Alt-BEAM Archive
Message #00039
To: "'RoboDR@aol.com'" RoboDR@aol.com, beam@corp.sgi.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Sat, 30 Jan 1999 11:57:47 -0800
Subject: [alt-beam] Re: a question and a comment
Some additional signal processing would be required but in principle one
could use 3 or 4 microphones and discriminate direction information from
delay in "sound" arival time which can then be used to steer away or towards
the sound source
Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493
fax: (604)590-3411
> -----Original Message-----
> From: RoboDR@aol.com [SMTP:RoboDR@aol.com]
> Sent: Friday, January 29, 1999 10:31 PM
> To: beam@corp.sgi.com
> Subject: Re: a question and a comment
>
> << Yep. what you need is a high-pass filter. You connect a capacitor to
> the
> output from your sensor, and connect the other end to the input of an
> inverter. Then get a resistor, and tie the input of the inverter to
> ground.
> What you essentially have is something that looks exactly like a
> microcore
> neuron, but instead of getting its input from another neuron, it gets its
> input from a sensor. Changing the time constant of the
> Resistor/capacitor
> will change the lowest frequency that the neuron is capable of receiving.
> There is no upper frequency limit in this configuration. >>
>
> So this circuit will ignor a rise in Voltage from, say, 0 to 10V
> that
> occurs over several seconds, but if the voltage rises from, say, 1 to 4V
> in a
> split second it will trigger? And it could there for be used to give a
> robot a
> startled reaction. For example, if we hear a gradual rise in noise we
> don't
> react even if the final noise level is very high. But if we hear an abrupt
> rise in noise level, even if the highest level of noise is relatively
> quiet,
> we have a tendency to be startled. Instead of having a fixed trigger
> voltage,
> it looks foor the abbrupt rise in voltage.
> The startle reaction could be used as a defense mechanism. If the
> robot
> is startled, it might trigger a photophobic reaction which would lead it
> to a
> hiding place out of harms way.
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