Mechanical TV Standards
In the late 1920s and early 30s, several mechanical TV transmission standards were being used. Here are the details on most of them:
|
Lines |
Frames/ Second |
Aspect Ratio (H:V)
|
Scan |
Direction (r=right, l=left, t=top, b=bottom) |
Sync |
Notes |
| 24 | 21 | ? | Progressive | l-r, t-b | ? | WGY, 2XAF, 2XAD |
| 30 | 12.5 | 3:7 | Progressive | r-l, b-t | Phonic | Baird, England, 1928-32 |
| 30 | 12.5 | 1:1 | Progressive | l-r, t-b | Phonic | Germany, France, 1930 |
| 36 | ? | ? | Progressive | l-r, t-b | ? | WRNY New York 1928 |
| 45 | 15 | 1:1 | Triple interlace | r-l, t-b | Synchronous | WIBO, WCFL, W9XK (Sanabria) midwest, 1929-32 |
| 48 | 7.5 | ? | Progressive | ? | ? | 2XAL New York 1928 |
| 48 | 10 | ? | Progressive | ? | ? | WRNY New York 1928 |
| 48 | 15 | 6:5 | Progressive | l-r, t-b | Synchronous | East coast, 1930-31 |
| 48 | 20 | ? | Progressive | ? | Synchronous | WGY (G.E.) |
| 60 | 20 | 6:5 | Progressive | l-r, t-b | Synchronous | East coast, 1930-32 |
| 80 | 20 | ? | Progressive | ? | ? | W6XS Los Angeles, 1931 |
| 96 | 20 | ? | Progressive | ? | ? | W6XAH Bakersfield, 1931 |