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HiMD Clipping Test results

Subject: HiMD Clipping Test results
From: "Graham Evans" grayboodle
Date: Thu Jul 13, 2006 9:09 pm (PDT)
Here are the tests requested Rob.  imho they demonstrate that:

the effect IS clipping.
the effect is NOT related to PiP.

I would appreciate hearing any further conclusions which anyone can draw
from these results.

If I didn't have advice otherwise I would assume that the low-sens
setting introduced a pad.  Since this is not the case I am inclined to
think the clipping occurs at an A/D conversion stage, or perhaps in a
digital pre-amp stage.

Enough of my guesswork.  Here it is:
The files are around 480KB each.  There are 6 of them.  Find them at the
"Nature Recordist File Depot" here:
http://ad2004.hku.nl/index.php
nature -user
sound - pass

The Microphone used throughout the tests was a dual-mono wired Omni
pattern Audio Technica: AT943-SP (sold by Sound Professionals as
"PREMIUM MINIATURE LAPEL MICROPHONE").  I believe this mic is also
referred to as the ES943.

All recordings for these tests were made in HiSP mode with the WAV
conversion done by SS3.4 automatically on import.  That is my current
workflow so I just continued it.  Not ideal I admit but plenty of
fidelity to make useful results.

As noted on previous email I noticed the clipping effect when people get
a bit excited talking.  For these tests it was easier and less
embarrassing to reproduce the effect by singing.   I have not normalised
or manipulated the recordings just cropped for length.

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