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The author's link to "a few examples" shows pictures currently transmitted by DAB+. Similarly DRM+ has the capability of sending text and pictures. They are examples of pushing (one way) communication and no interaction. I have illustrated elsewhere on this site the necessity for such information to be up-to-date and whether the broadcaster is willing to provide such textual and graphic services. It may be fine for weather and music information as per example photos because such a service can be automated.
I gave the analogy of the Seven Network abandoning its Teletext service 20 years ago because people can use the web.
Then there's the situation where most DAB+ radio units do not have a graphic display. Even basic DRM receivers don't have graphics.
The idea of user interaction of downloading a product or podcast or purchasing a product or podcast or a hyperlink to a website connotes that DAB+ and DRM receivers: (i) have to have software at the tx and rx updated to permit embedded 'html' or 'php' or 'jsp' pages and hyperlinks and (ii) the DAB+ and DRM receiver be connected to the internet via a 'cable' or part of a 3G/4G/5G internet service.
I can see a quirk with graphically-enhanced and embedded-link-enhanced if such technology is available on a mobile phone. It would be totally useless to transmit QR codes if your source of broadcast is on your mobile phone and you cannot take a photo of the QR code with the mobile phone's camera.
Just a thought,
Thank you,
Anthony of exciting Belfield.