INTERNATIONAL TELECOMMUNICATION UNION RADIOCOMMUNICATION BUREAU (Direct Fax No. +41 22 730 57 85) Administrative Circular CAR/11 25 April 1994 TO THE ADMINISTRATIONS OF MEMBERS OF THE ITU Proposed approval of 28 draft new and revised Recommendations adopted by Radiocommunication Study Group 11 at its meeting from 28 February to 4 March 1994 At the meeting of Radiocommunication Study Group 11 (Broadcasting services - television), held from 28 February to 4 March 1994, the Study Group unanimously adopted the texts of 28 draft new and revised Recommendations, and agreed to apply the procedure of Resolution ITU-R 1 (see § 10) for approval of Recommendations between Radiocommunication Assemblies. The titles of these Recommendations are given in the Annex. Draft new and revised Recommendations, adopted in the joint meeting of Study Groups 10 and 11 on 3 March 1994 are included in Administrative Circular CAR/12. Having regard to the provisions of § 10.4.1 of Resolution ITU- R 1, I should be grateful if you would inform me by 25 July 1994, whether your Administration approves or does not approve these draft Recommendations. A Member who indicates that a draft Recommendation should not be approved is requested to advise the reason and indicate possible changes in order to facilitate further consideration by the Study Group during the study period. After the above-mentioned deadline, the Director of the Radiocommunication Bureau will notify the results of this consultation by administrative circular and make arrangements for the Recommendations to be published in accordance with Resolution ITU-R 1. Richard C. KIRBY Director Annex: List of documents with titles and summaries Documents attached: Documents 11/BL/55 to 11/BL/82 Distribution: Administrations of Members of the ITU ***** ANNEX List of titles and summaries of the 28 draft new and revised Recommendations adopted by Radiocommunication Study Group 11 (Geneva, 28 February to 4 March 1994) 1) Draft new Recommendations Draft new Recommendation ITU-R BT.[Doc. 11/141] 11/BL/55 HARMONIZATION OF DIGITAL METHODS FOR DELIVERY SYSTEMS FOR TELEVISION SERVICES TO THE HOME This Recommendation includes a set of guidelines to be followed in the harmonized development of Recommendations and standards related to digital methods of delivery for television and image service to the house. These concepts include common processing algorithms, hierarchical coding, flexible multiplexing and inclusion of headers/descriptors in the data stream. Draft new Recommendation ITU-R BT.[Doc. 11/143] 11/BL/56 USE OF BIT-RATE REDUCTION IN THE HDTV STUDIO ENVIRONMENT This Recommendation specifies that any process of bit-rate reduction at studio level should provide virtually transparent (quasi loss-less) coding. This should allow for multiple cascading of codecs even in the case of digital recording. Furthermore, the bit-rate reduction algorithms should not produce perceptible artefacts when cascaded with algorithms used in contribution and distribution circuits. Draft new Recommendation ITU-R BT.[Doc. 11/160] 11/BL/59 DIGITAL INTERFACES FOR 1125/60/2:1 AND 1250/50/2:1 HDTV STUDIO SIGNALS This Recommendation specifies the basic digital coding and bit- parallel interface standards for the 1125/60/2:1 and 1250/50/2:1 HDTV studio signals. It applies to the HDTV studio signals described in Recommendation ITU-R BT.709. Draft new Recommendation ITU-R BT.[Doc. 11/162] 11/BL/60 DATA TRANSMISSION PROTOCOLS AND TRANSMISSION CONTROL SCHEME FOR DATA BROADCASTING SYSTEMS USING A DATA CHANNEL IN SATELLITE TELEVISION BROADCASTING This Recommendation specifies the data transmission protocols of layer 1 to layer 4 for data broadcasting systems such as the digital subcarrier NTSC and MUSE in satellite television broadcasting. The annexes to this Recommendation specify the data transmission protocols, the transmission control scheme and the conditional access system. Draft new Recommendation ITU-R BT.[Doc. 11/174] 11/BL/62 BASIC OBJECTIVES FOR THE PLANNING AND IMPLEMENTATION OF DIGTIAL TERRESTRIAL TELEVISION BROADCASTING SYSTEMS This Recommendation specifies that digital terrestrial television broadcasting systems should be able to support a range of picture quality services including HDTV in a compatible upgrading structure. The resulting scalable system should optionally support multi-programme and single frequency network operation. Draft new Recommendation ITU-R BT.[Doc. 11/176] 11/BL/63 PLANNING METHODS FOR 625-LINE TERRESTRIAL TELEVISION IN VHF/UHF BANDS This Recommendation is intended to give a comprehensive approach to 625-line terrestrial television planning. It is based on existing Reports 1085-1 and 1086-1. Annex 1 gives the planning methods whilst Annex 2 includes frequency planning constraints. The resulting Recommendation is complemented by Recommendation 655 on protection ratios. Draft new Recommendation ITU-R BT.[Doc. 11/177] 11/BL/64 REFERENCE SIGNALS FOR GHOST CANCELLING IN TELEVISION This Recommendation specifies the main objectives of a ghost cancelling reference signal intended to equalize multiple and long or short delayed ghost images. The Recommendation includes also in Annex 1, three GCR system specifications applicable to NTSC systems, whilst Annex 2 gives the specifications of GCR systems applicable to the MAC family and to the MUSE system. Draft new Recommendation ITU-R BT.[Doc. 11/182] 11/BL/67 SUBJECTIVE ASSESSMENT OF DIGITAL TELEVISION SYSTEMS AT OR NEAR THE QUALITY OF CONVENTIONAL SYSTEMS This Recommendation is aimed to complement Recommendation ITU- R BT.500 in the case of digital systems offering a quality comparable to that of conventional systems. Annex 1 to this Recommendation includes specific procedures applicable to digital systems that include viewing conditions, assessment methods, etc. Draft new Recommendation ITU-R BT.[Doc. 11/189] 11/BL/74 SUBJECTIVE ASSESSMENT OF CONVENTIONAL TELEVISION SYSTEMS This Recommendation is aimed to complement Recommendation ITU- R BT.500 in the case of conventional television systems. Annex 1 to this document includes the specific viewing conditions and the subjective assessment methods to determine the overall quality and the failure characteristics of conventional systems. Draft new Recommendation ITU-R BT.[Doc. 11/190] 11/BL/75 USER REQUIREMENTS FOR THE TRANSMISSION THROUGH CONTRIBUTION AND PRIMARY DISTRIBUTION NETWORK OF DIGITAL HDTV SIGNALS This Recommendation specifies the user requirements that should govern the specification design and testing of systems for the transmission of Y, CB, CR based HDTV signals through contribution and primary distribution network. Functional and performance requirements are included for contribution codecs, whilst functional requirements have been set for primary distribution codecs. Draft new Recommendation ITU-R BT.[Doc. 11/192] 11/BL/76 USER REQUIREMENTS FOR EMISSION AND SECONDARY DISTRIBUTION SYSTEMS FOR SDTV, HDTV AND HIERARCHICAL CODING SCHEMES This Recommendation specifies the user requirements for secondary distribution and emission. Table 1 gives the specifications for functional requirements (such as input TV signal format, input audio signal format etc.), performance requirements applicable to a complete broadcast chain (such as codecs in cascade, basic quality reception conditions, audio and video recovery time, etc.) and design requirements. Draft new Recommendation ITU-R BT.[Doc. 11/197] 11/BL/78 STUDIO FORMAT PARAMETERS FOR ENHANCED 16:9 625-LINE TELEVISION SYSTEMS (D- AND D2-MAC, PALplus, ENHANCED SECAM) This new Recommendation recommends that programme producers for enhanced television service should adopt component standards using the techniques specified in the annex. These techniques include video signal format, adjustments to conventional production equipment, down-conversion from HDTV sources and improved film production methods. Draft new Recommendation ITU-R BT.[Doc. 11/198] 11/BL/79 WIDESCREEN SIGNALLING FOR BROADCASTING (SIGNALLING FOR WIDESCREEN AND OTHER ENHANCED TELEVISION PARAMETERS) This Recommendation recommends to broadcasters wishing to implement the automatic recognition of the transmitted aspect ratio the system given in Annex 1 for 625-line TV (PAL and SECAM). The widescreen signalling information contains information on the aspect ratio range of the transmitted signal and its position, on the position of the subtitles and on the camera/film mode. Furthermore, some bits are reserved for future EDTV signalling (e.g. PALplus) as well as for future use. Draft new Recommendation ITU-R BT.[Doc. 11/199] 11/BL/80 RELATIVE QUALITY REQUIREMENTS OF TELEVISION BROADCAST SYSTEMS This Recommendation establishes that the quality requirements applicable to high-definition, enhanced definition, conventional definition and limited definition should be specified by a quality- space representation associated with design viewing distances and included in the annex. Draft new Recommendation ITU-R BT.[Doc. 11/201] 11/BL/81 ENHANCED COMPATIBLE WIDESCREEN TELEVISION BASED ON CONVENTIONAL TELEVISION SYSTEMS This Recommendation specifies in a modular approach the enhancements and features to be applied to existing television systems, such as picture enhancement techniques, sound enhancement methods, etc. The Recommendation also specifies that the display format should be 16:9 with letter-box presentation on 4:3 receivers and that the enhancements should not result in increased nominal TV channel bandwidth and protection ratios. 2) Draft revised Recommendations Draft Revision of Recommendation ITU-R BT.500-5 [Doc. 11/181] 11/BL/66 METHODOLOGY FOR THE SUBJECTIVE ASSESSMENT OF THE QUALITY OF TELEVISION PICTURES The revision of this Recommendation is aimed to present in a structured manner the methodology to be followed in the subjective assessment of the quality of television pictures. Annex 1 describes the recommended assessment methods including the source signals, test materials, panel of observers, the double-stimulus impairment scale method and its application and the double-stimulus continuous quality-scale method and its application. The analysis and presentation of results are found in Annex 2. Draft Revision of Recommendation ITU-R BT.601-3 [Doc. 11/187] 11/BL/72 ENCODING PARAMETERS OF DIGITAL TELEVISION FOR STUDIOS The revision to this Recommendation consists of the updating of its annex (Definition of signals used in the digital coding standards). Corrections have been introduced in the formula for the construction of the colour difference signals and a new Fig. 3 gives the line numbers in the digital picture (frame). Draft Revision of Recommendation ITU-R BT.655-2 [Doc. 11/179] 11/BL/65 RADIO-FREQUENCY PROTECTION RATIOS FOR AM VESTIGIAL SIDEBAND TERRESTRIAL TELEVISION SYSTEMS The revision to this Recommendation is aimed to present in a more efficient form the protection ratio values applicable to terrestrial television systems. The resulting text is of easier consultation and includes new information in specific cases such as sysnchronized carrier operation, image-channel interference, etc. Draft Revision of Recommendation ITU-R BT.656-1 [Doc. 11/158] 11/BL/57 INTERFACES FOR DIGITAL COMPONENT VIDEO SIGNALS IN 525-LINE AND 625-LINE TELEVISION SYSTEMS OPERATING AT THE 4:2:2 LEVEL OF RECOMMENDATION ITU-R BT.601 The revision of this Recommendation includes an update of the specifications of some parameters like output and terminating impedance, receiver sensitivity etc. and further improvements to the text of Annex 1. Draft Revision of Recommendation ITU-R BT.710-1 [Doc. 11/194] 11/BL/77 SUBJECTIVE ASSESSMENT METHODS FOR IMAGE QUALITY IN HIGH-DEFINITION TELEVISION The revision to this Recommendation includes changes in the main text consequential to the revision of Recommendation ITU-R BT.500. A new Annex 4 has been added which gives detailed information about test pictures and sequences recommended to assess high-definition television. Draft Revision of Recommendation ITU-R BT.797 [Doc. 11/202] 11/BL/82 PARAMETERS FOR 4:3 ENHANCED TELEVISION SYSTEMS THAT ARE NTSC-COMPATIBLE This Recommendation specifies the parameters for an enhanced 4:3 NTSC system in Japan. Annex 1 to this document includes a number of enhancements to be implemented at the studio side (such as higher resolution signal sources, pre-compensation of chrominance signals and adaptive emphasis of the luminance signals), at the emission side (insertion of ghost cancelling reference signal) and at the receiver side (progressive scanning display, three-dimensional luminance/chrominance filter and ghost cancelling circuit). Draft Revision of Recommendation ITU-R BT.798 [Doc. 11/173] 11/BL/61 DIGITAL TERRESTRIAL TELEVISION BROADCASTING IN THE VHF/UHF BANDS The revision to this Recommendation consists of removing its annex where information of current developments in digital terrestrial broadcasting is given. The text of this annex, due to its frequent update, is now found attached to the Chairman's report. Draft Revision of Recommendation ITU-R BT.799 [Doc. 11/159] 11/BL/58 INTERFACES FOR DIGITAL COMPONENT VIDEO SIGNALS IN 525-LINE AND 625-LINE TELEVISION SYSTEMS OPERATING AT THE 4:4:4 LEVEL OF RECOMMENDATION ITU-R BT.601 The revision of this Recommendation is on the same line as that of Recommendation ITU-R BT.656. It updates some parameter specifications. Draft Revision of Recommendation ITU-R BT.800 [Doc. 11/185] 11/BL/70 USER REQUIREMENTS FOR THE TRANSMISSION THROUGH CONTRIBUTION AND PRIMARY DISTRIBUTION NETWORKS OF DIGITAL TELEVISION SIGNALS DEFINED ACCORDING TO THE 4:2:2 STANDARD OF RECOMMENDATION ITU-R BT.601 Minor amendments have been introduced in this revision to draw attention to some peculiarity of the "Diva with noise" test material. Draft Revision of Recommendation ITU-R BT.802 [Doc. 11/183] 11/BL/68 TEST PICTURES AND SEQUENCES FOR SUBJECTIVE ASSESSMENTS OF DIGITAL CODECS CONVEYING SIGNALS PRODUCED ACCORDING TO RECOMMENDATION ITU-R BT.601 This Recommendation in its annex specifies the still pictures and moving sequences contained in a library tape, that should be used when applying Recommendation ITU-R BT.800 and evaluating the codecs conveying signals originated according to Recommendation ITU- R BT.601. Annex 2 gives a possible arrangement for assembling a subjective test tape. Draft Revision of Recommendation ITU-R BT.811 [Doc. 11/184] 11/BL/69 THE SUBJECTIVE ASSESSMENT OF ENHANCED PAL AND SECAM SYSTEMS The revision to this Recommendation includes a new table specifying the viewing conditions for the subjective assessment (i.e. ratio of viewing distance to picture height, peak luminance of the display, viewing angle and display size). A new annex gives guidelines for the subjective test session arrangements. Draft Revision of Recommendation ITU-R BT.814 [Doc. 11/186] 11/BL/71 SPECIFICATIONS AND ALIGNMENT PROCEDURES FOR SETTING OF BRIGHTNESS AND CONTRAST OF DISPLAYS The revision to this Recommendation mainly consists of the update of its Fig. 1 (PLUGE active field and waveform) and of Table 1 (level of waveform). Two additional levels have in fact been introduced for subjective assessment monitoring. Draft Revision of Recommendation ITU-R BT.815 [Doc. 11/188] 11/BL/73 SPECIFICATION OF A SIGNAL FOR MEASUREMENT OF THE CONTRAST RATIO OF DISPLAYS An editorial amendment has been proposed for the grey level signal in Fig. 1.