Throat mic with Sennheiser beltpacks

[ninjadingle]

Morning all,

 

Have an interesting need for a vet to be talking through animal dissections - in certain cases they will be wearing full PPE including forced air ventilation hoods. As such I'm looking for them to wear a throat mic to overcome the loud ambient noise the hood would create, I've used throat mics in noisy situations before and know how effective they can be.

 

However throat mics are only really used in radio comms - and we're being told that it's not possible to adapt a radio throat mic to be used with a Sennheiser beltpack. Anyone have any thoughts on this - or anyone actually done it? TIA.

[Lamplighter]

A throat mic being dynamic will require a dc blocking capacitor and the audio gain on the belt-pack turned right up. It should be doable. The quality won't be great but I suspect that is not really relevant.

Brian

[abbotsmike]

Would something like a sennheiser SL work? From experience they do have good ambient noise rejection, no idea if that would play out well inside a ventilated hood!

[tonytech]

I wired a motorcycle coms throat mic to a cheapish KAM radiomic belt pack.

I used it to get a "throaty roar beast" effect in "Beauty and the beast" panto.

It worked well and the dynamic range wasnt too bad.

I think it just wired straight in using a spare plug with the dc bias resistor/capacitor.

T

[Doug Siddons]

Just a thought but could you not hire the radio + throat mic and then take the audio from the receiver?

[Jivemaster]

As an alternative could you fit the forced air inlet hose with a long length of mic cable or two (internally) and have a throat mike AND a headworn mike and record both separately.

 

Though a dynamic mic may not interface with a radio mic pack directly, I'm certain that there will be a commercial or DIY option.

[alistermorton]

Or another alternative (following from the idea of a cable up the air pipe) - a differential mic as used in motorcycle comms, which has to solve the same problem; loud, moving air inside the crash helmet.

[Lamplighter]

If intelligibility is important a bone conduction microphone could be the answer, though they are not cheap. I've used them in pressurized suits with good results.

Brian

 

 

[ninjadingle]

The audio is being transmitted live, not recorded (from wireless receiver into Crestron NVX to be streamed to various classrooms live) - intelligibility is important, hence why I want to look at other options than a traditional lavalier. Bone induction sounds interesting, worth a look I feel. Can you recommend any starting points please Brian?

[Lamplighter]

Hi Sam

This is similar to the one that I used.

https://www.pmctelecom.co.uk/two-way-radios/two-way-radio-accessories/entel-cxr5-950-bone-conductive-skull-microphone-with-in-line-ptt-new?gclid=EAIaIQobChMI

 

I can't find the actual unit. It was available via Motorola and just shy of £1000 around 12 years ago. The marketing feature at the time was that it was in use by those protecting their great leader but also useful with BA sets.

I don't know if the PTT would be useful, I used an under arm squeeze pad. PM me if you want a chat.

Brian

 

 

[ninjadingle]

Interesting thought - I'll put it to the client and see what they think! Thanks.