What is DAB:
DAB is Digital AudioBroadcasting short, following the AM, FM broadcasting traditional analog broadcasting after the third generation. This new transmission system anti-jamming performance, can eliminate the signal transmission of noise and distortion, while the transmission error occurs can also be modified in order to provide CD-quality stereo; digital transmission system needs to transmit power and small, help save energy and reduce electromagnetic pollution, improve environmental protection; this new system is a multimedia broadcasting system, both can be used to send voice broadcasts, and can transmit data services, such as still and moving images; This system not only can be fixed and portable reception, mobile reception can be. Although still the wireless transmission, but after treatment by digital technology, broadcasting signal was close to CD quality sound, and unparalleled ability to resist interference. When we received these analog FM or AM signal, in fact, the main signal has been encountered in the course of transmission building, trees, mountains and other obstacles are weakened. But the DAB transmission technology to significantly alter this effect, for two reasons: to transmit digital signals are too, paste in the serial in the process of reducing the loss of the signal source; other DAB receivers that has the smart computer chips that can the signal from the messy thicket of identification required numerous digital signal, and to enlarge further play. Therefore, even if you're in downtown centers, or to close buildings can also listen to the DAB radio perfect. Each digital radio with a single band, can load all the radio channels, thus optimizing energy, clean room with very good electromagnetic effects. And digital technology can transmit signals in addition to audio information, the also carry text, picture messages, both the signal sender or recipient, the multimedia communication with each other built up a bridge and a new step for the future development of viable technologies to provide broadcasting services basis. China and the world keep pace DAB digital radio
DAB (Digital AudioBroadcasting) technology in 1980 in Munich, Germany, has experienced ups and downs Ke Hum development into 2004, the external factors of the sudden push to make DAB application suddenly spread from small-scale experiments to the world - from Europe, the United Kingdom and Germany, to North America, Canada and the United States, even in Asia, Singapore, South Korea and China, DAB radio is sweeping the world. Sensual simultaneously "listening" technology
According to the current popular saying, DAB is the era of audio transmission from analog to digital migration arising from the product of the times, it is also AM and FM after following the advent of third generation radio system. But even more interesting is that, relying on DAB, theoretically you can use the eyes to "listen" broadcast - because of the digital features, DAB can transmit signals of any text or even images. DAB radio so you can connect with the TV in order to restore the digital signal in the video image. In this sense, DAB has not a just a pure audio signal transmission system of the broadcast. Even in radio quality, compared with analog radio, DAB radio also has a great advantage. DAB broadcast signal to noise ratio at least 95db or more coding rates reached more than 192Kbps, which has more than most of the MP3 sound quality standards. With digital signal transmission and because the disturbance and the characteristics of wave attenuation, DAB radio is very suitable for the mobile environment in the intense use, such as car. The experience on the use, DAB radio and traditional AM / FM totally different. DAB radio only requires the user to remember a very limited number of bands can be - each band is a specific integrated radio, each station can also set up 5-6 in the frequency band channels. For a classical music lovers, listen to DAB radio typical steps are: transferred to the radio (such as BBC) where the "broadcast frequency", and then into their music under the sub-channels and eventually into the classical music channel, as Open the menu the same.
In fact, DAB has become the United Kingdom and other Western European countries, digital audio broadcasting standard. At present, the greatest impact of a DAB standard is commonly known as "European regulations" of the Eureka-147, but its use is not confined to Europe. In addition, the United States developed IBOC (In-Band On-Channel) and France developed DRM (Digital RadioMondiale) is the world's major technical standards for the two DAB. As a newly established last year in July the signing of DRM standards, the China has become the Union's 30 member. Through cooperation with the European Union, China has established a DAB laboratory in Beijing, and already started building in Guangdong pilot DAB DAB radio network and carried out. Products increasingly rich, fully activate application of fact, although the advent of DAB technology from nearly 25 years now, but it really just into the last 10 years of civil or even something within 5 years, DAB radio has become a significant price reduction in 2003 -2,004 broadcast on DAB in some countries, the rapid spread of the most important factor. DAB radio just launched in Foshan in 1996, China will buy only a Philips DAB radio to provide a model can only receive audio signals, the price is as high as £ 4,200. But since 2003, Britain's most expensive home and car DAB radio prices have fallen to 80 pounds, respectively, and 400 pounds. And Tsinghua University in China is also actively developing domestic-oriented affordable DAB radio. So to speak, to listen to DAB radio's behavior has become a fashion, and to respond to more and more hardware vendors. In this year's CeBIT show, digital audio equipment maker iRiver introduced a model for the iDA-100's DAB radio. Although it supports MP3 and other popular audio file playback, but the battery is only a short period of seven hours, so iDA-100 is indeed to be a "play MP3 supplemented by radio." Also, with Creative sound card manufacturer TerraTec par has also entered the DAB field. In China, apart from two in Guangdong and Beijing DAB applications take the first region, and Tianjin and Henan, have already launched a DAB application. The Philips also launched in China in August of the vehicle can receive DAB broadcast radio.
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