ST92195D datasheet(167/249 Pages) STMICROELECTRONICS

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ST92195C/D - VPS & WSS SLICER

VPS & WSS SLICER (Cont’d)

7.8.3 About Video Programming System (VPS)

The VPS extracts the digital data from line 16 of a

transmitted PAL video signal. The VPS feature for

the VCR uses only 5 of the 13 bytes of information

to help simplify the programming of the VCR for re-

cording.

A total of 15 words is transmitted on field 1, line 16.

The signal is bi-phase modulated at a 2.5Mbit/s

rate. The VPS transmission specification defines

the clock frequency is 5MHz (+/-.01%), the signal

shape is sine squared pulses with half amplitude

pulse duration equal to 200ns +/- 10ns, and the

signal amplitude is 0.5V +/- 5%.

The first word starts 12.5 +/- 1.5 sync pulse. The

words (bytes) of data are recalled below:

Word 1: Run-in (10.10.10.10.10.10.10.10)

The run-in word is a group of all 1's. With the bi-

phase coding the signal is 1010101010101010

that is used for clock synchronisation inside the

VPS cell.

Word 2: Start code (10.00.10.10.10.01.10.01)

The start code helps to define the presence of

VPS and to synchronize the following data stream.

If the start code has not been recognised 12.7 +/-

0.2 the VPSWin rising edge, the system waits for

the next VPSWin to find a Start code.

Words 3 and 4 are not relevant for the VPS coding.

Word 5: Identification of sound channels and “Rat-

ed R” mark

Words 6 through 10 are not relevant for VPS coding.

Words 11 through 14 contain 32 bits. Complete in-

formation may involve bits contained in two bytes.

These bits are numbered from 0 to 31 in the VPS

transmission spec to show the order in reverse time

that the bits are actually transmitted. This means the

MSB is the first bit following the framing code for any

one grouping of information. The bit numbers are in-

cluded below to help cross-reference the bits with

the VPS transmission specification.

Word 15 is not relevant for VPS coding and is not

defined in the VPS specification.

ID of address Announced Day of Transmission (6 bits) (binary)

Announced Month of Transmission (4 bits) Announced Start Hour (5 bits) binary

Announced Start Minute (6 bits) Nationality (4 bits) (binary)

Nationality (4 bits) Program Source Code (6 bits)

VPS Bit #

------

Word 5

543210

Sound

R-rating

reserve

VPS01

SD(1)

SD(0)

RR(1)

RR(0)

RX(3)

RX(2)

RX(1)

RX(0)

Sound Bits

R-Rating Bits

Reserved Bits for future application

VPS Bit #

Word 11

Day

Month

VPS02

ID(1)

ID(0)

ADT(4)

ADT(3)

ADT(2)

ADT(1)

ADT(0)

AMT(3)

VPS Bit #

Word 12

76543

Month

Hour

VPS03

AMT(2)

AMT(1)

AMT(0)

ASH(4)

ASH(3)

ASH(2)

ASH(1)

ASH (0)

VPS Bit #

Word 13

Minute

Nation

VPS04

ASM(5)

ASM(4)

ASM(3)

ASM(2)

ASM(1)

ASM(0)

NC (3)

NC (2)

VPS Bit #

262728293031

Word 14

543210

Nation

Source

VPS05

NC (1)

NC (0)

PSC(5)

PSC(4)

PSC(3)

PSC(2)

PSC(1)

PSC(0)

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