1、 SMPTE 30M 9.5 8357401 0001887 334 SMPTE STANDARD ANSI/SMPTE 3OM-1995 Revision of ANSWSMPTE 30M-1989 for Television Analog Recording - 1 -in Type B Reference Recorders Records on Reference Tapes 1 Scope This standard specifies the dimensions and location of video, audio, and tracking-control records
2、 on refer- ence tapes for 1 -in type B helical-scan video tape recorders, operating on the 525/60 monochrome or NTSC color system, as described in ANWSMPTE 29M. 2 General specifications 2.1 Tests and measurements made on the tape record to check the requirements of this standard shall be made under
3、the following conditions unless otherwise specified: Temperature 23C 2 1C Relative humidity (50 2 2)% Barometric pressure Tape tension 86 kPa to 106 kPa (860 mbar to 1060 mbar) 2.0 N I 0.1 N 2.2 Before recording and testing, the tape shall be conditioned for 24 hours, and wound on a reel at 2.0 N f
4、0.5 N. 2.3 The reference edge of the tape for dimen- sions in this standard shall be the lower edge as shown in figure 1. The magnetic coating is on the side facing the observer. 2.4 The tape speed shall be 245.0 mm/s I 0.8 mm/s. Page 1 of 3 pages 3 Record locatioin and dimensions 3.1 Record locatio
5、n and dimensions shall be in accordance with figure 1 and table 1. 3.2 The nominal width of audio records 1, 2, and 3 shall be 0.8 mm. 3.3 The audio and cue recordings shall be down- stream from the associated video information (see dimension J in figure 1 and table 1). 3.4 The audio recording shall
6、 be made so that the azimuth of the recorded record is at an angle of 90“ 2 2.5 to the reference edge of the tape. Audio 1 and 2 head gaps shall be in line. 3.5 The position of the field synchronizing signal on the video record shall be 7.609 mm 2 0.024 mm from the intersection of Lt and X, in the d
7、irection of tape travel as measured along the video track. 3.6 The cue signal and time code shall be recorded in the audio 3 track. 4 Video record curvature The edge of the video irecord shall be contained within two parallel straight liries 0.01 5 mm apart. CAUTION NOTICE This Standard may be revis
8、ed or withdrawn at any time. The procedures of the Standard Developer require that action be taken lo reaffirm. revise, or withdraw this standard no later than live years from the date of publication Purchasers of standards may receive current information on all standards by calling or writing the S
9、tandard Developer. Printed in USA Copyright O 1995 by THE SOCIETY OF - American National Slandard MOTION PICTURE AND TELEVISION ENGINEERS 595 W Hartsdale Ave, White Plains. NY 10607 (914) 761-1100 Approved March 15. 1995 SIPTE 301 95 8357401 0001888 270 ANSIEMPTE 301-1995 Y ? k- a Page 2 of 3 pages
10、SMPTE 30M 95 8357401 0001889 107 ANSUSMPTE 30M-1995 Table 1 - Specifications Dimensions Millimeters Miriimum Maximum Ab At Bb Bt cb Ct Fb Ft G J Kb Kt Lb Lt N O P Qe QS S ao ai Control track bottom edge Control track top edge Audio 1 track bottom edge Audio 1 track top edge Audio 2 track bottom edge
11、 Audio 2 track top edge Audio 3 track bottom edge Audio 3 track top edge Center of video tape Position of audio heads Full video width bottom edge Full video width top edge Video width (1 80“) bottom edge Video width (180“) top edge Video track pitch Video track width Position of control track head
12、Switch point distance video 2 track Switch point distance video 1 track Distance between control track head gap and center edit pulse at 180“ switch point Scanning angle (helix angle) Video track angle (525460) 23.54 23.94 24.34 25.14 22.34 23.14 0.16 0.96 12.70 ref 23S1.2 1.18 22. 19 1.82 ref 21.55
13、 ref 0.200 ref C.156 2 .845 8ii.096 E .523 0.040 ref 1f434“ t 10“ I f288“ 23.64 24.04 24.44 25.24 22.44 23.24 0.24 1 .O4 232.8 1.18 22.19 0.164 2.875 82.121 5.533 Annex A (informative) Bibliography ANSVSMPTE 29M-1995, Television Analog Recording - 1-in Type B Reference Recorders - Basic System and Transport Geometry Page 3 of 3 pages
