It might be possible to decompose speech into a constellation of formants and filter out frequency and time components that didn't match human speech patterns, a bit like a Viterbi decoder for speech. You'd have to be careful not to overfit the training vocabulary and to allow for different speakers, languages, etc. I expect the processing would add a lot of delay.
Get started in digital voice on HF with the information and software at http://freedv.org/ The current favorite mode is 1.25 KHz wide. wunder K6WRU On Feb 5, 2014, at 3:18 PM, Phil Hystad <[email protected]> wrote: > Wayne, > > Thanks for the quick reply. My friend and I were discussing ways of doing > this (that is, sending/receiving clear voice with DSP helps) and then I > decided that it has been done. Well, not by the K3 because it does not > digitize the actual signal being sent but I was thinking of D-Star and its > use with repeaters. I wonder how wide that digital signal is, maybe you > know. D-Star on HF might be too wide. > > 73, phil, K7PEH > > > On Feb 5, 2014, at 2:59 PM, Wayne Burdick <[email protected]> wrote: > >> Hi Phil, >> >> The KX3 (and K3) both provide several ways to make speech signals more >> intelligible in the face of noise or reflections, including NR (stochastic >> noise reduction), NB (impulse blanking), and passband shift/width >> adjustment. I'm not sure that compensation for multipath distortion is >> possible or even desirable, but it's an interesting question. >> >> 73, >> Wayne >> N6KR >> >> >> On Feb 5, 2014, at 2:48 PM, Phil Hystad <[email protected]> wrote: >> >>> For you KX3 signal processing experts and the algorithms implemented for >>> the KX3? >>> >>> Is there any work to clean up an actual SSB signal to make it more >>> intelligible in cases of various phase changes or interference via >>> reflections (ionosphere). I mean, a slightly warbled signal cleaned up to >>> reduce or eliminate that kind of distortion? >>> >>> I am not even sure if or how this can be done as my experience in signal >>> processing is certainly not up to that level but it seems that it may be >>> possible. >>> >>> No, this is not because I am having a problem with my KX3, it is a question >>> asked by a friend of mine so I am relaying it here. >>> >>> 73, phil, K7PEH >>> >>> >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[email protected] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >> > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html -- Walter Underwood [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
