Tektronix SDA601 Manual do Utilizador descarregar pdf (Página 67)

Glossary

SDA 601 Serial Digital Analyzer User Manual

EDH flag

A digital “marker” inserted in the data stream to feed forward

information regarding detected errors. EDH flags are set by

many input/output devices to help identify faulty equipment in

the signal path. The flags defined in RP-165 are: error detected

here; error detected already; internal error detected here;

internal error detected already; and unknown error status.

EDH Group

An SDA 601 Watch group that contains:

G APCRC EDH errors

G FFCRC EDH errors

G EDH flags (set/not set)

The CRCs and flags are monitored. Flag status is reported, but

not considered an error condition; EDH errors are reported on an

error second basis.

Equalization (EQ)

Process of altering the frequency response of a video amplifier

to compensate for high-frequency losses in coaxial cable.

embedded audio

Digital audio is multiplexed onto a serial digital data stream.

error second

A second that contains at least one error. An error second can

result from one isolated error, or a “burst” of many errors all in

the period of one second.

FFCRC (full field CRC)

A CRC derived from the samples in a full field of digital video.

Described in SMPTE RP-165.

format group

An SDA 601 Watch group that contains:

G Line/field length

G TRS (includes EAV and SAV)

G ANC format

G Zero-length ANC

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Tektronix SDA601 Manual do Utilizador Página 67