Sony BVH-2000, Operation And Maintenance Manual

Page: 279 / 505

(5-3-5. AE-03 Board)
7. AU Crosstalk Canceller (PS-04 Model)
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Whereas in the 00/02 model the crosstalk between the AUDIO-3
and tracks is cancelled, in the PS-04 model the crosstalk
between the AUDIO-4 and CTL tracks is cancelled.
(1) PB Mode (PB CTL to PB AUD-4)
Part of the PB CTL signal from the AP board is supplied to
the AUDIO-4
playback amplifier on the AE board to
reduce the crosstalk.
(2) VIDEO ASSEMBLE Mode (REC CTL to PB AUD-4)
In the video assemble editing mode, both the video and
channels are open for recording and so part of the
REC CTL signal, produced by the CD board, is supplied to
the AUDIO-4
to reduce the crosstalk.
However, in the 04 model, the mechanical distance
between the AUDIO-4 and CTL tracks on the
RIP
head
differs from that in the 00/02 model and so the trequencv
components
of the crosstalk which is generated also differ.
(3) AUD-4 INSERT Mode (REC AUD-4 to PB CTL)
This canceller functions in the AUDIO-4 insert mode. In
order to lock the servo stably, the recording amplifier is
muted the of the rise and fall of the A4 CANCEL
signal supplied from the BE-02 board, and this prevents PB
CTL from being affected.
crosstauc Canceller
In the PS-04 model, crosstalk between AUDIO-3 and AUDIO-4
is cancelled
out.
(1) AUDIO-3 INSERT Mode (REC AUD-3 to PB AUD-4)
This canceller functions in the AUDIO-3 insert mode.
(2) AUDIO-4 INSERT mode (REC AUD-4 to PB AUD-3)
This canceller functions in the AUDIO-4 insert mode.
mode AUD-3 to
Part of the AUDIO-3 playback signal is supplied to the
AUDIO-4 playback amplifier to reduce the crosstalk.
(4) PB mode (PB AUD-4 to PB AUD-3)
Part of the AUDIO-4 playback signal is supplied to the
AUDIO-3 to reduce the crosstalk.
(5) REC mode (REC AUD-3 to REC AUD-4)
Part of the AUDIO-3 recording signal is supplied to the
AUDIO-4 recording amplifier to reduce the crosstalk.
(6) REC mode (REC AUD-4 to REC AUD-3)
Part of the AUDIO-4 is to the
AUDIO-3 recording amplifier to reduce the crosstalk.
AUDIO SIGNAL SYSTEM
9. Time Code
When the A-3 SEL switch Sl is set to TC, the time code signal
can be recorded or played back by the AUDIO-3 channel.
(1) Time Code Recording System
When the A-3 SEL switch Sl is set to TC, the time code signal
which executes recording can be selected in accordance with the
setting of the INT/EXTI/EXT2 switch S2.
INT: Time code signal from TC-14A Board
EXT1: Time code signal supplied to connector panel's
TIME CODE IN connector(BNC)
EXT2: Time code signal supplied to AUDIO-3 LINE
INPUT connector
The time code signal selected by IC15 is converted to the TTL
level by the hysteresis comparator
configured by IC17 and IC21.
The time code signal for recording, which has been converted
to the TTL level, passes through switcher IC18/19, is waveform-
shaped
by ICI4, it passes through the AUDIO-3 recording
amplifier and is recorded onto the AUDIO-3 track Furthermore,
part of the time code signal which has passed through switcher
IC18/19 is
by ICI6, it passes through the LA
board, and it is output from the rear panel TIME CODE OUT
and AUDIO-3 LINE OUT connectors.
(2) Time Code Playback System
When the A-3 SEL switch SI is set to TC and the is placed
in the playback mode, the time code signals recorded on the
AUDIO-3 track are played back.
5-3-6
BVH-2000(U/C)/PS/PM
BVH-2180(U/C)/PS/PM