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Digital Betacam Composite output Quality
Text item: Text_1
Recently, we ran into a problem when viewing the composite output
of a digital betacam. Basically, it looked horrible. Upon further
research, we came to find that there is no filtering done on the
signal when it is encoded. This means that the composite output is
passing frequencies very unfriendly to the NTSC environment.
In discussing the problem with Sony, they contend the output was
specifically designed this way in order to minimize generation loss.
I have difficulty believing that in engineering a digital format
machine there would be concern about generation loss from a composite
The reason this output is an issue in the first place is because at
times we need to use the digital machines as analog playback sources
in our analog edit suites. The difference in the signal quality
between the normal beta-sp and the digi-beta has at times become
prohibitive due to these high frequency artifacts.
If there is anyone out there that has experienced the chroma crawl
and general rattyness of this composite output and has discovered a
workaround short of putting an encoder on one of the digital outputs,
please let me know.
Thanks in advance, Ed