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Основы телевидения

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Rec. ITU-R BT.709-6

Signal format

Item

Parameter

System Values

3.1

Conceptual non-linear pre-correction

0.45

of primary signals

(see item 1.2)

3.2

Derivation of luminance signal E

0.2126

0.0722

R 0.7152 E

3.3

Derivation of colour-difference

ECB

EB EY

signal (analogue coding)

1.8556

0.2126 ER 0.7152 EG 0.9278 EB

1.8556

ECR

ER EY

1.5748

0.7874 ER 0.7152 EG 0.0722 EB

1.5748

3.4

Quantization of RGB, luminance and

2n 8

INT 219 E

colour-difference signals(1), (2)

INT

2n 8

219 E

2n 8

INT

219 E

2n 8

INT

219 E

INT

224 E

128

2n 8

INT

224 E

128

2n 8

3.5

Derivation of luminance and colour-

difference signals via quantized RGB

INT 0.2126DR

0.7152DG

0.0722DB

signals

0.2126

0.7152

0.9278

224

n 1

INT

1.8556

219

0.7874

0.7152

0.0722

224

n 1

INT

1.5748 G

1.5748 B

1.5748

219

(1)“n” denotes the number of the bit length of the quantized signal.

(2)The operator INT returns the value of 0 for fractional parts in the range of 0 to 0.4999... and +1 for fractional parts in the range of 0.5 to 0.9999..., i.e. it rounds up fractions above 0.5.

			Rec. ITU-R BT.709-6		5
4	Digital representation

Item		Parameter			System Values

4.1	Coded signal				R, G, B or Y, CB, CR

4.2	Sampling lattice			Orthogonal, line and picture repetitive
	– R, G, B, Y

4.3	Sampling lattice			Orthogonal, line and picture repetitive co-sited with each other
	– CB, CR			and with alternate(1) Y samples
4.4	Number of active samples per line
	– R, G, B, Y				1 920
	– CB, CR				960

4.5	Coding format			Linear 8 or 10 bits/component

4.6	Quantization levels			8-bit coding		10-bit coding
	–	Black level
	–	Black level
		R, G, B, Y		16		64
	–	Achromatic
		CB, CR		128		512
	–	Nominal peak
		– R, G, B, Y		235		940
		– CB, CR		16 and 240		64 and 960

4.7	Quantization level assignment			8-bit coding		10-bit coding

	–	Video data		1 through 254		4 through 1 019
	–	Timing reference		0 and 255		0-3 and 1 020-1 023

4.8	Filter characteristics(2)
	– R, G, B, Y				See Attachment 1
	–	CB, CR

(1)The first active colour-difference samples being co-sited with the first active luminance sample.

(2)These filter templates are defined as guidelines.

6	Rec. ITU-R BT.709-6

Picture scanning characteristics

System Values

Item

Parameter

60/P

30/P

30/PsF

60/I

50/P

25/P

25/PsF

50/I

24/P

24/PsF

5.1

Order of sample presentation

Left to right, top to bottom

in a scanned system

For interlace and segmented frame systems, 1st active line of field 1 at top of picture

5.2

Total number of lines

1 125

5.3

Field/frame/segment frequency (Hz)

60,

30,

60, 60/1.001

24,

48,

60/1.001

30/1.001

24/1.001

48/1.001

5.4

Interlace ratio

1:1

2:1

1:1

2:1

1:1

5.5

Picture rate (Hz)

60, 60/1.001

30, 30/1.001

24, 24/1.001

5.6

Samples per full line

– R, G, B, Y

2 200

2 640

2 750

– CB, CR

1 100

1 320

1 375

5.7

Nominal analogue signal

bandwidths(1) (MHz)

5.8

Sampling frequency

148.5,

74.25, 74.25/1.001

148.5

74.25

74.25, 74.25/1.001

–

R, G, B, Y (MHz)

148.5/1.001

5.9

Sampling frequency(2)

74.25,

37.125, 37.125/1.001

74.25

37.125

37.125, 37.125/1.001

–

CB, CR (MHz)

74.25/1.001

(1)Bandwidth is for all components.

(2)CB, CR sampling frequency is half of luminance sampling frequency.

Rec. ITU-R BT.709-6

6 Analogue tri level sync signal

The tri level sync signal may be used as a reference signal for synchronization of devices operating on this Recommendation.

System Values

Item

Parameter

60/P

30/P

30/PsF

60/I

50/P

25/P

25/PsF

50/I

24/P

24/PsF

6.1

Nominal level

(mV)

Reference black: 0

, E , E , E

Reference white: 700

(see Fig. 2B)

6.2

Nominal level

(mV)

350

, E

(see Fig. 2B)

6.3

Form of synchronizing

Tri-level bipolar

signal

(see Fig. 2A)

6.4

Line sync timing

reference

(see Fig. 2A)

6.5

Sync level

(mV)

300 2%

6.6

Sync signal timing

Sync on all components

(see Table 1, Figs 1 and 2)

6.7

Blanking interval

(see Table 1, Figs 1 and 2)

Rec. ITU-R BT.709-6

TABLE 1

Level and line timing specification

(See Figs 1 and 2)

System Values

Symbol

Parameter

60/P

30/P

30/PsF

60/I

50/P

25/P

25/PsF

50/I

24/P

24/PsF

Reference clock interval ( s)

1/148.5,

1/74.25, 1.001/74.25

1/148.5

1/74.25

1/74.25, 1.001/74.25

1.001/148.5

Negative line sync width(1)

(T)

44 3

End of active video(2) (T)

88 + 6

528 + 6

638 + 6

– 0

Positive line sync width (T)

44 3

Clamp period (T)

132 3

Start of active video

(T)

192 + 6

– 0

Rise/fall time (T)

4 1.5

–

Active line interval

(T)

1 920 + 0

– 12

Amplitude of negative pulse (mV)

300 6

Amplitude of positive pulse

(mV)

300 6

Amplitude of video signal

(mV)

700

Total line interval

(T)

2 200

2 640

2 750

Half line interval

(T)

1 100

1 320

1 375

Vertical sync width

(T)

1 980 3

880 3

1 980 3

880 3

1 980 3

880 3

End of vertical sync pulse

(T)

88 3

528 3

308 3

638 3

363 3

(1)“T ” denotes the duration of a reference clock or the reciprocal of the clock frequency.

(2)A “line” starts at line sync timing reference OH (inclusive), and ends just before the subsequent OH (exclusive).

First field/segment sync timing reference

45 H

5 H

Progressive

No. 1121

No. 1125

No. 1

No. 2

No. 3

No. 4

No. 5

No. 6

No. 7

No. 42

F irst field/segment

22 H

6-709.BT R-ITU .Rec

Progressive

5 H

1A FIGURE

first segment

Interlace

first field

No. 1123

No. 1124 No. 1125

No. 1

No. 2

No. 3

No. 4

No. 5

No. 6

No. 7

No. 21

synchronizingField/frame/segmentsignal

F irst field/segment

waveform

23 H

Progressive

1/2 H

5 H

1/2 H

second segment

Interlace

sec ond field

No. 560

No. 561

No. 562

No. 563

No. 564

No. 565

No. 566

No. 567

No. 568

No. 569

No. 584

BT.0709-01A

10	Rec. ITU-R BT.709-6

FIGURE 1B

Detail of field/frame/segment synchronizing signal waveform

	H
	O
k	k
f	f

			f
		f		d
h	line	f	c	1 line
	1
			a
			f
				k
			f

h g

f	f
d	d

BT.070901B

H	H
O	O

Progressive

Progressive segment

Interlace field

Rec. ITU-R BT.709-6

FIGURE 2A

Line synchronizing signal waveform

	f	f	f
V/2		p	/2	V/2
		S	p
		S	S
m	/2
m	m
S	S
		a	c
	b		d
			e
		OH
		90%
		Tr
		10%
			f
	(The waveform exhibits symmetry with respect to point Tr			)
				BT.0709-02A

12	Rec. ITU-R BT.709-6

FIGURE 2B

Sync level on component signals

	mV	ER, EG, EB, EY
	+700	ER, EG, EB, EY
	+700
	+300
	0
	–300
		ECB, E CR
	+350
	+300
	0
	–300
	–350
		Blanking interval
		OH
		BT.0709-02B

Rec. ITU-R BT.709-6

Attachment 1

(Informative)

Filter templates

Figures in this Attachment are suggested filter templates intended to remove alias components.

FIGURE A1-1

Guideline filter characteristics for R, G, B and Y signals (informative)

		50							50 dB
		50
		40					40 dB
		40
	(dB)	30
	loss	30
	loss
	Insertion	20
	Insertion				12 dB
		10
		0		0.40	0.50	0.60	0.73		1.00
		0		0.40	0.50	0.60	0.73		1.00
					Frequency (times fs)
		a) Template for insertion loss
loss (dB)		0.05
loss (dB)		0			0.1 dB
Insertion		0			0.1 dB
	– 0.05

		0		0.40
			Frequency (times fs)
		b)	Passband ripple tolerance
		0.110
(T)		0.075
delay		0					0.15 T	0.22 T
Group	– 0.075
Group
	– 0.110
		0	0.27	0.40
			Frequency (times fs)
		c) Passband group-delay
									BT.0709-A1-01

Note 1 – ƒs denotes luminance sampling frequency, the value of which is given in item 5.7. Note 2 – Ripple and group delay are specified relative to the value at 100 kHz.

14	Rec. ITU-R BT.709-6

FIGURE A1-2

Guideline filter characteristics for CB and CR signals (informative)

		50							50 dB
		50
							40 dB
		40
	(dB)	30
	loss	30
	loss
	Insertion	20
	Insertion
		10			6 dB
					6 dB
		0		0.20	0.25	0.30	0.37		0.50
		0		0.20	0.25	0.30	0.37		0.50
					Frequency (times fs)
		a) Template for insertion loss
loss (dB)		0.05
loss (dB)		0			0.1 dB
Insertion		0			0.1 dB
	– 0.05

		0		0.20
			Frequency (times fs)
		b)	Passband ripple tolerance
		0.110
(T)		0.075
de lay		0					0.15 T	0.22 T
Group	– 0.075
Group
	– 0.110
		0	0.14	0.20
			Frequency (times fs)
		c) Passband group-delay
									BT.0709-A1-02

Note 1 – ƒs denotes luminance sampling frequency, the value of which is given in item 5.8. Note 2 – Ripple and group delay are specified relative to the value at 100 kHz.

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Signal format

Digital representation

Picture scanning characteristics

6 Analogue tri level sync signal