Re: [Elecraft] [K3] K3 DSP LPF daughterboard - What is an artifact and where can you find them?
Brendan, Not to be argumentative, but some with HF hearing loss may be bothered by this distortion even though it is low level and is not in the range of conscious hearing. When I first became aware of my HF hearing loss, I found that I was increasingly irritated by low grade audio devices because of the THD. It seems I can 'sense' the distortion even though I cannot actually hear in that range. Strange as it may seem, I went on a quest for better fidelity in sound as my hearing loss became worse. I have mentioned this phenomenon to several knowledgeable dealers in audio equipment as well as my audiologist and they have confirmed what I have observed. If the hearing loss is across the full spectrum, the increased perception of distortion is not present. My lower range hearing remains normal, and my audiologist tells me that is an unusual condition, so that may have something to do with my perceptions. I will put the LPF on my K3, 'just in case'. 73, Don W3FPR. Brendan Minish wrote: > As I have pointed out before, It's subtle, you are not going to hear > this at all if you have HF hearing loss, the D to A chip is performing > per spec and the K3 prior to this change is already better than a lot of > the competition. > > __ 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] K3 DSP LPF daughterboard - What is an artifact and where can you find them?
there are few if any pairs of 'communications' phones that have significant attenuation above 10Khz yet retain good flat frequency response over the range we are interested in (~ 100Hz to 4KHz ) the artefacts are aliasing products centred around 12Khz, since these are not harmonically related to the fundamental audio the ear is pretty sensitive to them, even though they are at least 60dB lower than the wanted audio. As I have pointed out before, It's subtle, you are not going to hear this at all if you have HF hearing loss, the D to A chip is performing per spec and the K3 prior to this change is already better than a lot of the competition. 73 Brendan EI6IZ On Sun, 2010-01-03 at 03:20 -0800, Julian, G4ILO wrote: > Keith Hamilton-3 wrote: > > > > I would imagine there are a lot of us who hear the "artifacts" but just > > don't > > realize it? This would account for the undefinable "fatigue" some talk > > about. > > > You can see these "artifacts" with a program like Spectran, but they are > only present when modulation is present and they are at a very low level, > probably no worse than the THD of budget consumer audio products. As someone > said to me in an email recently, they probably wouldn't be an issue if > people used communications headphones and speakers with their radios instead > of hi-fi models. > > - > Julian, G4ILO. K2 #392 K3 #222. > * G4ILO's Shack - http://www.g4ilo.com > * KComm - http://www.g4ilo.com/kcomm.html > * KTune - http://www.g4ilo.com/ktune.html > -- 73 Brendan EI6IZ __ 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] K3 DSP LPF daughterboard - What is an artifact and where can you find them?
Keith Hamilton-3 wrote: > > I would imagine there are a lot of us who hear the "artifacts" but just > don't > realize it? This would account for the undefinable "fatigue" some talk > about. > You can see these "artifacts" with a program like Spectran, but they are only present when modulation is present and they are at a very low level, probably no worse than the THD of budget consumer audio products. As someone said to me in an email recently, they probably wouldn't be an issue if people used communications headphones and speakers with their radios instead of hi-fi models. - Julian, G4ILO. K2 #392 K3 #222. * G4ILO's Shack - http://www.g4ilo.com * KComm - http://www.g4ilo.com/kcomm.html * KTune - http://www.g4ilo.com/ktune.html -- View this message in context: http://n2.nabble.com/K3-DSP-LPF-daughterboard-What-is-an-artifact-and-where-can-you-find-them-tp4244576p4245639.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
