Cross-Field Head - Akai X-200D Operator's Manual

( i
record ing head
(4 )
I
2 _ _ _ _ _ __ _ _
4 -
3
2---------
3 _ _ _ _ _ _ _ _ _
, . ..,
......
4
Dlaar a m 1. Ordinary recording syst em .
Di agram 2 . Cross-f le ld recording syst em
Il::-
0
CROSS !"Ir.LO HE AD
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.
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BIAS
4-TRACK MONAURAL RECORDING/ PLAYBACK
Monaural recording/playback track scQucncc should be
l
·4 ·3·2.
(A) Set the TRACK SELECTOR to "'1 •4"' . The f ir st monaura l recording/ play•
back occurs on track I. and the second on track 4 af ter the ree ls have
been inver ted.
(BJ Invert t11 e reels.
(C) Set the TRACK SELECTOR to "'3 ·2'".
The third mo naura l recording/playback occurs on track 3. and the four th
on
tr
ck 2 af ter the roels have been inverted .
The X-2000 does not record in tho reverse direction. Usi ng rev rse play-
back, it Is not necessary to turn the t ape ree ls over . When the X-2000
begins rever se pl ayback. t he re1:ord/ playback head Is automatically shi rted
to t he remainin g tracks .
5. CROSS-FIELD HEAD
AKAl"s exclusive cross-fie ld head ha s created a se nsation In the tape recorder
world by offering a wide recording range which has never bee n duplicated.
Using t11ls cross-held head , Model X-2000 provides a surprising recording per•
formancc (30 26 .000Hz ± 3db at a tape speed of 7 •1/2 1ps.)
Ylhy is cross-field record ing superior? How does it differ from conventional
recording methods ? ·
In the typica l recording sys tem, the signal current and the bias current are
combined and applied to tile recording head. (Diagram 1.)
It is well known that the bias current is to minimize distortion while maintain•
ing a proper sensitivity ratio.
However, the bias current providing such an advantage also has an undeslra •
blo effect. That is, the wide magnetic field of th e bias current affect s tho
recorded signal, resu lt l ng in the weakening or oven erasing of t he sig nal.
Th is is partic ularly noticeable at high freQuencies. In the cross field system.
the signal current is applied t o the recording head while the bias current is
applied to tho bias head.
These two heads are positi oned in ter-relatively, so th at the magnetic field of
the bias will not affect the signa l recorded on the tape, oven when maxim um
bias is applied. This permits recording with high fideli ty even at low speeds .