1、 Rec. ITU-R BT.470-7 1 RECOMMENDATION ITU-R BT.470-7 Conventional analogue television systems (1970-1974-1986-1994-1995-1997-1998-2005) The ITU Radiocommunication Assembly, considering a) that many countries have established satisfactory colour television broadcasting services based on NTSC, PAL or
2、SECAM systems; b) that it would add further complications to the interchange of programmes to have a greater multiplicity of systems, recommends 1 that administrations wishing to implement an analogue composite colour television system should choose the radio-frequency specifications of one of the t
3、elevision systems defined in Recommendation ITU-R BT.1701 Characteristics of radiated signals of analogue television systems; and 2 that administrations should choose the corresponding production video signal characteristics defined in Recommendation ITU-R BT.1700 Characteristics of composite video signals for conventional analogue television systems.
