediafax, August 9, 2012, accessed June 21, 2019 (Romanian).