1、SMPTE 29M 95 8357401 0003885 563 SMPTE STANDARD AIYSI/SMPTE 29M-1995 Aevisisn of ANSI/SMPTE 29M-1989 for Television Analog Recording - 1 -in Type B Reference Recorders - Basic System and Transport Geomletry Page 1 of 2 pages 1 Scope 4 Video record system This standard specifies test conditions, gene
2、ral video record system, video pole-tip locations, scanner parameters, scanner-guide locations, and the tape tension for 1-in type B helical-scan video tape reference recorders operating on the 525/60 monochrome or NTSC color systems. 4.1 The video modulation system shall be the FM type. 4.2 The vid
3、eo record shall contain all picture lines and vertical sync information. 5 Video heads aind scanner parameters 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the edition indic
4、ated was valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below: SMPTE RP 84-1 992, Reference Carrier Frequencies and Preemphasis Characteristics
5、for 1-in Type B Helical-Scan Television Analog Recording 3 General specifications Tests and measurements made on the recorder to check the requirements of this standard shall be made under the following atmospheric conditions: Temperature of drum Temperature for all Relative humidity (50 I 2)% Barom
6、etric pressure ConditiQning before testing 24 h diameter 23C r 0.5% other tests 23C 2 1C 86 kPa to 106 kPa (860 mbarto 1060 mbar) 5.1 Two video heads shall be positioned 180“ ir 20“ apart, , measured from the gap of video head 1 to the gap of video head 2, as shown in figure 1. 5.2 The drum size :;h
7、all be 50.330 mm + O mm - 0.003 mm. 5.3 The nominal rotational speed of the head wheel shall be 150 r/s. 5.4 The video head protrusion shall be 0.030 mm r 0.005 mm, measured from the outer surface of the drum to the end of the head tip. 5.5 The video head gap shall be 90“ nominal to the plane of rot
8、ation of the video head. 5.6 The control head gap shall be located at point Y (see figure 1) which lies on a line which is at 90“ f 7.5, measured from diameter F-G which is the (centerline through the plate assembly. 6 Tape tension The record tape tension shall be as follows: CAUTION NOTICE This Sta
9、ndard may be revised or withdrawn at any time. The procedures of the Standard Developer require that action be taken to reaffirm, revise. or withdraw this standard no later than five years from the date of publication. Purchasers of standards may receive Cririent information on all standards by call
10、ing or writina the Standard Developer. Printed in USA Copyright Q 1995 by THE SOCIRY OF L American National Standard MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 Approved March 15, 1995 SMPTE 29M 95 8357403 0001886 UT8 ANSVSMPTE 29M-1995 Tin, t
11、ape tension in measured between 7 Characteristic frequencies Tout, maximum tape measured between B and X = 2.0 N * 0.1 N Characteristic frequencies shall be in accordance with table 1 in SMPTE RP 84, except that the tolerances shall be tightened to I 0.025 MHz. Other values shall be held as closely
12、as possible. tension out Y and E = 2.3 N * 0.1 N DIRECIION OF HEAD WHEEI ROTATION HEAD DIRECTION OF VIDEO HEAD 1 TAPE MOTION Figure 1 - Video heads and control head gap Annex A (informative) Bibi iography ANSI/SMPTE 26M-1995, Video Recording - 1 -in Helical- Scan Recorders - Raw Stock for Reference
13、Tapes ANSVSMPTE 30M-1995, Television Analog Recording - 1-in Type 6 Reference Recorders - Records on Reference Tapes SMPTE RP 83-1992, Specifications of Tracking Control Record for 1-in Type B Helical-Scan Television Analog Aecordlng SMPTE RP 107-1988, Video and Audio Reference Tape for 1 -in Type B Helical-Scan Format Page 2 o 2 pager
