ITU-T J 63-1990 Insertion of Test Signals in the Field-Blanking Interval of Monochrome and Colour Television Signals - Television and Sound Transmission (Formerly Recommendation IT.pdf

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1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU J.63 (ex CMTT.473) 06/90 TELEVISION AND SOUND TRANSMISSION INSERTION OF TEST SIGNALS OF MONOCHROME AND COLOUR TELEVISION SIGNALS IN THE FIELD-BLANKING INTERVAL ITU-T Recommendation J.63 (Formerly Recommendati

2、on ITU-R CMTT.473) FOREWORD The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the International Telecom- munication Union. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing t

3、elecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, established the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. ITU-T Recommendation 5.63 (formerly Recommend

4、ation ITU-R CMTT.473) was elaborated by the former ITU-R Study Group CMTT. See Note 1 below. NOTES 1 As a consequence of a reform process within the International Telecommunication Union (ITU), the CCITT ceased to exist as of 28 February 1993. In its place, the ITU Telecommunication Standardization

5、Sector (ITU-T) was created as of 1 March 1993. Similarly, in this reform process, the CCIR and the IFRB have been replaced by the Radiocommunication Sector (ITU-R). Conforming to a joint decision by the World Telecommunication Standardization Conference (Helsinki, March 1993) and the Radiocommunicat

6、ion Assembly (Geneva, November 1993), the ITU-R Study Group CMTT was transferred to ITU-T as Study Group 9, except for the satellite news gathering (SNG) study area which was transferred to ITU-R Study Group 4. 2 telecommunication administration and a recognized operating agency. In this Recommendat

7、ion, the expression “Administration” is used for conciseness to indicate both a O ITU 1990 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from th

8、e ITU. STD-ITU-T RECMN J*b3-ENGL 1990 m 48b2571 Ob30Lb3 LOb m Recommendation 5.63l) *) INSERTION OF TEST SIGNALS IN THE FIELD-BLANKING INTERVAL OF MONOCHROME AND COLOUR TELEVISION SIGNALS (1970; revised in 1974, 1978, 1982, 1986 and 1990) The CCIR, CONSIDERTNG (4 interval of monochrome and colour te

9、levision signals; (6) of characteristics of international transmission circuits; (4 signals for international transmissions; (4 signals, to an accuracy approaching that of conventional out-of-service measuring methods, that it is already current practice in a number of countries to use insertion tes

10、t signals in the field-blanking that such signals can be used for the measurement of performance and the monitoring, control and correction that Report 314 proposes that certain specific lines in each field be allocated for the insertion of special test that traffic demands may make it necessary to

11、perform all operational measurements by means of insertion test UNANIMOUSLY RECOMMENDS that for the international transmission of television signals, insertion test signals in accordance with Annex I Note. - As an interim measure some administrations may decide to omit some of the waveforms describe

12、d. Where 1. (625-line systems) and Annex II (525-line systems) may be inserted at the origin of the circuit; waveforms are omitted: - - waveforms other than those described should not be inserted; care must be taken to ensure that the line-time luminance components of equivalent lines in each field

13、(e.g. 17 and 330 for 625-line systems) are similar. that these signals should neither be removed nor replaced on the international circuit, except possibly at a point 2. of conversion of either standard or colour system. ANNEX I 625-LINE SYSTEMS i. Introduction the use of lines 17 (330) and 18 (331)

14、 for insertion test signals. general considerations apply: - For the international transmission of 625-line television signals, Recommendation 472 and Report 3 14 propose This Annex describes a comprehensive arrangement of insertion test signals (see Note) to which the following it is assumed that t

15、he line duration H is divided into 32 equal time periods. This division defines the characteristic instants; the time periods shall not differ from each other by more than f 40 ns; the characteristic instants are referred to the mid-amplitude point of the leading edge of the synchronizing pulse. The

16、 half-amplitude points of the luminance and chrominance transitions and the peaks of the pulses occur at the characteristic instants; - - i) Formerly Recommendation ITU-R CMTT.473. 2, ITU-T Recommendation N.67 has been amended to bring it into agreement with this Recommendation. Recommendation 5.63

17、(06190) 1 - the actual characteristic instants of any luminance waveform shall not differ by more than 250 ns from their nominal positions; except in the case of the 20T composite pulse, the actual characteristic instants of any chrominance waveform shall not differ by more than 500 ns from their no

18、minal positions; the colour burst is present in the line-blanking period only in colour transmission; in the case of PAL transmissions, the chrominance sub-carrier of the insertion signals is locked at 60 f 5“ from the positive (B-Y) axis; harmonic distortion components of the sub-carrier shall be a

19、t least 40 dB below the level of the fundamental; the frequency of the sub-carrier is 4.433 61 8 75 MHz f 10 Hz. - - - - - Note. - These are intended for use with colour television signals. The basic insertion test signal for monochrome Line 17: element F is omitted; Line 18: the luminance pedestal

20、and elements Cl and C2 are omitted; Line 330: element 02 is replaced by DI; Line 33 1 :the luminance pedestal and elements G and E are omitted. The following additions to the basic monochrome insertion test signal may be found useful: (a) the luminance pedestal on lines 18 and 33 1 and elements C1 a

21、nd C2 on line 18 transmissions is identical, with the following exceptions: andor (b) the element F on line 17. Alternatively, the whole of the signals may be utilized. The above modifications to the basic monochrome insertion test signal should, however, only be made with the agreement of the admin

22、istrations concerned. 2. 2.1 - - - - overshoot and undershoot 50.5%; - tilt 50.5%. 2.2 2T sine-squaredpulse (BI) - peak position: 13Hl32; Particulars of signals inserted in line 17 (Fig. 1) Luminance bar (reference white level) (B2) position of transitions: 6Hl32 and 11Hl32, duration of bar 5Hl32; b

23、ar amplitude: 0.700 f 0.007 V; rise and fall times of transitions: derived from the shaping network of the sine-squared pulse (element Bi); - - amplitude: within f 1% of the amplituc, o ,he luminance bar (B2) (nominal value: 0.700 V); half-amplitude duration: 200 f 10 ns (see Note). Note. - In some

24、countries, members of the OIRT, the half-amplitude duration of the 2T sine-squared pulse may be 160 ns. 2.3 Composite 20TpuIse (F) - position of peak: 16Hl32; - - - - position of base: 15H/32 - 17Hl32; amplitude: within f 1% of the amplitude of the luminance bar (4) (nominal value: 0.700 V); half-am

25、plitude duration: 2 f 0.06 ps; perturbations of the pulse base-line, due to inherent chrominance-luminance amplitude and delay inequalities and different shape of the luminance and chrominance components: I 0.5% peak amplitude. 2.4 - - Five-riser luminance staircase (DI) (see Note) position of succe

26、ssive transitions: 20H132,22H132, 24H132,26Hl32,28Hl32 and 3 1Hl32 (fall); peak-to-peak amplitude of the staircase: within i 1% of the amplitude of the luminance bar (B2) (nominal value: 0.700 V); 2 Recommendation 5.63 (06190) STD*ITU-T RECMN J-bI-ENGL 1990 4Bb259L Ob30Lb5 TA9 - nominal amplitude of

27、 risers: 1/5 of amplitude of the luminance bar (B2) (nominal value: 0.140 V). The difference in amplitude between the largest and smallest risers must be less than 0.5% of the largest amplitude; - rise and fall times of transitions: shaped by a Thomson filter (or similar network) with a transfer fun

28、ction modulus having its first zero at 4.43 MHz to restrict the amplitude of components of the luminance signal in the vicinity of the colour sub-carrier. Note. - Some adminihations may wish to superimpose a chrominance sub-carrier signal on this staircase. In this case, the position and duration of

29、 the sub-carrier are determined by instants 18H132 and 31H/32. The other characteristics of this signal are identical to those described in $ 4.3.2. V 1 L ow 0.n 051 0.44 M F i D, I i % 3. Particulars of signals inserted in line 18 (Fig. 2) 3.1 Luminance pedestal - position of transitions: 6Hl32, 3

30、i Hl32; - amplitude measured from blanking level: within I 1% of one-half of the amplitude of luminance bar (B2) (nominal value: 0.350 V); 3.2 Reference bar signal (CI) - position of transitions: 6Hl32, 8Hl32, 10HI32; - amplitudes measured from blanking level: Ist section: within I 1% of four-fifths

31、 of the amplitude of the luminance bar (B2) (nominal value: 0.560 V); 2nd section: within I 1% of one-fifth of the amplitude of the luminance bar (B2) (nominal value: 0.140 V); - rise and fall times of transitions: derived from the shaping network of the sine-squared pulse (element BI). Recommendati

32、on 5.63 (06/90) 3 3.3 - Sine-wave signals superimposed on the pedestal (Cz) starting positions and frequencies of the bursts (see Table I); Burst No. TABLE I Precise starting Frequency position (I) (2) MHz(3) AIW- CL65 0.44 0.30 12Hl32 15Hl32 18Hl32 21H32 24Hl32 27Hl32 - - - 0- 0.5 1.0 (4) 2.0 (4) 4

33、.0 4.8 5.8 (I) The starting point of each burst shall be at zero phase of the sine-wave, and each burst shall consist of the maximum number of complete cycles. The gaps between successive bursts shall not be shorter than 0.4 ps nor longer than 2.0 ps in duration. (2) Some administrations may prefer

34、to use burst durations different from those shown above and in Fig. 2. (3) Spectral components of the bursts may cause interference to sub-carriers or noise detection circuits and the out of band energy should be limited by suitable design techniques. Other frequencies near to the above mentioned ma

35、y be used, subject to an agreement between the administrations concerned. (4) In some countries, members of the OIRT, the frequencies of bursts Nos. 2 and 3 may be 1.5 MHz and 2.8 MHz respectively. - the peak-to-peak amplitude of bursts shall be within k 1% of the peak-to-peak amplitude of the refer

36、ence bar signal (CI) (nominal value: 0.420 V); the d.c. component of each burst shall not exceed 0.5% of the amplitude of the reference bar signal (CI); the harmonic distortion components of each burst are to be at least 40 dB (see Note) below the fundamental. - - Note. -This value is subject to fur

37、ther study. % BO 10 20 O -43 O 6 8 IO 12 15 18 21 24 21 FIGURE 2 - LNie 18 dO2-sc 4 Recommendation 5.63 (06/90) 4. 4.1 - - - - - tilt IO.5%. Particulars of signals inserted in line 330 (Fig. 3) Luminance bar (reference white level) (4) position of transitions: 6H32 and 11H32, duration of bar 5H32; b

38、ar amplitude: 0.700 f 0.007 V; rise and fall times of transitions: derived from the shaping network of the sine-squared pulse (element Bi); overshoot and undershoot I 0.5%; 4.2 2Tsine-squaredpulse (BI) - peak position: 13 H32; - - amplitude: within f 1% of the amplitude of the luminance bar (Bz) (no

39、minal value: 0.700 V); half-amplitude duration: 200 tr 1 O ns. (In some countries, members of the OIRT, the half-amplitude duration of the 2Tsine-squared pulse may be 160 ns.) 4.3 Five-riser luminance siaircase (Di) and superimposed fwe-riser staircase (02) 4.3.1 - - The five-riser luminance stairca

40、se has the following characteristics: position of successive transitions: 20H/32,22H32,24H/32,26H/32,28H32 and 3 1H32 (fail); peak-to-peak amplitude of the staircase: within f 1% of the amplitude of the luminance bar (82) (nominal value: 0.700 V); nominal amplitude of risers: 115 of amplitude of the

41、 luminance bar (B2) (nominal value: 0.140 V). The difference in amplitude between the largest and smallest risers must be less than 0.5% of the largest amplitude; rise and fail times of transitions: shaped by a Thomson filter (or similar network) with a transfer function modulus having its first zer

42、o at 4.43 MHz to restrict the amplitude of components of the luminance signai in the vicinity of the colour sub-carrier. The chrominance signal superimposed on the five-riser luminance staircase (Di) has the following - - 4.3.2 characteristics: - - - - - Particulars of signals inserted in line 331 (

43、Fig. 4) position and duration: 15H32 to 30H32. The superimposed sub-carrier may be limited to 28H32; peak-to-peak amplitude: 0.280 V f 2%; inherent differential-gain distortion: I 0.5%; inherent differential-phase distortion: I 0.2“; rise and fall times of the envelope of the chrominance transition:

44、 1 ps approximately. 5. 5.1 Luminance pedestal - position of transitions: 6H/32,31H32; - amplitude measured from blanking level: within f 1% of one-half of the amplitude of the luminance bar (B2) (nominal value: 0.350 V); rise and fall times of transitions: derived from the shaping network of the si

45、ne-squared pulse (element BI). - 5.2 - - - - - Superimposed chrominance bar signal (GI) position of transitions: 71-3/32, 14H32; peak-to-peak amplitude: within f 1% of the amplitude of the luminance bar (B2) (nominal value: 0.700 V); rise and fall times of the envelope of the chrominance signal tran

46、sactions: 1 ps approximately; inherent chrominance-luminance cross-talk: I 0.5% of luminance pedestal amplitude; phase difference between the sub-carrier superimposed on the staircase in line 330 and the sub-carrier superimposed on line 33 1: I2O. Recommendation 5.63 (06/90) 5 STD-ITU-T RECMN J-bY-E

47、NGL 1770 qBb257L Ob301b8 798 1.u IPO 0.s 0.72 o58 0.44 O30 0.16 O!- - - - - - -. - - L i x 20 30 Bo 60 40 N O 20 43 5.3 Superimposed three-level chrominance signal (G2) This signal may be used as an alternative to the superimposed chrominance bar signal defined above: - - peak-to-peak amplitudes: po

48、sition of transitions: 7Hl32, 9Hl32, 1 1 Hl32 and 14H132; 1st section: within k 1% of one-fifth of the amplitude of the luminance bar (B2) (nominal value: 0.140 V); 2nd section: within f 1% of three-fifths of the amplitude of the luminance bar (B2) (nominal value: 0.420 V); 3rd section: within * 1%

49、of the amplitude of the luminance bar (B2) (nominal value: 0.700 V); - rise and fall times of the envelope of the chrominance signal transitions: 1 ps approximately; - - inherent chrominance-luminance cross-talk: I 0.5% of luminance pedestal amplitude; inherent phaselamplitude distortion: I 0.5“; - phase difference between the sub-carrier superimposed on the staircase in line 330 and the sub-carrier superimposed on line 331: 52“. 5.4 Superimposed reference sub-currier (E) This auxiliary signal may be used as a reference sub-carrier for the measurement of differential