1、STD-SMPTE RP 83-ENGL L77b W 8357403 0002bb3 T2b W RP 83-1996 SMPTE RECOMMENDED PRACTICE Revision of RP 83-1992 Specifications of Tracking-Control Record for 1 -in Type B Helical-Scan Television Analog Recording 1 Scope This practice specifies the recorded relationships among the tracking control sig
2、nal, the edit pulse signal, and the video signal for 1 -in type B helical-scan video tape recordings. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated we
3、re valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility Page 1 of 2 pages of applying the most recent edition of the standards indicated below: ANSI/SMPTE 16M-1992, Television Analog Recording - 1 -in Type B Heli
4、cal Scan - Records EIA Industrial Electronics Tentative Standard No. 1, Color Television Studio Picture Line Amplifier Output Drawing ITU-R BT.470-4, Television Systems 3 Dimensions 3.1 The recorded relationchips among the track- ing control signal, the edit pulse signal, and the video signal shall
5、be as specified in figure 1. CONTROL TRACK CRRENT 09 1 Figure 1 - Position and waveform of control track and edit pulse 525 line-60 field systems (NTSC) Copyright Q 1996 by the SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (91 4) 761 -1 1 O0 Approve
6、d November 18,1996 STD-SMPTE RP 83-ENGL 1976 8357401 0002bb4 9b2 RP 83-1 996 3.2 The position of the field synchronizing signal on the video tracks shall be as specified in ANSVSMPTE i 6M. 3.5 The amplitude of the control signal current flowing through the recording head shall be such that the tape
7、is driven to the verge of saturation. 3.7 The edit and control pulses shall be 130 ps +_ 10 ps in width. 3.8 The rise time of the signal shall be no longer than 10 ps. 3.4 The polarity of the tracking pulses shall be as follows: If the tracking pulses on the tape are regarded as discrete magnets, the leading part of the pulses constitute a magnet whose south- seeking pole points in the direction of tape motion. Annex A (informative) Bibliography ANSIISMPTE 15M-1992, Television Analog Recording - 1 -in Type B Helical Scan - Basic System Parameters Page 2 of 2 pages
