- From: Michael A. Dolan <miked@tbt.com>
- Date: Tue, 31 Aug 1999 17:14:40 -0700
- To: www-tv@w3.org (WWW TV List)
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Allen- Thanks for the response. Comments below. Just a suggestion - while I am not prepared yet personally to discuss requirements, perhaps you could re-post your proposal separately from this thread for those that might wish to? Mike At 01:37 PM 8/31/99 -0400, allen mornington_west wrote: > >One of the earlier terms to be defined is "channel" and from its use in >this document it seems that there is confusion between the use of the term: > "channel" implying the RF carrier, or signal bearer mechanism >by which a service is delivered >and: > "channel" implying the commercial identity of the service which is >borne. It was not intended to be either of the above, and nothing was meant to be implied. It is intended to be just the Program Stream as stated. And, it is specifically *not* RF emissions, carriers, or commercial entities. I would pikc a term like "Station" for this. Do you think this entity should be defined? >For so much of the analog (TV) service world we have been used to these >terms being the same. For a digital world we need to separate these senses >- hard though this may be. One approach would be: > "channel" A reference to the RF or modulated signal bearer >mechanism by which a service is delivered. This definition is inconsistent with ATSC terminology and thus undesirable from my perspective. I tried carefully in these definitions to not conflict with any existing definitions in MPEG, DVB or ATSC. They are thus not perfect for any one of these spaces, but they also are not in conflict. I did think awhile about whether to call it "channel" or "service". I went with "channel", since there was no conflicting DVB definition (that I am aware of), it is more commonly understood; and thus more likely to be used in practice on this list by everyone. >and: > "service" A composition of signals describing audio, data or >video media components (or essences) As I noted in my definitions, this is, in fact, the DVB term for the ATSC channel. As far as I can tell, your definition for "service" is identical to my definition of "channel" (a Program Stream). Am I missing something about how your definition is different, or are you simply suggesting the term be "service" instead of "channel"? >Network operators may be responsible for the operation of one or more >channels and, in general, there will be one or more - often licensed - - - >service providers providing programs. A program would be thus one or more >time sequential events would have been scheduled to have been delivered >within a service using the channel. You introduced several new terms above: network operator service provider events So, I'm not sure everyone understands what you said (and with the new definition of channel, I'm not sure I do either). Can you please offer definitions for these terms if you think we need them? Regards, Mike - -----BEGIN PGP SIGNATURE----- Version: PGP for Personal Privacy 5.0 Charset: noconv iQA/AwUBN8xkzil9dIG/haQGEQISYwCgx+YKCRnObqzIZiLmaRrozLe17+EAoLBh 28fUWJays4b/umr+4uKK7hGd =dXC3 - -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- Version: PGP for Personal Privacy 5.0 Charset: noconv iQA/AwUBN8xv3yl9dIG/haQGEQJhCQCg1vmWfommmGOIGVg+83QdC1t8YNEAoNxy ORjNiwBb97afr4cLXvOi5UP5 =EdGS -----END PGP SIGNATURE----- ------------------------------------------------------ Michael A. Dolan, Representing DIRECTV, (619)445-9070 PO Box 1673 Alpine, CA 91903 FAX: (619)445-6122
Received on Tuesday, 31 August 1999 20:39:14 UTC