Radio of the future – what is it? Overview of New Technologies
In historical terms, the radio appeared recently, only about 100 years ago. However, during this time, technology has changed dramatically – from spark transmitters Popov and Marconi to modern handheld FM transmitters with an SD card. But no less interesting is that now broadcasting technologies are at a new round of development, perhaps even more significant. It is possible that after another 100 years (and maybe earlier), turning on the grandfather’s receiver, you won’t be able to catch anything at all, since the broadcasting standards will be completely different. However, first things first. Some technologies already used in the latest generation of radio receivers will be discussed in this article. Direct-sampling, or “direct digitization” This technology has appeared relatively recently, but its prospects are enormous. As you know, radio waves are electromagnetic waves of different frequencies. In the simplest case, the input circuit of the receiver is an oscillating circuit tuned to the frequency of the station. It would seem that little can be changed. However, you can! It is enough to digitize the input stream coming from the antenna, and all further processing and signal extraction can be done programmatically. mytarget The main difficulty of such devices is the need for a very high digitization frequency, which should be tens of megahertz, but these problems are being successfully solved today, such devices have already appeared on the market. Unlike the “grandfather” apparatus, in such a receiver there will be neither coils, nor tuning knobs – only an antenna and several microcircuits. All decoding of the signal is performed by the program in the built-in processor, which gives considerable opportunities for sound processing. And in order to support new broadcasting standards in such a receiver, it will be enough just to update the “firmware”. Moreover, such a receiver can receive several stations at the same time, for example, play music from one, and simultaneously record news from the other into the built-in memory, the possibilities are limited only by the processor power and the imagination of programmers. Receivers of this type are already on the market, but so far only used by professionals for short-wave broadcasting, their price is high and amounts to about 1000 euros. However, once a mobile phone cost a comparable amount … Internet radio Internet radio stations have existed for a long time, but at first they were intended exclusively for users of personal computers. However, in recent years, a large number of devices have appeared to replace the usual desktop radio. For example, a commercially available radio from Logitech. This receiver connects to the network through a regular network connector. There is also Wi-Fi, and the receiver can work wirelessly. But he doesn’t have a “classic” radio path for receiving AM or FM at all. However, this receiver does not need a radio path – the built-in catalog of free access to more than 7000 stations of various genres, plus support for the services of Pandora, Napster, etc. – this is more than enough to find programs for every taste. If desired, the receiver can play music from the local network. Given that the Internet in every home is already a reality, we can confidently say that such a radio is the future. And in the near future, probably, besides radio, it’s possible to watch TV over the Network … Internet radio receivers are already available on the market, their price is from 200 to 500 $. DRM (Digital Radio Mondiale) Despite all the advantages of modern technology, there are still many places on earth that are not covered by either broadband internet or the coverage of FM stations. Specifically for such places, the DRM broadcast standard was developed, which provides pure digital sound transmission on “ordinary” short waves. As you know, short waves are able to go around the entire globe, and they can be received at the most remote point from civilization in the world. The DRM standard uses digital coding with redundancy, it allows, despite the interference, to transmit not only sound, but even images and texts. This standard is already in use, even Russian-language programs are transmitted with its help, for example, the Voice of Russia radio station. There are also foreign stations – “BBC”, “Deutsche Welle”, etc. However, receivers of this type have not been widely used in our country, first of all, because of the high price and the still small volume of broadcasting. It is unlikely that this standard will be popular, but it is likely to occupy a certain niche. In general, it is difficult to say that it will not only be in 100, but even in 20 years. It can be assumed with sufficient confidence that the broadcast will be digital, it is very likely that the user himself will be able to request the compositions or news blocks that interest him. It is also no less likely that some of the channels will be paid, it is also possible that advertising will be shown to users taking into account their tastes and individual preferences.