Closed shenglin00 closed 1 year ago
fsphil
commented
1 year ago Thanks for this, and I agree these standards are all a bit of a mess :-) I'd prefer these variations where added as separate modes, rather than having dedicated arguments that affect a specific mode.
shenglin00
commented
1 year ago Thank you for review! I think it is not appropriate to list them all as separate modes. If we list all of them, we need to add at least four new modes, the PAL-D/K (OIRT), PAL-D (China), PAL-D1 (Poland), and PAL-D/K (with A2-BG stereo subcarrier). If we add SECAM-D/K, two new modes are needed, SECAM-D/K (A2-DK2) and SECAM-D/K (A2-DK3).
As shown in the table below, the modes marked in bold italic (basically A2-DK2 and A2-DK3) are rarely used. However, because they have both been used for a short period, most TV sound processor chips support them.
What do you think about adding an argument --a2stereo-freq, to tune the frequency of the A2 subcarrier in system already have formal standards and provide the frequency in systems that don't have a standard?
| Country | Color system | NICAM | A2 Stereo | Note & Ref |
|---|---|---|---|---|
| China | PAL-D | NICAM-DK / 5.85 / -10 / -25±3 | A2-DK2 / 6.742 / -13 / -20 | PAL broadcasting started from 1973 the A2 Stereo standard was released, but not be used in practical broadcasting |
| Czech/Slovakia | PAL-D/K | - | A2-DK1 / 6.258 / -13 / -20 | SECAM to PAL transition started from 1992, according to D. Liska, K. Trpak and P. Gregora, "Prague TV centre on the way from PAL/SECAM to digital broadcasting," International Broadcasting Convention (Conf. Publ. No. 428), Amsterdam, Netherlands, 1996, pp. 419-424, doi: 10.1049/cp:19960845. |
| Poland | PAL-D1 | NICAM-DK / 5.85 / -13 / -20 | A2-DK1 / 6.258 / -13 / -20 | SECAM to PAL transition started from 1993, according to EBU I33-1997 |
| Poland | PAL-D/K† | - | A2-DK1 / 6.258 / -13 / -20 | be used in some cable networks before 1997 †.may also have SECAM versions ref: https://elhu.pl/standtv.html |
| Poland | PAL-D/K† | - | A2-DK2 / 6.742 / -13 / -20 | same as above |
| Poland | PAL-D/K† | - | A2-DK3 / 5.742 / -13 / -20 | same as above |
| Hungary | SECAM-D/K -> PAL-D(?)/B1/G | NICAM-BG / 5.85 / -13 / -20 | - | not NICAM-DK, according to EBU I33-1997 |
| Russia | SECAM-D/K | NICAM-DK / 5.85 / -10 / -27* ( -25** ) | - | *. from ITU-R BS.707 **. MTV Russia tested in 2003 ref: http://lib.broadcasting.ru/articles2/Oborandteh/nicam728 |
| Czech/Slovakia | SECAM-D/K | - | A2-DK1 / 6.258 / -13 / -20 | SECAM broadcasting from 1973 to 1994 |
Following Czech technical standard CSN 367523 and Chinese standard GB/T 9308. btw, the PAL-D/K system, or "systems", is totally a mess :)