The “DRM30’ modes DRM can deliver FM-comparable sound
quality and are specifically designed to utilise the AM broadcast bands
below 30MHz (Long Wave, medium Wave and Short Wave) which allow for
very-long-distance signal propagation. All India Radio (AIR) has adopted the DRM standard for digital terrestrial radio transmissions in the MW and SW bands
DRM system has been designed to allow
suitable analogue transmitters to be modified to switch easily between
digital and analogue broadcasts. This can significantly reduce the
initial investment cost for a broadcaster. An additional budgetary
benefit is the reduction of transmission energy costs.
DRM30 uses the existing AM broadcast frequency bands and is designed to fit in with the existing AM broadcast band plans, based on signals of 9 kHz or 10 kHz bandwidth. It also has modes requiring only 4.5 kHz or 5 kHz bandwidth, and modes that can take advantage of wider bandwidths 18 kHz or 20 kHz.
DRM exploits the unique propagation properties of the AM
bands. The introduction of DRM30 services allows a broadcaster to
provide listeners with significantly improved audio quality and service
reliability. As a result, international broadcasters can provide
services on SW and MW that are comparable to local FM services, whilst
enhancing the listener experience with easier tuning and added data
services.
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