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Graphene Speakers [message #73969] Wed, 26 September 2012 15:24 Go to next message
Chicken is currently offline  Chicken
Messages: 300
Registered: August 2011
Grand Master
I just read this article on graphene speakers, which use oscillations in heat energy that create air pressure changes and therefore sound. I'd be interested to hear how it sounds.
Re: Graphene Speakers [message #73980 is a reply to message #73969] Thu, 27 September 2012 08:44 Go to previous messageGo to next message
audioaudio90 is currently offline  audioaudio90
Messages: 623
Registered: October 2010
Illuminati (1st Degree)
I would like to hear it too. Being able to put a speaker on such a flexible substrate would be useful, but it's got to be able to faithfully reproduce the frequencies, and since he's only run milliamps across it, I want to know how well it works at higher currents.
Re: Graphene Speakers [message #74092 is a reply to message #73969] Tue, 09 October 2012 11:45 Go to previous messageGo to next message
Nymeria is currently offline  Nymeria
Messages: 508
Registered: April 2011
Illuminati (1st Degree)
That is interesting. I can see how it works, since air molecules move further apart when heated and closer together when cooled, so you could get the pressure changes needed for sound. I wonder why no one has thought to try this method before.
Re: Graphene Speakers [message #74094 is a reply to message #73969] Tue, 09 October 2012 13:36 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18670
Registered: January 2001
Illuminati (33rd Degree)

This is completely unrelated, but is another interesting alternate technology. Two ultrasonic carriers signals are used, with one shifted so the beat frequency of the interference is modulated to form an audio signal in the 20-20kHz range.
Re: Graphene Speakers [message #74114 is a reply to message #74094] Fri, 12 October 2012 10:52 Go to previous message
audioaudio90 is currently offline  audioaudio90
Messages: 623
Registered: October 2010
Illuminati (1st Degree)
Wayne, I understand how the beat frequency is created, but I'm not sure what beam steering is. Does it mean they change one or both of the ultrasonic frequencies to vary the beat frequency?
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