Talk:AES3/Archive 1

Archive 1

Dubious

I've suggested that AES/EBU embedded timecode be merged into this article. However, this article states that bytes 18-12 of the channel status are a 32-bit audio-samples-since-midnight count. Reading Ratcliff suggests that this is not so, and that these bytes are a "32-bit binary" (BCD?) version of a SMPTE timecode, which is not the same thing at all. See See p.226 and 228 of John Ratcliff. Timecode: A user's guide. Focal Press, 1999. 276pp. ISBN 0240515390. This whole area is very poorly served by open references. -- The Anome (talk) 04:52, 29 April 2010 (UTC)

It's fairly clearly described on page 12 of the AES/EBU standard, in section 4 defining the Channel status format. To quote:

“ Bytes 18 to 21, Bits 0 to 7: Time of day sample address code

Value (each Byte): 32-bit binary value representing the first sample of current block. LSBs are transmitted first. Default value shall be logic "0".

Note

This is the time-of-day laid down during the source encoding of the signal and shall remain unchanged during subsequent operations. A value of all zeros for the binary sample address code shall, for the purposes of transcoding to real time, or to time codes in particular, be taken as midnight (i.e. 00 h, 00 mm, 00 s, 00 frame). Transcoding of the binary number to any conventional time code requires accurate sampling frequency information to provide the sample accurate time.

”

That sure sounds like "samples since midnight" to me. In particular, the note clearly says that it counts at the sample rate, not an externally defined rate. Of course, it is possible that practical implementations are at variance with the specification. 71.41.210.146 (talk) 05:30, 29 December 2010 (UTC)

Page move to AES3?

Yes, AES/EBU is a frequently used name, but why not entitle the page AES3 for greater precision in terminology? I propose moving the page to AES3 and making this page a redirect. Binksternet (talk) 14:47, 5 May 2008 (UTC)

 Done No response in over two years. Seemed like a good idea to me too so I did it. --Kvng (talk) 16:04, 29 December 2010 (UTC)

DARS

This article should mention the Digital Audio Reference Signal (AES Silence, AES Black). The link on the disambiguate "DARS" should link to this section. This article could be used for citation (if needed).

94.234.170.42 (talk) 17:55, 24 January 2012 (UTC)

I have added this discussion to the AES11 article and redirected Digital Audio Reference Signal there. --Kvng (talk) 14:35, 26 January 2012 (UTC)