Description Of Digital Radio Receivers
Traditionally, a radio has been considered to be the box that connects to the antenna and everything behind that. However, most of the system designs are segmented into two separate subsystems: The radio and the digital processor. With this segmentation, the purpose of the radio is to down convert and filter the desired signal and then digitize the information. Likewise, the purpose of the digital processor is to take the digitized data and extract out the desired information. An important point to understand is that a digital radio receiver is not the same thing as digital radio i.e. modulation. In fact, a digital radio receiver will do an excellent job at receiving any analog signal such as AM or FM. Digital radio receivers can be used to receive any type of modulation including any analog or digital modulation standards. Furthermore, since the core of the digital radio receivers is a digital signal processor, this allows many aspects of the entire radio receiver itself be controlled through software. As such, these DSPs can be reprogrammed with upgrades or new features based on customer segmentation, all using the same hardware. Digital drop receivers or down converters are the other names used for the digital radio receivers. Digital radio receivers were brought in at the beginning of 1990s and since then they have become popular in radio communication. The digital radio receivers have three basic and required elements: local oscillator, mixer and filter terms. There are many factors which are considered during the design of a digital radio receiver. These include over-sampling, Processing Gain, under-sampling, Frequency planning/Spur placement, reduction of size, cost, and complexity and improve manufacturing by using digital components to replace unreliable and inaccurate analog components. Many of these provide technical advantages not otherwise achievable with a traditional radio receiver. There are many benefits of a digital radio receiver. Digital radio receivers have better sound quality, which is as good as that of a CD player. Digital radio receivers are easy to tune as there is menu selection provided in these receivers. So there is no need to scroll a wheel like in analog receivers. These receivers are provided with a small LCD screen to select different channels. Digital radio receivers with hard drives will also allow you to break live radio or rewind, just like digital set top boxes or DVD recorders with hard drives do for digital television.
Digital radio receivers are the next generation radios. Loaded with good services, wide ranges of options, crisp and clear reception of signals, text information, graphics, pictures and web pages, digital radio receivers are well established, globally. Unlike analog AM or FM radios, digital radios are much more efficient and a number of stations can be broadcasted within the same frequency spectrum. Digital radio receivers are potentially strong in providing the great choices and specific program formats to the listeners. Digital radio receivers may vary in price and sound formats. These can have any of the two sound formats: stereophonic and surround sound. A high-quality receiver for dedicated audio-only listening can be relatively affordable. Another major feature of digital radio receivers is that some of them can be connected to a television, other components, and/or a set of loudspeakers. |
