Subject:
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Re: Nic_1
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 10 Feb 2006 20:35:40 GMT
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Viewed:
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3031 times
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In lugnet.robotics, Matthew Ruschmann wrote:
> In lugnet.robotics, Claude Baumann wrote:
> > If you want to see Nic_1, a sound following robot, go to
> > http://www.convict.lu/Jeunes/ultimate_stuff/Nic_1.htm
> >
> > Nic_1 runs a program on the RCX that first samples two RCX sensor input ports at
> > 36000 Hz (there is no mistake here !) to receive 300 samples from both
> > microphone channels. Then the program operates a fast and simplified
> > cross-correlation, yielding the phase-lag between both audio-signals. This value
> > is used to indicate the direction towards which Nic_1 is supposed to turn. The
> > program prunes erroneous values that might appear due to room reverberation. The
> > program was written with Ultimate ROBOLAB.
> >
> > The video shows Nic_1 whilst tracking radio-music. It also could be a music
> > instrument or a human voice.
> >
> > Enjoy.
>
> Hey that's pretty amazing for the standard RCX firmware. I guess calculation
> time doesn't really matter though.
Calculation time is very short -regarded the H8 limits- On the video and the
program diagram you can conclude that the robot turns about every 2 seconds.
Deduce the 0.8 sec pause and you have something around 1.2 seconds for a
cross-correlation of 300 samples.
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Message is in Reply To:
 | | Re: Nic_1
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| (...) Hey that's pretty amazing for the standard RCX firmware. I guess calculation time doesn't really matter though. I'm a graduate EE taking estimation theory this semester so I'll keep this close to my heart. :-p I can't wait to try 2 mics on the (...) (20 years ago, 10-Feb-06, to lugnet.robotics)
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