We all are familiar with audio broadcasting in different radio stations. But have you heard about digital audio broadcasting? It is a completely new system for broadcasting and receiving radio stations. As the name suggests signals are broadcast in digital format to enable CD quality to be achieved.
Digital audio broadcasting, DAB, is the most basic advancement in radio technology since that introduction of FM stereo radio. In fact DAB is a reliable multi service digital broadcasting system for reception by mobile, fixed and portable receivers with a simple, non-directional antenna. It is operated at any frequency from 30 MHz to 36Hz for mobile reception and may be used on terrestrial, satellite, hybrid and cable broadcast networks.
Digital audio broadcast signals are transmitted in-band, on-channel (IBOC). Furthermore Many stations are often carried within a similar frequency spectrum. Moreover Listeners should have a receiver equipped to handle DAB signals. At the transmitting website, the signal is compressed using MPEG algorithms and modulated using coded orthogonal frequency division multiplexing (COFDM).
A digital signal offers many benefits over typical analog transmission, as well as improved sound quality, reduced multipath and fading effects, increased immunity to weather, noise, and other interference, and growth of the listener base by increasing the number of stations that can broadcast within a given frequency band.
A DAB receiver includes a small display that gives information regarding the audio content in much a similar method that the menu screen provides an overview of programs in digital television (DTV). Also Some DAB stations offer latest news, sports, and weather headlines or bulletins in a scrolled text format on the display. Using the DAB information, it may even be possible to see what song is coming up next.
Do you know what the benefit of using digital broadcasting for audio signals is? Now let us have a look at these:
- Improved signal to noise ratio.
- Reduced interference.
- Less multipath distortion.
- Automatic tuning.
- Possibility of single frequency networks.
- Auxiliary data services.
Here we can see the benefits of digital audio broadcasting:
- Using single frequency network improves mobile reception and no fine-tune of frequency is required.
- Rooted out the issue of interference in AM and FM broadcast.
- Data transmission along with audio broadcast providing text-based information like instant reports on weather, news and traffic information etc.
- More channels are often available in the same frequency spectrum when compared with AM and FM transmissions.
As a matter of fact DAB digital radio is now well established in several countries around the world from the Europe and UK to Canada, Australia and many other countries. With the facilities that digital radio offers it’s currently being accepted and listeners are switching to these new digital radio transmissions in the areas where they’re accessible.
The benefits of DAB are manifolds. Spectrum efficiency is more as fewer spectrums are needed to carry a similar amount of data as compared to the existing analogue broadcasting technique. Also this will benefit the customers by improving competition in the market, widening program choice and improving service quality.0