[Quietcars] Quiet vehicle warning sounds

[Mark J. Cadigan]

Mr. Wilson,



I have several reports that I have downloaded from the NHTSA website and I 
haven't finished reading all of them yet, however I don't think I have the 
third report you mentioned. Would you happen to have the URL for the third 
report? Also, do you know ware I can find any technical information about 
the construction and implementation of these synthetic sound sources?



Thanks,

Mark


----- Original Message ----- 
From: "Robert Wilson" <bwilson4web at hotmail.com>
To: <quietcars at nfbnet.org>
Sent: Sunday, November 20, 2011 4:24 PM
Subject: Re: [Quietcars] Quiet vehicle warning sounds


> This year the NHTSA has issued at least three, downloadable reports. I 
> don't have the URLs handy but they consists of:
>
> 1) April - survey of field study including blind subjects at an NHTSA 
> leased, rurual site. This includes credible metrics on sound levels and 
> characteristics.
>
> 2) August(?) - announcement of a call for environmental impact study 
> comments which can be found in www.regulations.gov
>
> 3) September/October - preliminary NHTSA report indicating it should sound 
> 'sound like a car engine.'
>
> Between Google and the NHTSA web site search function, you should have no 
> problem finding these sources. One thing the NHTSA report speculated about 
> was it is likely the implementations wiil use a microprocessor and speaker 
> setup to replicate an 'automotive-like' noise.
>
> The final NHTSA requlations have yet to be issued so it is likely that the 
> early manufactures will implement software configurable, noise maker 
> systems and wait for the final regulations to be issued. Technical issues 
> include the specific noise profile as well as the sound intensity map 
> around the car.
>
> My understanding is the Prius wagon (called the Prius V) has an 
> implementation. However, it and other implementations such as the Leaf, 
> Volt, and Fisker may change to comply with the final regulations.
>
> Bob Wilson
>
>> From: kramc11 at gmail.com
>> To: quietcars at nfbnet.org
>> Date: Sun, 20 Nov 2011 14:23:53 -0500
>> Subject: [Quietcars] Quiet vehicle warning sounds
>>
>> Hello fellow Federationists,
>>
>>
>>
>> I am working on researching quiet cars and their affect on blind 
>> pedestrians for a research paper for my Engineering Design course. I am 
>> looking for technical information on the synthetic sound sources 
>> manufacturers have developed for quiet vehicles. I was hoping you could 
>> direct me to some technical specifications about synthetic sound sources 
>> for silent or nearly silent vehicles.
>>
>>
>>
>> Thanks for your help,
>>
>> Mark J Cadigan
>>
>> Electrical Engineering Department
>>
>> Suffolk University
>>
>> mjcadigan at suffolk.edu
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