RECOMMENDATION ITU-R BT.601-5 STUDIO ENCODING PARAMETERS DIGITAL TELEV

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RECOMMENDATION ITU-R BT.601-5 STUDIO ENCODING PARAMETERS DIGITAL TELEV

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Rec. ITU-R BT.601-5 SECTION 11B: DIGITAL TELEVISION
RECOMMENDATION ITU-R BT.601-5 STUDIO ENCODING PARAMETERS DIGITAL TELEVISION STANDARD WIDE-SCREEN 16:9 ASPECT RATIOS (Question ITU-R 206/11)
(1982-1986-1990-1992-1994-1995)
Rec. ITU-R BT.601-5
Radiocommunication Assembly, considering that there clear advantages television broadcasters programme producers digital studio standards which have greatest number significant parameter values common 525-line 625-line systems; that worldwide compatible digital approach will permit development equipment with many common features, permit operating economies facilitate international exchange programmes; that extensible family compatible digital coding standards desirable. Members such family could correspond different quality levels, different aspect ratios, facilitate additional processing required present production techniques, cater future needs; that system based coding components able meet these desirable objectives;
that co-siting samples representing luminance colour-difference signals (or, used, red, green blue signals) facilitates processing digital component signals, required present production techniques, recommends that following used basis digital coding standards television studios countries using 525-line system well those using 625-line system:
Introduction
This Recommendation specifies methods digitally coding video signals. includes 13.5 sampling rate both 16:9 aspect ratios with performance adequate present transmission systems. alternative sampling rate those 16:9 systems which require proportionately higher horizontal resolution also specified. Specifications applicable member this family standards presented first. Then follows Part specific characteristics 13.5 sampling Part specific characteristics sampling.
Extensible family compatible digital coding standards
digital coding should allow establishment evolution extensible family compatible digital coding standards. should possible interface simply between members family. digital coding should based luminance colour-difference signals (or, used, red, green blue signals).
Rec. ITU-R BT.601-5
spectral characteristics signals must controlled avoid aliasing whilst preserving passband response. Filter specifications shown Appendix Part Appendix Part
Specifications applicable member family
Sampling structures should spatially static. This case, example, orthogonal sampling structures specified Part Part samples represent luminance simultaneous colour-difference signals, each pair colourdifference samples should spatially co-sited. samples representing red, green blue signals used they should co-sited. digital standard adopted each member family should permit worldwide acceptance application operation; condition achieve this goal that, each member family, number samples line specified 525-line 625-line systems shall compatible (preferably same number samples line). applications these specifications, contents digital words expressed both decimal hexadecimal forms, denoted suffixes respectively. avoid confusion between 8-bit 10-bit representations, eight most-significant bits considered integer part while additional bits, present, considered fractional parts. example, pattern 10010001 would expressed 145d 91h, whereas pattern 1001000101 would expressed 145.25d 91.4h. Where fractional part shown, should assumed have binary value
Definition digital signals from primary (analogue) signals
This section describes, with view defining signals rules construction these signals from primary analogue signals signals constructed following three stages described 3.5.1, 3.5.2 3.5.3. method given example, practice other methods construction from these primary signals other analogue digital signals produce identical results. example given 3.5.4. 3.5.1 Construction luminance colour-difference signals
construction luminance colour-difference signals follows:
0.299 0.587 0.114
whence:
0.299 0.587 0.114 0.701 0.587 0.114
and:
0.299 0.587 0.114 0.299 0.587 0.886
Taking signal values normalized unity (e.g. maximum levels), values obtained white, black saturated primary complementary colours shown Table
Rec. ITU-R BT.601-5
TABLE Normalized signal values
Condition White Black Green Blue Yellow Cyan Magenta
0.299 0.587 0.114 0.886 0.701 0.413
0.701 0.587 0.114 0.114 0.701 0.587
0.299 0.587 0.886 0.886 0.299 0.587
3.5.2
Construction re-normalized colour-difference signals (ECR
Whilst values have range those have range 0.701 0.701 range 0.886 0.886. restore signal excursion colour-difference signals unity (i.e. 0.5), coefficients calculated follows:
Then:
0.713;mmmmmmKB 0.564 0.701 0.886
0.713 0.500 0.419 0.081
and:
0.564 0.169 0.331 0.500
where re-normalized blue colour-difference signals respectively (see Notes NOTE symbols will used only designate re-normalized colour-difference signals, i.e. having same nominal peak-to-peak amplitude luminance signal thus selected reference amplitude. NOTE circumstances when component signals normalized range example, when converting from analogue component signals with unequal luminance colour-difference amplitudes, additional gain factor will necessary gain factors should modified accordingly.
3.5.3
Quantization
case uniformly-quantized 8-bit binary encoding, i.e. 256, equally spaced quantization levels specified, that range binary numbers available from 0000 0000 1111 1111 hexadecimal notation), equivalent decimal numbers being 255, inclusive. case 4:2:2 systems described this Recommendation, levels reserved synchronization data, while levels available video. Given that luminance signal occupy only levels, provide working margins, that black level decimal value luminance signal, prior quantization,
corresponding level number after quantization nearest integer value.
Rec. ITU-R BT.601-5
Similarly, given that colour-difference signals occupy levels that zero level level 128, decimal values colour-difference signals, prior quantization are:
[0.713
and:
[0.564
which simplify following:
and:
corresponding level number, after quantization, nearest integer value. digital equivalents termed 3.5.4 Construction quantization
case where components derived directly from gamma pre-corrected component signals directly generated digital form, then quantization encoding shall equivalent
digital form) (219 digital form) (219 digital form) (219
Then:
taking nearest integer coefficients, base 256. obtain 4:2:2 components low-pass filtering subsampling must performed 4:4:4 signals described above. Note should taken that slight differences could exist between components derived this those derived analogue filtering prior sampling. 3.5.5 Limiting signals
Digital coding form signals represent substantially greater gamut signal values than supported corresponding ranges signals. Because this possible, result electronic picture generation signal processing, produce signals which, although valid individually, would result out-ofrange values when converted both more convenient more effective prevent this applying limiting signals than wait until signals form. Also, limiting applied that maintains luminance values, minimizing subjective impairment sacrificing only saturation.
Rec. ITU-R BT.601-5
family members
following family members defined Part 4:2:2, 13.5 aspect ratio, wide-screen 16:9 aspect ratio systems when necessary keep same analogue signal bandwidth digital rates both aspect ratios. 4:4:4, 13.5 16:9 aspect ratio systems with higher colour resolution.
family members
following family members defined Part 4:2:2, MHz, 16:9 aspect ratio systems with higher horizontal resolution compared with systems sampled 13.5 MHz. 4:4:4, 16:9 aspect ratio systems with higher colour resolution.
NOTE 4:4:4 members family sampled signals luminance colour difference signals (or, used, red, green blue signals).
ANNEX
Some guidance practical implementation filters specified Appendix Part Appendix Part
proposals filters used encoding decoding processes, been assumed that, post-filters which follow digital-to-analogue conversion, correction (sin characteristic provided. passband tolerances filter plus (sin corrector plus theoretical (sin characteristic should same given filters alone. This most easily achieved design process, filter, (sin corrector delay equalizer treated single unit. total delays filtering encoding luminance colour-difference components should same. delay colour-difference filter (Figs. 4b)) double that luminance filter (Figs. 3b)). difficult equalize these delays using analogue delay networks without exceeding passband tolerances, recommended that bulk delay differences integral multiples sampling period) should equalized digital domain. correcting remainder, should noted that sample-and-hold circuit decoder introduces flat delay half sampling period. passband tolerances amplitude ripple group delay recognized very tight. Present studies indicate that necessary that significant number coding decoding operations cascade carried without sacrifice potentially high quality 4:2:2 coding standard. limitations performance currently available measuring equipment, manufacturers have difficulty economically verifying compliance with tolerances individual filters production basis. Nevertheless, possible design filters that specified characteristics practice, manufacturers required make every effort production environment align each filter meet given templates. specifications given Appendix Part Appendix Part were devised preserve possible spectral content signals throughout component signal chain. recognized, however, that colour-difference spectral characteristic must shaped slow roll-off filter inserted picture monitors, component signal chain.
Rec. ITU-R BT.601-5 PART ANNEX
13.5 members family
Encoding parameter values 4:2:2, 13.5 member family
specification (see Table applies 4:2:2 member family, used standard digital interface between main digital studio equipment international programme exchange aspect ratio digital television wide-screen 16:9 aspect ratio digital television when necessary keep same analogue signal bandwidth digital rates.
TABLE
Parameters Coded signals: Number samples total line: luminance signal each colour-difference signal (CR, Sampling structure Sampling frequency: luminance signal each colour-difference signal
525-line, field/s systems
625-line, field/s systems
These signals obtained from gamma pre-corrected signals, namely: (see 3.5)
Orthogonal, line, field frame repetitive. samples co-sited with (1st, 3rd, 5th, etc.) samples each line 13.5 6.75 tolerance sampling frequencies should coincide with tolerance line frequency relevant colour television standard Uniformly quantized PCM, (optionally bits sample, luminance signal each colour-difference signal
Form coding Number samples digital active line: luminance signal each colour-difference signal Analogue-to-digital horizontal timing relationship: from digital active line Correspondence between video signal levels quantization levels: scale luminance signal
luminance clock periods (See 3.4) (Values decimal)
luminance clock periods
each colour-difference signal Code-word usage
quantization levels with black level corresponding level peak white level corresponding level 235. signal level occasionally excurse beyond level quantization levels centre part quantization scale with zero signal corresponding level Code words corresponding quantization levels used exclusively synchronization. Levels available video
Rec. ITU-R BT.601-5
Encoding parameter values 4:4:4, 13.5 member family
specifications given Table apply 4:4:4 member family suitable television source equipment high-quality video signal processing applications.
TABLE
Parameters Coded signals: Number samples total line each signal Sampling structure
525-line, field/s systems
625-line, field/s systems
These signals obtained from gamma pre-corrected signals, namely:
Orthogonal, line, field frame repetitive. three sampling structures coincident coincident also with luminance sampling structure 4:2:2 member 13.5 Uniformly quantized PCM, (optionally bits sample (See 3.4) (Values decimal)
Sampling frequency each signal Form coding Duration digital active line expressed number samples Correspondence between video signal levels most significant bits (MSB) quantization level each sample: scale luminance signal
each colour-difference signal
quantization levels with black level corresponding level peak white level corresponding level 235. signal level occasionally excurse beyond level quantization levels centre part quantization scale with zero signal corresponding level
used.
APPENDIX PART
Definition signals used digital coding standards
Relationship digital active line analogue sync reference
relationship between digital active line luminance samples analogue synchronizing reference shown Fig. 625-line 13.5 (see Table Fig. 525-line 13.5 (see Table
figures, sampling point occurs commencement each block. respective numbers colour-difference samples obtained dividing number luminance samples two. (12,132), (16,122) were chosen symmetrically dispose digital active line about permitted variations. They form part digital line specification relate only analogue interface.
Rec. ITU-R BT.601-5
FIGURE
16:9 13.5 Analogue line Analogue line
Digital line Digital blanking Luminance samples 4:2:2, chromo samples 4:2:2, chromo samples
Digital line
luminance sampling period
FIGURE
16:9 13.5 Analogue line Analogue line
Digital line Digital blanking Luminance samples 4:2:2, chromo samples 4:2:2, chromo samples
Digital line
luminance sampling period
FIGURE 1.[D01] FIGURE 2.[D02]
Rec. ITU-R BT.601-5 APPENDIX PART
Filtering characteristics
IGURE Specification luminance signal filter used when sampling 13.5 5.75 13.5
requency (MHz) Templa inserti loss/frequency character istic 0.05
0.01 0.05
0.05 Frequency (MHz) 5.75 Passband ripple tole rance
Frequency (MHz) Passband group-delay tole rance Note lowest indicated values instead MHz).
5.75
IFIGURE 3.[D02] PAGE PLEINE
Rec. ITU-R BT.601-5
FIGURE Specification colour-difference signal filter used when samplng 6.75 2.75 3.375 6.75
Frequency MHz) Template insertion loss/frequency chara cteristic 0.05 0.05 equency (MHz) 2.75 0.02
Passband ipple tolera
2.75 loss frequency Frequency
Passband group-delay tole rance lowest indicated values (instea MHz).
FIGURE 4.[D03] PAGE PLEINE
Rec. ITU-R BT.601-5
FIGURE Specification digital filter sampl ng-rate conversion from 4:4:4 4:2:2 colour-difference signals Note 2.75 3.375 Frequency (MHz) Templa insertion loss/f requency racteristic equency MHz) Passband ripple tolerance 2.75 6.25 6.75
Notes Figs. Note Ripple group dela specified relative their values kHz. full lines practical limits dashed lines give suggeste limits theoretical design. Note digital filter, practical design limits same. delay distortion zero, design. Note digital filter Fig. amplitude/frequency characte ristic linear scales) should skew-symmetr ical about half-amplitude point, which indicate figure. Note proposals filters used encoding decoding processe been ssumed that, post-filter which follow digital-to-analogue conversion, corr ection (sin x/x) characte ristic mple-and-hold circuits provide
FIGURE 5.[D04] PAGE PLEINE
Rec. ITU-R BT.601-5 PART ANNEX
members family
Encoding parameter values 4:2:2, member family
specification (see Table applies 4:2:2 member family used standard digital interface between main digital studio equipment international programme exchange 16:9 aspect ratio television with higher horizontal resolution compared with 16:9 systems sampled 13.5 MHz.
TABLE
Parameters Coded signals: Number samples total line: luminance signal each colour-difference signal (CR, Sampling structure Sampling frequency: luminance signal each colour-difference signal
525-line, field/s systems
625-line, field/s systems
These signals obtained from gamma pre-corrected signals, namely: (see Annex 3.5) 1144 1152
Orthogonal, line, field frame repetitive. samples co-sited with (1st, 3rd, 5th, etc.) samples each line tolerance sampling frequencies should coincide with tolerance line frequency relevant colour television standard Uniformly quantized PCM, (optionally bits sample, luminance signal each colour-difference signal
Form coding Number samples digital active line: luminance signal each colour-difference signal Analogue-to-digital horizontal timing relationship: from digital active line Correspondence between video signal levels quantization levels: scale luminance signal
determined (see Appendix Part (See 3.4) (Values decimal) quantization levels with black level corresponding level peak white level corresponding level 235. signal level occasionally excurse beyond level quantization levels centre part quantization scale with zero signal corresponding level Code words corresponding quantization levels used exclusively synchronization. Levels available video
each colour-difference signal Code-word usage
Rec. ITU-R BT.601-5
Encoding parameter values 4:4:4, member family
specifications given Table apply 4:4:4 member family suitable television source equipment high-quality video signal processing applications.
TABLE
Parameters Coded signals: Number samples total line each signal Sampling structure
525-line, field/s systems
625-line, field/s systems
These signals obtained from gamma pre-corrected signals, namely: 1144 1152
Orthogonal, line, field frame repetitive. three sampling structures coincident coincident also with luminance sampling structure 4:2:2 member Uniformly quantized PCM, (optionally bits sample (See 3.4) (Values decimal)
Sampling frequency each signal Form coding Duration digital active line expressed number samples Correspondence between video signal levels most significant bits (MSB) quantization level each sample: scale
luminance signal
quantization levels with black level corresponding level peak white level corresponding level 235. signal level occasionally excurse beyond level quantization levels centre part quantization scale with zero signal corresponding level
each colour-difference signal
used.
APPENDIX PART
Definition signals used digital coding standards
Relationship digital active line analogue sync reference
Further study required specify absolute values these parameters, while ensuring consistent picture positioning geometry across different standards. practical application, correct relationship achieved when picture sync relationship analogue domain identical images converted from 13.5 sampled digital representations.
Rec. ITU-R BT.601-5 APPENDIX PART
Filtering characteristics
FIGURE ecification luminance signal filter used when sampling
7.67 10.67 Frequency (MHz)
Templ insertion loss/frequency characteristic
0.05
0.01 0.05
0.05
Frequency (MHz)
7.33 7.67
Passband ripple tolerance
Frequency (MHz) 7.67
Passband group-delay tolerance Note lowest indicated values (instead MHz).
Rec. ITU-R BT.601-5
FIGURE Specification ur-difference signal filter used when sampl
3.67 4.60 5.33
Frequency (MHz) Template insertion loss/frequency characteristic 0.05 0.05 3.67 0.02
Frequency (MHz) Passband ripple tolerance
3.67
loss frequency
Frequency (MHz) ssband group-delay tolerance
Note lowest indicated values (instead MHz).
FIGURE 7.[D06] PAGE PLEINE
Rec. ITU-R BT.601-5
FIGURE Specification digital ilter sampling-rate conversion from 4:4:4 4:2:2 colour-dif ference signals
Note 3.67 5.33 Freque (MHz) Template insertion loss/frequency characteristic 8.33
Frequency (MHz) Passband ripple tolerance 3.67
Notes Figs. Note Ripple group delay specified relative their values kHz. full lines practical limits dashed lines give suggested limits theoretical design. Note digital filter, practical design limits same. delay distortion zero, design. Note digital filter (Fig. amplitude/frequency characteristic linear scales) should skew-symmetrical about half-amplitude point, which indicated figure. Note proposals filters used encoding decoding processes, been assumed that, post-filters which follow digital-to-analogue conversion, correction (sin x/x) characteristic sample-and-hold circuits provided.
FIGURE 8.[D07] PAGE PLEINE
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Characteristics television systems
CHARACTERISTICS TELEVISION SYSTEMS (Question 1/11)
CCIR Report 624-4
Section 11A: Characteristics systems monochrome colour television
Report 624-4
(1974-1987-1982-1986-1990)
tables this document given information purposes contain details number different television systems time XVIIth Plenary Assembly CCIR, Duesseldorf, 1990.
Information results comparative laboratory tests carried various colour television systems period 1963-1966 broadcasting authorities, administrations industrial organizations, together with main parameter systems found Reports 407, XXIIth Plenary Assembly, Delhi, 1970
television systems listed Report employ aspect ratio picture display (width/height) 4/3, scanning sequence from left right from bottom interlace ratio 2/1, resulting picture (frame) frequency half field frequency. systems capable operating independently power supply frequency.
full report obtained from: International Radio Consultative Committee International Telecommunications Union Place Nations CH-1211 Geneva Switzerland Telephone: (011) 4122 5800
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RECOMMENDATIONS CCIR, 1990
(ALSO RESOLUTIONS OPINIONS) VOLUME PART BROADCASTING SERVICE (TELEVISION) CCIR
CCIR
International Radio Consultative Committee (CCIR) permanent organ International Telecommunication Union responsible under International Telecommunication Convention ".to study technical operating questions relating specifically radiocommunications without limit frequency range, issue recommendations them." (International Telecommunication Convention, Nairobi 1982, First Part, Chapter Art. 83).1 objectives CCIR particular: provide technical bases administrative radio conferences radiocommunication services efficient utilization radio-frequency spectrum geostationary-satellite orbit, bearing mind needs various radio services; recommend performance standards radio systems technical arrangements which assure their effective compatible interworking international telecommunications; collect, exchange, analyze disseminate technical information resulting from studies CCIR, other information available, development, planning operation radio systems, including necessary special measures required facilitate such information developing countries.
also Constitution ITU, Nice, 1989, Chapter Art.
CCIR International Radio Consultative Committee
Geneva, 1990
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RECOMMENDATIONS CCIR, 1990
Rec. RECOMMENDATION INTERFACES DIGITAL COMPONENT VIDEO SIGNALS 525-LINE 625-LINE TELEVISION SYSTEMS
CCIR
(1986)
CCIR, CONSIDERING that there clear advantages television broadcasting organizations programme producers digital studio standards which have greatest number significant parameter values common 525-line 625-line systems; that world-wide compatible digital approach will permit development equipment with many common features, permit operating economies facilitate international exchange programmes; that implement above objectives, agreement been reached fundamental encoding parameters digital television studios form Recommendation 601; that practical implementation Recommendation requires definition details interfaces data streams traversing them; that such interfaces should have maximum commonality between 525-line 625-line versions; that practical implementation Recommendation desirable that interfaces defined both serial parallel forms; that digital television signals produced these interfaces potential source interference other services, notice must taken Radio Regulations, UNANIMOUSLY RECOMMENDS that where interfaces required component-coded digital video signals television studios, interfaces data streams that will traverse them should accordance with following description, defining both bit-parallel bit-serial implementations.
Introduction
This Recommendation describes means interconnecting digital television equipment operating 525-line 625-line standards complying with encoding parameters defined Recommendation 601. Part describes signal format common both interfaces. Part describes particular characteristics bit-parallel interface. Part describes particular characteristics bit-serial interface.
PART COMMON SIGNAL FORMAT INTERFACES
General description interfaces
interfaces provide unidirectional interconnection between single source single destination. signal format common both parallel serial interfaces described below.
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RECOMMENDATIONS CCIR, 1990
Rec.
data signal form binary information coded 8-bit words. These signals are: video data; timing reference codes; ancillary data; identification codes.
CCIR
Video data
Coding characteristics
video data compliance with Recommendation 601, with field-blanking definition shown Table
TABLE Field interval definitions
V-digital field blanking Start Field Finish Start Finish F-digital field identification Field Field Line Line Line Line Line Line Line Line Line Line Line Line
Field
Note Signals change state synchronously with active video timing reference code beginning digital line. Note Definition line numbers found Report 624. Note that digital line number changes state prior shown Fig.
Video data format
data words hexadecimal notation) reserved data identification purposes consequently only possible words used express signal value. video data words conveyed Mwords/s multiplex following order:
etc.
where word sequence refers co-sited luminance colour-difference samples following word, corresponds next luminance sample.
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RECOMMENDATIONS CCIR, 1990
Rec.
CCIR
Timing relationship between video data analogue synchronizing waveform
2.3.
Line interval
digital active line begins words 525-line standard) words 625-line standard) after leading edge analogue line synchronization pulse, this time being specified between half-amplitude points. Figure shows timing relationship between video analogue line synchronization. Analogue line blinking
line (625) Nom. (525) (625) 63.5 (525)
(625) Nom. (525) (625) (525) Video data block 1448T
Multiplexed video data
Digital line blanking 288T (625) 276T (525)
Digital active line 1440T (625) Digital line 1728T (625) 1716T (525)
FIGURE Data format timing relationship with analogue video signal clock period nom. SAV: start active video timing reference code EAV: active video timing reference code
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RECOMMENDATIONS CCIR, 1990
Rec.
CCIR
2.3.2
Field interval
start digital field fixed position specified start digital line: digital field starts words 525-line systems) words 625-line systems) prior lines indicated Table
Video timing reference codes (SAV, EAV)
There timing reference codes, beginning each video data block (Start Active Video, SAV) each video data block (End Active Video, EAV) shown Fig. Each timing reference code consists four word sequence following format: (Values expressed hexadecimal notation. Codes reserved timing reference codes.) first three words fixed preamble. fourth word contains information defining field identification, state field blanking, state line blanking. assignment bits within timing reference code shown below Table
TABLE Video timing reference codes
Word (MSB) (MSB)
First
Second
Third
Fourth
during field during field
elsewhere during field blanking
protection bits (see Table III). MSB: most significant LSB: least significant
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RECOMMENDATIONS CCIR, 1990
Rec.
Table defines state bits.
CCIR
Bits have states dependent states bits shown Table III. receiver this arrangement permits one-bit errors corrected two-bit errors detected.
TABLE Protection bits
Function
Fixed
Ancillary data
Provision made ancillary data inserted synchronously into multiplex during blanking intervals rate Mwords/s. Such data conveyed more 7-bit words, each with additional parity (LSB) giving parity. Each ancillary data block, when used, should constructed shown Table from timing reference code data field.
Data words during blanking
data words occurring during digital blanking intervals that used timing reference code ancillary data filled with sequence etc. (values expressed hexadecimal notation) corresponding blanking level signals respectively, appropriately placed multiplexed data.
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RECOMMENDATIONS CCIR, 1990
Rec. TABLE Ancillary data block
code Word Data field
CCIR
Data words (00, excluded) Word count line number (Note Word Word
word parity
Data type (Note
Fixed pattern "Word count" specifies length data field lies range 1434. word specifies line number then contain binary equivalent line number word count assumed zero. ancillary data block(s) transmitted when time available during horizontal vertical blanking following timing reference signal.
Note precise location ancillary data blocks coding words require further study.
PART BIT-PARALLEL INTERFACE General description interface
bits digital code words that describe video signal transmitted parallel means eight conductor pairs, where each carries multiplexed stream bits same significance) each component signals, eight pairs also carry ancillary data that time-multiplexed into data stream during video blanking intervals. ninth pair provides synchronous clock 27MHz. signals interface transmitted using balanced conductor pairs. Cable lengths feet) without equalization feet) with appropriate equalization (see employed. interconnection employs twenty-five D-subminiature connector equipped with locking mechanism (see convenience, eight bits data word assigned names DATA DATA entire word designated DATA (0-7). DATA most significant bit. Video data transmitted form real time (unbuffered) blocks, each comprising active television line.
Data signal format
interface carries data form parallel data bits separate synchronous clock. Data coded form. recommended data format described Part
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RECOMMENDATIONS CCIR, 1990
Rec. Clock signal
CCIR
General
clock signal square wave where transition represents data transfer time. This signal following characteristics: Width: 18.5 Jitter: Less than from average period over field.
Clock-to-data timing relationship
positive transition clock signal shall occur midway between data transitions shown Fig.
Timing reference data clock
Data
Clock
FIGURE Clock-to-data timing source) Clock period (625): Clock period (525): Clock pulse width: Data timing sending end: 37ns 1728
37ns 1716
18.5 18.5
line frequency
Electrical characteristics interface
General
interface employs nine line drivers nine line receivers. Each line driver (source) balanced output corresponding line receiver (destination) balanced input (see Fig.
Although technology specified, line driver receiver must ECL-compatible, i.e. they must permit either drivers receivers. digital signal time intervals measured between half-amplitude points. CCIR International Radio Consultative Committee
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RECOMMENDATIONS CCIR, 1990
Rec.
Source Transmission line Destination
CCIR
Line driver
Line receiver
FIGURE Line driver line receiver interconnection
Logic convention
terminal line driver positive with respect terminal binary negative binary (see Fig.
Line driver characteristics (source) 4.3.1 4.3.2 4.3.3 4.3.4 Output impedance: maximum Common mode voltage: -1.29 (both terminals relative ground). Signal amplitude: peak-to-peak, measured across resistive load. Rise fall times: less than measured between amplitude points, with resistive load. difference between rise fall times must exceed
Line receiver characteristics 4.4.1 4.4.2 4.4.3 Input impedance: Maximum input signal: peak-to-peak. Minimum input signal: peak-to-peak.
However, line receiver must sense correctly binary data when random data signal produces conditions represented diagram Fig. data detection point.
4.4.4
Maximum common mode signal: comprising interference range (both terminals ground).
4.4.5 Differential delay: Data must correctly sensed when clock-to-data differential delay range between (see Fig.
Mechanical details connector
interface uses contact type subminiature connector specified Document 2110-1980, with contact assignment shown Table Connectors locked together one-piece slide lock cable connectors locking posts equipment connectors. Connectors employ contacts equipment connectors employ socket contacts. Shielding interconnecting cable connectors must employed (see Note). Note should noted that ninth eighteenth harmonics 13.5 sampling frequency (nominal value) specified Recommendation fall 121.5 aeronautical emergency channels. Appropriate precautions must therefore taken design operation interfaces ensure that interference caused these frequencies. Emission levels related equipment given CISPR Recommendation: "Information technology equipment limits interference measuring methods" Document CISPR/B (Central Office) Nevertheless, Radio Regulations prohibits harmful interference emergency frequencies. CCIR International Radio Consultative Committee
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RECOMMENDATIONS CCIR, 1990
Rec.
Tmin Tmin
CCIR
Vmin
Reference transition clock FIGURE Idealized diagram corresponding minimum input signal level
Tmin Vmin Note width window diagram, within which data must correctly detected comprises clock jitter, data timing (see 3.2), available differences delay between pairs cable.
TABLE Contact assignments
Contact Signal line Contact Signal line
Clock System ground Data (MSB) Data Data Data Data Data Data Data Spare Spare Cable shield
Clock System ground Data Data Data Data Data Data Data Data Spare Spare
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RECOMMENDATIONS CCIR, 1990
Rec.
CCIR
spare pairs connected contacts 11,24 12,25 reserved bits lower significance than those carried contacts 10,23.
Line receiver equalization
permit correct operation with longer interconnection links, line receiver incorporate equalization.
When equalization used, should conform nominal characteristics Fig. This characteristic permits operation with range cable lengths down zero. line receiver must satisfy maximum input signal condition
Relative gain (dB) Frequency (MHz) Luminance sampling frequency
FIGURE Line receiver equalization characteristic small signals
PART BIT-SERIAL INTERFACE General description interface
multiplexed data stream 8-bit words described Part transmitted over single channel bit-serial form. Prior transmission, additional coding takes place provide spectral shaping, word synchronization facilitate clock recovery.
Coding
8-bit data words encoded transmission into 9-bit words shown Table
some 8-bit data words alternative 9-bit transmission words exist, shown columns each 9-bit word being complement other. such cases, 9-bit word will selected alternately from columns each successive occasion that such 8-bit word conveyed. decoder, either word must converted corresponding 8-bit data word. CCIR International Radio Consultative Committee
Multiple clock frequency
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RECOMMENDATIONS CCIR, 1990
Rec. TABLE Encoding table
Input Output Input Output Input Output Input Output Input Output
CCIR
Input
Output
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RECOMMENDATIONS CCIR, 1990
Rec. Order transmission
least significant each 9-bit word shall transmitted first.
CCIR
Logic convention
signal conveyed form. voltage output terminal line driver shall increase transition from (positive logic).
Transmission medium
bit-serial data stream conveyed using either coaxial cable fibre optic bearer
Characteristics electrical interface
Line driver characteristics (source) 6.1.1 Output impedance
line driver unbalanced output with source impedance return loss least over frequency range MHz.
6.1.2
Signal impedance
peak-to-peak signal amplitude lies between measured across resistive load directly connected output terminals without transmission line.
6.1.3
offset
offset with reference amplitude point signal lies between +1.0V -1.0
6.1.4
Rise fall times
rise fall times, determined between amplitude points measured across resistive load connected directly output terminals, shall between 0.75 shall differ more than 0.40
6.1.5
Jitter
timing rising edges data signal shall within 0.10 average timing rising edges, determined over period line.
Line receiver characteristics (destination) 6.2.1 Terminating impedance
cable terminated with return loss least over frequency range MHz.
6.2.2
Receiver sensitivity
line receiver must sense correctly random binary data either when connected directly line driver operating extreme voltage limits permitted 6.1.2, when connected cable having loss loss characteristic Over range equalization adjustment required; beyond this range adjustment permitted.
6.2.3
Interference rejection
When connected directly line driver operating lower limit specified 6.1.2, line receiver must correctly sense binary data presence superimposed interfering signal following levels: d.c. Below kHz: MHz: Above MHz: peak-to-peak peak-to-peak peak-to-peak
CCIR International Radio Consultative Committee
Philips Semiconductors
RECOMMENDATIONS CCIR, 1990
Rec.
CCIR
Cables connectors
6.3.
Cable
recommended that cable chosen should meet relevant national standards electro-magnetic radiation.
Note should noted that ninth eighteenth harmonics 13.5 sampling frequency (nominal value) specified Recommendation fall 121.5 aeronautical emergency channels. Appropriate precautions must therefore taken design operation interfaces ensure that interference caused these frequencies. Emission levels related equipment given CISPR Recommendation: "Information technology equipment limits interference measuring methods" (Document CISPR/B (Central Office) 16). Nevertheless, Radio Regulations prohibits harmful interference emergency frequencies.
6.3.2
Characteristic impedance
cable used shall have nominal characteristic impedance
6.3.3
Connector characteristics
connector shall have mechanical characteristics conforming standard type (IEC Publication 169-8), electrical characteristics should permit used frequencies circuits.
Characteristics
defined.
CCIR International Radio Consultative Committee

RECOMMENDATION ITU-R BT.601-5 STUDIO ENCODING PARAMETERS DIGITAL TELEV

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