1、EG 10-2003 Revision of SMPTE ENGINEERING GUIDELINE EG 10-1996 Tape Transport Geometry Parameters for 19-mm Type D-I Television Digital Component Recording Page 1 of 4 pages 1 Scope This guideline describes three feasible examples of mechanical designs and test conditions for achieving the record dim
2、ensions specified in SMPTE 224M. The parameters are for reference purposes only. 2 Definitions 2.1 scanner: A mechanical assembly containing a drum, rotating pole tips, and tape-guiding elements used to record and reproduce digital audio and video data. 2.2 drum: A cylindrical column around which th
3、e tape is at least partially wrapped in order to form a head-to-tape interface of a digital audio and video recording system. 2.3 helix angle: An angle formed between the path of the rotating pole tips and the tape reference edge-guiding system on the scanner of the helical-scan digital audio and vi
4、deo recording system. 2.4 track angle: An angle of the helical track record with respect to the reference edge of the tape. 2.5 effective wrap angle: An angle at the center of the drum subtended by the start and endpoint of the track. 2.6 total wrap angle: An angle at the center of the drum subtende
5、d by the lines of contact between the drum and the reference edge of the tape. 2.7 tape tension: Tape tension is defined by the tension after the entrance guide and before the exit guide scanner. 2.8 center span tension: A calculated value of the tape tension at a point midway between the tape entra
6、nce and exit guides of the scanner in the digital audio and video recording system. The users attention is called to the possibility that compliance with this standard may require use of an invention covered by patent rights. By publication of this standard, no position is taken with respect to the
7、validity of this claim or of any patent rights in connection therewith. The patent holder has, however, filed a statement of willingness to grant a license under these rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such a license. Details may be obta
8、ined from the publisher. No representation or warranty is made or implied that this is the only license that may be required to avoid infringement in the use of this standard. - COPYrighl Q ZOO3 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 w. Harisdale Ave., White Plains. NY 10607 (
9、914) 761-1100 Approved February 7,2003 EG 10-2003 Table 1 - Pole tip relationships for design I, II and 111 Parameters Design I Design II Design III Relevant figures Figure 1 Figure 2 Figure 3 Minimum number of pole tips 4 4 6 Angular relationship HI -H2: 7.4“ HI, H2, H3, and H4 HI -H2: 6.0“ H3-H4:
10、7.4“ equispaced H3- H4: 6.0“ H1 - H3: 180“ 90“ i .00833“ H5 - H6: 6.0“ H2 - H4: 180“ H1 - H3: 120.0“ H3 - H5: 120.0“ H5 - H1: 120.0“ Vertical displacement (mm) H1 - H2: 0.041 i 0.002 max H1 - H2: 0.0405 H3 - H4: 0.041 H3 - H4: 0.0405 H5 - H6: 0.0405 Maximum tip projection (Fm) 45 45 60 Table 2 - Sca
11、nner design parameters Parameters Design I Design II Design 111 Scanner rotation speed (r.p.s.) Number of tracks per rotation Drum diameter Upper (mm) Lower (mm) Tape tension Center span tension Helix angle Effective wrap angle Total wrap angle 150/1 .O01 150/1 .O01 100/1 .o01 4 4 6 75.020 i 0.005 7
12、5.000 f 0.005 96.444 75.000 i 0.005 75.000 i 0.005 96.400 0.6 i 0.005 NA 1.0 i 0.1 NA NA IN OUT (N) 0.8 i 0.2 5.4444“ i .0028“ 5.4441 O f .0002“ 5.4517“ 257.7“ 257.7“ 200.0“ 261 .O“ 261 .O“ 210.0“ I Scanner circumferential meed Irn/sed 35.3 35.3 30.3 I NA = Not available at this time. Annex A (infor
13、mative) Bibliography ANSVSMPTE 226M-1996, Television Digital Recording - 19-mm Tape Cassette ANSVSMPTE 227M-1996, Television Digital Component Recording - 19-mm Type D-1 - Helical Data and Control Records ANSVSMPTE 228M-1996, Television Digital Component Recording - 19-mm Type D-1 - Time and Control
14、 Code and Cue Records SMPTE 224M-2003, Television Digital Component Recording - 19-mm Type D-1 - Tape Record SMPTE 225M-2003, Television Digital Component Recording - 19-mm Type D-1 - Magnetic Tape SMPTE EG 21-1997, Nomenclature for Television Digital Recording of 19-mm Type D-1 Component and Type D-2 Composite Formats ITU-R BT.601-5 (1 0/05), Studio Encoding Parameters of Digital Television for Standard 4:3 and Widescreen 16:9 Aspect Ratios Page 4 of 4 pages
