On Tue, Dec 20, 2011 at 06:24:13PM -0500, gene heskett wrote: > On Tuesday, December 20, 2011 06:22:02 PM Fons Adriaensen did opine: > > > Mmm. An IP3 of 40dB means that at e.g. -10dB (already high as > > an average level), IM is at -110dB. That is nowhere near to > > 0.5%... > > Picky Fons :), but I swear I can hear it, or maybe I stated the > terminology wrong? Or have I been listening to SSB radios too long? :-) Have you ever listened to AM radio on headphones with LSB in the left channel and USB in the right one (and the local oscillator synced to the AM carrier) ? It's absolutely wonderful. All the interference is stereo, and the AM station is exactly in the center which makes it very easy to ignore the interference. Regarding IM distortion, I've found that in many cases the cause is not the active analog electronics but non-linear contact resistance in switches, pots and faders. A few years ago I did a routine check on my analog mixer. It had horrible IM on one of the channels wired to the soundcard. And the reason was simply that the mic/line switch on that channel hadn't been used for years. Just toggling it a few times made the distortion go away... Ciao, -- FA Vor uns liegt ein weites Tal, die Sonne scheint - ein Glitzerstrahl. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
