This presentation gives a basics of Digital Radio Mondiale...

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