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Markymark6,523 posts since 13 Dec 2004
Meridian (North) South Today

Which is how the North American system called 'HD Radio' works (sort of)

https://www.lifewire.com/what-is-hd-radio-534581


Yes, when I was with a friend in the US, I noticed how their radio kept flicking back between the analogue and digital signal when the signal got weak.

Maybe a better system than the DAB one we're using.

It's a bit of a joke how many DAB stations are mono- in 2019.


I'd like to see HD radio used alongside DAB or more likely DAB+, in years to come, it can be used on AM too. But the likelihood of that happening is absolute zero.


It's sub-carriers added to the primary FM or AM analogue carrier. You can't do that with DAB because the COFDM signal is 1700 separte carriers, and you can't have sidebands, different kettle of fish completely.

http://ecee.colorado.edu/~liue/teaching/comm_standards/2011F_HD_Radio/index.html

It works alongside the analogue signal rather like NICAM did on our analogue TV system, and as
observed if the signal reduces to an unacceptable level, the digital output is replaced by the analogue, (which is what happened to NICAM too on weak signals)
Markymark6,523 posts since 13 Dec 2004
Meridian (North) South Today

Which is how the North American system called 'HD Radio' works (sort of)

https://www.lifewire.com/what-is-hd-radio-534581


Yes, when I was with a friend in the US, I noticed how their radio kept flicking back between the analogue and digital signal when the signal got weak.

Maybe a better system than the DAB one we're using.

It's a bit of a joke how many DAB stations are mono- in 2019.


My partner’s car radio somehow manages to flick seamlessly from DAB to FM to prevent signal drop-out on the BBC national stations (and possibly others). I only realised it was happening when I could hear a bit of static on what I thought was DAB. I’ve no idea how it prevents it from jumping when it switches, given the digital delay on DAB - presumably it must have some kind of constant buffer recording to match them up.


Yes ! My car radio does the same, I suspect there are only one or two standard chip sets, so the functionality
is common to most modern receivers.
Inspector Sands13,409 posts since 25 Aug 2004

I'd like to see HD radio used alongside DAB or more likely DAB+, in years to come, it can be used on AM too. But the likelihood of that happening is absolute zero.

Their HD Radio system does have its own limitations, and like DAB it's still possible to cram as many stations into the bandwidth as possible.

Digital radio on MW is broadcast in the UK using the DRM format but only a BBC trial in Plymouth. It differs from HD Radio in that it doesn't run parallel with the analogue broadcsst
Inspector Sands13,409 posts since 25 Aug 2004
My partner’s car radio somehow manages to flick seamlessly from DAB to FM to prevent signal drop-out on the BBC national stations (and possibly others).

Yeah, it's very handy. I guess it's based on the RDS IDs being the same between DAB and FM? I think I've heard it both seamlessly and not (i.e repeats on the way back to DAB) so I wonder if some stations are deliberately delaying FM. Would they really be likely to do that though??

It's very difficult to do that as all the receivers will take different amounts of time to decide the signal. You can have two DAB (or even DVB) receivers in the same room tuned to the same thing and they won't be in sync..

I am pretty sure the BBC stations aren't delayed, Big Ben, when it's working, can be heard on the radio before it can be heard as sound if you're in Westminster Bridge
cityprod1,925 posts since 3 Oct 2005
Westcountry Spotlight

Yes, when I was with a friend in the US, I noticed how their radio kept flicking back between the analogue and digital signal when the signal got weak.

Maybe a better system than the DAB one we're using.

It's a bit of a joke how many DAB stations are mono- in 2019.


I'd like to see HD radio used alongside DAB or more likely DAB+, in years to come, it can be used on AM too. But the likelihood of that happening is absolute zero.


It's sub-carriers added to the primary FM or AM analogue carrier. You can't do that with DAB because the COFDM signal is 1700 separte carriers, and you can't have sidebands, different kettle of fish completely.

http://ecee.colorado.edu/~liue/teaching/comm_standards/2011F_HD_Radio/index.html

It works alongside the analogue signal rather like NICAM did on our analogue TV system, and as
observed if the signal reduces to an unacceptable level, the digital output is replaced by the analogue, (which is what happened to NICAM too on weak signals)


That wasn't quite what I meant, apologies for not making that clear.

I would like to see HD Radio used on the AM & FM wavebands, and DAB+ used on the current DAB band. You could use both technologies simultaneously, as they broadcast in different wavebands. FM is 87.5 to 108, whilst DAB is 176 to 212, so there's space to use both technologies. As I said, it has absolutely zero chance of happening, but I would like to see it.
Markymark6,523 posts since 13 Dec 2004
Meridian (North) South Today
My partner’s car radio somehow manages to flick seamlessly from DAB to FM to prevent signal drop-out on the BBC national stations (and possibly others).

Yeah, it's very handy. I guess it's based on the RDS IDs being the same between DAB and FM? I think I've heard it both seamlessly and not (i.e repeats on the way back to DAB) so I wonder if some stations are deliberately delaying FM. Would they really be likely to do that though??

It's very difficult to do that as all the receivers will take different amounts of time to decide the signal. You can have two DAB (or even DVB) receivers in the same room tuned to the same thing and they won't be in sync..

I am pretty sure the BBC stations aren't delayed, Big Ben, when it's working, can be heard on the radio before it can be heard as sound if you're in Westminster Bridge


Classic FM I think delay their FM output to broadly match DAB (only broadly, because as you point out the exact delay is receiver dependant)
Markymark6,523 posts since 13 Dec 2004
Meridian (North) South Today

I'd like to see HD radio used alongside DAB or more likely DAB+, in years to come, it can be used on AM too. But the likelihood of that happening is absolute zero.


It's sub-carriers added to the primary FM or AM analogue carrier. You can't do that with DAB because the COFDM signal is 1700 separte carriers, and you can't have sidebands, different kettle of fish completely.

http://ecee.colorado.edu/~liue/teaching/comm_standards/2011F_HD_Radio/index.html

It works alongside the analogue signal rather like NICAM did on our analogue TV system, and as
observed if the signal reduces to an unacceptable level, the digital output is replaced by the analogue, (which is what happened to NICAM too on weak signals)


That wasn't quite what I meant, apologies for not making that clear.

I would like to see HD Radio used on the AM & FM wavebands, and DAB+ used on the current DAB band. You could use both technologies simultaneously, as they broadcast in different wavebands. FM is 87.5 to 108, whilst DAB is 176 to 212, so there's space to use both technologies. As I said, it has absolutely zero chance of happening, but I would like to see it.


Ah, I understood now Thumbs up
Whataday9,787 posts since 13 Sep 2001
HTV Wales Wales Today
It seems some of the local talent are being found work elsewhere within Global.

From Capital South Wales Breakfast, Matt Lissack is staying on behind the scenes at Cardiff in a management role. He has apparently been in the role since last year in anticipation of coming off air.

Matt's co-host Polly James is promoted to Friday & Saturday nights on Radio X.

*

Capital London's Breakfast Show is confirmed for the network (except Capital Cymru in North Wales which retains its breakfast show)
Last edited by Whataday on 11 March 2019 5:25pm
1
rob gave kudos
Ash10136 posts since 25 Mar 2018
Meridian (South) South Today
Polly used to be on Absolute Radio, so I suppose she’s bounced back to the level she was on before getting Capital Breakfast in South Wales.

I do wonder how long these shows will last though, as once legislation has passed through parliament, Ofcom can get rid of all local hour commitments. I would expect Capital to take advantage of that at least.
London Lite10,203 posts since 4 Jan 2003
London London
Capital Cymru in Anglesey and Gwynedd is still the odd one out, where they still have 10 hours of local Welsh output, including some way off target old Welsh songs that are not on-brand. This despite the BBC providing Radio Cymru.
dvboy9,709 posts since 11 Jan 2003
Central (West) Midlands Today
Looks like the East Midlands loses out the most, its drivetime show is merged with Birmingham's team who are moving from breakfast. Birmingham's current drivetime present Sacha Brookes also does an opt out (pre-rec) on Friday mornings 2-4am, I presume that show's also gone. The national breakfast show starts 8 April.