A doppler effect receiver could work in this regard. It could sense
approaching speed and distance based on signal strength. Obviously, there
would have to be a standard adopted by all auto manufacturers so the
information was uniformly transmitted to the blind person, but a doppler
effect receiver coupled to a vibrating transducer on a cane handle so they
got direction, velocity and rate of change info would work until several
cars were coming within range of the transmitter, the signals would then be
If each car had a unique digital code being transmitted. a small receiver could potentially diferentiate and give you the most important info first, such as the closest car or the one travelling fastest. The technology exists for all this, it remains to see if the will exists to make it happen.
At 09:19 AM 5/9/2006 -0500, you wrote: Dan, you're right. a Geiger counter orgy. OK, get out your microphones folks, or Dan will record this first with his very expensive microphone.
The sound of one or two cars would be easily enough dealt with in this way, but I think Dan is right. At some point, if the beeps all sound alike, we are in trouble. And, even if each manufacturer had different beeping sounds, that would still not be enough.
This is where the person with a dog may be better off than the cane traveler.
Ok, thinking off the top of my head as I write, what about having a sensor in one's cane that would give either sounds or directional vibrations based on where the cars with these transmitters are. Yes, if there is more than one car, it would be difficult, but if the transmitters only notified you of cars at a particular distance from you, you would only have to worry about the ones your cane was picking up at the moment. Not fool proof, by any means, and I wouldn't want to be in the middle of the street when the battery in my cane decided to die.
-----Original Message----- From: blindcooltech-bounce@xxxxxxxxxxxxx [mailto:blindcooltech-bounce@xxxxxxxxxxxxx] On Behalf Of The Scarlet Wombat Sent: Tuesday, May 09, 2006 9:09 AM To: blindcooltech@xxxxxxxxxxxxx Subject: [bct] Re: more on hybrid cars
I think it could work too, Neal, but there are technical considerations to overcome. If, for example, there were four cars, three from your right and one from your left, the amount of beeps could become so tangled that you
would not be sure what was happening, just that there were cars. We can
discriminate by ear when we hear car sounds, but if the beeps all sounded the same, it would sound like a geiger counter orgy.
The cheapest solution is for the cars to make sound, but that probably will not fly with the manufacturers nor the customers. Not that I really care about whether they like it or not, but such concerns will drive the issue and marketplace.