D3-FORMAT
A composite digital recording system using linear 8-bit sampling at 4fSc and ½-inch metal particle tape. The small cassette offers 64 minutes playing time and the large 125 minutes. An extra large cassette provides 245 minutes.
The format includes 4 digital audio channels with 48 kHz sampling and 16 to 20 bit quantising. The video signal processing is similar to that of D2. Azimuth recording is used with guard bands when editing.
| Signal system |
| Digital composite video with digital audio. |
| Scanner |
| Geometry |
Helical |
|
| No. of rotating heads |
10 |
|
| Scanner diameter |
76.0 |
mm |
| Rotation speed |
100 |
rev/s |
| Tracks/revolution |
4 |
|
| Head-to-tape speed |
23.88 |
m/s |
| Video track angle |
4.9173 |
degree |
| Track width |
18 |
µm |
| Track pitch |
18 |
µm |
| Azimuth |
±20 |
degree |
| Tape Properties |
| Coercivity |
1500 |
Oe |
| Type |
Metal particle |
| Width |
12.65 |
mm |
| Thickness (total) |
11 or 14 |
µm |
| Tape Consumption |
| Linear |
83.88 |
mm/s |
| Areal |
0.064 |
m²/min |
| Shelf volume |
315 |
cm³/h |
| Electrical Characteristics |
| Shortest wavelength |
0.71 |
µm |
| Input data rate |
142 vid 3.85 aud |
Mbit/s |
| Packing density |
3226 |
bit/mm |
