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In the VARI-MATRIX
position, 2-channel stereo input signals are converted into quadra-
phonic signals through the vari-matrix circuit; the input right and teft channel signals are fed
directly to the LF and RF channels, while the signals to the LR and RR channels are synthesized
from the 2-channel
input signals under the control of the DIMENSION
control. The
LR and
RR channel
signal components
are controlled
by the DIMENSION
control as shown
below.
DIMENSION Control Setting
Minimum {FCCW)
Center
Maximum (FCW)
When the DIMENSION
control is set to the minimum position the LR and RR channel
signals become
monophonic,
to the center are stereophonic, and to the maximum
are out of
phase, thus providing vanished sound image positioning.
In the SQ DECODER
position, signal sources encoded
by the CBS SO system are ideally
decoded into 4-channel signals. Required for this operation is incorporation of the SQ Adaptor,
Model SQA-1, into the Model 4270.
:
4.2
Balance Control
Signals from the buffer amplifiers are fed into the balance control circuit, in which the
signals are controlled by three balancers: FRONT
L-R, REAR
L-R, and FRONT-REAR.
By
setting the FRONT-REAR
balancer to the "FRONT" side and the FRONT L-R balancer to the
"LY" side,.for example, only the front left channel is drived.
5. DOLBY
UNIT
An input signal coming to J601 is amplified by H601, and its output signal is led to the filter
which cuts off the tape bias. The signal passed through the filter is further amplified and comes
to the mixing circuit of resistors R623 and R625 and to the phase inverting circuit of H607 and
H609. The output signal is fed out from J607.
In the recording mode of operation, the signal is fed out from J605 preceding the mixing
circuit and applied at J611. The signal is then discriminated in the frequency and level by the
dynamic filter consisting of H611, H613, H615 and H617, and is fed back to the mixing circuit.
in the playback mode of operation, a part of the output signal (at J607) is fed to J611 and
discriminated in the frequency and level by the dynamic filter consisting of H611, H613, H615
and H617 and fed back to the mixing circuit.
6. 400Hz TONE
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