SMPTE ST 19M-2003 Television Analog Recording - 1-in Type C - Records.pdf

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1、SMPTE STANDARD SMPTE 19M-2003 Revision of ANSVSMPTE 19M-1996 for Television Analog Recording - 1-in Type C - Records 1 Scope This standard specifies the dimensions and 1-in type C helical-scan television analog systems. 2 General specifications Page 1 of 5 pages location of recorded video, audio, an

2、d tracking-control records for recorders operating in the 525/60 monochrome or NTSC color 2.1 Tests and measurements made on the tape record to check the requirements of this standard shall be made under the following conditions unless otherwise specified: Temperature: 20C f 1C Relative humidity: (5

3、0 I 2)% Barometric pressure: Tape tension: 1.7N10.3N 86 kPa to 106 kPa 2.2 Conditioning before recording and testing shall be as follows: Environmental: Stabilized at measurement conditions Tape tension: Wound on a reel at 0.5 N to 3.0 N 2.3 The reference edge of the tape for dimensions in this stan

4、dard shall be the lower edge as shown in figure 1. The magnetic coating is on the side facing the observer in the figures. 3 Tapespeed The tape speed shall be 244.0 mm/s * 0.5 mm/s. 4 Record location and dimensions 4.1 Record location and dimensions shall be as specified in figure 1 and table 1 4.2

5、Dimensions P, Q, R, and are for reference purposes only. The parameters given in SMPTE 18M and the tape speed completely determine these values and their tolerances. The nominal values given are based on tensioned tape; therefore, direct measurement without tension must take into account tape elasti

6、city. 5 Video record curvature The edge of the video record shall be contained within two parallel straight lines 0.030 mm apart. Copyright Q 2003 by THE SOCIff OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Haitsdale Ave White Plains. NY 10607 Approved February 7,2003 (914)761-1100 SMPTE 19M-200

7、3 6 Relative positions of recorded signals 6.1 Video, sync, tracking-control, and audio signals with information intencdd to be time coincident shall be positioned as specified in figure 2 and table 1. Dimensions T, U, Y, and Z are for reference purposes only. 6.2 The start of the video record is th

8、at location on the video record which would be produced by scanner and guide locations with no electronic switching of the recording signal. 6.3 The vertical-interval dropout location with respect to a television frame is determined by the phase dimension, T, measured from the start of video to the

9、negative-going edge of line 25 H-sync in odd-numbered fields. 6.4 The start and end of the sync record must be produced by electronic switching of the recording signal due to geometric constraints (see SMPTE 18M). Phasing of the sync record electronic switching shall be as per phase dimension W in o

10、dd-numbered fields. 6.5 Even-numbered fields have a different video and sync phasing (dimensions U and X) due to the odd number of lines in a television frame. 7 Gapazimuth 7.1 The azimuth of all head gaps used to produce longitudinal track records shall be perpendicular to the direction of relative

11、 head-to-tape motion. 7.2 The azimuth of the video and sync head gaps shall be perpendicular to the direction of head motion. Page 2 of 5 pages SMPTE 19M-2003 DIRECTION OF I -TAPE TRAVEL I REFERENCE EDGE ABCDEFG Figure 1 - Record location and dimensions LINE DESIGNATIONS - AUD I - -s I Figure 2 - Vi

12、deo and sync record location Page 3 of 5 pages SMPTE 19M-2003 Table 1 - Record dimensions and recorded signals Dimensions Millimeters Minimum Maximum A? B? C D E F G1 G2 H J? K? L? M? N P Q R S2? S1 T U v W X Y Z 8 Audio 3 lower edge Audio 3 upper edge Sync track lower edge Sync track upper edge Con

13、trol track lower edge Control track upper edge Video track lower edge Video line 25 start Video track upper edge Audio 1 lower edge Audio 1 upper edge Audio 2 lower edge Audio 2 upper edge Video and sync track width Video offset Video track pitch Video track length Control track head distance (mecha

14、nical dimension) Control track head distance (tape footprint) Vertical phase odd field Vertical phase even field Sync track length Vertical phase odd sync field Vertical phase even sync field Vertical head offset Horizontal head offset Track angle 0.050 0.825 1.385 2.680 2.870 3.430 3.860 4.650 22.3

15、55 22.770 23.525 24.325 25.150 O. 125 4.067 ref (2.5 H) O. 1823 ref 41 0.764 ref (252.5 H) 1 16.23 1 14.70 16.270 ref (1 0.0 H) 17.080 ref (1 0.5 H) 25.620 ref (1 5.75 H) 22.360 ref (13.75 H) 23.170 ref (14.25 H) 1.529 ref 35.380 ref 2?34? ref 0.1 50 0.975 1.445 2.740 3.1 30 3.770 3.920 4.71 O 22.47

16、5 22.830 23.675 24.475 25.250 0.135 1 17.03 115.10 26.420 (16.25 H) 23.1 70 (1 4.25 H) 23.980 (14.75 H) NOTES ?) See annex A. Dimension S is not shown in figure 2. It is a physical transport dimension that should result in the footprint dimension S+. Page 4 of 5 pages SMPTE 19M-2003 Annex A (informa

17、tive) Dimensions Dimensions A, B, J, K, L, and M have been revised to reduce audio level interchange differences. Audio head stacks produced prior to this standard may produce track records with wider tolerances. Annex B (informative) Bibliography SMPTE 18M-2003, Television Analog Recording - 1-in Type C - Basic System and Transport Geometry Parameters ITU-R BT.470-6 (1 1/98), Conventional Television Systems Page 5 of 5 pages