Their standards are different as shown on Table 1 to 3.
As to t h e principle of TV, refer to the Additional Service
M a n u a l s , ARP-675 for SD-25 (NTSC) and ARP-928 for
SD-26 ( P A L ) .
V C R is a device for recording TV signal on tape for
reproduction. TV signal is composed of luminance(Y)- and /
chr ominance(C)-signals, vertical(V)- and horizontal(H)-
synchronizing(sync)-signals and audio signal. Although the
basic functions of VCR are similar to those of A C R , there
are some i m p o r t a n t differences. T h e m a i n differences
between the VCR and A C R are in frequency b a n d w i d t h ,
recording a n d playback method, synchronization a n d
signal format.
8 m m
(3 (NTSC)
VHS(NTSC)
Remark
NTSC PAL jSI
0II
SP
EP
Remark
Drum diameter (mm)
4 0
7 4 . 5
6 2
Cassette dimensions (mm)
9 5 x 6 2 . 5 x 1 5
1 5 6 x 9 6 x 2 5
1 8 8 x 1 0 4 x 2 5
Tape w i d t h (mm)
8
1 2 . 6 5
1 2 . 6 5
Tape speed (m/sec)
1 4 . 3 4 5
2 0 . 0 5 1
4 0
2 0
1 3 . 3
3 3 . 3 5
1 1 . 1 1 6
Writing speed (mm/sec)
3.8
3.1
6 . 9 7 3
6 . 9 9 3
7 . 0 0
Time (min)
9 0
6 0
6 0
1 2 0
3 0 0
(L-830)
1 2 0
3 6 0
Video effective w i d t h (mm)
5 . 3 5 1
10.2
7
Video track w i d t h (^m)
2 0 . 5
3 4 . 4
5 8 . 5
2 9 . 2
1 9 . 5
5 8
19.2
Video track angle (Stop)
4 ° 5 3 ' 6 "
5 ° 0 0 ' 0 0 "
5 ° 5 6 ' 7 . 4 "
Video track angle (Play)
4 ° 5 4 ' 1 3 . 2 "
4 ° 5 4 ' 5 8 . 8 "
5 ° 0 1 ' 4 2 "
-
-
5 ° 5 8 ' 9 . 9 " -
Video recording
2-head azimuth
Guard-bandless
Video head azimuth
± 1 0 °
± 7 °
± 6 °
Cross Talkover 1 MHz
Y-signal recording
FM
FM carrier
W h i t e peak (MHz)
5.4
4 . 8 (5.2 Hi-fi)
4 . 4
Sync tip (MHz)
4 . 2
3.6 (4.0 Hi-fi)
3.4
Deviation (MHz)
1.2
1.2
1.0
Resolution (lines)
2 4 0
2 5 0 ( 2 4 0 Hi-fi)
2 4 0
fa/2 carrier offset
ON
OFF
ON
ON
OFF
ON
Against Y cross talk
H-alignment
+ 1H
+ 2H
0 . 7 5 H
*
•*•
^Aligned
C-signal recording
Frequency d o w n - c o n v e r s i o n
Freq. converted (kHz)
7 4 3 . 4 4 4
7 3 2 . 4 2 2
6 8 8 . 3 7 4
6 2 9 . 3 7 1
Phase process
PI (CH2)
PS
PI (CH1)
PS
Burst emphasis
ON
OFF
OFF
ON
ON
C-emphasis
ON
OFF
OFF
Carrier
(47 + 1 / 4 ) f H
( 4 7 - 1 / 8 ) f
H
4 3 ( 3 / 4 ) f
H
4 0 f
H
Table 1 Specifications of 1 / 2 " and 8mm VCRs (Video)
28
