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Andrew Porrett wap@ica.net [op25-dev] op25-dev at yahoogroups.comAt 11:35 AM 20-05-2018, nokoa3116 at gmail.com [op25-dev] wrote: >Do the tones not go like voice over radio. Generally, no. > Is it like a code that the scanner then changes into a beep? Yes. Tone frames encode a frequency index and a volume level. A receiver has to synthesize the indicated tone/volume for 20 ms per frame. Page 20 has a list of AMBE tones: <http://qsl.net/kb9mwr/projects/dv/codec/TIA-102.BABA-1%20%20P25%20Half%20Rate%20Vocoder%20Addendum%20.pdf> A slightly different list is found on page 58 here: <http://dvsinc.com/manuals/AMBE-2020_manual.pdf> IMBE tone frames are likely similar. -- -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/op25-dev/attachments/20180520/a3ed852d/attachment.htm>