IEC 62070 pdf download Broadcast digital video tape recorders – Identification method for recording and/or reproduction error status
This International Standard specifies methods for indicating the record and/or reproductionerror status of broadcast-grade digital VTRs utilizing a Reed Solomon product error correctioncode. (This code is hereinafter referred to as RS.)
This standard also specifies methods of measuring the error rates in record andorreproduction modes to indicate the error status.
The following two indicators are specified herein:
Go/No go indicator (hereinafter GNGI) for operational use.Error rate indicator (hereinafter ERI) for maintenance use.
NOTE This standard may be applicable to other digital television equipment using an RS product error correctioncode.
The following normative documents contain provisions which，through reference in this text,constitute provisions of this International ‘Standard. For dated references，subsequentamendments to, or revisions of，any of these publications do not apply.However，parties toagreements based on this International Standard are encouraged to investigate the possibilityof applying the most recent editions of the normative documents indicated below. For undatedreferences, the latest edition of the normative document referred to applies. Members of lECand lso maintain registers of currently valid lnternational Standards.
IEC 60050(702):1992,International Electrotechnical Vocabulary (IEV) – Chapter 702: Oscilla-tions,signals and related devices
ITU-R Recommendation BT.601-5: Studio encoding parameters of digital television forstandard 4:3 and wide-screen 16:9 aspect ratios
3Terms and definitions
For the purpose of this International Standard, the following terms and definitions apply.
bit (binary digit)
a number of a set of two elements used to represent information
bit error rate
the error rate for a binary signal
unit which separates the information byte series into n bytes for adding error correction code
block error rate
error rate for a signal constructed from block units
an ordered set of eight binary digits
byte error rate
error rate for a signal constructed from byte units
method of error control in which the subjective effects of detected but uncorrected errors can be reduced
NOTE Error concealment may be effected, for example, by interpolation of adjacent error-free sample values.
ratio of the number of erroneous elements to the total number of elements reproduced and/or transmitted during a given time interval
NOTE The elements may be, for example, digits, code words or blocks.
ERI Error rate indicator
GNGI Go/No go indicator
4 Go/No go indicator (GNGI)
NOTE The GNGI is provided to assist the operation of the VTR.
4.1 Colour of the indicator
The GNGI shall consist of lights of three colours: red, yellow and green. More than one colour shall not light simultaneously.
4.2 Meaning of the colours
The meaning of the three colour indicators shall be as follows.