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CCIR System B

Analog TV systems global map, with System B in blue.

CCIR System B (originally known as the "Gerber Standard"[1][2][3][4]) was the 625-line VHF analog broadcast television system which at its peak was adopted by more than one hundred countries, either with PAL or SECAM colour.[5] It is usually associated with CCIR System G for UHF broadcasts.

System B was the first internationally accepted 625-line broadcasting standard in the world. A first 625-line system with a 8 MHz channel bandwidth was proposed at the CCIR Conference in Stockholm in July 1948 (based on 1946-48 studies in the Soviet Union[6] by Mark Krivosheev[7][8][9][10][11][12][13]).[3] At a CCIR Geneva meeting in July 1950 Dr. Gerber (a Swiss engineer), proposed a modified 625-lines system with a 7 MHz channel bandwidth (based on work by Telefunken and Walter Bruch), with the support of Belgium, Denmark, Italy, Netherlands, Sweden, Switzerland.[6] Known as the "Gerber-norm", it was eventually approved along with four other broadcast standards on the next formal CCIR meeting in May 1951 in Geneva.[6][14]

In the 1960s, the capital of Mexico, Mexico City decided to replace System B with 525-line CCIR System M, despite the recommendations of Guillermo González regarding the technical advantages of System B.

It is mostly replaced across Western Europe, former Yugoslavia, parts of Asia and Africa by digital broadcasting.

Specifications

The system was developed for VHF (also known as VHF-3) band (part of RF band lower than 300 MHz.) Some of the most important specs are listed below.[15]

Channel spacing for CCIR television System B (VHF Bands)
The separation between the aural and visual carriers is 5.5 MHz.

A frame is the total picture. The frame rate is the number of pictures displayed in one second. But each frame is actually scanned twice interleaving odd and even lines. Each scan is known as a field (odd and even fields.) So field rate is twice the frame rate. In each frame there are 625 lines (or 312.5 lines in a field.) So line rate (line frequency) is 625 times the frame frequency or 625•25=15625 Hz.

The video bandwidth is 5.0 MHz. The video signal modulates the carrier by amplitude modulation. But a portion of the lower side band is suppressed. This technique is known as vestigial side band modulation (AC3). The polarity of modulation is negative, meaning that an increase in the instantaneous brightness of the video signal results in a decrease in RF power and vice versa. Specifically, the sync pulses (being "blacker than black") result in maximum power from the transmitter.

The primary audio signal is modulated by frequency modulation with a preemphasis time constant of = 50 μs. The deviation for a 1.0 kHz. AF signal is 50 kHz.

The separation between the primary audio FM subcarrier and the video carrier is 5.5 MHz.

The total RF bandwidth of System B (as originally designed with its single FM audio subcarrier) was 6.5 MHz, allowing System B to be transmitted in the 7.0 MHz wide channels specified for television in the VHF bands with an ample 500 kHz guard zone between channels.[18]

In specs, sometimes, other parameters such as vestigial sideband characteristics and gamma correction of the display device are also given.

Colour TV

System B has variously been used with both the PAL or SECAM colour systems. It could have been used with a 625-line variant of the NTSC color system, but apart from possible technical tests in the 1950s, this has never been done officially.

When used with PAL, the colour subcarrier is 4.43361875 MHz and the sidebands of the PAL signal have to be truncated on the high-frequency side at +570 kHz (matching the rolloff of the luminance signal at +5.0 MHz). On the low-frequency side, the full 1.3 MHz sideband is radiated. (This behaviour would cause massive U/V crosstalk in the NTSC system, but delay-line PAL hides such artefacts.)

When used with SECAM, the 'R' lines' carrier is at 4.40625 MHz deviating from +350±18 kHz to -506±25 kHz. The 'B' lines' carrier is at 4.250 MHz deviating +506±25 kHz to -350±18 kHz.

Neither colour encoding system has any effect on the bandwidth of system B as a whole.

Improved audio

Enhancements have been made to the specification of System B's audio capabilities over the years. The introduction of Zweikanalton in 1981 allowed for stereo sound or twin monophonic audio tracks (possibly in different languages for instance). This was implemented by adding a second FM audio subcarrier at +5.74 MHz. Alternatively, starting in the late 1980s and early 1990s it became possible to replace the second audio FM subcarrier with a digital signal carrying NICAM sound. Either of these extensions to audio capability have eaten into the guard band between channels. Zweiton uses an extra 150 kHz. The alternative NICAM system uses an extra 500 kHz, and needs to be spaced further from the primary audio subcarrier, thus System B with NICAM has only 150 kHz guard zones between channels.

Transmission channels

Plan showing VHF frequency ranges for ITU Systems

The European 41-68 MHz Band I television allocation was agreed at the 1947 ITU (International Telecommunication Union) conference in 1947, and the first European channel plan (i.e. the use of channels E2 - E4) was agreed in 1952 at the ITU conference in Stockholm. The extension to VHF Band III (i.e. Channels E5 - E12) was also agreed in the 1950s.

Since then, the System B specification has been used with slightly different broadcast frequencies in many other countries.

Western Europe; Greenland; and most countries in Asia, Africa, and Oceania

Channel Channel limits (MHz) Vision carrier frequency (MHz) Main audio carrier frequency (MHz)
E1 † 40.00 - 47.00 41.25 46.75
E1A † 41.00 - 48.00 42.25 47.75
E2 § 47.00 - 54.00 48.25 53.75
E2A § 48.25 - 55.50 49.75 55.25
E3 54.00 - 61.00 55.25 60.75
E4 61.00 - 68.00 62.25 67.75
E4A 81.00 - 88.00 82.25 87.75

† Channel 1 was allocated, but never used.

§ Not used in the former East Germany

Channel Channel limits (MHz) Vision carrier frequency (MHz) Main audio carrier frequency (MHz)
E5 174.00 - 181.00 175.25 180.75
E6 181.00 - 188.00 182.25 187.75
E7 188.00 - 195.00 189.25 194.75
E8 195.00 - 202.00 196.25 201.75
E9 202.00 - 209.00 203.25 208.75
E10 209.00 - 216.00 210.25 215.75
E11 216.00 - 223.00 217.25 222.75
E12 223.00 - 230.00 224.25 229.75

East Germany before the 1960s

Channel Channel limits (MHz) Vision carrier frequency (MHz) Main audio carrier frequency (MHz)
1 58.00 - 65.00 59.25 64.75
Channel Channel limits (MHz) Vision carrier frequency (MHz) Main audio carrier frequency (MHz)
2 144.00 - 151.00 145.25 150.75
3 154.00 - 161.00 155.25 160.75
E5 174.00 - 181.00 175.25 180.75
E6 181.00 - 188.00 182.25 187.75
E8 195.00 - 202.00 196.25 201.75
E11 216.00 - 223.00 217.25 222.75

Transmitters were operational on the above channels in 1959. During the 1960s, channels 1 to 3 were deleted and channels E3 to E12 adopted, bringing East Germany into line with the channel allocations used in the West.

Italy

Italian channel-spacings were erratic. System B is no longer in use in Italy, the switchover to DVB-T having been completed 4 July 2012.

Channel Channel limits (MHz) Vision carrier frequency (MHz) Audio carrier frequency (MHz)
IA 52.50 - 59.50 53.75 59.25
IB 61.00 - 68.00 62.25 67.75
IC[a] 81.00 - 88.00 82.25 87.75
  1. ^ Same as E4A

Note: Band I is no longer used for television in Italy.

Channel Channel limits (MHz) Vision carrier frequency (MHz) Audio carrier frequency (MHz)
ID[a] 174.00 - 181.00 175.25 180.75
IE 182.50 - 189.50 183.75 189.25
IF 191.00 - 198.00 192.25 197.75
IG 200.00 - 207.00 201.25 206.75
IH[b] 209.00 - 216.00 210.25 215.75
IH1[c] 216.00 - 223.00 217.25 222.75
  1. ^ Same as E5
  2. ^ Same as E10
  3. ^ Same as E11

Note: Unusually for Europe, Band III is used for DVB-T in Italy. At digital switchover time, Italy took the opportunity to discontinue their erratic System B frequencies, and the digital channels (known as Ch5 through Ch12) are regularly-spaced every 7.0 MHz from 177.5 MHz (and identical to Germany's Band III DVB-T bandplan).

Australia VHF (until 1993)

Australia were unique in the world by their use of Band II for television broadcasting.

Channel Channel limits (MHz) Vision carrier frequency (MHz) Main audio carrier frequency (MHz)
D0 45.00 - 52.00 46.25 51.75
D1 56.00 - 63.00 57.25 62.75
D2 63.00 - 70.00 64.25 69.75
Channel Channel limits (MHz) Vision carrier frequency (MHz) Main audio carrier frequency (MHz)
D3 85.00 - 92.00 86.25 91.75
D4 94.00 - 101.00 95.25 100.75
D5 101.00 - 108.00 102.25 107.75
D5A 137.00 - 144.00 138.25 143.75
Channel Channel limits (MHz) Vision carrier frequency (MHz) Main audio carrier frequency (MHz)
D6 174.00 - 181.00 175.25 180.75
D7 181.00 - 188.00 182.25 194.75
D8 188.00 - 195.00 189.25 194.75
D9 195.00 - 202.00 196.25 201.75
D10 208.00 - 215.00 209.25 214.75
D11 215.00 - 222.00 216.25 221.75

Australia VHF (after 1993)

Channel Channel limits (MHz) Vision carrier frequency (MHz) Main audio carrier frequency (MHz)
D0 45.00 - 52.00 46.25 51.75
D1 56.00 - 63.00 57.25 62.75
D2 63.00 - 70.00 64.25 69.75
Channel Channel limits (MHz) Vision carrier frequency (MHz) Main audio carrier frequency (MHz)
D3 ‡ 85.00 - 92.00 86.25 91.75
D4 ‡ 94.00 - 101.00 95.25 100.75
D5 ‡ 101.00 - 108.00 102.25 107.75
D5A 137.00 - 144.00 138.25 143.75

‡ Channels 3, 4 and 5 were scheduled to be cleared during 1993–96 to make way for FM radio stations in Band II. This clearance action took much longer than was anticipated, and as a result, many stations on channel 3 still remain, along with a few on 4 and 5.

Channel Channel limits (MHz) Vision carrier frequency (MHz) Main audio carrier frequency (MHz)
D6 174.00 - 181.00 175.25 180.75
D7 181.00 - 188.00 182.25 194.75
D8 188.00 - 195.00 189.25 194.75
D9 195.00 - 202.00 196.25 201.75
D9A ♦ 202.00 - 209.00 203.25 208.75
D10 ‡ 209.00 - 216.00 210.25 215.75
D11 ‡ 216.00 - 223.00 217.25 222.75
D12 ♦ 223.00 - 230.00 224.25 229.75

♦ New channel allocations from 1993.

‡ Channels 10 and 11 were shifted up in frequency by 1 MHz to make room for channel 9A. The frequencies of existing stations did not change; only new ones used the new allocations. Digital multiplexes on channels 10 and 11 are using the new channel boundaries.

Australia UHF

Australia is nearly unique in the world for their use of 7 MHz channel-spacing (and therefore System B) on UHF.

Channel Channel limits (MHz) Vision carrier frequency (MHz) Main audio carrier frequency (MHz)
D28 526.00 - 533.00 527.25 532.75
D29 533.00 - 540.00 534.25 539.75
D30 540.00 - 547.00 541.25 546.75
D31 547.00 - 554.00 548.25 553.75
D32 554.00 - 561.00 555.25 560.75
D33 561.00 - 568.00 562.25 567.75
D34 568.00 - 575.00 569.25 574.75
D35 575.00 - 582.00 576.25 581.75
D36 582.00 - 589.00 583.25 588.75
D37 589.00 - 596.00 590.25 595.75
D38 596.00 - 603.00 597.25 602.75
D39 603.00 - 610.00 604.25 609.75
D40 610.00 - 617.00 611.25 616.75
D41 617.00 - 624.00 618.25 623.75
D42 624.00 - 631.00 625.25 630.75
D43 631.00 - 638.00 632.25 637.75
D44 638.00 - 645.00 639.25 644.75
D45 645.00 - 652.00 646.25 651.75
D46 652.00 - 659.00 653.25 658.75
D47 659.00 - 666.00 660.25 665.75
D48 666.00 - 673.00 667.25 672.75
D49 673.00 - 680.00 674.25 679.75
D50 680.00 - 687.00 681.25 686.75
D51 687.00 - 694.00 688.25 693.75
D52 694.00 - 701.00 695.25 700.75
D53 701.00 - 708.00 702.25 707.75
D54 708.00 - 715.00 709.25 714.75
D55 715.00 - 722.00 716.25 721.75
D56 722.00 - 729.00 723.25 728.75
D57 729.00 - 736.00 730.25 735.75
D58 736.00 - 743.00 737.25 742.75
D59 743.00 - 750.00 744.25 749.75
D60 750.00 - 757.00 751.25 756.75
D61 757.00 - 764.00 758.25 763.75
D62 764.00 - 771.00 765.25 770.75
D63 771.00 - 778.00 772.25 777.75
D64 778.00 - 785.00 779.25 784.75
D65 785.00 - 792.00 786.25 791.75
D66 792.00 - 799.00 793.25 798.75
D67 799.00 - 806.00 800.25 805.75
D68 806.00 - 813.00 807.25 812.75
D69 813.00 - 820.00 814.25 819.75

New Zealand and Indonesia

Channel Channel limits (MHz) Vision carrier frequency (MHz) Main audio carrier frequency (MHz)
G1A 43.00 - 50.00 44.25 49.75
G1 44.00 - 51.00 45.25 50.75
G2 54.00 - 61.00 55.25 60.75
G3 61.00 - 68.00 62.25 67.75
Channel Channel limits (MHz) Vision carrier frequency (MHz) Main audio carrier frequency (MHz)
G4 174.00 - 181.00 175.25 180.75
G5 181.00 - 188.00 182.25 187.75
G6 188.00 - 195.00 189.25 194.75
G7 195.00 - 202.00 196.25 201.75
G8 202.00 - 209.00 203.25 208.75
G9 209.00 - 216.00 210.25 215.75
G10 † 216.00 - 223.00 217.25 222.75
G11 ‡ 223.00 - 230.00 224.25 229.75

† Added for New Zealand in the 1980s.

‡ Added for New Zealand in the 1990s.

Note: The Band III frequencies are the same as Australia. Channel G1A is only used in Indonesia.

Morocco

Channel Channel limits (MHz) Vision carrier frequency (MHz) Main audio carrier frequency (MHz)
M4 162.00 - 169.00 163.25 168.75
M5 170.00 - 177.00 171.25 176.75
M6 178.00 - 185.00 179.25 184.75
M7 186.00 - 193.00 187.25 192.75
M8 194.00 - 201.00 195.25 200.75
M9 202.00 - 209.00 203.25 208.75
M10 210.00 - 217.00 211.25 216.75

System G and H

When the UHF bands came into use in the early 1960s, two variants of System B began to be used on those frequencies.

In most countries, the channels on the UHF bands are 8 MHz wide, but in most system B countries transmissions on the UHF channels still use system B specifications, the only difference being that the guard band between the channels is 1.0 MHz wider than for System B. That system for the UHF bands is known as System G and all RF specifications given above (apart from the guard band width) also apply to system G. Exceptions to this would seem to be Australia, Brunei and Tanzania where the UHF channels are 7 MHz wide, and system B is used on UHF just as it is on VHF.

A few countries (Belgium, several of the Balkan states and Malta) use another variant of system B on UHF which is known as System H. System H is similar to system G but the lower (vestigial) side band is 500 kHz wider. This makes much better use of the 8.0 MHz channels of the UHF bands (though whether any system B/H televisions actually made use of the extra bandwidth is not known).

See also

Notes and references

  1. ^ "625-Line Television Broadcast Standards - UK Vintage Radio Repair and Restoration Discussion Forum".
  2. ^ "405 Alive - FAQ - 405-Line Television in History". www.bvws.org.uk.
  3. ^ a b "The CCIR, the standards and the TV sets' market in France (1948-1985)" (PDF).
  4. ^ Magnetic Recording Handbook. Springer Science & Business Media. December 6, 2012. ISBN 9789401094689 – via Google Books.
  5. ^ "Weltweite Fernsehsysteme (NTSC, PAL und SECAM)". www.paradiso-design.net. 2005. Retrieved 2023-03-06.[permanent dead link‍]
  6. ^ a b c "Piet's Home-built Television". Maximus R&D.
  7. ^ ""M.I. Krivosheev: Participation in the development of mass TV broadcasting" - an exhibition at Ostankino TV Center".
  8. ^ "Mark Iosifovich Krivosheev (1922-2018)".
  9. ^ On the beginning of broadcast in 625-lines 60 year s ago, 625 magazine (in Russian). Archived 2016-03-04 at the Wayback Machine
  10. ^ M.I. Krivocheev – an engineer's engineer, EBU's technical review.
  11. ^ In the vanguard of television broadcasting
  12. ^ Observer, Reflective (2021-12-23). "Where did 625-line TV come from?". Medium. Retrieved 2021-12-31.
  13. ^ "625-Line Television System Origins - UK Vintage Radio Repair and Restoration Discussion Forum". www.vintage-radio.net. Retrieved 2021-12-31.
  14. ^ "World map showing the different line standards for black and white television after the CCIR Plenary Conference in Stockholm in 1952. Source: Rindfleisch, Hans, 'Der gegenwärtige Ausbau des Fernsehrundfunks im In-und Ausland', Rundfunktechnische Mitteilungen, 3, 1959, p.220".
  15. ^ Reference Data for Radio Engineers, ITT Howard W.Sams Co., New York, 1977, section 30
  16. ^ Not an independent value: 25 Hz•2=50 Hz
  17. ^ Not an independent value: 25 Hz•625=15.625 kHz
  18. ^ Nedim Ardoğa:TV Verici tekniğine giriş p.34

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