.DRM stands for Digital Radio Mondiale which mondiale means world wide. DRM is a way to deliver Digital Voice broadcast with crystal clear reception , assuming you can receive them over a certain threshold, if under this threshold you recieve nothing.
DRM is the digital radio standard for the long-, medium- and short-wave ranges. The standard was formed by a consortium in co-operation with the International Telecommunication Union (ITU). The system offers the radio stations and new service providers access to the multimedia age with small bit rates for large target areas and long distances. For more information visit www.drm.org
The bandwidth of a DRM bandpass signal is less than 20 kHz and the number of carriers used in the OFDM-modulation is relatively small (max. 460). These features motivate a real-time software implementation of a DRM-receiver on a conventional personal computer (PC) using the sound card as the input and output device. A long, medium and short wave front-end with an intermediate frequency (IF) between 5 kHz and 15 kHz is used to receive the DRM signal. Any commercial front-end with an IF of 455 kHz should be usable by adding a 455 kHz to 12 kHz adaptor (assumed the receiver bandwidth is sufficient for a DRM signal). Documentation of receiver modifications for DRM reception can be found at www.drmrx.org
The DRM system uses COFDM (Coded Orthogonal Frequency Division Multiplex). This means
that all the data, produced from the digitally encoded audio and associated data signals, is
shared out for transmission across a large number of closely spaced carriers Bandwidths can vary from 4.5khz to 20khz. And used MPEG-4 Codec for programming and may use more compressed codecs for voice.
Mode Audio Sample
FFT Window Screenshot
CLICK HERE to hear decoded DRM