Crystal Vision
Problem solving
TANDEM-200 User Manual R1.7
134
13/02/2008
The Demux Input status-only display is summarised below:
SEL
No.
Display
Audio input status examples and comments
0
A=n_1234dO
SDI1 Demux Status, where n is input Audio Group Selected
Example: A=2_1-34_O, Audio Group 2 selected and Audio
Groups 1, 2 and 4 present on side 1, Other data present
1
B=n_1234dO
SDI2 Demux Status, where n is input Audio Group Selected
Example: B=__no INP, no SDI input on side 2
2
DxSr_xx_yy
Codes: Ok, Lo,
Hi, Wd, na, ni
SDI1 & SDI2 Demux Sample Rates.
Ok – correct number of samples per TV frame sequence
Lo – sample rate too low
Hi – sample rate too high
Wd – wild sample rate fluctuation
Example: DxSr_na_Ok, No embedded audio in SDI 1 input,
SDI2 Sample Rate normal
3
DxCs_xx_yy
Codes: Ok, Er, na,
ni
SDI1 & SDI2 Demux Checksum Status.
Ok – checksum correct
Example: DxCs_Ok_Er, SDI1 correct, but SDI2 has a
checksum error as a result of corrupted data inside an audio
block, or checksum value.
4
DxPy_xx_yy
Codes: Ok, Er, na,
ni
SDI1 & SDI2 Demux Parity Status.
Ok – parity correct
Example: DxPy_Er_Ok, SDI2 correct but SDI1 has corrupted
data inside the embedded audio block. This may result in an
incorrect parity value at the end of each sample.
5
DxCF_xx_yy
Codes: Ok, Er, na,
ni
SDI1 & SDI2 Demux Channel Format and Data Block Status.
Ok – parity correct
Example: DxCF_Ok_ni, SDI 1 Channel Format correct, no
SDI signal on side 2
If in error, incorrect data values may occur during an insert.
6
HANC_xx_yy
Codes: Ok, Er, na,
ni
SDI1 & SDI2 Demux Channel HANC Status.
Ok indicates good values which include good ‘black’ or
‘blank’ space in HANC of at least 56 contiguous words.
Example: HANC_ni_Ok, SDI1 is not present but SDI2 has a
normal HANC
Note:
TANDEM-200 will attempt to correct some classes of error but in severe cases the audio
may be muted.
If there are less than 56 contiguous words of ‘black’ or ‘blank’ space in the HANC, there
may not be sufficient space to embed a further Audio Insert. To be able to embed new
audio data, it may be necessary to blank the entire HANC area.
Investigate the reasons why there is so much data in the HANC space if necessary try
HANC blanking in upstream equipment where appropriate. If only one audio insert is to
be preserved, de-embed that, HANC blank and then re-embed it. Use a second embedder
to insert the new audio – mode 2 suits this requirement best.
