1、-STD.SMPTE RP 15b-ENGL 1999 8357401 000394b 587 B SMPTE RECOMMENDED PRACTICE RP 156-1 999 Revision of RP 156-1995 Bar Code Labeling for Type D-1 Component and Type D-2 Composite Cassette Identification 1 Scope This practice describes the requirements for the generation of bar code labels for the aut
2、omatic identification of type D-1 component and type D-2 composite cassettes. Dimensions and tolerances of the printed bar code symbols are specified. The symbol encoding, data structure, and formatting of the label information are also specified. Lastly, the label characteristics, size, Orientation
3、, and placement are specified. This practice includes both rear and side labels. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this practice. At the time of publication, the edition indicated was valid. All standards
4、are subject to revision, and patties to agreements based on this practice are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. ANWSMPTE 226M-1996, Television Digital Record- ing - 19-mm Tape Cassettes 3 Bar code symbology The interleaved
5、2 of 5 bar codeshall be the symbology used for the identification of type D-1 and type D-2 cassettes. 3.1 General description The interleaved 2 of 5 bar code is a bidirectional, self checking, numerical bar code. Different start and stop characters are employed to permit bidirectional Page 1 of 8 pa
6、ges decoding. This bar code is a two-level code and employs a combination of wide and narrow elements to represent each symbol. The elements may be either bars or spaces. Wide elements are assigned a value of 1 and narrow elements a value of O. The characters are interleaved using bars to encode sym
7、bols in the odd data positions and spaces to encode symbols in the even positions. The position numbering of the symbols begins with the first character after the start character (data O). The inter- leaving process always requires an even number of characters. For example, if an odd number of chara
8、cters must be encoded, a leading O shall be used to change the number of characters to an even number (as shown in figure 1). 3.2 Code configuration Each symbol is comprised of five elements, two of which are wide and three narrow. Table 1 shows the code symbology for characters O through 9. Table 1
9、 - interleaved 2 of 5 bar code symbology Character Code O 1 2 3 4 5 6 7 8 9 O0110 10001 O1001 11000 O0101 10100 o1 100 O001 1 1 O01 o o1 o1 o Copyright Q 1999 by the SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdaie Ave., White Plains, NY 10607 (914) 761-1 100 Approved November 5,1
10、999 STD*SMPTE RP 35b-ENGL 1777 m 8357403 00037Y7 Y33 RP 156-1 999 The start and stop characters are encoded as follows (see figure 1): - start character 0000; - stop character 100. The start character is constituted by two narrow bars and two narrow spaces. The stop character is Constituted by one w
11、ide bar, one narrow space, and one narrow bar. The start character is at the normal left-hand end adjacent to the most significant character. The stop character is at the normal right-hand end adjacent to the least significant character. The interleaved 2 of 5 bar code is continuous because there ar
12、e no intercharacter gaps; all spaces contain information. Figures 1 and 2 show examples of encoded data. 3.3 Alphanumeric data For rear labels, mixed use of alpha characters, numerics, and symbols shall be permitted in fields defined as alphanumeric. These characters are encoded using a pair of nume
13、ric symbols. Symbol encoding is shown in table 2. Encoding for alpha- numeric characters may becalculated from thestandard ASCII value according to the formula shown below. Conversion from ASCII to the required format may be accomplished by subtracting 20hex from the hexa- decimal ASCII code and the
14、n converting the result to base 10. Required form = ASCllIhex - 20hex)io Refer to ANSI X3.4 for details concerning ASCII encoding. Table 2 defines alphanumeric characters that may be used for cassette bar code labels. An example of alpha encoding is as follows: To encode the letter A ASCII 41 hex -
15、20 hex The position of alphanumeric data is defined by the label format. Alphanumeric data shall be encoded, decoded, or both only in fields defined as alphanumeric. 3.4 Code density and dimensions The significant parameters of the interleaved 2 of 5 code are the width of the narrow elements and the
16、 ratio of the width of wide to narrow elements. For optimum automatic scanning, the bar height (see table 3), the codes position on the label, and the labels orientation on the cassette shall be specified (see 4.2 and 4.3, 5.1.1 and 5.1.2, 5.2.1 and 5.2.2). The width of a narrow element shall be 0.2
17、6 mm for rear labels and 0.68 mm for side labels. The minimum and maximum width of an element is determined by the application and constraints imposed by the spe- cific scanning equipment. This application requires the symbols to be printed in accordance with the ratios and tolerances specified in t
18、able 3. The ratio of the width of the wide elements to that of the narrow elements shall be 2.51. The width of the various elements and the nominal ratio of the width of the wide to narrow elements shall not change within a given bar code label. Figure 1 - Interleaved 2 of 5 bar code symbol Encoding
19、 O146 Figure 2 - Interleaved 2 of 5 bar code symbol Encoding 3852 Page 2 of 8 pages STD-SMPTE RP 156-ENGL 1999 8357901 0003940 35T RP 156-1 999 Lower O 1 2 3 4 5 6 7 8 9 Table 2 - Bar encoding of alphanumeric data SP 4 H R f P 2 ! + 5 ? I S I 9 q I # 7 A K U - i S 1 $ 8 B L v i t - % I 9 C M W a k U
20、 8 O D N X b I V 1 E O Y C m W ( 2 i F P Z d n X h r I Q J T A ,6 ) 3 - G Q e O Y Note 21 Table 3 - Bar code element dimensions and tolerances (All dimensions in millimeters) Narrow element width Wide Wideharrow ratio Bar Label (W) f (TI element width (NI height Rear 0.26 f 0.078 0.65 2.5 5.0 k 0.1
21、Side 0.68 f 0.23 1.70 2.5 10.0 f 0.5 3.5 Bar and space width tolerances 4. Bar code label details The allowable printing width tolerance (T) is a f unc- tion of the nominal width (W) of the narrow bars and spaces and the nominal ratio (N) Of the wide to narrow dements. The tolerance is defined as fo
22、llows: 4.1 Rear label There shall be three areas of information on the rear bar code label. These are listed from the top of the label to the bottom and each occupies the full length of the label (see figure 3): - user information area; - bar code symbols; - human readable interpretation of the bar
23、code. Thevalues of N for any interleaved 2 of 5 symbol must be in the range of 2 to 3. Forthe narrow element width and the specified ratio, the dimensions shall be as given in table 3. At each end of the bar code label, there shall be a quiet zone. The zone shall extend for a minimum of 3.5 mm beyon
24、d each end of the bar code extending toward the edges of the label. No markings of any kind Page 3 of 8 pages STDmSMPTE RP LSb-ENGL 1777 W 8357403 0003747 27b = RP 156-1999 are permitted in this area. For interchange of tape cassettes, any human readable information printed on this label shall be in
25、 the English language. 4.2 Rear label size and placement The rear bar code label shall be aff xed to the cassette in the recessed area designated as the rear label area as described in ANSVSMPTE 226M. The rear label dimensions shall be as follows (see figure 3): - length - width 138.7 mm f 0.2 mm; 1
26、7.5 mm + 3.0 mm - 0.1 mm. The labels thickness shall be in accordance with the specifications of ANSVSMPTE 226M. The label shall be oriented such that the label infor- mation can be read when the cassette is viewed from the rear edge with the top label area uppermost. 4.3 Label format Information ar
27、eas, dimensions, and tolerances for the rear-label area are shown in figure 3. 4.4 Rear label bar code data format The data in table 4 shall be encoded to identity the contents of a cassette. 4.5 Type number The type number defines the cassette as either a single-event cassette containing one identi
28、fied event or as a multievent cassette containing two or more identified events. 4.5.1 Type No. O, Single-event cassette The SOM and DUR fields on the label define the cue points for the identified event. 4.52 Type No. 1, Multiple-event cassette The SOM defines the time code location of an on-tape d
29、irectory containing the location of each identified segment on the tape. The DUR on the label is the sum of the individual segment durations that have been identified and are contained in the on-tape directory. E- E Ef z nz 0- E “QUIET ZONE. n o FREE OF YUIKINGS +I USER AREA BARCODE A 2 “E 0- 436.1
30、0.2na % LABEL ,-+E+- WITHIN iI.Omm E BARCODE Figure 3 - Rear label information areas, dimensions and tolerances Page 4 of 8 pages STDmSMPTE RP LSb-ENGL 1999 I8357403 0003950 TOB E RP 156-1 999 Table 4 - Rear label bar code data format 1 Symbol position Field Type Note 1 O Type number Numeric 1 1 +n
31、I dent if ic at io n nu m ber Alphanumeric 2 n+l +n+2 Separator 2 n+3 +40 Title Alphanumeric 2 41 +40 Start of message (SOM) Numeric 3 49 +56 Duration (DUR) Numeric 3 57 Checksum Numeric 4 NOTES 1 The type number shall be used to define the contents of the cassette as either a single-event (O) mscet
32、teoramultievent (1) cassette. A single bar code symbol is used to specify the type number. Type numbers 2 to 9 are resewed. 2 The identification number and title fields are alphanumeric and require 2 bar code symbols per character. A 20-character block is allocated to these fields. The identificatio
33、n number may be between 3 and 8 characters in length. A separator code is used to indicate the end of the identification number and the beginning of the title. The title data fills the remainder of the 20-character block. The separator code is always defined as 99 and is an unprinted character that
34、is reserved in the alphanumeric table for this purpose. 3 The SOM and DUR are numeric and are in the HHMMSSFF format. 4 S3,S2,S1 is the three-digit resultant of the following expression: (S3,S2,Sl) = 3x (dataO+data2+data4+ . +data56) + (datal+data3+data5+ . +data55). S1 is the least significant digi
35、t of that resultant and is used to calculate the checksum. Checksum = 10 - S1. If Si = O, then checksum = O. An example of dala encoded in the correct format is shown in figure 4 and the resulting bar code label is shown in figure 5. O 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 2
36、5 26 27 28 29 50 31 32 33 34 35 36 57 J8 39 4 101 1 171 1181 l19191913131314131513l6l3l73l8l3l9l4lOl4ll14121413141414151416l4l7l4l8 41 42 43 44 45 4 47 48 49 50 51 52 53 !54 55 56 57 - - Il 12131415161 11910101 1151310121412 UL. JI Soy = 12345619 WR = 0015%24 CHECKSW Figure 4 - Rear label bar code f
37、ormat Page 5 of 8 pages Figure 5 - Sample rear bar code label 4.6 Identification number and tile The identification number and title fields are alpha- numeric and variable in length. The total combined length is 20 alphanumeric characters (including the separator). This separator marks the end of th
38、e identification number data and the beginning of the title data. The cassette identification number is the primary identifier for the cassette. The minimum length shall be 3 characters and the maximum 8 characters. Leading spaces in this field are not permitted. Unused space in the field shall be f
39、illed with spaces (ASCII = 20hex). The title occupies the remaining portion of the field. The maximum size of the title field is 16 characters and the minimum 11 (corresponding to the minimum and maximum length of the identification number). Unused space in this field shall be filled with space char
40、acters. 4.7 SOM and DUR Both fields are numeric and are formatted in the HHMMSSFF format. The start of message (SOM) defines a time cade location to be interpreted as defined in 4.5. The duration (DUR) for type O cassettes shall specify the desired duration of the material. The duration (DUR) for ty
41、pe 1 cassettes shall be the sum of the segment durations identified on the tape. 4.8 Rear label user information area This area is reserved for user information and does not contain any essential machine readable data. Printed information in this area shall be separated vertically from the bar code
42、by a space of not less than 0.15 mm. The last two characters at the right end of the user information area are reserved and shall indicate the type of cassette, using the letter S for a type O (single event) cassette and the letter M for a type 1 (multiple event) cassette (see 4.5). 4.9 Rear label b
43、ar code symbol area This area contains the machine readable information and is formatted as described in 4.4. The bar code shall be centered vertically on the label within 1 mm of the labels horizontal centeriine. 4.1 O Rear label human readable interpretation This area is reserved for a translation
44、 of the bar code identification number, title, SOM, and DUR data. Printed information in this area shall be separated vertically from the bar code by a space of not less than 0.15 mm. 5 Side labels 5.1 Right-side label The areas of information on the right-side label are identified and located as sh
45、own in figure 6: - bar code symbols; - human readable interpretation of the bar code. At each end of the bar code label, there shall be a quiet zone. The zone shall extend for 9.0 mm k 0.5 rnm beyond each end of the bar code and is also shown in figure 6. 5.1.1 Right-side label size and placement Th
46、e right-side label shall be affixed to the sidelabel area of the cassette as shown in figure 7. Page 6 of 8 pages STD-SMPTE RP LSb-ENGL 1797 E 8357401 0003752 880 6 RP 156-1999 The right-side label dimensions shall be as follows: 5.1 1 Right-side label format - length: - width: 58.5 mm +_ 0.5 mm; 20
47、.5 mm +_ 0.5 mm. Information areas, dimensions, and tolerances for the right-side label are shown in Fig. 7. The labels thickness shall be in accordance with specifications defined in ANSVSMPTE 226M. The label shall be oriented such that the label infor- mation can be read when the cassette is viewe
48、d from the side with the top label area uppermost. 5.1.3 Right-side label bar code symbol area This area contains the machine readable information and is formatted as described in 3.2. The bar code shall be nominally offset 2 mm vertically above the centerline of the label. bse.5 10.54 t 20.5 i0.5 I
49、 I l 1, Il ht L10 IO.5 8 tO.5 I :0.5 coou) NO. IN HUMAN- J A CODE 1 REMABLE FONT i6 DIGIT NO.) Figure 6 - Right-side label information areas, dimensions and tolerances 7 NOMINAL emcooE CENTERL I NE oAm-EX7 / I/ / PLANE NOMINAL CASSETTE CENITRLINE Figure 7 - Location of right-side label Page 7 of 8 pages RP 156-1999 LABEL RECESS AREA SAME SIZE AND LOCATION hs RIGHT SIDE 7 AREA AVAILABLE t-se.s 10.5 4X R Z MAX / 4.5 ta.5 I 1 t0.5 SAME NO. AS RIGHT LABEL IN HUMAN-READABLE FONT + Figure 8 - Location of left-side label Figure 9 - Left-side information
