Re: [Elecraft] K3 RX audio on voice modes oh no here we go again
You're right, Paul -- I skimmed right past the pink idea (oops) and interpreted the poster's concern as a more common one that customers have brought up, namely that they can hear higher-order products (above the nominal communications passband). Sloping the response is a very simple thing to do, and we've added that to the list. But we're also pursuing the high-order product issue. Interesting discussion! 73, Wayne N6KR On Apr 25, 2009, at 12:47 AM, pd0psb wrote: Wayne, I'm sorry to disagree. White noise will remain white within a restricted bandwidth. The better/steeper the filters (and the K3 has those) the more the noise character will remain white within the chosen bandwidth. 73' Paul PD0PSB Band noise is filtered three times before it gets to the AF amp: at the crystal filter, the DSP I.F. filter, and the DSP A.F. filter. It is most definitely pink by the time you hear it. 73, Wayne N6KR --- http://www.elecraft.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 -- View this message in context: http://n2.nabble.com/K3-RX-audio-on-voice-modes-%3Coh-no-here-we-go- again%3E-tp2699273p2702000.html Sent from the [K3] mailing list archive at Nabble.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 --- http://www.elecraft.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
[Elecraft] K3 RX audio on voice modes oh no here we go again
Hi fellow Elecrafters, The K3 is the best pleasant radio I ever had, but it also is one of the most ear fatiguing I've ever listened to on voice. I'm very surprised about this because Wayne's brilliant design should be able to sound like the very finest sound equipment. The DACs and audio stages are all top-notch. I did a couple of tests in my audio studio and came up with the following (ridiculous?) idea: -The white atmospheric bandnoise (we all love her) should somewhere down the line be converted to (near) pink audio noise before it hits our ears. In the K3 and maybe many other receivers this doesn't happen, white RF noise is linearly translated to white audio noise, sounding high emphasized to the human ear. I have a feeling in older receivers this was mildened by the electronics that somehow gave a natural roll-off up the spectrum. Too simple,right? I thought so too. So I built an accurate 3db/octave downsloping filter (in software) and fed it with the K3's RX audio. A -3dB/octave downslope converts white noise (equal energy per Hz) to pink noise (equal energy per octaveband) For our ears pink noise sounds flat since we listen to frequencies in a logarithmic manner. How did it sound with or without ?To me, like night and day. -K3 in pink mode sounds round,smooth and balanced out. RX EQ now works correctly and is able to really shape the sound to many different flavours. -K3 in white mode to me sounds mean,agressive and sharp.RX EQ can hardly correct this. Could anyone else give this a try? There are quite a lot of software EQ's able to make a -3dB/octave slope. Or milder slopes if you wish as long as it's quite precise in dB/oct. I wouldn't like a new discussion about different tastes of audio/speakers/headphones/etc but I would be very interested in other people able to copy this experiment and comment on it. I have a feeling the K3 can do way(ne) better then it does in the audio department. Please excuse my english 73' Paul PD0PSB __ 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
Re: [Elecraft] K3 RX audio on voice modes oh no here we go again
paul bijpost wrote: The white atmospheric band noise (we all love her) should somewhere down the line be converted to (near) pink audio noise before it hits our ears. Band noise is filtered three times before it gets to the AF amp: at the crystal filter, the DSP I.F. filter, and the DSP A.F. filter. It is most definitely pink by the time you hear it. However, it seems that we have some customers with such good hearing that they could benefit from additional rolloff at the output of the DAC driving the AF amp. Lyle and I are exploring ways to do this. We've added you to the short list to test anything we might come up with. 73, Wayne N6KR --- http://www.elecraft.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
