IEC 61834-8:2001 pdf free download

IEC 61834-8:2001 pdf free download Recording – Helical-scan digital video cassette recording system using 6,35 mm magnetic tape for consumer use (525-60, 625-50, 1125-60 and 1250-50 systems) Part 8: PALplus format for the 625-50 system
1 General
1.1Scope
This part of lEC 61834 is an extension of the SD specification (SD mode) and covers thefeatures necessary to enable a DVCR to record and reproduce PALplus signals.
While all DVCRs must have the capability of recording and/or playback in SD (SP)mode,PALplus capability is optional.
For this Part 8, the data structure of a track is defined by APT = 000b which consists of fourareas as described in 4.3.2 in lEC 61834-1 and AP1 = AP2 = AP3 = 000b.
There are two methods for recording the PALplus signal on a DVCR:
– method 1: record the partially encoded PALplus signal;
– method 2: record the completely decoded PALplus signal.
This part is concerned with “Method 1” (baseband helper recording) as this requires anextension to the DVCR SD specification IEC61834-2.
For “Method 2” the DVCR is equipped with a built-in PALplus decoder and the SD specificationlEC61834-2 applies unchanged.
1.2Normative references
The following normative documents contain provisions which，through reference in this text,constitute provisions of this part of lEC 61834.For dated references,subsequent amendmentsto,or revisions of，any of these publications do not apply. However，parties to agreementsbased on this part of iEC 61834 are encouraged to investigate the possibility of applying themost recent editions of the normative documents indicated below.For undated references,thelatest edition of the normative document referred to applies. Members of lEC and IS0 maintainregisters of currently valid lnternational Standards.
IEC 61834-1:1998,Recording – Helical-scan digital video cassette recording system using6,35 mm magnetic tape for consumer use (525-60，625-50,1125-60 and 1250-50 systems)-Part 1: General specifications
IEC 61834-2:1998,Recording – Helical-scan digital video cassette recording system using6,35 mm magnetic tape for consumer use (525-60，625-50,1125-60 and 1250-50 systems) -Part 2: sD format for 525-60 and 625-50 systems
1.4 Test conditions and environment
Same as IEC 61 834-2.
2 Helical recordings
Same as 625-50 system in IEC 61 834-2.
3 Programme track data arrangement
Same as 625-50 system in IEC 61 834-2.
4 Audio interface
Same as IEC 61 834-2.
5 Video interface
The principal mode of interface is analogue. The analogue video signal shall be converted according to 7.4.1 in IEC 61 834-2.
The video signal may also be input and output digitally in a bit-serial form. When the bit-serial interface for this standard is prepared, the data structure for transmission shall conform to clause 1 1 .
For details of the standard digital interface, refer to IEC 61 883-1 and IEC 61 883-2.
6 Audio signal processing
Same as 625-50 system in IEC 61 834-2.
7 Video signal processing
7.1 Introduction
The helper signals are demodulated. After certain processing, they are treated in the Y channel. The WSS signalling bits are rewritten and stored in the VAUX TR pack. The WHITE LEVEL REFERENCE is also written in the VAUX TR pack.