1、 CEA Bulletin DTV Recommended Practice for Locating and Navigating among ATSC Television Channels (Including PSIP Recommendations) CEA-CEB12-B April 2010 NOTICE Consumer Electronics Association (CEA) Standards, Bulletins and other technical publications are designed to serve the public interest thro
2、ugh eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards, Bulletins and other
3、technical publications shall not in any respect preclude any member or nonmember of CEA from manufacturing or selling products not conforming to such Standards, Bulletins or other technical publications, nor shall the existence of such Standards, Bulletins and other technical publications preclude t
4、heir voluntary use by those other than CEA members, whether the standard is to be used either domestically or internationally. Standards, Bulletins and other technical publications are adopted by CEA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, C
5、EA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard, Bulletin or other technical publication. This CEA Standard is considered to have International Standardization implication, but the International Electrotechnical Commis
6、sion activity has not progressed to the point where a valid comparison between the CEA Standard and the IEC document can be made. This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of t
7、his Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. (Formulated under the cognizance of the CEAs R4.3 TV Data Systems Subcommittee.) Published by CONSUMER ELECTRONICS ASSOCIATION 2010 Technology rather, some s
8、impler scenarios are addressed. CEA-CEB12-B assumes that the user sets up the receiver without professional assistance, and that setup is menu-driven, simple, and mostly automatic. It is possible, however, that receivers may be professionally installed and set up by trained technicians. CEA-CEB12-B
9、does not currently address receivers that have built-in satellite receiving capability, nor receivers that access EPG databases using phone lines. Nor does it address cable set-top boxes, satellite boxes, VCRs, DVD players, or other auxiliary devices or connections. CEA-CEB12-B uses the terminology
10、defined in ATSC A/65, and should be read in conjunction with ATSC A/65. NOTEDesigners should be aware that there are FCC regulations that may apply to functions described in this CEA-CEB12-B; and while every reasonable attempt was made to have this CEA-CEB12-B conform to those regulations in place a
11、s of the date of publication, implementers are cautioned to read and understand all applicable regulations. 2 References Designers are encouraged to use the most recent editions of the reference standards listed here. 2.1 Informative References The following standards contain provisions that, throug
12、h reference in this text, constitute informative provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most rece
13、nt editions of the standards indicated below. 2.1.1 Informative Reference List ATSC A/53:2007, ATSC Digital Television Standard, Parts 1-6 ATSC A/65D, Program and System Information for Terrestrial Broadcast and Cable, 2009 CEA-608-E, Line 21 Data Services, April, 2008 CEA-708-D, Digital Television
14、(DTV) Closed Captioning, August, 2008 ANSI/CEA-766-C, U.S. and Canadian Rating Region Tables (RRT) and Content Advisory Descriptors for Transport of Content Advisory Information Using ATSC Program and System Information Protocol (PSIP), April, 2008 CEA-CEB12-B 2ATSC A/69, Recommended Practice: Progr
15、am and System Information Protocol Implementation Guidelines for Broadcasters, 25 June 2002 2.1.2 Informative Reference Acquisition CEA Standards and Bulletins: Global Engineering Documents, World Headquarters, 15 Inverness Way East, Englewood, CO USA 80112-5776; Phone 800-854-7179; Fax 303-397-2740
16、; Internet http:/; Email ATSC Standards: Advanced Television Systems Committee (ATSC), 1750 K Street N.W., Suite 1200, Washington, DC 20006; Phone 202-828-3130; Fax 202-828-3131; Internet http:/www.atsc.org/stan The VCT may include data describing NTSC services as well as digital services on other
17、Transport Streams. In Table 1, the VCT recovered from DTV PTC 21 includes data relevant to an analog NTSC signal whose analog TSID value is 32. An NTSC signal with TSID value 32 was found on RF channel 12. Also in Table 1, the TS with TSID value 25 found at DTV PTC 20 includes a VCT that lists two s
18、ervices carried in the same TS as well as two carried on a different TS (one with a TSID value of 77). Table 1 shows a case where, due to the presence of a translator in the area, the same Transport Stream is received at two different RF frequencies. The Transport Streams received at DTV PTCs 11 and
19、 23 are known to be identical because the TSID value for both is 77. The Master Channel Map may include other types of data for analog or digital signals, for example the last and/or maximum received signal strength or antenna position (if an electronically operated antenna positioning system is sup
20、ported). RF Channel TSID VCT Channel TSID Source ID Svc. Type SLD (PIDs) Sig. Str. 10 (analog) 11 77 11.1 KABZ-DT 11.2 KABZ-D2 77 77 1 2 ATSC ATSC #,#, #,#, 8.3 12 32 (analog) 20 25 11.1 KABZ-DT 11.2 KABZ-D2 11.3 KABZ-D3 11.4 KABZ-D4 77 77 25 25 1 2 3 4 ATSC ATSC ATSC ATSC #,#, #,#, #,#, #,#, 8.6 21
21、 33 12.0 KEBC 12.1 KEBC-D1 12.2 KEBC-D2 12.3 KEBC-D3 32 33 33 33 5 11 12 13 NTSC ATSC ATSC ATSC - #,#, #,#, #,#, 7.8 22 113 12.1 KU-D1 12.2 KU-D2 113 113 3 4 ATSC ATSC #,#, #,#, 0.0 201 10.0 KEY 10.1 KEY-D1 10.2 KEY-D2 10.3 KEY-D3 200 201 201 201 17 1 2 3 NTSC ATSC ATSC ATSC -#,#, #,#, #,#, 7.9 23 7
22、7 11.1 KABZ-DT 11.2 KABZ-D2 77 77 1 2 ATSC ATSC #,#, #,#, 5.5 Table 1 Example Master Channel Map In the VCT column in Table 1, the channel number reflects the major and minor channel number fields from the VCT (the delimiter, shown here as a decimal point, is not transmitted). The channel name refle
23、cts the short_name field from the VCT (in this example, some broadcasters chose to include hyphens). The contents of the short_name field are at the discretion of the broadcaster. CEA-CEB12-B 6Designers should be aware that the value of the short_name field in the VCT may not be unique among the var
24、ious broadcasters in a given area. Two or more broadcasters could name a minor channel “Sports“ or “News“ for example. The navigation functions in the receiver should accommodate different VCs labeled with the same short_name text. The column labeled “SLD (PIDs)” in Table 1 demonstrates that the Mas
25、ter Channel Map should include PID data from the Service Location Descriptor (or Program Map Table). Two different Transport Streams were found (at different times) on DTV PTC 22. 5.2 User Channel Map Table 2 is an example of one construction of a User Channel Map. Channels listed in the User Channe
26、l Map represent programming services offered to the user. In Table 2, the channel number is the primary service identifier, so the User Channel Map is organized by channel number (the virtual number for digital services and the literal RF channel number for analog services). The fact that translated
27、 signals are available for certain services is hidden from the user in the User Channel Map. If the user navigates to channel 11.2, the TS transmitted in either DTV PTC 11 or 23 may be tuned. Both are known to be equivalent because both are identified with TSID value 77. Chan No. and there should be
28、 one, and only one, entry in the User Channel Map for each such combination found during the search. The receiver should track duplicates in the Master Channel Map and should hide this information from the user. The receiver should decide to ignore all but the best (based upon front end metrics) sig
29、nal, or it should check for the best signal each time the user accesses a program carried on one of these duplicated DTV PTCs. See Section 11.5 for more guidance. ; i) NTSC signals with TSIDs that are also found in a digital VCT should not be duplicated in the User Channel Map. The link should be to
30、 the RF frequency on which the receiver found the NTSC signal, not the frequency listed in the VCT. As with the digital signal, the receiver may find two or more NTSC signals with the same TSID. Again, the receiver should assume that this is due to translators and act accordingly. j) NTSC signals wi
31、th TSIDs that are not found in the VCT of a digital channel (presumably because the digital channel is not receivable, although the NTSC channel is receivable) should be flagged, since no EPG data will be available for them. Likewise, NTSC channels without a TSID should be similarly flagged for the
32、same reason. These channels may be listed in the EPG with an appropriate note explaining the lack of data. k) Once the receiver has completed its search and built a Master Channel Map, it is recommended that a list of available channels be presented to the viewer (a User Channel Map), sorted by majo
33、r channel number and then by minor channel number. It is recommended that NTSC signals that do not have a TSID not be automatically given a minor channel number of “0“. NTSC signals with a TSID but no receivable digital counterpart, however, should have a minor channel number of “0“ added. l) At thi
34、s point in the set-up process, the user is usually given the option to add or delete channels. Deletion of minor channel “0“ or NTSC channels without TSIDs is not expected to present future challenges. However, deleting other minor channel numbers is of concern because the broadcaster may add and/or
35、 remove minor channels from time to time. When this happens, the receiver will have to revise its channel maps. Also, a broadcaster may add one or more new major channel numbers to its VCT; again, whenever this happens, the receiver will have to rebuild its Master Channel Map. m) Allowing the user t
36、o manually add individual channels (resulting in an update to the Master Channel Map) is a challenge and is not recommended. If the receiver did not find a satisfactory signal during the search routine, it will be necessary to, at a minimum, adjust the antenna, and to do that requires that the recei
37、ver be force-tuned to the DTV PTC that contains the VCs that the user wishes to add. For professional installation and servicing, the receiver is capable of being so tuned. If the user knows the DTV PTC carrying the VCs to be added, the user should be allowed to force-tune the receiver to that DTV P
38、TC. However, the user should be warned that, once the antenna is adjusted to add a channel, it may no longer receive a satisfactory signal from other transmitters previously found during the search routine and already included in the Master Channel Map. n) With a rotating antenna, the receiver could
39、 build a complete Master Channel Map by having the user initiate multiple add-on scans (see section 9.2.2) with the antenna pointed in each of the known correct directions from which signals are received. o) The situations discussed in items m) and n) may require professional set-up. Also they may t
40、hwart the updating process, so the user should be cautioned. If, for example, a user lives in Princeton, NJ and leaves the antenna pointed toward New York for several days, the TV is unlikely to have up-to-date EPG CEA-CEB12-B 9data for the Philadelphia stations. Consumer success in adding channels
41、and using a rotator, as discussed in items m) and n), requires that the user know the DTV PTC number of the signal carrying the desired VCs and be able to directly tune the receiver to that DTV PTC. In that case, the user may do whatever is necessary with the antenna configuration to obtain a usable
42、 signal. Upon successfully acquiring the DTV PTC the user would desire a display of the currently available VCs and what is on them. 6.2.2 Scenario 2Receiver Directly Connected to Cable, and Receiver is “Cable-Ready” In this scenario, it is recommended that the set-up for a “cable-ready” receiver co
43、nnected to cable with no set-top box between the receiver and the cable include the following: a) Out-of-the-box, the user is instructed to first connect the RF cable to the receiver. b) If scrambled services are desired, the user is instructed to obtain a Point of Deployment (POD)2module from the c
44、able operator and insert it into the receiver POD slot. c) Upon power-up, the user is requested to supply the following information: i) Local time zone. ii) Whether or not Daylight Saving Time is observed at this location. iii) Whether connected to cable or antenna (only if receiver does not determi
45、ne mode automatically). iv) Language preference for audio. v) Language preference for closed captions. d) The initialization procedure for a POD module is outside the scope of CEA-CEB12-B. POD interface information may be found in SCTE 28 2003 (formerly DVS 295) and other documents. If a valid POD i
46、s not present, or is removed, the receiver may proceed with the following setup procedures: i) The user is requested to perform a from-scratch scan. See 9.2.1. ii) The receiver searches all cable channel frequencies and builds a list containing the results of that search, identifying whether each si
47、gnal is QAM, 8-VSB or NTSC. iii) For each unscrambled NTSC signal found, the receiver collects the analog TSID, if present, and associates it with the RF channel on which it was found. iv) For each QAM and VSB signal found, the receiver collects the PSIP tables, if present, of any in-the-clear progr
48、am and associates it with the DTV PTC on which the digital signal was found. It is recommended that the receiver cache the PIDs for audio, video and data for each minor channel listed in the VCT to speed acquisition. The receiver should ignore any scrambled MPEG-2 programs (or virtual channels) foun
49、d on a DTV channel. v) The receiver aggregates the VCTs collected from the digital signals, and adds any NTSC signals that have been located that are not present in a VCT, to build a Master Channel Map. vi) NTSC signals with TSIDs that are not found in the VCT of a digital channel (presumably because the digital channel is not available, although the NTSC channel is) should be flagged, since no EPG data will be available for them. Likewise, NTSC channels without a TSID should be similarly flagged for the same reason. Th
