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Technical appendix
Equalizations (lEe. NAB)
TAP!:
SPECD
g,5cm/s
3,75ips
19cm/s
7.5
ips
38cm/s
lbips
For
correcting
the frequency response. inter-
nationally standardized
equalization
networks
are built into the record and
reproduce path
of
the
tape recorders.
The al1ack pOints
of
the
correction are re-
ferred to as tr"ositlon frequencies or transition
time constants and depend on the tap
e
speed.
They have bee
II
stenda
rdized by various orga-
nizations (IEC. NAB. AES. CCIR) as follows:
TRANSITION FREQUENCY. lOW AND HIGH
(TRANSITION TIME CONSTANTS)
IEC-1968
NAB-1965
50Hz; 1768Hz
50Hz; 1768Hz
(3180
j.ls, 90j.lSI
(3180
j.l s. 90f)s)
OHz, 2273Hz
(00; 70J,ls)
01-17,
4547 Hz
(QQ. 35(.15)
50
Hz,
3183 Hz
(3180j.ls; 50j.ls)
50
Hz:
3183
Hz
(3180IJs;
50,..5)
On the C270 tape recorder,
the
equalization
networks
are
plugged into
the
RECORD
EQUALIZER BOARD 1,77
/.540
00 and the
REPRODUCE EaUAUZER BOARD
1777.620.00, Due to this design It
IS
pOSSlblr
to convert or I"ccahbrate your recorder to dil-
'erent speeds or the Olh vr
equalization
stan-
dard.
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