Noise Cancellation in Old BiPlane

[Joe G \(Home\)]

Hi All,

I'm helping research for a system that can cancel out cockpit noise in a
professional aircraft headset (David Clarke). Hence noise cancelling
microphone are already in use.

The Biplane cockpit is so noisy that system is needed.


Do you know / recommend / Suggest a system that might be suitable.

Thanks in advance.

Joe

 

[Spehro Pefhany]

Hi All,

I'm helping research for a system that can cancel out cockpit noise in a
professional aircraft headset (David Clarke). Hence noise cancelling
microphone are already in use.

The Biplane cockpit is so noisy that system is needed.


Do you know / recommend / Suggest a system that might be suitable.

Thanks in advance.

Joe

What's wrong with buying a Bose aviation headset? About $1K US.

Eg.
http://www.bose.com/controller?url=...viation_headsets/aviation_headset_x/index.jsp



Best regards,
Spehro Pefhany

 

[Joe G \(Home\)]

What's wrong with buying a Bose aviation headset? About $1K US.

Eg.
http://www.bose.com/controller?url=...viation_headsets/aviation_headset_x/index.jsp



Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
[email protected] Info for manufacturers:
http://www.trexon.com
Embedded software/hardware/analog Info for designers:
http://www.speff.com

Not bad -- but this cancels the noise in to the headset speaker.

I am also looking for cancelation of the noise getting in to the headset
microphone.

Regards
joe

 

[Geo]

I am also looking for cancelation of the noise getting in to the headset
microphone.

That is how the noise cancelling microphone works - it is open on both sides of
the diaphragm so that ambient noise (almost) cancels.

 

[Rich Grise]

[ top-post repaired ]

You are asking for a solution to the holy grail of aircraft headset
design. We've been after something to cancel microphone wind and engine
noise for the last 50 years that I've been in the business. The closest
we have come is a WWII design called a "throat mike". Look into it.

When I was in the USAF (1968-1976) they had headsets that were like
standard ear defenders, but with another piece that went over your mouth
and nose. It had the same kind of noise insulation (basically, a hard
plastic exterior and a bunch of soft foam inside) as the earthings, but
I think you still kind of had to shout into it, and it was uncomfortable
as hell.

But they _DID_ get the job done. ;-)

Cheers!
Rich

 

[Eeyore]

I am also looking for cancelation of the noise getting in to the headset
microphone.

Physically impossible.

Suggest you get a spam can instead.

Graham

 

[Joerg]

You are asking for a solution to the holy grail of aircraft headset design.
We've been after something to cancel microphone wind and engine noise for
the last 50 years that I've been in the business. The closest we have come
is a WWII design called a "throat mike". Look into it.

Isn't it considered a sin in aviation to muffle that sweet sound of the
big old radial engine up front? I enjoyed every second of it, including
the oil splatters on the shirt. The owner had to then fly it back to
Mariposa and I asked him whether the noise would go on his nerves during
long flights. "Are you kidding? This is like music!"

 

[krw]

Isn't it considered a sin in aviation to muffle that sweet sound of the
big old radial engine up front? I enjoyed every second of it, including
the oil splatters on the shirt. The owner had to then fly it back to
Mariposa and I asked him whether the noise would go on his nerves during
long flights. "Are you kidding? This is like music!"

Right. It gets on his nerves when it stops.

 

[Joe G \(Home\)]

Would such a system be useable to reduce PC supply fan noise?

Analog Devices has an app note on how to use a DSP to cancel fan noise.

JG

 

[Joe G \(Home\)]

You are asking for a solution to the holy grail of aircraft headset
design. We've been after something to cancel microphone wind and engine
noise for the last 50 years that I've been in the business. The closest
we have come is a WWII design called a "throat mike". Look into it.

Jim

I loke the Throat mike idea.... what did it sould like? normal voice or much
different.

Regards
Joe

 

[Joerg]

The problem isn't to muffle the engine noise to the pilot, but to the
passengers if (s)he has an intercom OR on the aircraft radio which is nearly
unintelligible with an open-cockpit aircraft.

In the Stearman we did not have any problems with either and the gear
was not the fancy Clarke stuff, looked like plain old military issue.

 

[Mikey]

Try this place

Try looking up Envisys dot com
I'm New to this board, it will not allow URLs

 

[krw]

I loke the Throat mike idea.... what did it sould like? normal voice or much
different.

A little garbled but I don't think you could tell the difference. ;-)

 

[Joe G \(Home\)]

I'm helping research for a system that can cancel out cockpit noise in a

professional aircraft headset (David Clarke). Hence noise cancelling
microphone are already in use.

The Biplane cockpit is so noisy that system is needed.

I found out more... the BiPlane Pilot already has system using a mobile
phone. with an audio patch circuit to a David Clark headset.

I will get the pilot to ring my land line (POTS PSTN) and record the
iPlane - while he is talking to me and without any talking..

I'll record it using Opensource (free) Audacy software on a PC.... then do
a audio spectrum plot to see if we can notch out the noise.


I aleady have a telephone interface circuit that plugs in tp the microphone
of the PC...


Joe

 

[Joerg]

I found out more... the BiPlane Pilot already has system using a mobile
phone. with an audio patch circuit to a David Clark headset.

I will get the pilot to ring my land line (POTS PSTN) and record the
iPlane - while he is talking to me and without any talking..

iPod, iPhone, iPlane ? Finally Apple must have come out with something
really useful. Cool! I wan't one