Hi Erik, It's R & D. Anything could happen.
I agree it's obvious but so are many things we see around us that weren't there a short time ago. The fundamental (vocal cord vibration frequency) changes constantly but not particularly fast (it is a mechanical thing we do with our muscles). The constant is the original carrier frequency. The relationship between the vocal cord harmonics have a computable relationship back to the original, I do think it's doable. I've done some work on speech compression that gives me some level of confidence. Cheers, Peter -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Erik Basilier Sent: Tuesday, 5 February 2013 8:05 PM To: [email protected] Subject: [Elecraft] [K3} [KX3] SSBT like CWT ? Peter, yes, I am sure many have thought about this. For something so relatively obvious, one has to wonder why it hasn't already been done. Perhaps the rapid changes in typical contest speech makes it hard to get an accurate enough fix on the spectrum, unless one asks the other party to say a long "aaaaaah" or some such sound? Or maybe the computing speed of the hardware is a practical obstacle for a given rig? Maybe it has already been tried by several people, and they ran into some kind of obstacle? Does the frequency around 85 Hz stay very constant for a given speaker, as he or she produces a variety of sounds? 73, Erik K7TV =============================================== This is an algorithm I've contemplated writing many times. Voice results from the vocal cords snapping together in the range around 85Hz. The filter effect of the various cavities, throat, mouth and nasal are quite high Q and filter the harmonic rich vocal chord excitation to produce the voice. If you watch an SSB signal on your PSK waterfall you'll clearly see the harmonics of the vocal chords. I think a DSP algorithm that calculates the location of the carrier based on the separation between the vocal chords is a definite doable proposition. It would give SSB the perfect clarity you seek. Love to have a go at this (I do DSP). Do you Elecraft guys want to have a go or interested in using it if I do it ? (I could probably do it as a piece of PC code that processes sound card input so you could evaluate it). Doesn't feel like to be a difficult thing to do. Cheers, Peter VK4JD ______________________________________________________________ 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
