Thread Subject: Re: 1194.25 (f) Voice Output in Public Area
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From: Gregg Vanderheiden
Date: Wed, Jun 06 2007 4:20 PM
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65 db is normal conversation level in a quiet room. That won't be very
useful in public place.
An office interior is about 60 db and I would guess a mall is louder than
that. so if we go 20 db up from an office we are at 80 db.
If a mall is louder than an office 20 db would be higher.
See:
http://trace.wisc.edu/docs/2004-About-dB
here is an excerpt.
Quiet rural area or small theater 40 1/4th as loud
Office interior or ordinary conversation 60 Ordinary
Conversation
Gregg
-- ------------------------------
Gregg C Vanderheiden Ph.D.
> -----Original Message-----
> From: = EMAIL ADDRESS REMOVED =
> [mailto: = EMAIL ADDRESS REMOVED = ] On Behalf Of
> Debbie Cook
> Sent: Wednesday, June 06, 2007 4:28 PM
> To: = EMAIL ADDRESS REMOVED =
> Subject: [teitac-closed] 1194.25 (f) Voice Output in Public Area
>
> Current Language:
> When products deliver voice output in a public area,
> incremental volume control shall be provided with output
> amplification up to a level of at least 65 dB. Where the
> ambient noise level of the environment is above 45 dB, a
> volume gain of at least 20 dB above the ambient level shall
> be user selectable.
> A function shall be provided to automatically reset the
> volume to the default level after every use.
>
> Discussion:
> The only issue raised is that it is generally difficult to
> determine ambient noise level in a public place especially
> where that noise level may change.
> Can we just prescribe the 65DB and that it is otherwise user
> selectable without trying to deal with variations in ambient noise?
>
> Debbie Cook
> WA Assistive Technology Program
> Box 357920
> Seattle, WA 98195-7920
> Phone: 206-685-4181
>
>
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