[Lowfer] 136 Dial freq for OP-OPDS 32 for tonight...,

[Douglas D. Williams]

Ah, thanks John, for the clarification.

I suppose we all "correlate pattern recognition" to some degree, even with
QRSS, or even normal speed CW.

I love this hobby. Wish I had more time for it.

D. KB4OER


On Thu, Dec 19, 2013 at 4:34 PM, JD <listread at lwca.org> wrote:

> So, is it true that OPDS can only decode callsigns that it has in its
>>>> database? In other words, if a new station started transmitting 136 kHz
>>>> Op32, there is zero chance that OPDS would decode it, though "vanilla"
>>>> Opera could?
>>>>
>>>
> No, to the extent I understand it, OPDS can decode anything new that's got
> enough signal to noise for regular OPERA to decode.
>
> It appears to me to work something similar to WSPR's deep search.  The
> difference is in the _partial_ decodes, which the detection software would
> not be able to declare positively as this or that station on its own.
> Marcus himself describes the improvement as both a function of detection
> AND IDENTIFICATION.  He adds, "It attempts to do a correlation between
> received signals and templates from a predefined search list of callsigns."
>  In other words, by comparing the recognizable pieces of actual decoded
> signal to an expected pattern, it can identify the _probability_ of it
> being this or that station.  Hence, the correlation factor in the display.
>
> Personally, the lower the correlation, the more I would be inclined to
> call that a question of pattern recognition rather than a decode.
>
> But before anyone flames me for saying anything beyond what I actually
> did, however, let me state clearly that pattern recognition algorithms are
> a valid tool in some types of communication, and I'm not saying anybody
> shouldn't pursue any tool they like.  All I've been saying is that
> terminology matters, and a lot of misimpressions...and even wishful
> thinking...seem to arise from loose use thereof.
>
> John
>
>
>
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