Panasonic AG-7500 - Page 7

@
Use
of
newly
developed
audio
processing
IC
A
newly
developed
Hi-Fi
sound
IC
processes
the
audio
input
signals
at
the
optimum
level
without
deterioration.
As
a
result,
the
dynamic
range
has
been
increased
from
the
conventional
value
of
80
dB
to
90
dB,
making
for
impressive
dynamic
sound.
©
Deep
layer
audio
recording
which
does
not
interfere with the video signal
The
dedicated
audio
heads
record
a
wide
frequency
band
FM
signal
on
a
deep
layer
of
the
tape.
The
video
signal
is
recorded
over
the
audio
signal
using
a
completely
different
azimuth
angle
for
the
video
head.
As
a
result,
even
though
the
recording
position
is
the
same,
the
audio
and
video
signals
are
recorded
clearly
and
without
mutual
interference.
(Figs.
2
and
3)
©
Deep
layer
recording
as
seen
on
the
cross-section
of
the
tape
Dedicated
—— audio head
Dedicated video
recording head
Base film
Audio signal
(recorded on deep layer of tape)
Video signal
(recorded
on
surface
layer
of
tape)
©
Track
pattern
of
deep-layer
recording
(outline)
Normal audio track
CH2
ae — CH1
MMMM
VICHUASUUUUIGUGAUEONLUTGSERHAEUHUDOUUUUUTUUEUUUO
eve
UU
Video track
+
Hi-Fi sound
track
@
Incorporation
of
switching
noise
reduction
circuit
An
electronic
switching
circuit
and
an
active
filter
have
been
incorporated
in
the
noise
reduction
section
which
is
the
heart
of
the
audio
circuit.
Also
audio
capacitors
and
low-noise
resistors
are
used
in
the
level
sensor
section.
Asa
result,
noise
which
is
generated
when
the
audio
head
(Hi-Fi
head)
is
switched
has
been
greatly
reduced,
making
for
highly
linear,
pure,
clear
Hi-Fi
sound.
Audio Head Switched Timing
This unit Conventional system
<Switching noise>
Jog/Shuttle Search
@ Incorporates double DD reel motor
The tape runs smoothly in the forward and reverse
directions, and the mechanism has good response.
@ Variable speed playback by microprocessor
control
By using the shuttle dial, the playback speed can be varied
according to the angle of rotation of the dial, and by using
the jog dial, the playback speed can be varied according to
the direction and speed of rotation of the dial. This is
useful for frame alignment when searching for the editing
points.
Flying Erase (rotary erase) Head
This head is installed ahead of the recording head on the rotary
head cylinder. In other words, because only the track on which
the recording is to be made is erased by the erase head, there is
no noise or over-erasure, and clean simple recording and
insert editing can be done without any colour stripe beat being
produced.
Also, each rotating head is controlled by a microprocessor,
resulting in improved accuracy during editing.
Portion corresponding Portion corresponding
to beginning of recording to end of recording
— Tape travel direction| Signal has been
erased, hence blank
portion appears
Old recorded
portion
Newly recorded
portion
Erasing method
Newly recorded portion
Full erase using
fixed erase head
Colour strip
to overwriting of new
recording on old
—— Tape travel direction
Rotary erase head
Picture is joined cleanly
Flying erase due to
rotary head
Newly
recorded recorded
portion portion
Newly recorded portion