IEC 62356-1-2003 pdf – Video recording – 12,65 mm TYPE D-11 format – Part 1: Tape recording

IEC 62356-1-2003 pdf – Video recording – 12,65 mm TYPE D-11 format – Part 1: Tape recording.
1 Scope This International Standard specifies the format for the recording of Type D-11 compressed pictures, four channels of AES3 data and associated data which form helical records on 12,65 mm tape in cassettes. This standard also defines the helical track record parameters, the content and format of the longitudinal records and the cassette physical specifications. The recording format supports frame frequencies of 30/1,001 Hz, 25 Hz, 24 Hz and 24/1,001 Hz. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61213:1993, Analogue audio recording on video tape – Polarity of magnetization IEC 61237-1:1994, Broadcast video tape recorders – Methods of measurement – Part 1: Mechanical measurements IEC 62356-2, Video recording – 12,65 mm type D-11 format – Part 2: Picture compression and data stream 1 IEC 62356-3, Video recording – 12,65 mm type D-11 format – Part 3: Data mapping over SDTI 1 ITU-R Recommendation BT.709:2004, Parameter values for the HDTV* standard for production and international program exchange SMPTE 12M:1999, Television – Audio and Film – Time and Control Code SMPTE 292M:1998, Bit-Serial Digital Interface for High-Definition Television Systems SMPTE 276M:1995, Transmission of AES-EBU Digital Audio Signals Over Coaxial Cable AES3-1992,Serial transmission format for two-channel linearly represented digital audio data
5.2.3 Datum planes Datum plane Z shall be determined by three datum areas, A, B and C, as shown in Figures 3a and 16a. Datum plane X shall be orthogonal to datum plane Z and shall include the centres of datum holes (a) and (b). Datum plane Y shall be orthogonal to both datum plane X and datum plane Z and shall include the centre of datum hole (a) as shown in Figures 2 and 15. 5.2.4 Tape winding The magnetic coating side of the magnetic tape shall face outside on both the supply reel and the take-up reel as shown in Figures 4 and 17. 5.2.5 Label area and window area The hatched areas shown in Figures 1 and 14 are for the label and window. Labels attached to the cassette shall not protrude above the outside cassette surface plane. 5.2.6 Guiding groove For correct insertion into the VTR, four guiding grooves for S cassettes, as shown in Figures 1 and 2, and three guiding grooves for L cassettes, as shown in Figure 15, shall be provided.5.2.3 Datum planes Datum plane Z shall be determined by three datum areas, A, B and C, as shown in Figures 3a and 16a. Datum plane X shall be orthogonal to datum plane Z and shall include the centres of datum holes (a) and (b). Datum plane Y shall be orthogonal to both datum plane X and datum plane Z and shall include the centre of datum hole (a) as shown in Figures 2 and 15. 5.2.4 Tape winding The magnetic coating side of the magnetic tape shall face outside on both the supply reel and the take-up reel as shown in Figures 4 and 17. 5.2.5 Label area and window area The hatched areas shown in Figures 1 and 14 are for the label and window. Labels attached to the cassette shall not protrude above the outside cassette surface plane. 5.2.6 Guiding groove For correct insertion into the VTR, four guiding grooves for S cassettes, as shown in Figures 1 and 2, and three guiding grooves for L cassettes, as shown in Figure 15, shall be provided.
5.2.7 Safety tab and safety plug for recording inhibition For S cassettes, a safety plug at the supply reel side and a hole of minimum depth 10 mm from datum plane Z at the take-up reel side shall be provided as shown in Figure 2. For L cassettes, a safety plug shall be provided at the take-up reel side as shown in Figure 15. The safety plug shall not be deformed by 0,3 mm or more when a force of 2,0 N (204 gf) is applied to the centre of it, using a 2,5 mm diameter rod. See Figures 12 and 25. 5.2.8 Identification holes Six identification holes (holes 1 to 6) shall be located as specified in Figures 2 and 15. For this format, holes 1, 2, 3, 4 and 6 shall be closed. Hole 5 shall be open. 5.2.9 Reels 5.2.9.1 Reel lock system The reels shall be automatically unlocked when the cassette is inserted into the video tape recorder and/or player unit and automatically locked when the cassette is ejected from it. The locations of the reels when in the unlocked position are shown in Figures 4 and 17. Dimensions of the reels are shown in Figures 6 and 19. Heights of the reels are shown in Figures 7 and 20. The reel shall be completely released when the cassette lid is opened 23,5 mm minimum from datum plane Z. 5.2.9.2 Reel spring force The reels assembled in the cassette shall be pressed by the reel spring with a specified force under the conditions specified in Figures 11 and 24. The spring force shall be 1,5 N ± 0,5 N (153 gf ± 51 gf) for S cassettes and 3,5 N ± 0,5 N (357 gf ± 51 gf) for L cassettes when pressing on a reel 2,4 mm above datum plane Z as shown in Figures 11 and 24. 5.2.9.3 Extraction force The force (F1, F2) required to pull the tape out from the reel shall not exceed 0,17 N (17 gf), as specified in Figures 13a and 26a. 5.2.9.4 Friction torque The torque required to wind the tape shall be less than 15 mN m (152 gf cm) for S cassettes and less than 30 mN m (305 gf cm) for L cassettes, as specified in Figures 13b and 26b.