Sony Hi8 EVV-9000P Manual page 6

The 8mm video system uses metal tape, so it can record a
large amount of information and give enhanced picture
quality. The Hi8 video system is based on the 8mm video
system but has improved the picture quality.
High Quality Picture
In the Hi8 format, the luminance carrier frequency is shifted
up from 5.0 MHz of the standard 8mm format to 7.0 MHz at
center carrier level to realize more than 400 TV lines of
horizontal resolution. The FM deviation expanded from
1.2 MHz to 2.0 MHz greatly improves S/N ratio. Thus, the
EVV-S9000P offers such effects as recording more detailed
visual information and less noise at the edges of objects in
the picture.
In addition, the new TSS (Tilted Sendust Sputtered) head
achieves 2dB higher output than the conventional head, and
a new pre-emphasis system together with a high white clip
level (220%) can offer more precise reproduction.
Difference between 8mm and Hi8 Format
The chroma subcarrier frequency which carries
information on colors is kept unchanged at 732 kHz.
The frequency of the Y carrier is shifted up by 1.5 MHz,
and the deviation is widened to 2.0 MHz.
Frequency
deviation of
the standard 8mm __ of the Hi8
video system video system
1.2 MHz. 2.0 MHz
ATF pilot carriers
Luminance signal
=
; Chrominance
signal
oes
S
] 14 1
4.2 MHz 5.4 MHz ! '
5.7 MHz
' i
Subcarrier 4.5 MHz
732 kHz
Frequency deviation
7.7 MHz
Use of High Grade Tape
Corresponding to the Hi8 Video
System
Metal evaporated tape is ideal for video systems because it
has large magnetic energy that enables high-density
recording. The Hi8 video cassette recorder uses such high-
grade tape covering a wide frequency range, to achieve a
high-quality video signal for recording/playback.
ameter | urminance FM sideband of the standard
8mm video system
"+=! uminance FM sideband of the Hi8
video system
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