You can bet that when I do, I am not looking at the damned airline rags.
I spent $25 on magazines on my last flight to DC. Worth every penny. Watched a movie off my laptop hard drive too.
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- posted
12 years ago
noise canceling headphones
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- posted
12 years ago
Most commonly, batteries.
Trevor.
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12 years ago
A battery. Same thing that lights up the little green LED that makes the cabin crew stop and tell me to shut off my headphones when we take off.
-- Paul Hovnanian mailto:Paul@Hovnanian.com ------------------------------------------------------------------ I think you left the stove on.
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- posted
12 years ago
Hi,
Turn off the drive signal and listen periodically, like a sensorless BLDC motor maybe?
cheers, Jamie
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12 years ago
And could you explain to me how all the battery power gets to headphone sets that do not contain batteries, nor obtain such power from the base device? They shrilly claim to be noise canceling headphones as well.
?-)
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12 years ago
the
Think that through really carefully. What would be the user response to that?
?-)
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12 years ago
Hi,
Ok maybe a better idea is to do a continuous FFT of the actual headphone voltages and then compare this to the "desired" FFT from the digital audio signal (ie MP3) and then generate a correction signal to adjust the output voltage.
cheers, Jamie
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- posted
12 years ago
an amplifier with negative impedance gets you part way there.
-- ?? 100% natural