1. V39N4 of the BAS Speaker has
been published..It features On Vacuum TubesThen
and Now by Brian Geyer and CEDIA show reports. There is a
writeup of the meeting with JansZen Electrostatics and David Janszen
by David Hadaway. David Weinberg writes on UltraHD andHDR video.
2. Our eardrums move in sync with
Researchers at Duke University have been using
microphones inserted into people's ears to study how their eardrums
change during saccades the movement that occurs when we shift
visual focus from one place to another.. They were used the microphones
to detect changes in ear canal pressure that were probably caused
by middle-ear muscles tugging on the eardrum.
These pressure changes indicate that when we
look left, for example, the drum of our left ear gets pulled further
into the ear and that of our right ear gets pushed out, before they
both swing back and forth a few times.
They may prepare our ears to ear sound from
a particular direction..
The changes to the eardrums began as early as
10 milliseconds before the eyes started to move.
One theory is that it helps the brain make sense
of what we see and here.
They could imagine a mechanism being incorporated
into hearing aids that picks up signals of eyes moving to a new
location and tries to amplify the sound at that location..
[I wonder if tensioning the eardrum raises its
resonant frequency and thus enhances the sensitivity to high frequency
pitches which are important in sensing directionality] New Scientist
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