Digital Radio Mondiale, commonly known as DRM, is set to revolutionize broadcasting for short, medium, and long wave bands. Since inception, these wave bands have been filled with signals that can be amplitude modulated. These transmissions are low in quality and these days, there has been a move away from these bands in order to find higher quality transmissions. In the VHF FM band, broadcasts have received more listeners that audience figures are dropping for AM broadcasting. Today, DAB Digital Radio comes in several countries, and it has set new standards in broadcasting.
Now, the next thing is to enhance the transmissions in the long medium as well as short wave bands. As the needs are unique to those experienced on the higher frequencies, the DAB standard is not applicable, and it results in a totally new system that has been developed. DRM receiver offers several improvements that are badly needed along with the flexibility to allow for future developments.
DRM: An Overview
DRM is a group of broadcasters, equipment manufacturers, network operators, broadcasting unions, regulatory bodies, and other organizations that represent 29 countries. It was founded in the year 1998, in Guangzhou, China. Today, it’s headquartered is in Geneva. With 82 members, the base of its membership has been part of the reason for its success. It has the ability to draw on the experience of the membership in order to make sure that the resulting standard met the requirements.
In addition to this, it has drawn on the experience gained by the Eureka project that was established to develop DAM Digital Radio. This new system has come to fruition remarkably swiftly. This system was designed as well as tested within a lab and later extended to include field trails on the air in order to make sure that the new system would successfully meet all the needs and requirements.
The DRM System
Digital Radio Mondiale comes with several key requirements needed to meet. The main thing of the development was to make sure that far greater audio quality could be achieved, but this needed to achieve whilst keeping the transmission in a form where they can operate with the existing AM transmissions. It means having the ability for the transmissions in order to occupy a wide variety of bandwidths dependent on the location as well as frequencies in use.
In the Americas, 10 KHz channel spacing is used, whereas in Europe, 9 KHz channel spacing is used. Talking about short wave bands, 5 KHz channel spacing has been adopted. It is important for the new standard to be able to be compatible with them and offer other bandwidth options for the future.
Data can be transmitted. This supply information is needed for decoding the signal. It also enables data to be transmitted in order to support the program. The most useful feature for the short wave bands is that a list of alternative frequencies is transmitted. This allows listeners to be transferred to better channel easily and conveniently. The next advantage is that it supports a single frequency network (SFN). It allows a single frequency to be re-used within the coverage area of the first transmitter without mutual interference. Today, frequencies can be re-used outside the coverage area of the first transmitter in order to avoid interference problems. With the help of a single frequency network, more efficient use can be made of the available channels. With spectrum bandwidth, this is another important aspect.