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Z.B. If you are still having problems, it is possible an unwanted signal is the cause. Radio 5 Live Sports Extra has a dynamic schedule. AAC+ uses a modified discrete cosine transform (MDCT) algorithm. It rents space on commercial multiplexes to distribute Nations and Local radio stations. The telescopic aerial fitted to stereo portables is a compromise and the radio will often only give really good results if connected to an external aerial. in different rooms of a house) will hear a mixture when both receivers are within earshot. A signal amplifier should only be used as a last resort when the television signal is weak. See how weather can affect Freeview reception. This is because the power used is lower, and is forced to work outside of its normal operating parameters, resulting in electrical impulse interference. Our DAB installation guide provides further information. This means that built in clocks in receivers can be precisely correct. In cities such as London with large numbers of unlicensed radio stations broadcasting on FM, this means that some stations can be reliably received via DAB in areas where they are regularly difficult or impossible to receive on FM because of interference from unlicensed radio stations. At 192 kbit/s, it is relatively easy to hear imperfections in critical audio material. There are all kinds of aerials available on the market and some which are specific to certain frequencies. The BBC cannot recommend individual installers. However, thanks to increased integration (radio-on-chip), DAB receiver power usage has been reduced dramatically, making portable receivers far more usable. If using a hi-fi with a wire aerial, again extend as much as possible to get the best signal. With all of these potential causes, it is worth keeping a log for at least two weeks to determine whether there are any patterns or trends to the interference. It is more spectrum efficient than DAB, therefore enabling more radio stations to be broadcast within the same amount of capacity. For more information see our guide on tropospheric ducting. Our sister site, the Radio and Television Investigation Service (RTIS) also has useful information on how to distinguish the difference. If you get hiss when listening to a stereo signal try switching to mono. The RDS system is set up to detect local radio travel news. If you are using a satellite dish to receive your television, you will also need to check the LNB and cap for any signs of water damage. As DAB is not forward compatible with DAB+, older DAB receivers cannot receive DAB+ broadcasts. Make sure you are tuned to the best frequency for your area, as you can often pick up more than one signal. DAB reception may also be a problem for receivers when the wanted signal is adjacent to a stronger one. Das Radio gehört nach wie vor zu den beliebtesten Medien überhaupt. This used up a comparatively large amount of spectrum for a relatively small number of stations, limiting listening choice. This efficiency originates from the ability a DAB network has in broadcasting more channels per transmitter/network. With that said, this can be solved to some degree by combining multiple local stations in one DAB/DAB+ mux, similar to what is done on DVB-T/DVB-T2 with local TV stations. The newer DAB+ standard adopted the HE-AAC version 2 audio codec, commonly known as 'AAC+' or 'aacPlus'. Firstly, poor reception might be down to poor coverage, so it is best to check you are in a DAB coverage area. This normally happens in the summer months, due to high pressure weather conditions in the atmosphere, allowing radio signals to travel further. Große Auswahl an DAB+ Autoradio auf dem Conrad Marktplatz Gratis Lieferung ab 59,50 € Bis zu 3 Jahre Garantie mit kostenloser Kundenkarte möglich These fit between the aerial socket in the wall and your television. Further information is available in our, Television signals can be affected by fine weather including high pressure (atmospherics) and the only solution is to wait for the weather to change, you should, how weather can affect Freeview reception, Water can get into external cables and can cause reception problems. Some sets do this automatically. The original development of DAB was driven by national network operators with a number of channels to transmit from multiple sites. However, the UEP scheme used on DAB results in there is a grey area in between the user experiencing good reception quality and no reception at all, as opposed to the situation with most other wireless digital communication systems that have a sharp "digital cliff", where the signal rapidly becomes unusable if the signal strength drops below a certain threshold. The best thing about a DAB radio is the lack of interference the usual FM radios face. Having few digital channels broadcasting in stereo. To rule this out see our guide on cables and water damage. Depending on the transmitter you are using, your aerial elements will need to be mounted flat (horizontal) or on its side (vertical). However the. [9] As of 2018, over 68 million devices have been sold worldwide, and over 2,270 DAB services are on air. If your radio has the function, it allows you to see the schedule of services on each radio station, the same way you can on televisions. If possible, check the external cable for any signs of damage, such as cracking and tears. If you have a portable radio you will be able to pick up more of the receivable signal if your telescopic aerial is fully extended. If you have an extendable aerial make sure it is fully extended to give the best possible reception. External aerials are also available for FM radio and will significantly improve reception. If you have an older DAB radio, you won’t receive DAB+ stations, but some stations might transmit in both DAB and DAB+ format. Von 2004 an stand für interessierte Verbraucher eine größere Auswahl an DAB-Empfangsgeräten zur Verfügung, womit ein Hemmnis aus den Anfangsjahren aus dem Weg geräumt wurde. [7][8] This work led to the launch of the DAB+ system. DAB receivers have been available in many countries since the end of the 1990s. It has also allowed us to broadcast World Service in the UK and given the whole of the UK access to services such as Asian Network. Error-correction coding (ECC) is an important technology for a digital communication system because it determines how robust the reception will be for a given signal strength – stronger ECC will provide a more robust reception than a weaker form. Use our transmitter tool to see whether your local transmitter is currently affected by maintenance work. If that’s not possible, switch to mono as it will usually sound better. A DAB+ audio signal is encoded in aacPlus (strictly, aacPlus HE v2). A DAB+ radio will receive old-fashioned DAB signals, as well as new DAB+ stations. For further information see our DAB installation guide. Check your radio manual for specific instructions on doing a full re-scan. Assuming a total availability of 102 FM channels at a bandwidth of 0.2MHz over the Band II spectrum of 87.5 to 108.0 MHz, an average of 102/15 = 6.8 radio channels are possible on each transmitter site (plus lower-power local transmitters causing less interference). [7][8] The new standard, which is called DAB+, has also adopted the MPEG Surround audio format and stronger error correction coding in the form of Reed-Solomon coding. A faulty or uncompressed engine can cause a distinct buzzing 'whine' which varies with engine speed - motorcycles tend to be the worst. From an OSI model protocol stack viewpoint, the technologies used on DAB inhabit the following layers: the audio codec inhabits the presentation layer. DAB+ is the most widely adopted digital radio standard worldwide, on-air in more than 40 countries including Australia, United Kingdom, Germany, Italy, Switzerland, France, Norway, Poland, Malta, Denmark, Netherlands, Hungary, Thailand, Vietnam, Malaysia, Indonesia, Tunisia , Qatar, Kuwait, South Africa to name just a few. The useful part of the OFDM symbol period is 1 millisecond, which results in the OFDM subcarriers each having a bandwidth of 1 kHz due to the inverse relationship between these two parameters, and the overall OFDM channel bandwidth is 1,537 kHz. Multiplexed radio stations are then broadcast on single frequency networks. The BBC cannot recommend individual installers. The buzzing and clicking lasts from a few seconds to a minute at a time. A choice of audio codec, modulation and error-correction coding schemes and first trial broadcasts were made in 1990. There are no DAB radio stations that operate in North America as of 2018. as of 2017[update], DMB is currently broadcast in Norway, South Korea and Thailand. Further information is available in our Freeview installation guide. As mentioned earlier, DAB radio is not entirely perfect. deinterleaving) add to the overall delay perceived by the listener. The CAI (Confederation of Aerial Industries) is a recognised trade body which will can put you in touch with one of their members in your area. DAB historically had a number of country-specific transmission modes (I, II, III and IV). In that case, adjacent transmitters use the same frequency. Zwar können herkömmliche Radios Digitalradio nicht empfangen, doch jedes neue digitale Radio mit DAB+ kann seinerseits auch UKW oder den etwas älteren Standard DAB abspielen. This is because your radio will struggle decoding two radio stations on the same frequency. An ensemble has a maximum bit rate that can be carried, but this depends on which error protection level is used. This may mean an electrical item in your home, or nearby, is interfering with your MW/LW radio. Autoradios schalten bei fehlendem DAB+automatisch auf UKW um. To find out if a particular switch is causing the problem, try turning the lights off one at a time. Very occasionally, the weather, usually high pressure, can result in a weakened signal. For national and regional radio networks, the efficiency is improved by more than an order of magnitude due to the use of SFNs. Keeping a note of when each lamp comes on and goes off will help to identify whether this is the cause of your interference. You may need to check that all parts of your receiving system are fully earthed. If your radio displays signal strength, use this as a guide to ensure the best position. Digital audio broadcasting (DAB) is a digital radio standard for broadcasting digital audio radio services in many countries around the world but not in North America where HD Radio is the standard for digital radio. The specialised nature, limited spectrum and higher cost of DAB broadcasting equipment provides barriers to unlicensed ("pirate") stations broadcasting on DAB. Audio Description is a live verbal commentary, providing information which describes the key visual information contained on the screen, which a blind or partially sighted viewer may otherwise miss. use the same radio frequency channel more densely. In January 2017, an updated DAB specification (2.1.1) removed Modes II, III and IV, leaving only Mode I. The DAB multiplexer adds the proper offset to the distributed time information. For information on the, The BBC cannot recommend individual installers. It will also show you any transmitter faults. To get the best reception extend the aerial fully and move the aerial and radio around until you get the best reception. This may mean an electrical item in your home or nearby, is interfering with the reception of your FM radio and is causing the buzzing, clicking or pops you can hear. Firstly, you may have a poor aerial system, so we recommend you checking over your installation by reading our Good installation help guide. An exception is "helically wound" FM aerials. For more information see our guide on, If you normally can receive a service, but you are now finding it is fading, or you can hear hissing, this could be down to one of three things. is a recognised trade body which can put you in touch with one of its members in your area. Our information on h, If you are still having problems, it is possible an unwanted signal is the cause. Please see our help guide on a manual retune. For more information see our guide on, Use our problem assistant to help you diagnose problems with reception and interference, Check the status of the transmitter you are using and find out TV and radio channels and frequencies. [4] The signal is delayed, usually by around 1 to 4 seconds and can be considerably longer for DAB+. Low power gap-filler transmitters can be added to an SFN as and when desired in order to improve reception quality, although the way SFNs have been implemented in the UK up to now they have tended to consist of higher power transmitters being installed at main transmitter sites in order to keep costs down. This can commonly be caused by high pressure when, during fine weather, radio signals can travel much further than normal. While an amplifier provides gain, boosts the signal, an attenuator provides loss, reduces the signal. For more helpful information please see our, Your aerial should be as high as possible pointing towards the transmitter with the best signal. Very occasionally, the weather, usually high pressure, can result in a weakened signal. The second signal is picked up by the radio moments after the first. There is nothing that can be done and the problem will go away when the weather changes. This is known as co-channel interference. This is because the transformer would have been designed to operate at the higher power and not the lower power the LED lights use. For example all the cables between your television equipment and aerial are connected securely and none is damaged. People who have heard DAB digital radio have commented on the significantly better sound quality and "presence" of the new radio system. In Korea, the transmission of MBC 11FM was stopped in 2015 and the DAB channel was switched to T-DMB V-Radio. That multiplex is then subdivided into multiple digital streams of between 9 and 12 programs. However, in both cases the signal will be weakened as it has to pass through various obstructions such as walls, roof tiles, foil backed insulation etc. An electric motor is used in many appliances such as electric lawnmowers, washing machines, drills and hairdryers etc. DAB with 192 kbit/s codec requires 1.536 MHz * 192 kbit/s / 1,136 kbit/s = 0.26 MHz per audio programme. Norway was the first country to announce a complete switch-off of national FM radio stations. Radio 5 Live Sports Extra has a dynamic schedule. Nations and Local radio services are carried on a mix of commercial multiplexes. Later, DAB was developed as a research project for the European Union (EUREKA), which started in 1987 on an initiative by a consortium formed in 1986. We cannot recommend individual installers. For other digital audio broadcasting systems, see, Use of frequency spectrum and transmitter sites, Less unlicensed ("pirate") station interference, orthogonal frequency division multiplexing, Learn how and when to remove this template message, European Telecommunications Standards Institute, countries provide DAB, DAB+ or DMB broadcasts, music radio stations broadcasting in mono, "DAB Eureka-147: a European vision for digital radio", "EBU Viewpoint The future of digital radio", Digital Audio Broadcasting (EBU Technical Review article), Press release: New High Efficiency Audio Option Added for DAB Digital Radio, http://stakeholders.ofcom.org.uk/binaries/consultations/digital-radio-tech-codes/summary/Digital_Radio_Tech_Codes.pdf, "DTG :: News :: DAB Radio launches 18 new stations with Government support", OFCOM: Regulation in digital broadcasting: DAB digital radio bitrates and audio quality; Dynamic range compression and loudness, "BBC R&D White Paper WHP 061 June 2003, DAB:An introduction to the EUREKA DAB System and a guide to how it works", "Ofcom reveals DAB sound quality opinions", "Italy's South Tyrol Begins FM Switch off", Norway is first country to turn off FM radio and go digital-only, Medieprofessor: – Et kritisk øyeblikk for radiomediet, "Regeringen stoppar övergången till DAB-radio", "Digitalradio weiter ausgebaut – UKW Abschaltplan der RAS von der Landesregierung genehmigt", Frygtede for to millioner biler - nu får FM-båndet lov til at overleve, https://yle.fi/uutiset/osasto/news/yle_closes_down_dab_radio_services/5196460, https://www.info.gov.hk/gia/general/201703/28/P2017032800689.htm, http://www.mundodaradio.com/historia/dab_em_portugal.html, "RTÉ to cease radio transmission on DAB network", "A report on market structure, dynamics and developments in Irish media", ETSI EN 300 401 v1.4.1 – original DAB specification, ETSI TS 102 563 V1.2.1 (2010-05) Technical Specification, https://en.wikipedia.org/w/index.php?title=Digital_audio_broadcasting&oldid=1015929188, Articles with dead external links from July 2015, Articles with dead external links from August 2018, Articles with permanently dead external links, Articles needing additional references from February 2011, All articles needing additional references, Articles with unsourced statements from July 2008, Articles containing potentially dated statements from 2017, All articles containing potentially dated statements, Wikipedia articles in need of updating from May 2019, All Wikipedia articles in need of updating, Articles containing potentially dated statements from December 2019, Creative Commons Attribution-ShareAlike License, Mode III for frequencies below 3 GHz, Earth and satellite, Primary services, like main radio stations, Secondary services, like additional sports commentaries. This normally happens in the summer months, due to high pressure weather conditions in the atmosphere, allowing radio signals to travel further. The United States' FCC argues that stations on such a national DAB Band would be more difficult to control from signal interference than AM/FM/TV because of the continent's large land mass; and corporations who sell DAB radio in North America could find it more expensive to market these types of radio to consumers. In the DAB multiplexes we also add some additional service data. Its technical name is multipath distortion. Using values for Transmission Mode I (TM I), the OFDM modulation consists of 1,536 subcarriers that are transmitted in parallel. Attenuators are always a compromise and should only be used if absolutely necessary. 21 April in Trøndelag and Møre og Romsdal (, 16 June in Telemark, Buskerud, Hedmark and Oppland (P4, Radio Norge and local radio), 15 September in Sogn og Fjordane, Hordaland, Rogaland and Agder (P4, Radio Norge and local radio), 8 December in Østfold, Vestfold, Oslo and Akershus (P4, Radio Norge and local radio). If all other stations are working ok and you have just lost one station. The guard interval duration also determines the maximum separation between transmitters that are part of the same single-frequency network (SFN), which is approximately 74 km for TM I. OFDM allows the use of single-frequency networks (SFN), which means that a network of transmitters can provide coverage to a large area – up to the size of a country – where all transmitters use the same transmission frequency. DAB stands for Digital Audio Broadcasting. The sound quality can be noticeably inferior if the bit-rate allocated to each audio program is not sufficient. The best DAB radios are proof that the good old days of radio are still going strong – and the format is a staple for many of us, even as smart speakers take over our homes. See our guide on, The effect that causes radio signals to travel further than normal is known as tropospheric ducting. Note the above capacity improvement may not always be achieved at the L-band frequencies, since these are more sensitive to obstacles than the FM band frequencies, and may cause shadow fading for hilly terrain and for indoor communication. Tijdens de Week van de Digitale Radio tussen 4 en 8 november besteden niet alleen de radiostations aandacht aan de nieuwe uitzendtechniek DAB+, ook de winkels zetten de DAB+ … Below that is the data link layer, in charge of statistical time division multiplexing and frame synchronization. some sounds appearing at the centre of the stereo image need not be sent twice). How can I tell if a radio works with DAB+? As the aerial is directional, by simply turning the radio you will be able to get the best reception. Many Digital radios have a signal strength display which enables you to position the Radio for the best reception (usually a number of blocks) as a guide of reception quality. The time information is also independent from the (possibly varying) audio decoding delay in receivers since the time is not embedded inside the audio frames. Einige hybride Endgeräte, welche das Audio Signal besitzen, verfügen auch über DAB+ sowie Internet. We cannot recommend individual Installers. DAB uses the MPEG-1 Audio Layer II audio codec, which is often referred to as MP2 because of the ubiquitous MP3 (MPEG-1 Audio Layer III). The. The number of transmitter sites or the transmission power required for full coverage of a country may be rather high at these frequencies, to avoid the system becoming noise limited rather than limited by co-channel interference. It is a digital radio service which is broadcast from a UK-wide network of transmitters. If you have a portable radio you will be able to pick up more of the receivable signal if your telescopic aerial is fully extended. Many people are now using low power LED lights instead of the more traditional varieties. You may need to contact your car manufacturer to check. Check any appliance with an electric motor by moving your radio away from it to see whether the sound improves. It may take a little trial and error to find the most suitable one for your installation, and it is worth taking the advice of a local aerial contractor to select the correct one for the installation. To check what coverage of DAB services are available in your locality, please see our Transmitter checker tool. For more information on finding and storing these services, see our Help guide on DAB secondary services. Some aspects of these are described below. This means that they use more energy than analogue Band II VHF receivers. Für 2007 nannte die Universität Bonn eine Zahl von 546.000 DAB-Empfängern in deutschen Haushalten. Weniger anzeigen . If you have an external or loft aerial check they are functioning correctly. From time to time radios should be re-tuned in order to discover new stations. When Radio 5 Live Sports Extra is on air, you should find it right next to 5 Live on the list of stations on your digital radio. In many places, this has led to an increase in the number of stations available to listeners, especially outside of the major urban areas. If you normally can receive a service, but you are now finding it is fading, or you can hear hissing, this could be down to one of three things. An electric motor is used in many appliances such as electric lawnmowers, washing machines, drills and hairdryers etc. However, there are exceptions. In some urban areas Pirate Radio can be a problem. Our information on how clear skies and fine weather can affect your radio reception may be useful, please see our Weather Guide. If you have several appliances with electric motors you may need to turn them all off and try the above one at a time. If you live close to a transmitter or can get a strong TV signal, then it could be possible to use an aerial in your loft or an indoor portable aerial. Check any appliance with an electric motor by moving your radio away from it to see whether the sound improves. Look for a DAB+ logo, or a Digital Radio 'tick', on the box or on the device itself. Contact the Freeview Advice Line on 0808 100 0288, or for further details please see, This may be due to two reasons. This is the budget DAB radio to beat, frankly, offering an excellent affordable option if you just want a simple and great-sounding radio. For more information on how weather can affect your Radio services, please see, It is important to check your installation is working properly and that your radio is in the best possible position. This may be from a socket on the wall or a direct cable through the wall. If you have an external or loft aerial check they are functioning correctly. If not, then you will need to check the radio and aerial to confirm they are both working properly. Most DAB radios can be tuned easily at the touch of a button. Using our Transmitter Checker, check your transmitter is not undergoing any work. DAB reception is rarely disrupted by high-pressure weather conditions, but under some circumstances, signals from very distant transmitters can cause reception to break up, or be lost for periods of time. Even the best amplifier will still add some noise to the television signal it is amplifying/boosting that could result in picture break up. We advise you check that your antenna is able to receive DAB, in the majority of cases you will need a new antenna. The old version of DAB uses punctured convolutional coding for its ECC. If your car radio is showing no signal or no service for a station you usually receive, this could be down to one of the following things: If you know your location, you can use our transmitter checker to see whether there is a problem. Make sure any cables between your radio equipment and aerial are connected securely. The regulator, Ofcom, deals with Pirate Radio and you can report it. We broadcast our DAB multiplex using the same frequency (12B) from a network of transmitters, which is why we describe it as a Single Frequency Network (SFN). However, radios in the fringe of a DAB signal can experience a "bubbling mud" sound interrupting the audio or the audio cutting out altogether. Currently it reports on network DAB stations only; Local and Nations radio faults are not included. The typical bitrate for DAB stereo programs is only 128 kbit/s or less, and as a result, most radio stations on DAB have a lower sound quality than FM, prompting a number of complaints among the audiophile community. It will also show you any transmitter faults. Ideally, this should be on the roof or high up on the outside of the building, though it may also give good results in the loft. However, a small reduction, to 224 kbit/s is often adequate, and in some cases it may be possible to accept a further reduction to 192 kbit/s, especially if redundancy in the stereo signal is exploited by a process of 'joint stereo' encoding (i.e. It uses digital technology which enables broadcasters to package together several radio stations; this is called multiplexing. To rule this out see our guide on, A manual retune is more effective than an auto-retune as it only tunes your television to the transmitter your aerial is pointing towards. Use our transmitter tool, which will tell you what national and local DAB services are available in your locality. This results in a system spectral efficiency of 1 / 15 / (0.2 MHz) = 0.30 programmes/transmitter/MHz. Use our Transmitter Checker to check the transmitter is not undergoing any work and to see which FM radio services you can receive from your location. This combination of Reed-Solomon coding as the inner layer of coding, followed by an outer layer of convolutional coding – so-called "concatenated coding" – became a popular ECC scheme in the 1990s, and NASA adopted it for its deep-space missions. If you are still having problems see our sister site RTIS for further information. Es gibt auch eine optionale Funktion für die Verbindung mit Ihrem WLAN, um im Internetradio-Modus auf Tausende von Sendern zuzugreifen. It is also a more efficient use of spectrum and uses less electricity compared with analogue radio transmission. DAB is an open standard deposited at ETSI. For more information on interference, please see our, Your radio must be in a good DAB coverage area to receive BBC services. If you suspect this - particularly if you are also getting interference on FM - wait until the weather changes. If you are still having problems see our sister site Radio and Television Investigation Service (RTIS) for further information. As DAB requires digital signal processing techniques to convert from the received digitally encoded signal to the analogue audio content, the complexity of the electronic circuitry required to do this is higher. Also, as DAB transmits digital audio, there is no hiss with a weak signal, which can happen on FM. AM reception can vary a great deal from day to night because of differences in the atmosphere. Entdecken Sie den Radiostandard von heute: DAB + steht für Digital Audio Broadcasting und löst das alte UKW ab. A television signal will always lose some of its strength as it passes along the cable and through the connectors. Your iPod uses AAC as standard; aacPlus uses a number of clever techniques to make it more efficient, so audio sounds better at lower bitrates. The first is a fault with the local FM transmitter. The problem could be due to a number of reasons, the station may have stopped broadcasting or have moved multiplexes rather than a radio fault. Use the, These are not recommended unless absolutely required as they can introduce unexpected reception problems. Damaged cables can cause reception problems and can allow water into your installation. A DAB audio signal is encoded in MP2 (the ancestor to today’s MP3 format). The 5 Live Sports Extra schedule is available online, and Radio 4 LW on DAB, broadcasting Yesterday in Parliament, along with the Daily Service each day on their respective websites. This needs to be rotated to find the best signal. a lower code rate) and vice versa. cross-talk. Hiermee is je radio weer helemaal up-to-date, en ontvang je alle beschikbare stations bij jou in de buurt. Although FM coverage still exceeds DAB coverage in most countries implementing any kind of DAB services, a number of countries moving to digital switchover have undergone significant DAB network rollouts; as of December 2019[update], the following coverages were given by WorldDAB:[23].