1、 Approved September 25, 2013 Copyright 2013 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 st Table of Contents Page Foreword . 2 Intellectual Property 2 Introduction 2 1 Scope . 3 2 Conformance Notation . 3 3 Normative References . 3
2、 4 Video Data Signal Format Encoding/Analog Timing Parameters . 4 4.1 4:4:4 Encoding Characteristics for 13.5 MHz and 18 MHz systems 4 4.2 4:2:2 Encoding Characteristics for 13.5 MHz and 18 MHz systems 5 4.3 Analog Horizontal Timing Relationship 13.5 MHz 4:2:2 (625-Line Values are in Parenthesis) .
3、5 4.4 Analog Horizontal Timing Relationship 18 MHz 4:2:2 (625-Line Values are in Parenthesis) . 8 5 Video Data Signal Format 9 5.1 Data Signal Format 10 5.2 Multiplex Structure . 10 5.3 Timing Reference Signals Video . 10 5.4 Active Video Payload . 11 6 Ancillary Data Signal Format Optional 12 6.1 D
4、igital Vertical Interval Time Code and Video Index Optional 13 7 Standard Compliance . 14 Annex A Bibliography (Informative) . 15 Annex B Filter Templates (Informative) . 16 Annex C Error Detection and Correction in the Video Timing Reference Signal (Informative) . 20 Annex D Data Formatting for 4:4
5、:4:4 Component Video Signals (Dual Link) (Normative) . 21 D.1 Overview 21 D.2 4x4 Component Signal Source 21 D.3 Analog Waveform to Digital Data Timing Relationship 525 Lines (625) . 21 D.4 Timing Reference Signals Video . 23 D.5 GBRA Signals 24 Annex E Possible Implementations Encoding/Decoding Mat
6、rices (Informative) 25 Page 1 of 26 pages SMPTE ST 125:2013 Revision of SMPTE 125M-1995 Replacement of SMPTE 267M-1995 Replacement of SMPTE RP 175-1995 SMPTE STANDARD SDTV Component Video Signal Coding 4:4:4 and 4:2:2 for 13.5 MHz and 18 MHz Systems SMPTE ST 125:2013 Page 2 of 26 pages Foreword SMPT
7、E (the Society of Motion Picture and Television Engineers) is an internationally-recognized standards developing organization. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 countries on six continents. SMPTEs Engineering Documents, including Standards,
8、Recommended Practices, and Engineering Guidelines, are prepared by SMPTEs Technology Committees. Participation in these Committees is open to all with a bona fide interest in their work. SMPTE cooperates closely with other standards-developing organizations, including ISO, IEC and ITU. SMPTE Enginee
9、ring Documents are drafted in accordance with the rules given in Part XIII of its Operations Manual. SMPTE ST 125 was prepared by Technology Committee 10E. Intellectual Property At the time of publication no notice had been received by SMPTE claiming patent rights essential to the implementation of
10、this Engineering Document. However, attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. SMPTE shall not be held responsible for identifying any or all such patent rights. Introduction This section is entirely informative and does not
11、form an integral part of this Engineering Document. This standard replaces previous versions of SMPTE ST 125, SMPTE ST 267 and SMPTE RP 175. In addition, 625-line values have been included. The parallel representation of the digital signal has been made an informative Annex, reflecting past implemen
12、tation practice. This standard is backwards compatible with the previous version of SMPTE ST 125 and SMPTE ST 267. The 625-line characteristics for 13.5 MHz sampling is backwards compatible with Recommendation ITU-R BT.601 625-line values are often included in brackets. SMPTE ST 125:2013 Page 3 of 2
13、6 pages 1 Scope This standard defines the digital video coding for 4:4:4 and 4:2:2 color spaces and a virtual parallel interface for 525/625-line interlaced systems. Two luma sampling rates are defined: 13.5 MHz and 18 MHz. The virtual parallel signal interface format is required as the source for t
14、he 10 bit serial interface defined in SMPTE ST 259. Annex D covers video coding for the 4:4:4:4 member of the family, including multiplexing details for dual channel operation. 2 Conformance Notation Normative text is text that describes elements of the design that are indispensable or contains the
15、conformance language keywords: “shall“, “should“, or “may“. Informative text is text that is potentially helpful to the user, but not indispensable, and can be removed, changed, or added editorially without affecting interoperability. Informative text does not contain any conformance keywords. All t
16、ext in this document is, by default, normative, except: the Introduction, any section explicitly labeled as “Informative“ or individual paragraphs that start with “Note: The keywords “shall“ and “shall not“ indicate requirements strictly to be followed in order to conform to the document and from wh
17、ich no deviation is permitted. The keywords, “should“ and “should not“ indicate that, among several possibilities, one is recommended as particularly suitable, without mentioning or excluding others; or that a certain course of action is preferred but not necessarily required; or that (in the negati
18、ve form) a certain possibility or course of action is deprecated but not prohibited. The keywords “may“ and “need not“ indicate courses of action permissible within the limits of the document. The keyword reserved indicates a provision that is not defined at this time, shall not be used, and may be
19、defined in the future. The keyword forbidden indicates reserved and in addition indicates that the provision will never be defined in the future. A conformant implementation according to this document is one that includes all mandatory provisions (“shall“) and, if implemented, all recommended provis
20、ions (“should“) as described. A conformant implementation need not implement optional provisions (“may“) and need not implement them as described. Unless otherwise specified, the order of precedence of the types of normative information in this document shall be as follows: Normative prose shall be
21、the authoritative definition; Tables shall be next; followed by formal languages; then figures; and then any other language forms. 3 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publicati
22、on, 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 Recommendations indicated below. Recommendation ITU-R BT.601-7, Studio Encoding Para
23、meters of Digital Television for Standard 4:3 and Wide Screen 16:9 Aspect Ratios Recommendation ITU-R BT.1700, Characteristics of Composite Video Signals for Conventional Analogue Television Systems SMPTE ST 125:2013 Page 4 of 26 pages 4 Video Data Signal Format Encoding/Analog Timing Parameters Spe
24、ctral characteristics of signals to be encoded shall be bandwidth-constrained to minimize aliasing. Suggested filter characteristics are described in Annex B, Figures B.1 through B.4. 4.1 4:4:4 Encoding Characteristics for 13.5 MHz and 18 MHz Systems Table 1a 4:4:4 Encoding Parameters 13.5 MHz and 1
25、8 MHz Systems Parameters 525-line, 60/1.001 field/s systems 625-line, 50 field/s systems Sampling frequency for each signal 13.5 MHz 18 MHz 13.5 MHz 18 MHz Coded signals These values are obtained from the gamma pre-corrected signals Y = 0.299R + 0.587G + 0.114B CR = 0.713 (R-Y) = 0.500R - 0.419G - 0
26、.081B CB = 0.564 (B-Y) = 0.500B - 0.169R - 0.331G Number of samples per total line for Y,CB,CR,R,G,B 858 (Active 720) 1144 (Active 960) 864 (Active 720) 1152 (Active 960) Sampling structure Orthogonal, line, field and frame repetitive. The three sampling structures to be coincident, and also coincid
27、ent with the luma sampling structure of the 4:2:2 member. Form of coding Uniformly quantized PCM, 10 bits per sample Correspondence between video signal levels and the quantization levels for each sample Y, R, G, B, 877(10) quantization levels with the black level corresponding to level 64(10) and t
28、he peak white level corresponding to level 940(10) Each color-difference signal 897(10) quantization levels with zero signal corresponding to level 512(10) SMPTE ST 125:2013 Page 5 of 26 pages 4.2 4:2:2 Encoding Characteristics for 13.5 MHz and 18 MHz Systems Table 1b 4:2:2 Encoding Parameters 13.5
29、MHz and 18 MHz Systems Parameter Value Coded signals: These values are obtained from the gamma pre-corrected signals Y = 0.299R + 0.587G + 0.114B CR = 0.713 (R-Y) = 0.500R - 0.419G - 0.081B CB = 0.564 (B-Y) = 0.500B - 0.169R - 0.331G Number of samples per line: luma (Y) each color-difference signal
30、(CR, CB) total number of samples 13.5 MHz Sampling 525 625 18 MHz sampling 525 625 858 (Active 720) 429 (Active 360) 1716 864 (Active 720) 432 (Active 360) 1728 1144 (Active 960) 572 (Active 480) 2288 1152 (Active 960) 576 (Active 480) 2304 Sampling structure: luma (Y) each color-difference signal (
31、CR, CB) Orthogonal: line, field, and frame repetitive; CR and CB samples are cosited with odd (1st, 3rd, 5th) samples in each line. 13.5 MHz sampling 13.5 MHz 6.75 MHz 18 MHz sampling 18 MHz 9 MHz Form of coding Uniformly quantized PCM 10 bits per sample Correspondence between video signal levels an
32、d the quantization levels Luma (Y): Color difference signal Levels (CR, CB): Note: 8-bit systems complying with previous versions of this standard can exist 877(10) quantization levels with the black level corresponding to level 64(10) and the peak white level corresponding to level 940(10) 897(10)
33、quantization levels with zero signal corresponding to level 512(10) Construction of the Luma and color-difference signals contained in tables 1a and 1b shall conform to the detailed text contained in Recommendation ITU-R BT.601, Section 2. 4.3 Analog Horizontal Timing Relationship 13.5 MHz 4:2:2 (62
34、5-Line Values are in Parenthesis) Figure 1a and Table 1c define the relationship between video signal in the digital and analog domains for 525/625-line systems. Analog Sync shall be as defined in Recommendation ITU-R BT.1700. Figure 1b shows the multiplex structure. Transmitted during each active l
35、ine are 1440 multiplexed luma and color-difference values: 720 luma, 360 CR, and 360 CB values. SMPTE ST 125:2013 Page 6 of 26 pages Eight of the remaining 276 (288) interface clock intervals are used to transmit synchronizing information; the other 268 (280) interface clock intervals may be used to
36、 carry optional ancillary information. The first of these 1716 (1728) interface clock intervals is designated line word 0 for the purpose of reference only. The 1716 (1728) sample words per total line are therefore numbered 0 through 1715 (1727). Intervals 0 through 1439, inclusive, contain video da
37、ta. The interface clock intervals occurring during digital blanking are designated 1440 through 1715 (1727). Intervals 1440 through 1443 are reserved for the (End-Of-Active-video) EAV timing reference described in Section 5.3. Intervals 1712 (1724) through 1715 (1727) are reserved for the (Start-Of-
38、Active-video) SAV timing reference described in Section 5.3. 7 1 9Y c1b 2a 14 : 2 : 2S a m p l i n g 11l a s t S a m p l e o f D i g i t a l A c t i v e L i n eS a m p l e D a t a f o r 0HF i r s t S a m p l e o f D i g i t a l A c t i v e L i n eeeffD i g i t a l B l a n k i n g0 Hg hC RC BD r a w
39、i n g N o t t o s c a l eA n a l o g H s y n cD i g i t a l l i n e nA n a l o g l i n e n - 1A n a l o g l i n e nFigure 1a Analog Horizontal sync relationship Note: Table 1c provides exact sample numbers for the various standards. SMPTE ST 125:2013 Page 7 of 26 pages Table 1c Timing Analog Sync /
40、Digital Sample number Parameter 13.5 MHz Sampling 18 MHz Sampling 525 Lines 625 Lines 525 Lines 625 Lines a - Last Y sample- Active line Sample 719 Note: Sampling instants are sample Number +1. Sample 959 Note: Sampling instants are sample Number +1. b - 0H Analog reference The half-amplitude point
41、of the leading (falling) edge of the analog horizontal sync signal shall be coincident with a Y sample which would be conveyed by sample 736. The half-amplitude point of the leading (falling) edge of the analog horizontal sync signal shall be coincident with a Y sample which would be conveyed by sam
42、ple 732. The half-amplitude point of the leading (falling) edge of the analog horizontal sync signal shall fall between samples 981 and 982. The half-amplitude point of the leading (falling) edge of the analog horizontal sync signal shall be coincident with a Y sample which would be conveyed by samp
43、le 976. c -First Y sample- Active line Sample 0 d - Last CR/CB sample- Active line Sample 359 Sample 479 e - CR/CB -0H analog reference. The Y sample reference a is the normative reference point. The half-amplitude point of the leading (falling) edge of the analog horizontal sync signal shall be coi
44、ncident with a CR/CB sample 368. The half-amplitude point of the leading (falling) edge of the analog horizontal sync signal shall be coincident with a CR/CB sample 366. The half-amplitude point of the leading (falling) edge of the analog horizontal sync signal shall fall between CR/CB sample 490 an
45、d 491. The half-amplitude point of the leading (falling) edge of the analog horizontal sync signal shall be coincident with CR/CB sample 488. f - First CR/CB sample - active line Sample 0 g - Sample period between last active line sample to 0H 16 T 12 T 21.5 T 16 T h - 0H to first active line sample
46、 122 T 132 T 162.5 T 176 T T= Luma sampling period SMPTE ST 125:2013 Page 8 of 26 pages 7 1 97 2 0Y o r G7 2 108 5 7( 8 6 3 )017 3 6( 7 3 2 )27 1 9 7 2 0 7 2 1 01CRo r RCBo r BA u x7 1 9 7 2 0 7 2 17 2 17 2 17 2 07 2 07 1 97 1 97 3 6( 7 3 2 )7 3 6( 7 3 2 )7 3 6( 7 3 2 )8 5 7( 8 6 3 )08 5 7( 8 6 3 )8
47、 5 7( 8 6 3 )8 5 7( 8 6 3 )000111222l a s t S a m p l e o f D i g i t a l A c t i v e L i n eS a m p l e D a t a f o r 0HF i r s t S a m p l e o f D i g i t a l A c t i v e L i n eY721CR720Y720CB720Y719Y719R e p l a c e d b y t i m i n g r e f e r e n c e s i g n a lS e r i a l L i n k AS e r i a l
48、L i n k BCR736(732)Y736(732)CB736(732)CB736(732)Y736(732)CR736(732)E A VE A VR e p l a c e d b y t i m i n g r e f e r e n c e s i g n a lY857(863)CB0Y0CR856(862)Y856(862)CB856(862)Y855(861)CR0S A VR e p l a c e d b y t i m i n g r e f e r e n c e s i g n a l14401441144214391472(1464)1473(1465)Y855(
49、861)1711(1723)1715(1727)CB0A0CR0A719CB7211439144014411442A720CR721A721CB737(733)A736(732)CR737(733)A719CB737(733)A736(732)CR737(733)N o t e - V a l u e s i n ( ) a r e 6 2 5 l i n e v a l u e sA855(861)CB857(863)A856(862)CR857(863)A857(863)CB1Y0CR1R e p l a c e d b y t i m i n g r e f e r e n c e s i g n a lA855(861)S A VCB1A0CR11472(1464)1473(1465)1711(1723)1715(1727)W o r d N u m b e rW
