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Pointless Sound Fault

BBC1

NG
noggin Founding member

They do use speakers but I would have thought that the combination of it being a talk back mic and that it was mixed with programme audio avoided any howl round, it sounded a bit echoey though


I'm trying to think how the talk back system audio can end up polluting the main programme audio ?!

I can only think it became 'acoustically' coupled, perhaps a talkback unit speaker left on in an unoccupied voiceover booth, and the announcer's mic in there somehow routed to Tx ?


The Red Bee playout system for BBC One/Two/Four/CBBC/CBeebies is all IP now I believe. If the talkback audio is too - and it's combined somehow in a continuity announcer monitoring and mixing unit - I guess that might be a route?
NG
noggin Founding member
Si-Co posted:
Just before we heard the talkback, I think there *may* be a bit of a sound glitch as if a switch of some kind had been pressed? Later, during the junction when we hear the director say something like “I’ll turn it off”, I wonder what exactly she was turning off? Did turning this “thing” off also mute the announcer’s mic, hence the clean ident?


My guess was that the dip in audio level may have been when the continuity announcer's audio panel was switched into circuit (that lets them dip the programme sound, bring up their mic and VO the end of shows). The fact that the ident into the Six O'Clock News was mute suggests that the route in may have been somehow linked to the announcer audio system?
MA
Markymark Meridian (Thames Valley) South Today

They do use speakers but I would have thought that the combination of it being a talk back mic and that it was mixed with programme audio avoided any howl round, it sounded a bit echoey though


I'm trying to think how the talk back system audio can end up polluting the main programme audio ?!

I can only think it became 'acoustically' coupled, perhaps a talkback unit speaker left on in an unoccupied voiceover booth, and the announcer's mic in there somehow routed to Tx ?


The Red Bee playout system for BBC One/Two/Four/CBBC/CBeebies is all IP now I believe. If the talkback audio is too - and it's combined somehow in a continuity announcer monitoring and mixing unit - I guess that might be a route?


Possible I suppose ! Or the first known case of NMOS working without any intervention Very Happy
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Avatar credit: © BBC, ITA, BREMA 1967
IS
Inspector Sands
a
My guess was that the dip in audio level may have been when the continuity announcer's audio panel was switched into circuit (that lets them dip the programme sound, bring up their mic and VO the end of shows). The fact that the ident into the Six O'Clock News was mute suggests that the route in may have been somehow linked to the announcer audio system?

It sounded to me like there was a ducker involved, resumably there's one for announcements. Hence the spurious audio, which was very noisy, made the programme audio lower
LE
Lewismpsmith Meridian (South East) South East Today
The CA being cued, absolutely loved that!
Hands. Face. Space.
SP
Steve in Pudsey Yorkshire Look North (Yorkshire)

They do use speakers but I would have thought that the combination of it being a talk back mic and that it was mixed with programme audio avoided any howl round, it sounded a bit echoey though


I'm trying to think how the talk back system audio can end up polluting the main programme audio ?!

I can only think it became 'acoustically' coupled, perhaps a talkback unit speaker left on in an unoccupied voiceover booth, and the announcer's mic in there somehow routed to Tx ?

NC1 and NC2 talkback gets fed to Nations and Regions, presumably multiplexed with the network distribution to keep it in sync. Could the error have been downstream of playout?
Write that down in your copybook now.
NG
noggin Founding member

They do use speakers but I would have thought that the combination of it being a talk back mic and that it was mixed with programme audio avoided any howl round, it sounded a bit echoey though


I'm trying to think how the talk back system audio can end up polluting the main programme audio ?!

I can only think it became 'acoustically' coupled, perhaps a talkback unit speaker left on in an unoccupied voiceover booth, and the announcer's mic in there somehow routed to Tx ?

NC1 and NC2 talkback gets fed to Nations and Regions, presumably multiplexed with the network distribution to keep it in sync. Could the error have been downstream of playout?


I don't believe that to be the case in terms of how the issue happened, nor do I believe the distribution of talkback is that tightly integrated into the network sound and vision feeds. (I don't think they are additional MPEG2 PIDs or embedded audio feeds in an uncompressed SDI-over-IP/Fibre stream, though Audio Description is)
NG
noggin Founding member

I'm trying to think how the talk back system audio can end up polluting the main programme audio ?!

I can only think it became 'acoustically' coupled, perhaps a talkback unit speaker left on in an unoccupied voiceover booth, and the announcer's mic in there somehow routed to Tx ?


The Red Bee playout system for BBC One/Two/Four/CBBC/CBeebies is all IP now I believe. If the talkback audio is too - and it's combined somehow in a continuity announcer monitoring and mixing unit - I guess that might be a route?


Possible I suppose ! Or the first known case of NMOS working without any intervention Very Happy


That said - if it was at the continuity announcer end that the fault condition happened (which it sounds like it might be) - I would imagine that they have a small bespoke sound desk which has inputs from their voice over mic, the output of the playout system's audio, and of their director's talkback - so that they can have a mix of these in their headphones... If that desk is IP (or just software controlled and conventional) a fault condition could presumably exist that bridges the talkback feed onto output...

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