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2. OPERATION
Tape Recorder
Reference Recording
Tape
Recorder
Level Recorder
Frequency Response Plotting
.,~~-·~·
Fig. 2.15. Set-ups for tape-recorder investigations. In the case of two channel
recorders, the channel selector of the 4409 is used and the channel on which
the reference recording is made is also connected to the synchro-starter.
In addition it must be ensured that the 1 kHz start signal is free from "flaws"
or wow which might be able to actuate the 4409 too early. Using high-fidelity
tape and a short start signal eliminates this risk. An example of the frequency
response of a motion picture sound reproducing system checked by means of
the B
&
K equipment is shown in Fig. 2.16.
~COCOOOODDD:DDODDDDDDDDDDPDDDDDbDDDDDODDDODDDDDDDDC
lrl:!,!!l•r
+ •
25
.
loo.l6r,.·
,
..... ,.,
.
...a~~
11 11
.
-
- --··
::·~
:::DS
~··
.
t i l
.
. ......... ,..!Wt
.
..,~-
···
QP 1123
1l
•
I
~
-
1000
C/S
-
e1t
IICIDA
I
C
U..
0
11000
, ... , ..
Fig.
2.16.
Example
oJ
experimental result obtained by using the set-ups of
Fig. 2.15 for testing a motion picture sound reproducing system.
32
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