Quote:
Originally Posted by 880
A time base corrector has an ADC chip to convert the video for processing, yes?
So why does it convert it back to analog before output? Why not have a TBC that sends digital video out? This would avoid another DAC to ADC conversion.
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There is a reason however, why so few capturing cards feature a TBC, even in the pro field.
First of all, the computer entered in the pro field too late for the analog - the pros prefer HW solutions, they are by far more stable than their Windows-based counterparts, and are simpler to service. Adding SoCs valued to at least 1000$ (were are talking about the times when analog tapes were still in use) to capturing cards in the same price range was an expensive useless addition.
Secondly, repeated ADA conversions in the pro field are not that destructive as in the consumer field. Various music effects are done digitally in studios, yet the connections were analog. Many replicating factories did ADA before cutting the disc. Even in the consumer realm, people can copy a CD the analogue way (CDplayer -> CDrecorder) without noticeable loss of quality, sometimes the ADA even improves the sound. Some earlier pro decks that record digitally the video did not have a digital interface.
So, it was too late, not needed, and costly.
http://www.bhphotovideo.com/c/produc...g_and_SDI.html
or the double priced
http://www.canford.co.uk/Products/90...deo-in-and-out