Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. इंटरनेट मानक “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda “Invent a New India Using Knowledge” “प0रा1 को छोड न’ 5 तरफ” Jawaharlal Nehru “Step Out From the Old to the New” “जान1 का अ+धकार, जी1 का अ+धकार” Mazdoor Kisan Shakti Sangathan “The Right to Information, The Right to Live” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 11453 (1985): Characteristics of systems for monochrome and colour television [LITD 7: Audio, Video and Multimedia Systems and Equipment]
Transcript
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 11453 (1985): Characteristics of systems for monochromeand colour television [LITD 7: Audio, Video and MultimediaSystems and Equipment]
UDC 621.397.121/.122
Indian Standard
IS:11453-1985
CHARACTERISTICS OF SYSTEMS FOR MONOCHROME AND COLOUR TELEVISION
1. scope - in India.
Covers the characteristics of the systems for monochrome and colour television adopte
2. Transmission
2.1 For television broadcast in India, 625 line system having negative picture modulation wit1 associated frequency modulation sound reception on the intercarrier sound system corresponding tl the standard system B of International Radio Consultative Committee (CCIR) has been adopted. II respect of colour the PAL ‘B’ system with a colour sub-carrier of 4’43 MHz has been adopted.
2.1 .I For details of the system, see Appendix A.
3. Channels
3.1 The television receivers shall be designed for reception in one or more of the following channels:
a) VHF Range
Band Channel Frequency Range
I 2 47to 54MHz
3 54 to 61 MHz
4 61 to 68 MHz
5 ‘174 to 181 MHz
6 181 to ‘188 MHz
7 188 to 195 MHz
III 8 195 to 202 MHz
9 202 to 209 MHz
IO 209 to 216 MHz
11 216 to 223 MHz
12 223 to 230 MHz
b) UHF Range - Under consideration.
APPENDIX A
( Clause 21.1 )
CHARACTERISTICS OF SYSTEM FOR MONOCHROME AND COLOUR TELEVISION ADOPTED IN INDIA (SYSTEM B OF CCIR)
4-O. The details of the broadcast system for monochrome and colour television adopted in India are n accordance with the CCIR Standard System B as given below:
\-I. Basic Characteristics of Video and Synchronizing Signals
Number of lines per picture (frame) 625
Field frequency, nominal value ( fields/second ) 50
Adopted 20 August 1985 0 May 1987, BIS Gr 4
BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
I
Line frequency f” and tolerance when
operated non-synchronously ( Hz)
Maximum variation rate of line frequency valid for monochrome transmission ( percent/s )
Nominal levels of the composite video signal ( see Fig. 1 ) ( percent)
‘Blanking level’( reference level)
Peak-white-level
Synchronizing level
piffcrence between black and blanking ievel
Assumed gamma of display device for which pre-correction of monochrome signal is made
Nominal video bandwidth ( MHz)
Aspect ratio (width/height)
Scanning sequence ( line)
Scanning sequence (field )
Operation independent zf power supply frequency
fH = 15625 Tolerance = f 0’02 percent for mono-
chrome and f 0’000 1 percent for colour transmission
0’05
Note-These values are not valid when the reference of synchronism is being changed.
0
100
- 43
0
2’8 Note - Assumed value for overall gamma appro-
ximately 1.2. The gamma of the picture tube is defined as the slope of the curve giving the logarithm of the luminance reproduced as a function of the logarithm of the video signal voltage when the brightness control of the receiver is set so as to make this curve as straight as possible in a luminance range corresponding to a contrast of at least l/40.
5
413
Left to right
Top to bottom
Yes, capable
1
1. Blanking level 4. Difference between black
and blanking levels
2. Peak white-level 5. Peak-to-peak value of burst
3. Synchronizing level 6. Peak-to-peak value of colour sub-carrier
FIG. 1 LEVELS IN THE COMPOSITE SIGNAL AND DETAILS OF LINE-SYNCHRiNIZING SIGNALS
2
is:i14!.s-19th
A-2. Details of Line Synchroniiing Signals ( See Fig. 1 ) Durations ( Measured Between Half Amplitude Points on the Appropriate Edges ) for System
Nominal line period ( ILS) (H) 64
Line blanking interval (rs) (a) 12 f 0’3
Interval between time datum 10’5 (OH ) and back edge of line blanking (Average calculated value for information ) signal (us) (b)
Front porch (I‘S) ( c) 1’5 f 0’3
Synchronizing pulse ( PS ) ( d) 4’7 f 0’2
Build-up time (10 to 90 percent) of the 0’3 f 0’1 edges of the line-blanking signal ( PS) (e)
Build-up time ( 10 to 90 percent ) of the line-synchronizing pulses (ps) (fj
0’2 f 0’1
A-3. Details of Field Synchronizing kg&& ( See: Fig’. 2 ) Durations ( Measured Between Half Amplitude Points on the Appropriate Edges ) For System
Field period ( ms ) ( v )
Field-blanking period (for Hand a, see A-2) (i)
20
25H+a
Build-up time (IO to 90 percent) of the edg’es of field-blanking pulses (ps) (j) (not indicated in the diagram )
0’3 f 0’1
Duration of first sequence of equalizing pulses’( 1)
2’5 H
Duration of sequence of synchronizing pulses (m)
2’5 H
Duration of second sequence of equali- zing pulses (n)
2’5 ii
Duration of equalizing pulse (ps) (p)
Duration of field-synchronizing pulse (I1s) (a)
2’35 f 0’1
27’3 (r,ominal value)
lnterva I between field-synchronizing
pulses ( PS ) ( r)
4’7 i 0’2
Build-up time (IO to 90 percent) of synchronizing and equalizing pulses (W) (s)
0’2 f 0’1
A-4. Characteristics of the Video Sign& for Colour Television
X Y Assumed chromaticity coordinates for Red 0’64 0’33
primary colours of receiver Gre’en q:29 0’60 Blue 0’15 0’06
Chromaticity coordinates for equal primary signals E’R = f ‘e = f ‘B
Assumed gamma value of the receiver for which the primary signals are or& corrected
Note --T”he primary signets are pre+ofrec,ted,so that th.e optimum quality is obtained with a display having the indicated value of gamma.
Attenuation of colour Eu <3 dB at 1’3 MHz differerxe signals E’” > 20 dB at 4 MHz
Equation of composite colour signal EM= EfY + Efu sin 2rf.d f E’v cos 2rfSct
where
E’ see luminance signal
Efu and E’” see chrominance signals
A A A A A A A A A
SECOND FIELD FIRST FIELD See FIG. 2C
2A Signal at beginning of each first field
FIRST FIELD
See FIG. 2 C
SECOND FIELD
2B Signal at beginning of each second field
BLANKING ------LEVEL
SYNC. -----LEVEL
(The durations are measured to the half-amplitude points on the appropriate edges.)
2C Details of Equalizing and Synchronizing Pulses
Note 1 - A A A indicates an unbroken sequence of edges of line-synchronizing pulses throughout the field- blanking period.
Note 2 - At the beginning of the each first field, the edge of the field-synchronizing pulse, OV, coincides with the edge of a line-synchronizing pulse if I is an odd number of half-line periods as shown.
Note 3 - At the beginning of each second field, the edge of the field-synchronizing pulse, OV, falls midway between the edges of two line-synchronizing pulses if I is an odd number of half-line periods as shown.
FIG. 2 DETAILS OF FIELD-SYNCHRONIZING WAVEFORMS
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IS : 11453 - 4985
fsc’ see item chrominance sub-carrier frequency. The sign of the E’v compo- nent is the same as that of the sub- carrier burst ( changing for each line) (see phase of chrominance sub-carrier burst and Fig. 3 ).
) 0,877 (E’R-E; I= E;
\ \
\ \
\ \
0 493 ( c
/
Ei 1 = E’”
A = phase of the burst in odd lines of the first, second, fifth and sixth fields and in even lines of the third, , fourth, seventh and eighth fields.
B = phase of the burst in even lines of the first, second, fifth and sixth fields and in odd lines of the third, fourth, seventh and eighth fields.
FIG. 3 CHROMINANCE AXES AND PHASE OF THE BURST
Type of chrominance sub-carrier modu- lation
Chrominance sub-carrier frequency
a) nominal value and tolerance (Hz)
b) relationship between chrominance sub-carrier frequency fssc and line frequency fii
Bandwidth of chrominance sidebands I ;rrrd;ature modulation of sub-carrier)
Amplitude of chrominance sub-carrier
Synchronization of chrominance carrier (see Fig. 1 )
Start of sub-carrier burst ( PS) ( 9)
sub-
Duration of sub-carrier burst (ps) (h)
Suppressed-carrier amplitude-modulation of two sub-carriers in quadrature
4 433 618’75 f 5
f = 1135’ SC
( ,_+&JfH
fsc + 570 - 1 300
G=d~y +E’+
Note - During transmission of a monochrome programme of significant duration, in order to ensure satisfactory operation of colour-killers in receivers, all signals having the same nominal fre- quency as the colour sub-carrier that appears in the line-blanking interval, should be attenuated by at least 35 dB below the peak-to-peak value of chrominance sub-carrier burst shown as item 5 in Fig. 1.
Sub-carrier burst on blanking back porch
5’6 f 0’1 after epoch OH Note -Transmitter pre-correction for receiver
group delay is not included.
2’25 f 0’23 (10 f 1 cycles )
5
18:11453-1985
Peak-to-peak value of chrominance sub- 3/7 of carrier burst (see Fig. 1 ) and
Note - For the use of automatic gain control circuits, it is important that the burst amplitude should maintain the correct ratio with the chro- minance signal amplitude.
difference between blanking level peak white-level &IO percent (see under amplitude of chrominance sub- Note
carrier ).
Phase of chrominance sub-carrier burst 135” relative to E’” axis with the following sign
(see Fig. 1 ) (see Fig. 3 )
Field Number (see Note)
1 2 3 4 5 6 7 8
Line Burst blanking sequence (see Fig. 5) ,
I II III IV I II III IV
even - -++--++ odd + + - - + + - -
Note - Field 1 of the sequence of eight colour fields is defined as that field, where the phase # E’u of the extrapolated E’u component [see chromi- nance signals(colour difference)] of the video burst at the hall amplitude point of the leading edge of the line synchronizing pulse of line 1 is in the range -go0 < E’u < 90”.
Blanking of chrominance sub-carrier 9 lines of the field blanking interval:
lines 311 to 319 inclusive
623 to 6 inclusive
310 to 318 inclusive
622 to 5 inclusive
(See Fig. 4)
YY A a
I IV 2 t i
uuu l..u I 300 I 309 I 310 1 311 ( 312 1 313 I 314 I 315 I 316 I 317 I 318 1 319 1 320 1
*f: i
uuuuuu lli u I 621 I 622 1 623 I 624 1 625 1 1 I 2 I 3 I 4 I 51617\
I ' I
I 11
I 308 I 309 1 3:0 uuuuuuuulJuuuu
' 311 1 312 1 313 I 314 I 315 I 316 I 317 I 318 1 319 1 320 I
IV J
0~ = field-synchronizing datum A = phase of burst; I, II, ///, IV = first and fifth, second and sixth, nominal value j-135”
third, and seventh, fourth and B = phase of burst; eighth fields nominal value -135”
C = burst-blanking intervals
FIG. 4 BURST-BLANKING SEQUENCE
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I$:11453-1985
A-5. Characteristics of the Radiated Signals ( Monochrome and Colour )
