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1. DESCRIP
TIO
N
1.
Description
Purpose of the
Equipment.
The Response Tes
t Unit
Type 4409 is
intend ed f or
use
with
the
B
&
K
auto-
ma
ti
c
fr
equency response plo tting
equipment when in
ves
ti
ga
tin
g the
fr
equency
respo nse
of
sound
r
eproducing
equipment.
F ig.
1.1
shows a
n
exa mple
in whi ch th
e 4409
and
a tes
t
reco rd
are
involved in
the
tes ting
of
a
stereophoni
c record player.
Level
recorder
Fig. 1.1. Meas
uring set-up f or autom
atic
plottin
g
of th
e
fr
eq
uen
cy
respon
se
of
a
st ereopilOni
c reco
rd player.
Th
e 4409
fulfil
s three
di
ffere
nt fun
ctions:
(a)
ch annel selecti
on
in
the case
of stereophoni
c
equipment either
man ually,
when only one
ch ann el
is inves
ti
ga
ted,
or
autom
a tically at a recur ing
fre-
q uency
of
1.2
ci
s
for
a utoma tic cross-
talk or comp
a
r
ison
m
eas urements.
(b) eqnaliza tion,
b
y diffe
rent
RC
filters,
of
the
recordi
ng cha
racteristi
c
of
the
tes
t record.
(c)
synchroniz
a
tion of
the
paper-drive
of
the
Level Recor der
Type
2305
with
the reference recordings
(record or
tape)
under reproduction
.
It
is thus poss ible to a utoma
ti
cally
plot th
e
frequ
ency
r
esponse of
th
e
sound
reproducing
eq
uipment.
A typ
ical experimental r
es
ult
is shown
in
F ig. 1.2.
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