Nevion FRS-HD-CHO - Manual (Page 18)

FRS-HD-CHO Rev. 9
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Term Description Term Description
Video error trigger Audio error trigger group 1 - 4
APV Active picture CRC invalid Ch 1
(2,3,4..) Channel 1 set inactive in audio control
package
FFV Full frame CRC invalid Group Audio group missing (in audio trigger
1,2,3,4, group = group 1,2,3,4)
EDH EDH package missing (SD only) ACP Audio control package missing
VSTD Video standard error U/O Audio underflow/ overflow ch. 1 - 4
FFCRC Full frame CRC error (SD only) BCH Audio CRC error
APCRC Active picture CRC error (SD only) 48kHz Sampling rate different from 48kHz
detected
LOCK Loss of re-clocker lock Audio in silence trigger
CCS Chroma checksum error Ch1-2 (3-
4..15-16) Audio level received in channel 1 and 2
below set silence threshold
YCS Luma checksum error Audio out clipping trigger
CCRC Chroma CRC (HD only) Ch1-2 (3-
4..15-16) Audio out (after audio processing gain) is
clipped.
YCRC Luma CRC (HD only) APVF and silence trigger
LNUM Line numbering error (HD only) Ch1-2 (3-
4..15-16) Audio level received in channel 1 and 2
below set silence threshold while active
picture video freeze is also detected
SAV Start of active video error
EAV End of active video error
Video content trigger
VCLP Video clipping detected by legalizer
FFVF Full frame video freeze detected
APVF Active picture video freeze detected
TCF Time code freeze detected
BLK Black video detected (below set
threshold)
The black detect threshold is an integer between 0 and 255. Selecting a threshold of 10 will
accept everything below 74 (04Ah) luma and between +10 and -10 (1F6h and 206h) chroma
as black.
The silence threshold can be adjusted in 6dB steps from -90dB to -18dB.
„Audio in silence trigger‟ and „APVF and silence trigger‟ share the same silence
threshold setting. It can only be a
djusted from the „Audio in silence trigger‟. The
threshold value in „APVF and silence trigger‟ will always display as 0 and the
threshold value in „Audio in silence trigger‟ is always the one used by the module.
5.4 De-glitcher
The de-glitcher corrects timing errors within a line. The de-glitcher has a 2048 samples
buffer. When the first signal is present,
we call it the “initial phase signal”, data is taken from
the centre of this buffer. If the timing reference of the video signal changes, when for
instance a new source being switched into the signal path, the timing errors occurring by this
change will be corrected if the new timing reference is within +/-1024
samples of the “initial
phase signal ”. This also goes for all consecutive timing references.
If a signal is more than +/-1024 samples off
relative to the “initial phase signal”, the output will
repeat the last frame, refill the 2048 samples buffer and take out data from the centre of the