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From Wikipedia, the free encyclopedia

CCIR System D is an analog broadcast television system used in the Commonwealth of Independent States, parts of Eastern Europe and People's Republic of China.[1][2]

Initially known as the I.B.T.O. 625-line system this was the first 625-line system, developed by Mark Iosifovich Krivosheev in 1948,[3][4] and later associated with the SECAM and PAL color systems. Used on VHF only in most countries, it's usually combined with system K on UHF. In China it is used for both VHF and UHF.

Specifications

Some of the important specs are listed below:

System D specifications
Frame rate Interlace Field rate Line/frame Line rate Visual b/w Vision mod. Preemphasis Sound mod. Sound offset Channel b/w
25 2/1 50 625 15625 6 MHz. Neg. FM +6.5 MHz. 8 MHz.
Plan showing VHF frequency ranges for ITU Systems
Plan showing VHF frequency ranges for ITU Systems

Television channels were arranged as follows:[5][6]

Original OIR assignments
System D 625 lines
Channel Video carrier (MHz) Audio carrier (MHz)
I 41.75 48.25
II 49.75 56.25
III 59.25 65.75
IV 77.25 83.75
1 145.25 151.75
2 153.25 159.75
3 161.25 167.75
4 169.25 175.75
5 177.25 183.75
6 185.25 191.75
7 193.25 199.75
8 201.25 207.75
9 209.25 215.75
Assignments since 1965
System D 625 lines
Channel Video carrier (MHz) Audio carrier (MHz)
1 49.75 56.25
2 59.25 65.75
3 77.25 83.75
4 85.25 91.75
5 93.25 99.75
6 175.25 181.75
7 183.25 189.75
8 191.25 197.75
9 199.25 205.75
10 207.25 213.75
11 215.25 221.75
12 223.25 229.75
Channel arrangement for China
Channel Frequency range (MHz) Video carrier (MHz) Audio carrier (MHz) DTMB center frequency (MHz)
Band I
1 48.5-56.5 49.75 56.25 52.5
2 56.5-64.5 57.75 64.25 60.5
3 64.5-72.5 65.75 72.25 68.5
4 76-84 77.25 83.75 80
5 84-92 85.25 91.75 88
Band III
6 167-175 168.25 174.25 171
7 175-183 176.25 182.75 179
8 183-191 184.25 190.75 187
9 191-199 192.25 198.75 195
10 199-207 200.25 206.75 203
11 207-215 208.25 214.75 211
12 215-223 216.25 222.75 219
System D 625 lines
Ch Video (MHz) DTMB (MHz) Audio (MHz)
13 471.25 474 477.75
14 479.25 482 485.75
15 487.25 490 493.75
16 495.25 498 501.75
17 503.25 506 509.75
18 511.25 514 517.75
19 519.25 522 525.75
20 527.25 530 533.75
21 535.25 538 541.75
22 543.25 546 549.75
23 551.25 554 557.75
24 559.25 562 565.75
25 605.25 610 611.75
26 613.25 618 619.75
27 621.25 626 627.75
28 629.25 634 635.75
29 637.25 642 643.75
30 645.25 650 651.75
31 653.25 658 659.75
32 661.25 666 667.75
33 669.25 674 675.75
34 677.25 682 683.75
35 685.25 690 691.75
36 693.25 698 699.75
37 701.25 706 707.75
38 709.25 714 715.75
39 717.25 722 723.75
40 725.25 730 731.75
41 733.25 738 739.75
42 741.25 746 747.75
43 749.25 754 755.75
44 757.25 762 763.75
45 765.25 770 771.75
46 773.25 778 779.75
47 781.25 786 787.75
48 789.25 794 795.75
49 797.25 802 803.75
50 805.25 810 811.75
51 813.25 818 819.75
52 821.25 826 827.75
53 829.25 834 835.75
54 837.25 842 843.75
55 845.25 850 851.75
56 853.25 858 859.75
57 861.25 866 867.75
58 871.25 874 877.75
59 879.25 882 885.75
60 887.25 890 893.75
61 895.25 898 901.75
62 903.25 906 909.75
  • The original assignments of channels 25 to 57 were 2 MHz higher in frequency until c.1984. Channels 58 to 62 were deleted at this time.

See also

References

  1. ^ Report 624-4 Characteristics of television systems (PDF). UIT. 1990.
  2. ^ "World Analogue Television Standards and Waveforms". August 30, 2012. Archived from the original on 30 August 2012.
  3. ^ ""M.I. Krivosheev: Participation in the development of mass TV broadcasting" - an exhibition at Ostankino TV Center".
  4. ^ "Mark Iosifovich Krivosheev (1922-2018)".
  5. ^ "Archived copy". www.pembers.freeserve.co.uk. Archived from the original on 30 August 2012. Retrieved 12 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)
  6. ^ "Archived copy". www.pembers.freeserve.co.uk. Archived from the original on 30 August 2012. Retrieved 12 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)

External links

This page was last edited on 4 August 2022, at 22:21
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