Mobile phones have become central to everyday life in India and around the world. In India alone, there are more than one billion mobile phone users, and industry data suggests that 76% of radio listeners access radio content through mobile devices rather than standalone radio receivers. At the same time, free-to-air broadcast radio remains an important source of news, entertainment, education, rural connectivity and emergency information.
The question for broadcasters is how to combine the convenience of mobile phones with the reach and efficiency of broadcast radio.
Giving mobile phone users access to free-to-air radio services has long been a goal of the digital radio industry. Mobile phones have become the primary media device for many consumers, making them a natural platform for listening to radio. At the same time, radio broadcasters face growing competition from streaming services, which have become widely available through mobile networks. Streaming undoubtedly offers convenience, but it also introduces costs for both broadcasters and listeners, and is vulnerable to interruption, especially in times of crisis.
For every listener who accesses a radio service via an IP stream, broadcasters incur content delivery costs, while consumers use mobile data. As audiences grow, these costs can increase significantly. Mobile networks can also become congested during emergencies, major sporting events and large public gatherings. In some rural areas, coverage remains limited.
For these reasons, broadcast radio continues to offer advantages as a mass-distribution platform capable of reaching large audiences simultaneously.
A different approach to mobile reception
Digital Radio Mondiale services can be transmitted in the FM band, other VHF bands and on medium-wave and shortwave frequencies. The standard supports features including xHE-AAC audio coding, Journaline text information, graphics and Emergency Warning Functionality (EWF), which can deliver emergency alerts and instructions to listeners.
One of the challenges for DRM adoption has been how to bring these services to mobile phones without requiring manufacturers to redesign handsets or add dedicated radio hardware. A possible solution is to move the DRM receiver from the mobile phone to accessories that many consumers already use every day.
Using this approach, the DRM receiver chip is integrated into a Bluetooth-enabled accessory such as a wireless neckband, headphone control module or earbud charging case. The accessory receives and processes the DRM signal and transfers the audio and data to the mobile phone via Bluetooth. The mobile phone itself runs a companion application that controls tuning and service selection while displaying Journaline text, graphics, emergency information and program guides.
This approach is based on a simple premise: Rather than asking consumers to purchase new mobile phones, it uses accessories that are already widely adopted. Wireless earbuds, Bluetooth neckbands and similar products have become mainstream consumer devices. By incorporating DRM reception into these accessories, digital radio services could potentially become available on a broad range of existing mobile phones without any hardware modifications.
A broadcast ecosystem
The mobile phone remains the user interface, providing access to station information, text services and audio playback through its screen, speakers and connected audio devices. From a technical perspective, the radio reception and signal-processing functions are handled by the accessory, reducing the processing burden on the mobile phone.
Low-power DRM receiver chipsets, such as the DRM1000 from CML Microsystems, enable the concept. The chipset is designed for integration into accessories, including Bluetooth neckbands, headphone modules, earbud charging cases and portable speakers. For the companion application, CML is working with Fraunhofer IIS, another member of the DRM Consortium. The application is based on Fraunhofer’s MultimediaPlayer Radio App platform and is designed to detect compatible DRM-enabled accessories automatically via Bluetooth.
The result is an ecosystem in which the broadcast receiver, Bluetooth connection and mobile phone application work together to provide access to DRM services. The discussion is not simply about adding another chip to another device. The broader question is how digital broadcast radio can remain easily accessible in a world increasingly dominated by app-based media consumption.
By shifting the receiver into a Bluetooth accessory while using the mobile phone as the display and control interface, DRM proponents believe digital radio can reach audiences without requiring changes to mobile phone hardware.
Whether this approach gains market acceptance remains to be seen. However, it offers one possible route for bringing digital broadcast radio services to the mobile devices that billions of people already carry every day.
The author is chairman of the DRM Consortium.
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