Commercial digital radio was dealt a major blow last year, following the demise of the planned second national commercial digital radio multiplex, 4 Digital Group.
Lord Carter's Digital Britain report, due out in the summer, is currently working out a road map to improve commercial digital radio provision, for example, by establishing the conditions for digital radio switchover.
Miron said today that the Government has set a "clear and rightfully ambitious programme for digital migration".
However, he said that as Lord Carter's Digital Britain report nears an end, he said he wants "to send them a clear message", adding that "we back digital, and we back the strategy but we cannot afford to get this wrong. The next draft needs to be bolder".
He went on: "Digital Britain has made us focus our minds. Now the Government must focus theirs. We have embarked on a clear path to digital - to DAB - and we need to make serious progress and do it quickly. This means naming a date for migration, with a transparent set of criteria for all the relevant parties to meet.
"Only that certainty will give us the leverage to get the car-makers, the set manufacturers, the multiplexes - and many others - on board. Whatever the date, and we personally believe the earlier the better - a firm date needs to be set."
Miron, speaking at The Guardian's Radio Reborn Conference, also called on the commercial radio industry to be bolder. He said: "While the growth in digital has been driven in no small part by the efforts of many people and organisations in this room, the truth is our industry has, at times, been too slow to embrace change.
"This can't continue. Put simply, the future of our sector is intrinsically linked to the successful implementation of the Government's digital strategy and to the successful migration to DAB."
He added: "We need to get our act together to make the best possible case for consumers to switch to digital. Yes, there are huge infrastructure challenges, but I don't believe these are beyond the collective wit and wisdom of the many talented people here today and working in our sector.
"Global is up for the challenge and, as the largest commercial player, we are prepared to lead this charge.
"But we can't do this alone. It's now down to others to step up to the mark and support us, and the Government, in making this vision a reality."
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