Paul MacCready: Nature vs. humans, and what we can do about

http://www.ted.com In 1998, aircraft designer Paul MacCready looks at a planet on which humans have utterly dominated nature, and talks about what we all can do to preserve nature's balance. His contribution: solar planes, superefficient gliders and the electric car.

Category:

Science & Technology

Tags:

• Paul
• MacCready
• TED
• TEDtalks
• talks
• Demo
• Design
• Flight
• Green
• Solar
• Technology
• Transportation

[sampsonoff]

the audio is terrible, please re-upload :)

[hunyaga]

Can you repost this video with audio?

[fishybishbash]

Audio's out of phase

[1980aankrah]

weird stereo sound effect is kind of disorientating!

[RamadaArtist]

@twochaudio also, fuck you. He's not a doomsayer, he saying "these are all the horrible things we're leading to if no one does anything about it, and here's what I'm doing about." What are you doing about it? The people who've lived through most of the 20th century have a hell of a lot more perspective of the direction of human intent and ability than a few fucking youtube pundits.

[RamadaArtist]

oh 20th century, how funny you were, back when even people at tech conferences can't get the damn projector to work.

[LeatherCladVegan]

And what it means physically, is that when the left speaker cone is moving forwards, the right speaker cone is moving backwards, and vice versa. These movements correspond to increased pressure - when the cone moves forward, and decreased pressure - when the cone moves backwards. It sounds (and feels) strange because one ear is experiencing an increase of pressure while the other is experiencing a decrease of pressure.

Swap the cables on one speaker to fix the sound.

[LeatherCladVegan]

The left and right audio channels are out of phase by 180 degrees.

If you've ever wondered what people mean when they say that audio is 'out of phase', you are now hearing it. It sounds very strange and it puts what we call a 'hole in the middle', between the two speakers. If you are not hearing a problem with the audio, then your speakers may well be wired out of phase (i.e. black to red on one speaker). There is also a harmonic feedback issue, but most people probalbly don't even notice that.

[twochaudio]

Another Doomsayer

[essamkoko]

he just told you dont bleave every thing in the book :):) just leave the end of the book on this one...

[bennymcfarlane]

I can also hear the audio fine. I have powered speakers, and they're not up very loud... but it sounds like the left and right channels are out of phase...