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This is not news. AVS HDTV Forum members have been discussing and helping DTV broadcasters sort out ATSC issues for years. With all new technology it takes time to work out the bugs.


The object of this "report" is to support the Triveni datacasting effort by putting DTV in a negative light and to sell their problem detection services.


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"Better living thru modern, expensive electronics devices"

tm


[This message has been edited by Ken H (edited 07-31-2001).]
 

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Don't bash them JUST because they ALSO work with datacasting.

They are offering lots of software and equipment to make DTV work properly, including data analyzers and program guide software.

If the PSIP data (analogous to software in a PC) does not work properly, your Digital TV does not work properly!


Their website is: http://www.trivenidigital.com


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Ken English, Sr. Engineer, KSL-TV/-DT.

"Not a REAL Engineer, but I play one in TV"


[This message has been edited by kenglish (edited 08-01-2001).]


[This message has been edited by kenglish (edited 08-01-2001).]
 

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Discussion Starter #5
I would suggest that this report illustrates encoder manufacturer's lack of adherance to the published ATSC standards, thus messing up the signals everyone receives. It's not a simple matter of "working out the bugs" but rather adhering to a standard that, while not yet mandatory, will soon be if these folks don't get their acts together.


No matter how great a producer's or broadcaster's signal may be before it leaves the plant, an improperly implemented encoder will muck it up something fierce, getting everyone in a tizzy running around trying to figure out if the problem is the STB they bought, the model of antenna they're using, the broadcaster or network's fault or something else.


While Triveni certainly wants to sell their products, the findings of this report are still valid and significant irrespective of the sales element. Dismissing these results simply because they come from a manufacturer of test gear is shortsighted at best and irresponsible at worst.
 

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I'm not trying to dismiss the results, I actually agree with them. As I said in the first sentence, this is not news to members here.


As someone who makes a living selling technology, I'm just pointing out that this might not be a fully objective report. Any document produced by a company that is selling a service related to the data contained within must be considered suspect, until proven otherwise. This is standard practice in business, sort of like keeping the fox out of the hen house. And in my opinion, this is compounded by their conflict of interest with datacasting.


I have no axe to grind here, perhaps kenglish can provide more information on Triveni's track record in this area. If they are providing a legitimate service to their potential customers, good for them, word will spread and their sales will benefit.


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"Better living thru modern, expensive electronics devices"

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As someone who has used Triveni's analysis service I can say that it does help identify problems, even very minor ones that do no affect reception (such as some timing variations in the packets outside ATSC specs). I made changes in our encoders audio bandwidth from 384kb to 448kb as a result. One thing it did not identify, because they didn't goo that deep into the individual packets, is that our Triveni PSIP generator is apparently sending duplicate packets twice in a row. Someone else had to bring that to my attention.


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Discussion Starter #9
Not having used Triveni's service, but being familiar with the importance of the issues their report raises, I can attest to the fact that buffer underflow and overflow is a key issue in what many viewers may describe as "reception" problems.


There are other products that analyze the ATSC transport stream, but as they are quite expensive, the service that Triveni is offering appears to be one that is necessary and should be supported. In my experience, most broadcasters are doing the minimum to get their service on air due to budget constraints, thus anything that can help them get more digital programming to air while expending as few dollars as possible can't be all bad.


Skepticism is healthy, however my experience in helping broadcasters to get on air with their digital services perhaps gives me a different view of Triveni's efforts. Their report doesn't appear to put DTV in any more of a "negative light" than it already is by broadcasters transmitting non-compliant transport streams that viewers can't receive or demux properly.
 
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