Thread Subject: Re: Volume Gain (2.2-E)
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From: Diane Golden
Date: Wed, Sep 12 2007 9:00 AM
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The current 508 standard requires a minimum of 20 dB gain. Gregg suggested
revising to "volume should go up to 18db". That wording would not require a
minimum of 18 dB gain but rather suggests a max gain of 18dB. Was that the
intent? If so, would the minimum gain requirement then go to the 12 dB of
the FCC? That would harmonize with the FCC.
However, if the intent is to require a minimum of 18 dB gain in 508, I'm
guessing the problem from the vendor standpoint is that building to a
minimum of 18 puts you right on the edge of needing the auto default and
just normal variance would trigger that extra requirement. I don't know the
rationale for the 12 level used by the FCC versus something like 15 that
would still provide some variance space before the auto default was
required. I assume the 18 was based on something that indicated that was a
level of concern for someone to inherent a volume with that amount of gain
that could possibly cause hearing damage.
From: Gregg Vanderheiden [mailto: = EMAIL ADDRESS REMOVED = ]
Sent: Tuesday, September 11, 2007 8:21 PM
To: 'TEITAC Committee'; = EMAIL ADDRESS REMOVED =
Cc: 'Steve Whitesell'
Subject: RE: [teitac-committee] Volume Gain (2.2-E)
I'm not sure I follow
If FCC says "no more than 18 db"
And TEITAC were to switch to " volume should go up to 18db"
It sounds like they would harmonize - not conflict.
Also - our 20 db volume also does not conflict with FCC's since their rule
is that it can't go beyond 18db without a setback- which TEITAC has.
However, if TEITAC were to reduce the required max volume to 18db it would
mean that every phone would not be required to have a setback. I would
suggest we think about this. Reducing 20 to 18 db is only a 13% reduction
in max volume.
Gregg C Vanderheiden Ph.D.