Yeah -- RDS is a good analogy (except that it would have to fall within the audio passband). FT8 because it is good at low signal levels so it might be possible to not hear it and still have it decodable.
On Thu, Sep 23, 2021 at 2:33 PM James Shaver via wsjt-devel < wsjt-devel@lists.sourceforge.net> wrote: > Are you all thinking something similar to how RDS works with broadcast > signals or are you thinking something more robust due to the weak signal > characteristics of FT8? I can definitely think of some applications for > disabled ops to allow them to augment other appliances helping them on the > air. > > Jim S. > N2ADV > > > On Sep 23, 2021, at 2:18 PM, Glenn M-H via wsjt-devel < > wsjt-devel@lists.sourceforge.net> wrote: > > > > Maybe a sound processing system can analyze the sound signal and place > the FT8 signal between the lowest human harmonic frequencies greater than > 300Hz. > > > > After a compressor/clipper a bandwidth (50-100Hz?) with some center > frequency automatically chosen above, should be notched out - and the FT8 > signal inserted here. The FT8 signal must be inserted, after the non-linear > compressor/clipper, so the FT8 signal is not subjected to non-linearity. > > > > OZ1HFT > > > > - > > > >> Den 23. sep. 2021 kl. 19.27 skrev Philip Gladstone < > pjsg-w...@nospam.gladstonefamily.net>: > >> > >> I think that it would be an interesting experiment to transmit voice on > SSB with a continuous FT8 transmission (maybe at around the 1kHz offset) > and see whether there is a combination of offset & volume difference that > makes the FT8 decodable if the SSB is barely understandable or better, and > yet have the FT8 transmission be essentially inaudible. > >> > >> I'd like the FT8 transmission to just send the sender's callsign and > locator and not much else. This could be entirely automated by the > radio/microphone/speech processor/whatever. > >> > >> Philip > >> > > > > > > > > > > _______________________________________________ > > wsjt-devel mailing list > > wsjt-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/wsjt-devel > > > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel >
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