[Quietcars] Quiet vehicle warning sounds

[michael townsend]

I will try and locate info on some of these and repost the links. Sorry for
the delay.
 


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Mike Townsend and Seeing Eye dog Brent
Dunellen, New Jersey  08812
emails:  mrtownsend at optonline.net
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-----Original Message-----
From: quietcars-bounces at nfbnet.org [mailto:quietcars-bounces at nfbnet.org] On
Behalf Of Mark J. Cadigan
Sent: Sunday, November 20, 2011 4:47 PM
To: Discussion of new quiet cars and pedestrian safety
Subject: Re: [Quietcars] Quiet vehicle warning sounds

Mr. Townsend,



Would you happen to have links to or acksess to technical information about
those systems, all I am able to find is wickipeadia articles, as well as
press releases. For this research project I need some more technical
information on how the system works,



For example,



Does the sound volume vary with background noise, or does it constantly
broadcast at all time at the same volume?



How loud is this sound, sound in decibels as a function of distance?



What types of sounds are being utilized, EG a recording of an actual engine,

or some sort of space ship sound that will be unrecognizable as a car.



Are the speakers omni directional, or can u hear the car equally well from 
all directions.



And, the holy grail of information would be schematics, or some sort of 
technical description or patent applications.



Thanks

Mark


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