[Cin] adv7181d (video decoder chip)
randrianasulu at gmail.com
Sun Feb 12 20:23:55 CET 2023
сб, 11 февр. 2023 г., 16:41 Andrew Randrianasulu <randrianasulu at gmail.com>:
> 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
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
> 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!
> 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:
> 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?
> 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 ..... :-)*
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Cin