sorry, missed commenting on this in my last post, I currently have some extra time, so here goes :
A53/E is certianly referenced in that Document as a "reference documents" and, in Techncial appendix 1 as follows and as specifically involves "Video formats" (from the famous or infamous Table 3) :
Originally Posted by CECB requirements
Equipment shall be capable of receiving and presenting for display program material that has been encoded in any and all of the video formats contained in Table A3 of ATSC A/53E. The image presented for display need not preserve the original spatial resolution or frame rate of the transmitted video format.
But, follows below is all I can find in that document which specifies audio requirements for the CECB's -- especially note the "may" which I bolded from appendix 2 (Note ATSC A/54 Document is ATSC's "guide to Digital Television standard" which I believe I provided a link to in earlier post in this thread - Section 6.6 specifically involves "6.6 Main, Associated, and Multi-Lingual Services : For example, describes specifics regarding different audio streams for spanish language/hard-of-hearing/etc .....
Originally Posted by cecb requirements
From Tech appendix 1 :
19. Audio Outputs
The RF output must be modulated with associated audio program information; the RCA audio connectors must provide stereo left/right, when broadcast.
From tech appendix 2 :
Outputs (audio) :
process associated audio services described in Section 6.6 of A/54
RF output may provide monaural audio for the selected audio channel.
RF output may provide BTSC stereo for the selected audio channels.
And now for something somewhat completely different .....
From the Group W Test bench files and a post I was going to make(on another thread, I think, as is the quote from Holl_ands) some time ago, but didn't .... If all these links still work, It seems one of the 27 glossy 8x10 photos, the one that shows the curly headed guy dumping the garbage may have went missing .....
Originally Posted by holl_ands
So far, I haven't bought any....because I have yet to see what I want:
Defect Free, Smart Antenna, S-Video, EZ-ADD, Signal LEVEL (not just Quality).
I am a bit puzzled by the NTIA requirements regarding the signal meters ...
Here :TECHNICAL APPENDIX 1, NTIA Coupon-Eligible Converter Box (CECB),Required Minimum Performance Specifications and Features
It simply says on this issue :
Originally Posted by doc at above link
24. Signal Quality Indicator
The equipment will display on the television receiver signal quality indications such as signal strength per ATSC A/74, Section 4.7.
"such as" signal strength -- Not "has to be" signal strength meter ... Ok, well, I should just leave it at that, but the W bench group has inquiring minds so ....
We notice that in Federal Register/Vol 72, No 50/Thursday March 15, 2007/rules and regulations, page 12109 Paragraph 94
, a portion of the following document which begins onon page 12097 of Federal Register/Vol 72, No 50/ from Thursday March 15,2007
, entitled (note the "final rule" provision) :
DEPARTMENT OF COMMERCE
National Telecommunications and Information Administration
47 CFR Part 301
[Docket Number: 0612242667—7051—01]
Rules to Implement and Administer a Coupon Program for Digital-to-Analog Converter Boxes
AGENCY: National Telecommunications and Information Administration, Commerce.
ACTION: Final rule.
it says :
Originally Posted by Ntia DTVcouponFinalRules
"NTIA notes that the A/74 guidelines states that ‘‘[t]he capability to display received signal quality conditions on a quasi-real time basis is a feature that should be included in all digital broadcast receivers.’’ To further assist consumers in improving signal reception, we include in the Final Rule provisions that require manufacturers to include software which will display on the television receiver signal strength and permit the display of other operating parameters chosen by the manufacturer. Display of signal information on the television receiver will provide information to the consumer at minimal cost. NTIA will not, however, specify exactly what such signal-quality information should contain. NTIA will follow the guideline of A/74, that
‘‘[m]eans to achieve such signal quality indications should be left to the judgment of individual receiver manufacturers.’’153
153 - 153 Advanced Television Standard Committee, Standard A/74, section 4.7 ‘‘Consumer Interface– Received Signal Quality Indicator.’’
Of course, ATSC doc. A74 "ATSC Recommended Practice: Receiver Performance Guidelines (with Corrigendum No. 1 and Amendment No. 1)"
Section 4.7 says :
Originally Posted by ATSC A74Doc
4.7 Consumer Interface—Received Signal Quality Indicator
The capability to display received signal quality conditions on a quasi-real time basis is a feature that should be included in all digital broadcast receivers.
Unlike analog reception, transmission impairments such as echo, interference and noise do not manifest themselves in uniquely identifiable ways in a digital broadcast receiver’s display. Reception and display of digital signals on a digital receiver is largely a “go-no go” experience for the consumer, and the received picture or audio by themselves offer little useful guidance as to the relative difficulty of the current reception conditions.
A digital broadcast receiver’s digital signal quality indicator should be more than simply a signal strength meter, and should take into account the effects of multipath and interference impairments, as well as insufficient or excessive signal level. Moreover, the signal indicator should be easy to understand, intuitive to use and easy to access for a consumer in order to effectively position or aim an antenna, judge the need or effectiveness of additional front end amplification and/or aid in other user-controlled adjustments to optimize the receiver’s configuration with respect to the current reception conditions.
Receiver manufacturers should consider two applications of indicator displays; setup displays and operational displays. Each application should provide some manner of signal level indication as well as indications of the effects of multipath and interference impairments. Setup displays should be persistent to facilitate the installer’s achieving proper system alignment. Operational displays may be transient or under user control if desired. User options should be provided in both categories.
Means to achieve such signal quality indications should be left to the judgment of individual receiver manufacturers.
Hmmm ... A74 says a "signal strength" meter is not enough, and goes on to specify/recommend all the stuff we'd love to have (like the missing Glossy 8x10 Photo) as signal diagnostic tools on our receivers, but then says "Means to acheive such signal quality indications shuld be left to the judgment of individula receiver manufactuers" .....
Well, OK, for the most part that's what the NTIA info at first link above says as well ... but what about the part from vol 72 of federal register that says :
"We include in the Final Rule provisions that require manufacturers to include software which will display on the television receiver signal strength
and permit the display of other operating parameters chosen by the manufacturer. " ...
Gee, that seems to the group W bench like it's saying they are specifically requiring signal strength
meters ... did they revise/change/amend that or something, or did the rule get "shortened" and summarized by the time the manufactuers got the "spec sheet" so that it lost the "signal strength" meaning ?
If not then where's the signal strength meter on my Zenith DTT900's ????? I can't seem to find it, it doesn't seem to be the thing that pops up when you push the "signal" button, that looks to be a signal quality meter. And my guess is, it may be implemented along the lines (if not exactly like this) as discussed in a Document Hollands provided a link to earlier in thread, entitled : " Preliminary DTV Field Test Results And Their Effects on VSB Receiver Design" Gary Sgrignoli Zenith Electronics Corporation - 8/20/99 --
As follows (the last part being of most interest) :
Originally Posted by Sgrignoli/zenith paper - portion of pg 3 paragraph 1
..... The MPEG data sync is reinserted at the receiver output for subsequent processing in the receiver’s MPEG transport decoder. The one-segment long binary frame sync not only provides pseudo-random number sequences (PN) for data frame synchronization, but can also be used as a training signal for the receiver’s equalizer and as a means to measure received signal quality.
You can get anything you want, except good signal diagnostic tools ...
I think The moral to this story may be either :
#1). Specs may be specs, but don't assume anything when you have "specs" that say things like : "signal quality indications which should be left to the individual receiver manufactuers" ....
#2). Welcome to the world of almost no required receiver performance standards ... exception involving a few requirements for the CECB's from NTIA, most of them "reception" related .... It's a situation where, as just one example we have broadcasters required to send 12 hours of EPG info via PSIP EIT's, but very few receivers which support displaying the info beyond the current or next program, if they even display that ....