1、- - - STD-SMPTE 260M-ENGL 1999 8357403 0003463 289 SMPTE STANDARD for Television - 11 25/60 High-Definition Production Digital Representation and Bit-Parallel Interface SMPTE 260M-1999 Revision of SMPTE 260M-1992 System - Table of Contents 1 Scope 2 Applications 3 Normative references 4 Digital enco
2、ding and format specifications 5 Bit-parallel interface Annex A Pre- and post-filtering characteristics Annex B Production aperture issues Annex C Electrical characteristics of the interface Annex D Example of cable implementation Annex E Eye diagrams for ANSVSMPTE 240M analog signals Page 1 of 29 p
3、ages this standard. At the time of publication, the editions indicated were 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 standards indicated below. ANSVSMPTE 240
4、M-1995, Television - Signal Parameters - 1125-Line High-Definition Production Systems ITU-R BT.601-5 (1 994), Studio Encoding Parameters of Digital Television for Standard 4:3 and Wide- Screen 16:9 Aspect Ratios 1 Scope This standard specifies the digital representation of the signal parameters of t
5、he 11 25/60 high-definition production system as given in their analog form by ANWSMPTE 240M. This standard also specifies the signal format and the mechanical and electrical characteristics of the bit- parallel digital interface for the interconnection of digi- tal television equipment operating in
6、 the 1125/60 high-definition production system. 2 Applications The technical information provided in this standard applies to origination, storage, interconnection, and processing of digital 11 25/60 high-definition produc- tion system signals as they exist in studio production and post-production e
7、nvironments. 3 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of ITU-R BT.656-3, Interfaces for Digital Component Video Signals in 525-Line and 625-Line Television Systems Operating at the 4:2:2 Level of Recommen- dation I
8、TU-R BT.601 Part A 4 Digital encoding and format specifica- tions for ANSVSMPTE 24M analog signals 4.1 General considerations This standard complements the technical specifica- tions of the analog signals described in ANSVSMPTE 240M. The studies that resulted in this standard have taken into account
9、 prior international technical agreements on the digitization of television signals, as documented in ITU-R BT.601 and 656. For ease of comparison, the description of the bit-parallel interface follows the same form as that in ITU-R BT. 656. The digital coding is based on the use of one lumi- nance,
10、 E./, and two color-difference signals, EcB, and Ed, or on the use of three primary color signals EG, EB, ER. Copyright 0 1999 by WE SOCIEW OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hamdale Ave., White Plains. NY 10607 (91 4) 761 -1 100 Approved January 4,1999 Ey, Ed, ECR are transmitted at
11、the 22:11:11 level of the ITU-R (CCIR) digital hierarchy for digital televi- sion signals, with a nominal sampling frequency of 74.25 MHz for the luminance signal and 37.125 MHz for each of the color-difference signals. EG, EB, ER signals are transmitted at the 22:22:22 level of the ITU-R digital hi
12、erarchy with a nominal sampling frequency of 74.25 MHz. Provision is made for the coding of the ANSVSMPTE 240M signals to a precision of 8 or 10 bits. Technical information is given in annex A) concerning an example of filter characteristics for pre- and post- filtering of the ANSVSMPTE 240M signals
13、. This standard describes the bit-parallel digital inter- face only. The complete specification of the bit-serial interface requires further studies. However, in defining the digital representation, consideration has been given to making the signal format equally applicable to the bit-serial interfa
14、ce. The interface consists of one transmitter and one receiver in a point-to-point connection. The bits of the digital code words that describe the video signal are transmitted in parallel using 1 O con- ductor cables (shielded twisted pairs) for each of the component signals. Each pair carries bits
15、 at a nominal sample rate of 74.25 Mwords/s. For the transmission of Ey, EcB, EcR, the color-difference components are time-multiplexed into a single signal EcB/EcR of 74.25 Mwordds. The digital bit-parallel interface uses a 93 multipin connector for transmission of EY, EcB, EcR, or for transmission
16、 of EG, EB, ER, with 8- or 10-bit preci- sion. The connecting cable shall carry 31 shielded conduc- tor pairs for transmission of EG, Ed, ER signals or for transmission of EY, EcB/EcR components and an additional data stream (auxiliary channel). Twenty- one shielded conductor pairs shall be used in
17、the case of E E P a O d hl w a u) Z w O Q C m O Q (D C O Q 0 c a - ici E .- U - E E .- .- c o C a Q c rc E 0 ici 8 I F L 3 w IA .- Page 4 of 29 pages - STDmSMPTE 2bOM-ENGL 1999 8357401 00034b5 924 SMPTE 260M-1999 4.3 Common signal format for digital interfaces 4.3.2.3 Timing relationship between vid
18、eo data and the analog synchronizing waveform 4.3.1 General description 4.3.2.3.1 Line interval The digital interface provides a unidirectional inter- connection between a single source and a single destination. A signal format common to both parallel and serial interfaces is described below. The da
19、ta signals shall be in the form of binary information coded in 8- or 1 O-bit words. These signals are: - video data; -timing reference codes; - ancillary data; - identification codes. The characteristics of the data word at the interface shall be based on the assumption that the location of any requ
20、ired sin(x)/x correction is at the point where the digital signal is converted to an analog format. 4.3.2 Video data Figure 1 depicts the timing relationship between the digital video and the analog line sync waveform. The digital active line shall begin 192 clock periods after the rising edge of th
21、e analog, tri-level, line sync pulse (the zero crossing point is labelled OH in figure 1). The precise timing shall be specified between half-ampli- tude points. Lines shall be numbered from 1 through 1125 as shown in figures 2A and 28. 4.3.2.3.2 Field interval The start of the digital field shall b
22、e determined by the position specified by the start of the digital line. The digital field shall start coincident with the end of active video (EAV) timing reference code of the lines indi- cated in table 2. Field blanking in the digital interface shall be in full-line increments. 4.3.2.4 Video timi
23、ng reference codes (SAV, EAV) 4.3.2.1 Coding characteristics The video data are in compliance with ANSVSMPTE 240M and with the field blanking definition shown in table 2. 4.3.2.2 Video data format For a 10-bit system, the data levels O to 3 and 1020 to 1023 (OOOh to 003h and 3FCh to 3FFh in the hexa
24、- decimal representation) shall be reserved for timing identification purposes. Consequently, data levels 4 through 1019 (004h through 3FBh) shall be used to express quantized signal values. For an 8-bit system, data levels O and 255 (ooh and FFh) shall be reserved to indicate timing references. Dig
25、ital levels 1 through 254 (Olh through FEh) shall be used to represent quantized signal values. The video data words shall be conveyed across the digital interface using multiple bit-parallel channels; luminance Ey and time-multiplexed color-difference signal EcB/EcR or the three primary color signa
26、ls Ed, EB, ER. Each parallel channel consists of 8 or 10 bits and the transmission rate shall be 74.25 Mwordds. Co-sited samples of the two color-differ- ence signals shall be time-multiplexed in the order ECB and EcR. There shall be two timing reference codes, one at the beginning of each video dat
27、a block (start of active video, SAV) and another at the end of each video data block (end of active video, EAV). These codes are shown in figure 1. The timing reference codes shall be Table 2 - Field interval definition V: Digital field blanking Field 1 Start Line 11 21 (V=l) (V=O) (V=l) (V=O) Finis
28、h Line 41 Field 2 Start Line 558 Finish Line 603 F: Digital field identification Field 1 F=O Line 1 Field 2 F=l Line 564 NOTES 1 Signals F and V shall change state synchronousll with the end of active video (EAV) timing reference code, at the beginning of the digital line. 2 Definition of line numbe
29、rs is given in ANSVSMPTE 240M. Digital line numbers shall change state prioi to the horizontal timing reference point (OH), a: shown in figure 1. Page 5 of 29 pages SMPTE 260M-1999 Page 6 of 29 pages STDnSMPTE 2bOM-ENG - I- in in - 3999 M i3357403 O003467 T7 = U SMPTE 260M-1999 Page 7 of 29 pages ST
30、D-SMPTE 260M-ENGL 3999 CMPTE 260M-1999 contiguous with the video data, when present, and continue through the field blanking interval. The SAV and AV codes shall be the digital interface line synchronization signals and shall be carried on every line by all component signals, namely, EY, EcB, EcR, a
31、nd EG, EB, ER. The interval starting at EAV and ending with SAV shall be the digital line blanking period as shown in figure 1. Each timing reference code shall consist of a four- word sequence in the following format for a 10-bit system: 3FFh, OOOh, OOOh, XYZh (in hexadecimal no- tation). The first
32、 three words shall be a fixed preamble. The fourth word contains information defining: -field 2 identification; - state of field blanking; -state of line blanking. = 8357403 0003468 633 The assignment of bits within the timing reference codes shall be as shown in table 3. For an 8-bit system, the bi
33、ts of each timing reference word are selected starting from the MSB of each of the words specified in table 3 (note that FFh and OOh are reserved for use in timing reference codes). Bits PO, P1, P2, and P3 in table 3 have logic values that depend on the states of bits F, V, and H and are shown in ta
34、ble 4. At the receiver this arrangement permits one-bit errors to be corrected and two-bit errors to be detected. 4.3.2.5 Ancillary data NOTE - The precise location of the ancillary data blocks and the coding of words 3, 4, and 5 (see figure 3) requires further study. Table 3 - Video timing referenc
35、e codes 7 6 Bit Number 5 4 3 2 First 1 1 1 1 1 1 1 1 1 1 Second O O O O O O O O O O Third O O O O O O O O O O Fourth 1 F V H P3 P2 P1 PO O O F= O during field 1 1 during field 2 V= O elsewhere H= O in SAV 1 in EAV 1 during field blanking NOTES 1 PO, P1, P2, P3: protection bits (see table 4). 2 MSB:
36、most significant bit. 3 LSB: least significant bit. 4 Table 2 defines the logic state of the V and F bits. Table 4 - Protection bits for SAV and EAV Bit No. 9 8 7 6 5 4 3 2 1 O O O Fixed Fixed F V H P3 P2 P1 1 Function Fixed Page 8 of 29 pages STDmSMPTE 2bOM-ENGL 1999 Ancillary data may be inserted
37、synchronously into the videoldata multiplex during the blanking intervals at a rate of 74.25 Mwords/s. Figure 3 shows the configu- ration of the ancillary data block. It shall consist of the ancillary timing reference signal code (ANC) and the data field. The word length of both the code and the dat
38、a is 10 bits. Small blocks of data, less than (or equal to) 272 words in total length, including the ANC sequence (as de- scribed below) may be carried within the line blanking period of each video component on every line (follow- ing the EAV timing reference code). For the luminance Ey and EG, Ed,
39、ER channels, large blocks of data, up to 1920 words in total length (including the ANC sequence), may be carried within the interval starting with the end of SAV and terminat- ing with the beginning of EAV, on the 90 lines con- tained in the digital field blanking periods. The time-multiplexed EcB/E
40、cR channel may also provide 1920 words of transmission capacity for each of these lines. Ancillary data may be optionally carried in the - 8357401 O003469 57T SMPTE 260M-1999 active portion of any of the other lines that comprise the field interval. 4.3.2.5.1 Ancillary data signal format Further stu
41、dies are needed for a final decision on the signal format of the ancillary data. 4.3.2.5.2 Timing reference signal for ancillary data (ANC) Each ancillary data block shall be preceded by the ancillary timing reference signal code (ANC), shown in figure 3. The first three words shall be a fixed pream
42、ble. The fourth word, noted as TIT,” shall contain data identi- fication codes which will be determined at a future time as part of the studies required to complete the specification of the ancillary data signal format. Words 4 (MMM) and 5 (LLL) shall contain either the line number or the data word
43、count. When ANC is used to transmit the video line number, the line number shall be carried by the two words shown as “MMM” and I ANC Code I Data Field I Word I 0 1 234 O00 3FC 3FC TIT MMM LU XXX Fixed preamble Data Words Word count or line number (Note) (000h - 003h and 3FCh - 3FFh excluded) Data t
44、ype (Note) Bit 9 8 7 6 5 4 3 2 1 O WordLLL 0 t odd word parity NOTE - “Word count” shall specify the length of the data field and shall lie in the range 1 - 1914. If word TTT indicates a video line number then D11 to DO shall contain the binary equivalent of the line number and the word count shall
45、be zero. The ancillary blocks may be transmitted when time is available during line or field blanking following the EAV timing reference code. Figure 3 - Ancillary data block Page 9 of 29 pages “LLL” and no ancillary data shall follow. Each word shall consist of six bits of data and a parity bit (od
46、d parity). The two least significant bits and bit 9 shall be set to zero. ANC can occur multiple times per line period if different blocks of data are carried. The ANC and its associated data block shall not occupy the intervals reserved for EAV, SAV, or active video. 4.3.2.6 Data transmission durin
47、g blanking inter- vals In an 8-bit system, the data words occurring during digital blanking intervals, that are not used for the timing reference codes SAV, EAV, and ANC or for ancillary data, shall be filled with the sequence 1011, loh, . . ., which corresponds to the blanking level of the luminanc
48、e EY (or EG, EB, ER) or 80h, 80h, . . ., which corresponds to the blanking level of the time- multiplexed color-difference signals EcB/EcR. In a 10-bit system, the digital blanking intervals are filled with the sequence 040h, 040h, . . ., which corre- sponds to the blanking level of the luminance EY
49、 (or EG, Ed, ER) or 20011, 200h, . . . , which corresponds to the blanking levels of the time-multiplexed color-dif- ference signals EcBEcR. 5 Bit-parallel interface 5.1 General description of the interface This section specifies a bit-parallel digital interface for the interconnection of digital television equipment operating in the production system specified in ANSVSMPTE 240M. 5.1.1 EY, Ed, ECR system The bits of the digital code words that describe the signal, which consists of the luminance E./ and tw
