FORMAT MII (IEC 60B (Sec) 191)
A ½-inch professional format based on a metal particle tape cassette conforming to the VHS outline. The earlier M-l system, not widely used in PAL, used frequency multiplexing to accommodate luminance and chrominance components on the same tape track. M-ll uses one track for the luminance and a second track for the two time-compressed colour difference signals. The format includes two longitudinal analogue and two FM audio channels.
| Signal system |
| Analogue, component. |
| Scanner |
| Geometry |
Helical |
| No. of rotating heads |
10 (typical) |
|
| Scanner diameter |
75.9 |
mm |
| Rotation speed |
25 |
rev/s |
| Tracks/revolution |
4 |
|
| Head-to-tape speed |
5.9 |
m/s |
| Video track angle |
|
degree |
| |
Video |
Chroma |
|
| Track width |
56 |
36 |
µm |
| Track pitch |
56 |
36 |
µm |
| Azimuth |
+15 |
-15 |
degree |
| Tape Properties |
| Coercivity |
1500 |
Oe |
| Type |
Metal particle |
| Width |
12.65 |
mm |
| Thickness (total) |
14 |
µm |
| Tape Consumption |
| Linear |
66.295 |
mm/s |
| Areal |
0.05 |
m²/min |
| Shelfvolume |
483 |
cm³/h |
| Electrical Characteristics |
| |
Video |
Chroma |
|
| Sync tip carrier frequ. |
6.63 |
4.71 |
MHz |
| Blanking |
7.40 |
|
MHz |
| Peak white |
9.20 |
6.20 |
MHz |
| Peak positive video |
|
7.00* |
MHz |
| Peak negative video |
|
5.40* |
MHz |
| Shortest wavelength |
0.64 |
|
µm |
* For 100% colour bars. IEC 60B (Sec) 191
