D
‐
0125127
‐
C
23
White
‐
weighted
noise
can
be
used
mostly
for
testing
of
equipment.
It
is
not
recommended
to
use
it
for
hearing
aid
fitting,
unless
specified
by
the
manufacturer.
Crest
Factor:
BBN
=
1.73
(4.8dB),
PRN
=
7.86
(17.9dB)
Pink:
The
noise
is
filtered
so
its
energy
per
frequency
(power
spectral
density)
is
inversely
proportional
to
the
frequency.
Each
octave
carries
the
same
amount
of
energy.
Comparing
to
White
Noise,
the
Pink
Noise
energy
drops
approximately
3dB
per
octave.
Pink
‐
weighted
noise
can
be
used
mostly
for
testing
of
equipment.
It
is
not
recommended
to
use
it
for
hearing
aid
fitting,
unless
specified
by
the
manufacturer.
Crest
Factor:
BBN
=
3.67
(11.3dB),
PRN
=
6.55
(16.3dB)
Speech
–
Byrne:
The
noise
is
approximately
weighted
to
International
Long
Terms
Average
Speech
Spectrum
(ILTASS)
as
described
in
Byrne
et.
al.,
1994.
The
noise
with
this
weighting
is
preferred
for
hearing
aid
fitting
because
its
spectrum
is
the
best
approximation
of
the
spectrum
of
real
human
speech.
Crest
Factor:
BBN
=
4.22
(12.5dB),
PRN
=
3.47
(10.8dB)
Speech
–
ANSI:
The
noise
is
approximately
weighted
to
ANSI
S3.42
Speech
Noise.
The
noise
with
this
weighting
can
be
used
for
fitting
hearing
aids.
The
slope
of
ANSI
‐
weighted
noise
is
not
as
steep
as
Byrne
‐
weighted,
so
there
is
more
power
in
higher
octaves.
This
will
result
in
less
gain
required
by
the
hearing
aid
to
reach
targets,
but
may
result
in
under
‐
fitting
at
high
frequencies.
Crest
Factor:
BBN
=
4.46
(13.0dB),
PRN
=
5.17
(14.3dB)
To
activate
specific
REM
tests,
click
the
buttons
as
follows:
Opens
the
audiometry
data
entry
screen.
Use
this
if
audiometry
has
not
been
previously
measured
and
entered
into
Noah.
Real
Ear
Unaided
Response
‐
Measures
the
additive
effect
of
the
ear
canal’s
resonance
to
a
stimulus.
Reported
as
dB
SPL
of
output.
Real
Ear
Unaided
Gain
‐
Measures
the
additive
effect
of
the
ear
canal’s
resonance
to
a
stimulus.
Reported
as
dB
SPL
of
gain.
If
a
real
ear
unaided
response
(REUR)
curve
has
been
measured,
the
corresponding
real
ear
unaided
gain
curve
is
automatically
plotted
to
the
REUG
screen.
The
difference
between
the
REUG
and
the
REAG
is
called
the
Real
Ear
Insertion
Gain
(REIG).
This
Insertion
Gain
information
is
used
to
compare
to
the
target
gain
curve
selected
for
the
client.
The
Real
Ear
Aided
Response
(REAR)
is
the
sound
pressure
level
in
the
ear
canal
measured
with
the
probe
microphone
close
to
the
eardrum
and
the
operating
hearing
instrument
inserted
in
the
ear
and
turned
on.
ANSI
defines
REAR
as
the
SPL,
as
a
function
of
frequency,
at
a
specified
measurement
point
in
the
ear
canal
for
a
specified
sound
field,
with
the
hearing
aid
in
place
and
turned
on.
Summary of Contents for Avant REM+
Page 1: ...D 0125127 C 1...
