1、STD-SMPTE RP 1b-ENGL 1997 8357401 0282b 910 SMPTE RECOMMENDED PRACTICE RP 160-1997 Revision of RP 160-1 991 Three-Channel Parallel Analog Component Hig h-Def inition Video Interface 1 Scope 1.1 This practice defines the physical charac- teristics of an interface using three parallel chan- nels for t
2、he interconnection of equipment operating with analog component HDTV signals. For ANSI/SMPTE 240M, the signals carried across this interface have a scanning structure of 1125 lines, 60.00 fields per second, 16:9 as- pect ratio, and 2:l interlace. This interface is also appropriate for HDTV signals h
3、aving other scanning structures. 1.2 The intended uses of this interface are: - to interconnect the elements of parallel analog HDTV video subsystems which use the same com- ponent sets within larger component islands or plants. Component HDTV editing and post-produc- tion suites are examples of suc
4、h subsystems; - to interconnect equipment into complete, self- contained HDTV analog component systems of relatively small size. 1.3 This practice applies to signals carried on the connectors described in 7.1 and may not apply to component signals carried on other types of connectors. The practice a
5、lso defines the preferred component video signals across the interface, including their waveform structure and levels. Page 1 of 6 pages indicated was valid. All standards are subject to revi- sion, and parties to agreements based on this practice are encouraged to investigate the possibility of app
6、ly- ing the most recent edition of the standard indicated below. ANSVSMPTE 240M-1995, Television - Signal Parameters - 11 25-Line High-Definition Production Systems 3 Video signals The signals carried across this interface may be those of either of two signal sets: a color set comprising ER, EG, and
7、 EB signals, or a color-difference set compris- ing EY, EPB, and EPR signals. Definitions of the signal sets may be found in ANSVSMPTE 240M and other relevant standards. Figures 1 and 2 illustrate the waveform structure, synchronizing signal, and video levels for these two component sets. 4 Impedanc
8、e Equipment using this interface shall have nominal 75-ohm input and output impedances. 5 Clamping and signal dc content The clamp period shown in figures 1 and 2 may be used as a dc level clamp reference point. If an ac coupled system is employed, the average dc level of any signal specified herein
9、 shall not exceed I 1 volt. 2 Normative reference 6 Component timing The following standard contains provisions which, through reference in this text, constitute provisions of this practice. At the time of publication, the edition The three component video signals (EG, EB, ER) or (Ey, EPB, EPR) shou
10、ld be simultaneous in real time. Copyright Q 1997 by the SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 Approved June 1,1997 (91 4) 761 -1 1 O0 STD-SMPTE RP LbO-ENGL 1777 = 8357403 0002827 857 W R P 160-1 997 1 I mv I Figure 1 -Waveform structure and
11、 levels of EG, EB, ER signals for 100% color bars Page 2 of 6 pages STD.SMPTE RP LbO-ENGL 1797 8357403 O002828 793 mvl 1: RP 160-1 997 1 a ,- 11 II 6 II I I. .I INCITF. hnritnntal ark Mt tn srnlsl Figure 2 - Waveform structure and levels of EY, Epg and EPR signals for 100% color bars Page 3 of 6 pag
12、es STD-SMPTE RP LbO-ENGL 1997 = 8357403 0002829 b2T RP 160-1997 - 1 - I -7 L .- I m Page 4 of 6 pages STD-SMPTE RP ZbO-ENGL 3997 8357403 0002830 341 m RP 160-1 997 N O- . f OE n: I- I - i d -I - - I I d w O N :i 7 O o 3 nl 4 II W o z W U W LL u1 U Page 5 of 6 pages RP 160-1997 7 Connector and cable
13、Two different connector implementations are permis- sible under this practice. The preferred implementa- tion incorporates a single multiconductor cable and keyed connector arrangement carrying all three par- allel signals. The secondary implementation utilizes three separate cables with BNC connect
14、ors carrying the three parallel signals. This clause describes the preferred implementation. 7.1 Connector The connector consists of three BNC inserts mounted in a rectangular housing. Latching is accomplished by two latch posts and receptacles, internal to the con- nector. Additional posts are util
15、ized for polarizing and reinforcing purposes. This practice defines the dimensions and tolerances necessary to permit the interchange of plug and socket connectors that contain the three BNC inserts. The plug interface is described in figure 3, and the socket interface in figure 4. The BNC pin and s
16、ocket are derived from MIL-PRF-39012D and are described in figures 3 and 4. Individual insert positions in each mating connector shall be marked with G, B, and R, respectively, as shown in figures 3 and 4. These position identifica- tions correspond to the cable coding. 7.2 Cable The recommended cab
17、le consists of three individual, insulated, coded, coaxial cables, all housed in a non- metallic jacket. Annex A (informative) Bibliography 7.2.1 Cable selection considerations HDTV component sets as specified, for example, in ANSVSMPTE 240M, are wideband signals. In choos- ing the coaxial cable to
18、implement this interface, the user should take account of the following: - 30-MHz bandwidth for each video component signal; - Differential timing between each of the three coaxial cables (this refers specifically to the toler- ance in cable transit time); - Crosstalk among the three coaxial cables;
19、 - A cable with nominal impedance of 75 ohms is recommended; - Return loss of the cable. 7.2.2 Cable color coding Each individual coax within this cable shall be uniquely coded to identify the signal to be carried upon it. The coding shall be: Coax coding Sianal carried Color green or letter G Color blue or letter B Color red or letter R EG or EY EB or EpB ER or EPR SMPTE 253, Television - Three-Channel RGB Analog Video Interface Frequency Connectors MIL-PRF-39012D, General Specification for Coaxial, Radio Page 6 of 6 pages
