Re: [Elecraft] K3s DSP headroom
This is very good advice. My TXEQ settings are similar -- I'm using more low cut and about half as much HF boost. My friend Fred, K6DGW, has severe hearing loss, probably a result of his military service. Knowing my experience in pro audio, he asked my advice for his K3. I recommended RXEQ settings with extreme low cut below about 800 Hz and extreme boost above that frequency. He says it works well for him. His hearing loss is so severe that he probably would not hear distortion if it were present. 73, Jim K9YC On Tue,9/20/2016 6:26 AM, Joe Subich, W4TV wrote: On 9/20/2016 7:59 AM, brian wrote: > I seem to recall this advice (from Elecraft?): Use the attenuation sides of the equalizers and not the gain side if at all possible. Yes, this came from Lyle, KK7P who designed the DSP. > This begs the question. If gain is bad to use, then why is it (up to > +16 db) included as a choice. Why not limit it to some small value? His commend was not to use large values of boost across the passband. one band of significant boost should not be an issue unless it is in the middle of the passband. For example, I have experimented with some rather aggressive high frequency boost profiles (-16, -16, -6, 0, 0, 6, 10, 12) without apparent problem but aggressive mid-range boost (-16, -16, 0, 10, 10, 10, 13, 15, 16) results in obvious distortion. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3s DSP headroom
On 9/20/2016 7:59 AM, brian wrote: > I seem to recall this advice (from Elecraft?): Use the attenuation sides of the equalizers and not the gain side if at all possible. Yes, this came from Lyle, KK7P who designed the DSP. > This begs the question. If gain is bad to use, then why is it (up to > +16 db) included as a choice. Why not limit it to some small value? His commend was not to use large values of boost across the passband. one band of significant boost should not be an issue unless it is in the middle of the passband. For example, I have experimented with some rather aggressive high frequency boost profiles (-16, -16, -6, 0, 0, 6, 10, 12) without apparent problem but aggressive mid-range boost (-16, -16, 0, 10, 10, 10, 13, 15, 16) results in obvious distortion. 73, ... Joe, W4TV On 9/20/2016 7:59 AM, brian wrote: I seem to recall this advice (from Elecraft?): Use the attenuation sides of the equalizers and not the gain side if at all possible. This begs the question. If gain is bad to use, then why is it (up to +16 db) included as a choice. Why not limit it to some small value? It would seem this area is ripe for some real measurements. 73 de Brian/K3KO On 9/20/2016 11:02 AM, Ramon Tristani wrote: Important question. Could the designer from Elecraft please answer? Sent from my iPhone On Sep 20, 2016, at 6:12 AM, f1gwr wrote: Question for the K3s DSP programmer(s): After reading the "audio" thread and trying to optimize my audio equalizer, my questions are: what is the headroom over the 0 dB equalizer? Or does the DSP has its own normalizer/AGC to avoid overload? Found a satisfactory setting, with maximum values being set to 0 dB in the voice band (300-3 k), and consequently have to turn the volume halfway in a calm room (audio preset= high). My concerns are: - not clipping the AF while overflowing the DSP, namely registers during calculations. - getting enough AF gain so to have sufficient audio power especially in noisy environments. Said in another way what is in practice the maximum safe gain settable in the equalizer? VY 73, Christian F1GWR in JN38SN K3s groupie __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to r.trist...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to als...@comcast.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to li...@subich.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3s DSP headroom
I seem to recall this advice (from Elecraft?): Use the attenuation sides of the equalizers and not the gain side if at all possible. This begs the question. If gain is bad to use, then why is it (up to +16 db) included as a choice. Why not limit it to some small value? It would seem this area is ripe for some real measurements. 73 de Brian/K3KO On 9/20/2016 11:02 AM, Ramon Tristani wrote: Important question. Could the designer from Elecraft please answer? Sent from my iPhone On Sep 20, 2016, at 6:12 AM, f1gwr wrote: Question for the K3s DSP programmer(s): After reading the "audio" thread and trying to optimize my audio equalizer, my questions are: what is the headroom over the 0 dB equalizer? Or does the DSP has its own normalizer/AGC to avoid overload? Found a satisfactory setting, with maximum values being set to 0 dB in the voice band (300-3 k), and consequently have to turn the volume halfway in a calm room (audio preset= high). My concerns are: - not clipping the AF while overflowing the DSP, namely registers during calculations. - getting enough AF gain so to have sufficient audio power especially in noisy environments. Said in another way what is in practice the maximum safe gain settable in the equalizer? VY 73, Christian F1GWR in JN38SN K3s groupie __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to r.trist...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to als...@comcast.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K3s DSP headroom
Important question. Could the designer from Elecraft please answer? Sent from my iPhone > On Sep 20, 2016, at 6:12 AM, f1gwr wrote: > > Question for the K3s DSP programmer(s): > > After reading the "audio" thread and trying to optimize my audio equalizer, > my questions are: what is the headroom over the 0 dB equalizer? Or does the > DSP has its own normalizer/AGC to avoid overload? > > Found a satisfactory setting, with maximum values being set to 0 dB in the > voice band (300-3 k), and consequently have to turn the volume halfway in a > calm room (audio preset= high). > > My concerns are: > - not clipping the AF while overflowing the DSP, namely registers during > calculations. > - getting enough AF gain so to have sufficient audio power especially in > noisy environments. > > Said in another way what is in practice the maximum safe gain settable in the > equalizer? > > VY 73, > Christian F1GWR in JN38SN > K3s groupie > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to r.trist...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
