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(ITU) ﻟﻼﺗﺼﺎﻻﺕ ﺍﻟﺪﻭﻟﻲ ﺍﻻﺗﺤﺎﺩ ﻓﻲ ﻭﺍﻟﻤﺤﻔﻮﻇﺎﺕ ﺍﻟﻤﻜﺘﺒﺔ ﻗﺴﻢ ﺃﺟﺮﺍﻩ ﺍﻟﻀﻮﺋﻲ ﺑﺎﻟﻤﺴﺢ ﺗﺼﻮﻳﺮ ﻧﺘﺎﺝ (PDF) ﺍﻹﻟﻜﺘﺮﻭﻧﻴﺔ ﺍﻟﻨﺴﺨﺔ ﻫﺬﻩ .ﻭﺍﻟﻤﺤﻔﻮﻇﺎﺕ ﺍﻟﻤﻜﺘﺒﺔ ﻗﺴﻢ ﻓﻲ ﺍﻟﻤﺘﻮﻓﺮﺓ ﺍﻟﻮﺛﺎﺋﻖ ﺿﻤﻦ ﺃﺻﻠﻴﺔ ﻭﺭﻗﻴﺔ ﻭﺛﻴﻘﺔ ﻣﻦ ﻧﻘﻼ ً◌ 此电子版（PDF版本）由国际电信联盟（ITU）图书馆和档案室利用存于该处的纸质文件扫描提供。 Настоящий электронный вариант (PDF) был подготовлен в библиотечно-архивной службе Международного союза электросвязи путем сканирования исходного документа в бумажной форме из библиотечно-архивной службы МСЭ. © International Telecommunication Union INTERNATIONAL RADIO CONSULTATIVE COMMITTEE C.C.I.R. Xllth PLENARY ASSEMBLY NEW DELHI, 1970 VOLUME V PART 2 BROADCASTING SERVICE (TELEVISION) (STUDY GROUP 11) TRANSMISSION OF SOUND BROADCASTING AND TELEVISION SIGNALS OVER LONG DISTANCES (CMTT) Published by the INTERNATIONAL TELECOMMUNICATION UNION GENEVA, 1970 COVERING NOTE GENERAL SECRETARIAT INTERNATIONAL TELECOMMUNICATION UNION qeneve, 16 July 1973 Subject: Documents of the . PLACE DES NATIONS Xllth Plenary Assembly of the C.C.I.R. New Delhi - 1970 Addendum No. 2 to Volume V Please find attached Addendum No. 2 to Volume V, in English. Union Internationale des telecommunications 1211 GENEVE 20 Suiate - Switzerland - Suiza July, 1973 ADDENDUM No. 2 to VOLUME V Xllth PLENARY ASSEMBLY OF THE C.C.I.R. New Delhi, 1970 Note by the Director, C.C.I.R. Subsequent to the publication of Addendum No. 1 to Volume V (Broadcasting service (sound and television), Transmission of sound broadcasting and television signals over long distances) of the documents of the Xllth Plenary Assembly of the C.C.I.R., new texts relating to the transmission of sound broadcasting and television signals over long distances have been submitted for adoption by correspondence, in conformity with the provisions of No. 190 of the International Telecommunication Convention, Montreux, 1965. These have received more than the twenty approvals necessary for their adoption by the Members of the I.T.U. and have therefore become official Questions of the C.C.I.R. These texts, which should be included in Part 2, are: — Question lOjCMTT, which is reproduced on a separate sheet numbered 317-1 a. — Question lljCMTT, which is reproduced on a separate sheet numbered 318. Advantage has been taken of the issue of this Addendum to notify the following correction to Volume V: Part 1 Page 226, § 6.2, last line: Replace “(40 ± 10)%” by “36% to 44%”. — 166 a — QUESTION 25/11* STANDARDS FOR TELEVISION SYSTEMS USING DIGITAL MODULATION (1972) The C.C.I.R., CONSIDERING (a) that the C.C.I.T.T. are studying the transmission standards to be used on future digitally coded television systems; (b) that, in view of the development of digital methods of processing, transmitting and record­ ing signals, it is possible that these techniques will be widely used in television; (c) that, to facilitate international exchanges of programmes and to rationalize the design of equipment, it would be desirable to standardize as far as possible the methods used for the digital coding of television signals; ' (d) that digital signal processing, if used in television studios, could lead to improved reliability and performance; decides that the following question should be studied: 1. what methods should be used for the digital coding of picture signals and the associated sound signals, and what would be the resulting advantages: — inside the studio complex, including the recording of television signals; — in the transmission of television signals on terrestrial channels Using digital modulation; — in the transmission of television signals on satellite channels; — in direct broadcasting from satellites; 2. is there a single method of digital coding which would be suitable for all the uses described in § 1; 3. what digital standards should be recommended for the applications mentioned in § 1; 4. what is the simplest and most effective technique for monitoring digitally coded television and associated sound signals? * This Question is identical with Question 10/CMTT. Addendum No. 2 to Volume V, part 2, Xllth P.A. of the C.C.I.R., New Delhi, 1970 - 3 1 7 - l a — QUESTION 10/CMTT STANDARDS FOR TELEVISION SYSTEMS USING DIGITAL MODULATION (1972) ' The C.C.I.R., CONSIDERING (a) that the C.C.I.T.T. are studying the transmission standards to be used on future digitally coded television systems; (b) that, in view of the development of digital methods of processing, transmitting and record­ ing signals, it is possible that these techniques will be widely used in television; (c) that, to facilitate international exchanges of programmes and to rationalize the design of equipment, it would be desirable to standardize as far as possible the methods used for the digital coding of television signals; (d) that digital signal processing, if used in television studios, could lead to improved reliability and performance; decides that the following question should be studied: 1. what methods should be used for the digital coding of picture signals and the associated sound signals, and what'would be the resulting advantages : — inside the studio complex, including the recording of television signals; — in the transmission of television signals on terrestrial channels using digital modulation; — in the transmission of television signals on satellite channels; — in direct broadcasting from satellites; 2. is there a single method of digital coding which would be suitable for all the uses described in § 1; 3. what digital standards should be recommended for the applications mentioned in § 1; 4. what is the simplest and most effective technique for monitoring digitally coded television and associated sound signals? Note by the Secretariat. — During the final meetings of Study Groups 10, 11 and the CMTT (Geneva, 1974), it would be highly desirable to modify the text of this Question so that Study Programme 10A/CMTT could be considered as being entirely derived from it (both as regards that part concerning television and that part concerning sound broadcasting). Addendum No. 2 to Volume V, part 2, Xllth P.A. of the C.C.I.R., New Delhi, 1970 — 318 — QUESTION 11/CMTT PERFORMANCE CHARACTERISTICS OF 5 kHz-TYPE SOUND PROGRAMME CIRCUITS (1972) The C.C.I.R., CONSIDERING (a) that, according to Opinion 41, the CMTT should study circuits with “a narrow bandwidth of about 100 Hz-5 kHz” (nominal bandwidth); (b) that new C.C.I.T.T. Recommendations J.23 and J.24 (provisional reference: C.C.I.T.T. White Book, Mar del Plata, 1968, Volume III, Recommendations J.31 and J.41 for normal sound programme circuits, type B, and for old-type sound programme circuits respectively) can only be applied to a limited degree to the circuits mentioned under (a) and thus should be replaced by an up-to-date comprehensive recommendation; decides that the following question should be studied: what should be the performance characteristics of a new type of sound programme circuit (designated by convention as “5 kHz-type sound programme circuit”) including the follow­ ing points: 1. definition of the hypothetical reference circuit; 2. nominal bandwidth and frequency band effectively transmitted; 3. permissible attenuation distortion; 4. permissible phase distortion; 5. permissible weighted and unweighted noise (with the definition of an appropriate weighting network); 6. permissible intelligible crosstalk; 7. permissible variation in relative level with time; 8. permissible non-linearity distortion; 9. permissible error on frequency reconstitution, etc.? Note 1. — Study Programme 5-1D-1/CMTT could be extended to include the effect of band­ width restriction. Note 2. — There may be two categories of use for such circuits, one for commentary purposes and the other also including transmission of music. If it seems advisable to recommend different characteristics for these two cases, this should be stated. Note 3. — Such circuits may be set up on carrier analogue systems and also on PCM systems; in the latter case, the permissible quantizing distortion should be stated. Note 4. — The CMTT should consider whether recommendations on intermodulation distortion should be given in addition to those on harmonic distortions. If so, how should the inter­ modulation distortion be measured? Addendum No. 2 to Volume V, part 2, XHth P.A. of the C.CJ.R., New Delhi, 1970 COVERING NOTE GENERAL SECRETARIAT INTERNATIONAL TELECOMMUNICATION UNION e . QENfevE, 16 July 1973 Subject: Documents of the p l a c e o e s n a t i o n s Xllth Plenary Assembly of the C.C.I.R. New Delhi - 1970 Addendum No. 1 to Yolume V Please find attached Addendum No. 1 to Yolume V, in English. Union Internationale do# telecommunications 1211 GENEVE 20 Suisse - Switzerland • Suiz* June, 1973 ADDENDUM No. 1 to VOLUME V Xllth PLENARY ASSEMBLY OF THE C.C.I.R. New Delhi, 1970 Note by the Director, C.C.I.R. Subsequent to the publication of Volume V (Broadcasting service (sound and television), Transmission of sound broadcasting and television signals over long distances) of the documents of the Xllth Plenary Assembly of the C.C.I.R., new texts relating to these fields have been sub­ mitted for adoption by correspondence, in conformity with the provisions of No. 190 of the International Telecommunication Convention, Montreux, 1965. These have received more than the twenty approvals necessary for their adoption by the Members of the I.T.U. and have therefore become official Study Programmes of the C.C.I.R.