Digital Radio Mondiale (DRM) is a global open digital radio standard developed as an improvement over analog AM broadcasting which suffers from low audio quality, interference, fading, and high operating costs. DRM converts audio to digital, multiplexes it with other data, applies channel coding for transmission robustness, and modulates the coded data onto radio frequencies, offering better audio quality, signal-to-noise ratio, and less distortion than analog AM radio.

1. Digital Radio Mondiale

2. Digital Broadcast Standards
• Digital Audio Broadcasting (DAB)
• Digital Radio Mondiale (DRM)
• Digital Multimedia Broadcast (DMB)
• Digital Audio Radio Service (DARS)
• High Definition Radio (HD Radio)
• Sirrius & XM Satellite Radio
• Worldspace Radio

3. Current use of AM Band
• LW – Uses ground wave for its extensive
coverage using single transmitter
• MW – In addition to ground wave, sky wave is
used for national coverage
• SW – Facilitates international broadcasting by
using sky wave propagation

4. Ground wave & Sky waves

5. Why DRM?
• Current AM broadcast have very low quality
audio
• High effects of interference and fading
• Frequent change of frequencies, who may find
receiver difficult to tune
• High power consumption
• High cost of operation

6. What is DRM?
• Digital Radio Mondiale (DRM) is a global open
digital radio standard for LW, MW, SW –
called DRM 30, DRM currently covers the
broadcasting bands below 30 MHz
• Originally developed as a digital broadcast
standard for the AM bands using similar
techniques developed for DAB
• DRM's success in standardization and
regulation with the IEC, ITU and ETSI

7. DRM System Overview

8. Main Processes
• The audio signal must first be converted to
digital form also called Source Coding
• The source coded data is then multiplexed
with any other data that is required
• The multiplexed data of the payload is
subjected to Channel Coding to increase its
ruggedness
• The channel coded data is modulated onto RF
signal for transmission

9. Block Diagram

10. DRM Frame

11. Conclusion
• It offers a dynamic improvement in audio
quality
• Better Signal to Noise Ratio (SNR)
• Less multipath distortion
• Automatic tuning
• Single frequency networks
• Auxiliary data services