Can be done, has been done. We've used analog cancellation for a century
or so in telephones, after all. Op-Amps made it a lot easier to get 20
dB of it. And still no RF.
You may have been thinking of DSP noise subtraction, which does require
A/D, DSP and D/A circuitry.
Cortland
KA5S
On 8/29/2012 1431, [email protected] wrote:
From that article in TMWorld:
"...EMC engineer from Bose Corporation, who verified the design of
their headphones was completely analog with no emissions whatsoever"
I have difficulty believing noise-cancellation can be done "completely
analog".
How about the suggestion that all toys including Iphones, Ipads,
smartphones and laptops be kept turned-off during the entire flight.
Read a book, newspaper or in-flight magazine and relax; take some time
to "unplug".
_______________________________________________________________________________
*
Ralph McDiarmid* | *Schneider Electric **| Solar Business* |
*CANADA* | *Regulatory Compliance Engineering*
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