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.pdf 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/technical-documentation/data-sheets/adv7181d.pdf > > > 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-board-critique-sought > > 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 > > ==== > > 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 ..... :-)* > >
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