IEC 62375 pdf download

IEC 62375 pdf download Video systems (625/50 progressive) – Video and accompanied data using the vertical blanking interval – Analogue interface
1Scope
This International Standard specifies the method of transfer of aspect ratio information code,copy control information code and other codes in the vertical blanking interval of theluminance signal.
This International Standard is applicable to the transfer of video related information with thevideo signal through the baseband analogue signal of 625-line/50-frame progressive scanvideo system between digital and analogue video equipments.
2Normative references
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
ITU-R BT.1358:Studio parameters of 625 and 525 line progressive scan television systems
3Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
letterbox
picture display format to display a picture with an aspect ratio greater than the screen, in sucha way that empty (black) lines are added to conform to the screen
3.1.2
full format
picture display format with full screen size conforming to its scanning format
3.1.3
cGMs-A
copy generation management system on analogue video interface, for use in digital videorecorders and digital video equipments
4 Defined signal
The signal defined in this standard is defined for use with systems complying with ITU-R BT.1 358.
5 Construction of identification signal
5.1 Position
The identification signal bits shall be transmitted as a data burst in the first part of line 43.
The position of the beginning of the bits shall be 5,5 µs ± 0,1 25 µs from 0 h of the horizontal sync, as indicated in Figure 1 . This figure is intended to illustrate the position of the signalling bits in line 43. In each frame, line 43 shall be occupied with this identification signal.
5.2 Clock frequency
The clock frequency shall be:
F s = 1 0 MHz ± 1 kHz
The sampling period shall be:
T s = 1 00 ns
5.3 Signal amplitude
The signal amplitude with respect to maximum video signal amplitude of 700 mV shall be:
500 mV ± 25 mV
5.4 Modulation coding
Bi-phase coding shall be used in accordance with Figure 2.
Duration of one data bit: T d
6 Information content of data bits
The 1 3 data bits shall be grouped in 4 groups in accordance with Table 1 .
Group 1 shall contain 4 bits in which the first 3 bits carry data and the last bit shall denote the odd parity bit over the first three data bits. Group 2 shall contain 4 data bits, Group 3 shall contain 3 data bits and Group 4 shall contain 3 data bits.
The data bits shall be labelled b 0 up to and including b 2 combined with b 4 up to and including b 1 3 . b 3 shall be the odd parity bit as shown in Table 1 and 2. The index also indicates the order of transmission: b 0 shall be the first transmitted bit.
6.1 Data group 1 , Aspect ratio
b 0 , b 1 , b 2 : shall denote the aspect ratio label, the letterbox format and position according to Table 2.
b 3 :
shall denote the odd parity of b 0 , b 1 , b 2 , b 3 according to Table 2.