сб, 11 февр. 2023 г., 16:41 Andrew Randrianasulu <[email protected]>:
May be I read it wrong but table 10 suggest it can even output 20 bit (!!!) yuv for no reason ?? (input ADC only 10 bit)
ah, it seems 20-bit thing was just 10-bit per yuv component, formatted for ITU-R BT.1120 https://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.1120-8-201201-S!!PDF-E.... p. 3 === 2.1 Serial video data Y, CB and CR signals are handled as 20-bit words by time-multiplexing CB and CR components. Each 20-bit word corresponds to a colour-difference sample and a luminance sample. The multiplex is organized as: "
Note, very early version without any letter at the end seems to say "9 bit ADC". Also, some versions may support "16 bit port" or "8 bit port" depending on exact packaging!
https://web.archive.org/web/20221006213255/https://www.analog.com/media/en/t...
Four 10-bit ADCs sampling up to 75 MHz 10 analog input channels SCART fast blank support Internal antialiasing filters
GENERAL DESCRIPTION The ADV7181D is a high quality, single-chip, multiformat video decoder and graphics digitizer. This multiformat decoder supports the conversion of PAL, NTSC, and SECAM standards in the form of composite or S-Video into a digital ITU-R BT.656 format.
At least 10 bit yuv 4:2:2 seems to be real at chip level
"10-Bit SDR ITU-R BT.656"
I have no idea if there even way to store 20bit per component yuv ....
But board for it will be definitely not beginner's project:
https://electronics.stackexchange.com/questions/311491/adv7180-breakout-boar...
slightly different board but high-speed challenges outlined ...
Apparently some of those chips (same family) were used in some Blackmagick devices but not necessary in best for vhs config?
https://www.digitalfaq.com/forum/video-capture/4356-dazzle-dvc107-video.html
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And I just received a reply from the Australian BlackMagic Design distributor, confirming that their Intensity Pro card uses the ADV7180. Though they tell me it doesn't handle timebase errors well, and they recommend an external TBC! That's disappointing! Sounds like it's been configured for very stable professional equipment. ------------------------------ * Last edited by AusDaz; 07-15-2012 at 09:04 PM. Reason: Updated info * *====* *note, 10 years later we have some software to try ... I successed in compiling vhs-decode branch of ld-decode, at least mains script do not err out on my Slackware, so ..... :-)*