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<p>I don't see how anything in your replies is helpful.<br>
<br>
- They are definitely tone frames. Tones run through the vocoder <br>
are irrelevant and OP25 would handle them just fine anyway.<br>
<br>
- Why should the user seek other solutions? The system is sending <br>
IMBE tone frames and any decoder thrown at it should handle it.<br>
<br>
- And how does simulcast have anything to do with this? It doesn't.<br>
<br>
To the OP: You need to record the raw signal (I/Q data or FM <br>
demodulated audio) so someone can analyze it. Then the decoder logic <br>
can be updated to accommodate tone frames and you'll get your audible alerts.<br>
<br>
At 04:19 PM 16-06-2018, 'William Becks' wllmbecks@gmail.com [op25-dev] wrote:<br>
><br>
><br>
>What exactly are you trying to determine about the tones?  They <br>
>appear to be “Alert” tones sent by the dispatch operator ahead <br>
>of the voice message. I don’t think they actually serve as a <br>
>signaling function as would commonly be found in analog paging systems.Â<br>
><br>
><br>
><br>
>I believe that someone has already stated that there are only a <br>
>handful of specific tones or tone combinations that are provided for <br>
>in the P25 vocoder. Any other tones or tone combinations <br>
>transmitted into the speech input of the vocoder quote likely will <br>
>not reproduce and exact replica as the source tone(s) primarily <br>
>because the vocoder is designed to encode and compress speech.<br>
><br>
>Bill, WA8WG<br>
<br>
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