Thread Subject: Re: Volume control - TIA recommendation for 1194.23(g)
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From: Gregg Vanderheiden
Date: Sun, Jun 24 2007 12:35 AM
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Posted to the WIKI.
Something to think about. Should we reference a specific FCC memo in a
standard? I can see why - but what if they issue a newer one. Maybe it
" A manual override switch may be provided to prevent the automatic reset
subject to the conditions specified by the FCC. (Note: most recent
Memorandum Opinion and Order on this at time of writing is DA 01-578.)"
Also - do we want to say anything about distortion? There was discussion
about this in the Closed group and research from the Hearing Enhancement
project that was funded by the Access Board was cited. Said that 12 db of
symmetrical clipping was ok but not more. Not sure what that is in THD.
Gregg C Vanderheiden Ph.D.
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Subject: [teitac-telecom] Volume control - TIA recommendation for 1194.23(g)
Apologies to the list-serv. The previous suggestion for (f) is for the
voice signal measurement. This one is for volume control. As explained to
me by TIA subject matter gurus, the FCC has narrowly prescribed what
manufacturers can do in this situation - either have an auto reset per the
regulation or meet the conditions in the referenced waiver. Thus the
language recommended by TIA is:
1194,23(g) If the telecommunications product allows a user to adjust the
receive volume, a function shall be provided to automatically reset the
volume to a safe level after every use if the volume is capable of greater
than 18 dB of gain A manual override switch may be provided to prevent the
automatic reset subject to the conditions specified in FCC Memorandum
Opinion and Order DA 01-578.
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