Talk:Serial Digital Interface
From Wikipedia, the free encyclopedia
Contents |
[edit] Audio bits
Digital Betacam has 20 bit audio. This article puts the bit depth of SDI embedded audio at 16 bit. Is SDI embedded audio 20 bit capable? I can't seem to find the answer.
- SD-SDI can carry up to 16 channels of embedded audio. The sample rate will be 48 kHz and quantizing resolution of 20 and 24 bits are supported. HD-SDI is the same except that the audio channels are always carried at 24 bits. Of course not all of these bits are necessarily meaningful. The original capture of the material may be at resolutions as low as 16 bits. That will be as much information is trully present downstream, regardless of the bandwidth of the channel. Signals at different bitdepth are always carried such that the most significant bits are aligned with each other. In other words, higher bit depth will provide more granularity (and thus a lower noise floor), but does not make the signal louder. user: tvhead
[edit] Nuts
All these names for the same thing are driving me nuts. Is this the same as CCIR 602 and D1 video?
[edit] Rewrite
I rewrote the article, including lots of additional information, and removing lots of factual errors. I also removed the cleanup tag. Hope you all like it. --EngineerScotty 08:36, 5 March 2006 (UTC)
[edit] Confusion over Colorimetry
There probabably needs to be a paragraph pointing out that the values of Y, Cb and Cr are different for HD (1080i and 720p), versus SD (576i and 480i) (also ED 576p and 480p), because of the differences between Recommendations 709 and 601.
Also there's a lot of computer editing and format conversion software that doesn't recognise the overshoot margins inbuilt into the digital gamut of the ITU-R/SMPTE standards.
[edit] a link to a redirect
if you click "SMPTE 292M" found under "1.1 Standards" you will be redirected th this page
an idea to remove/change it? —The preceding unsigned comment was added by 80.61.121.14 (talk) 16:00, 5 February 2007 (UTC).
[edit] Why mention G.703 at all ?
As far as I know, a G.703 line -- e.g. a telecom carrier-provided T1 (~1.5Mbit/s) or E1 (~2Mbit/s) line -- is never used to carry a SDI, let alone an HD-SDI signal. The available bandwidths are orders of magnitude too small. The only similarity between SDI and G.703 is that they are serial digital transmission channels typically carried over coaxial cable, but as the bandwidth, technologies, equipment and application domains so different, I think that any mention of a IT/telecom standard like G.703 here is irrelevant or misleading in a video context (which "SDI" generally implies) and should be removed. Besides, if serial data transmission over coax lines is to be mentioned, standards like Ethernet over thin coax (10BASE2) could be included too. 213.224.83.4
[edit] serial / parallel
Great page, but one point of confusion: This is the Serial Data Interface, but the text says "In SD and ED applications, the parallel data format is defined to 10 bits wide, whereas in HD applications, it is 20 bits wide, divided into two parallel 10-bit datastreams (known as Y and C)." So is it serial or is it parallel? Presumably it gets serialized before being sent on the one coax cable, but this reader for one is confused. Rockfox212 22:33, 21 October 2007 (UTC)
[edit] Supported video formats
If you are going to clarify that NTSC and PAL are used incorrectly to describe their highly compatible formats (although PAL really isn't... B/G/D/I/K are), you should also correctly define them. NTSC is technically a video system definition and does not include color (NTSC-II and NTSC-III do), PAL is technically a colour encoding method, not a video system. --tonsofpcs (Talk) 18:28, 29 March 2008 (UTC)
