Octave Impulse Precision Artificial
Filter
\.-el..t_._._----.-___.,.~tJo•u•n/.d
11
~•e••~el
MetC:a~Abt:le:::~~~
I
'P
-~-
1613
2209
AO
0027
4153
f7200~
Fig.6.30.
The
Artificial
Ear Type 4153
used
in conjunction with the 2209
and the Octave Filter Set Type 1613
The basic research work was done
at
the
National Physical Laboratory,
Teddington, England by Robinson, Whittle and Delaney and
the
4930
comes very near
to
the
ideal artificial mastoid. Type 4930 conforms
to
BS
4009:1966 and also
to
the
proposed IEC standard for Artificial
Mastoids:
Audiometer
Bone
Vibrator
under
test
0
o·
•
0
•
•
•
Fig.6.31. Set-up
for
simple calibration
of
bone vibrator
6.2.15. Connection Cable
AO
0007
This cable connects
the
output
of
the
meter
to
recording instruments.
JP
0018
AC
0916
JP
0006
q
-~~~
=::r::==C
1
UIDo
1.2m
Fig.6.32. Connection cable
AO
0007
88
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