[Quietcars] An interesting perspective from someone off list.

[michael townsend]

And this is the reason why these things have to be investigated by people
who are knowledgeable of such factors.  Thanks, Bob, for your interest, your
knowledge and your posts.

Mike T 

-----Original Message-----
From: quietcars-bounces at nfbnet.org [mailto:quietcars-bounces at nfbnet.org] On
Behalf Of Robert Wilson
Sent: Sunday, June 06, 2010 10:53 AM
To: quietcars at nfbnet.org
Subject: Re: [Quietcars] An interesting perspective from someone off list.


Hi,

One of the reasons I prefer a 'click' for an audio alert, a square wave, is
they are a broad spectrum source. They have harmonics that range across the
audio range and do not monopolize the audio band. Within a one second
interval, each click, a small fraction of the second, allows more audio
sources to work with out stepping on each other.

In contrast, as pointed at the June 23 hearing, a pure tone is easily lost
in the background noise and takes substantially more energy to detect.
Worse, they can step on each other making source detection more difficult.
Adding a second tone is less bad and one of the reasons pure tones are not
used in many alarm systems.

Bob Wilson

> Date: Tue, 1 Jun 2010 08:56:33 -0400
> From: mrtownsend at optonline.net
> To: quietcars at nfbnet.org
> Subject: [Quietcars] An interesting perspective from someone off list.
> 
> I was chatting with a friend of mine who works a Seeing Eye dog in
Kentucky.
> He has cochlear implants, and he's a "reborn" traveler, if you will, 
> because of this surgery that has enhanced his hearing.
> 
> After looking at some of the ideas I'd suggested and some of the ideas 
> that have been put forth on list, he shares the following as a person 
> who is both blind and has a hearing loss:
> 
> "I think that a hybrid should make a midrange noise. People who lose 
> partial hearing usually lose the high frequencies first, followed by 
> the lows. The midrange is generally intact. Perhaps, the noise of a 
> hybrid should be a bit like a regular internal combustion engine, but a
little higher and smoother.
> 
> I really like the idea of making turn signals audible outside of the 
> vehicle. That would be a clicking, making it easier to discern turning 
> traffic. For backing, I would have the pitch go from higher to lower. 
> For stopping, the sound would be softer, enough to know that the car 
> is on, but not enough to mute other traffic sounds."
> Has anyone else any ideas as a person who works with a hearing loss 
> and travels, and who is either a cane traveler or a dog guide user?  
> It would be interesting to hear what you have to say.
> 
> Thanks.
> 
> Mike T
> 
> 
>  
> 
> 
> "I am accustomed to hearing malicious falsehoods about myself...but I 
> think I have a right to resent, to object to, libelous statements 
> about my dog."
> -Franklin D. Roosevelt
> Mike Townsend and Seeing Eye dog Brent Dunellen, New Jersey  08812
> emails:  mrtownsend at optonline.net;
> michael.townsend54 at gmail.com
> Home Phone:  732  200-5643
> Cellular:  732  718-9480
>  
> 
> 
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