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Print 35 comment(s) - last by Shining Arcani.. on Jun 16 at 5:49 AM

Look mom, no power brick!

Now this is a very interesting device. InflightPower.com has announced its InFlight Power USB Unit which allows you to charge small electronic devices via a standard headphone jack found in most airline seats. That means that you never have to worry about running out of juice when flying cross country or overseas with your iPod, PDA, cell phone or DVD player -- if the device can recharge via USB.

The 12 ounce device works by storing energy from the headphone jack and relaying that energy to the USB connector. The device uses a trickle charger which takes 3-5 minutes to fully charge. Once charged, it holds enough energy to power a connected device for about one minute and then the cycle starts over again. Over 700 devices are supported with different tips that attach to the USB port. From InflightPower’s website:

The Inflight Power cable uses an internal trickle charger that takes 3-5 min to fully charge, then outputs power to the attached device (phone, music player etc). It does this repeatedly, thus the cable charges the attached device every 3-5 minutes for 1 minute or less.

The audio volume must be cranked to the maximum to provide the best results. The InFlight Power USB Unit is available for $34.99 by itself, or $49.99 + $4.99 for each additional tip if you need a special connector for your electronic device.



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RE: hmmmm
By Eris23007 on 6/15/2006 7:59:17 PM , Rating: 2

Actually what you would want would be for the signal coming out of the headphone jack to be saturating the headphone amplifier.

Therefore, your best bet is probably to tune the headphone amp to the "pop music" channel and crank the volume *ALL* the way.

Why?

Most pop music audio engineers compress the hell out of the tracks. By compress I mean dynamic range compression, not file size compression. In many cases, eg with the LA-2A or 1176 Limiting Amplifiers (very popular vintage compressors used in high-end studios), his ends up acting like a brick-wall limiter, ensuring that the siganl coming out of the recording is remarkably consistent in dynamic range - that is, the signal is very consistently reaching the same peak levels and staying there for relatively long periods of time.

They also like to apply makeup gain to make the tracks "sound loud" or "sound huge", ensuring that those consistent levels are pegged very close to the maximum output of the recording medium, usually CD. In fact, in the case of CD (16-bit representations), it is particularly important to use this trick, as if you do not utilize as much of the dynamic range as possible (CDs have a dynamic range of 96 dB), you can end up with noise problems - and digital noise sounds like ass.

Anyway, so the point is, since you have those consistently high levels, if you max out the output of the airplane seat's headphone amp, you will provide the maximum possible amount of charge to this device.

If the airplanes had a "metal" channel, that could work even better, as distorted guitars tend to look more like square waves and therefore are even more likely to saturate the output of the airplane seat's headphone amp.

Once you turn up the volume as high as possible, this i


RE: hmmmm
By Eris23007 on 6/15/2006 7:59:57 PM , Rating: 2
Please neglect the last sentence-fragment... not sure what happened there...


RE: hmmmm
By Stoene on 6/16/2006 12:35:09 AM , Rating: 2
Nice, thanks for the info.


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