On Sunday 05 March 2017 17:04:00 GiaThnYgeia wrote: > ΟΚ! > > Gene Heskett: > > On Sunday 05 March 2017 15:18:00 GiaThnYgeia wrote: > >> Back to shanity, how does a microphone produce an electrical wave > >> that can be translated into sound and how a wave may take the form > >> of electrical current that produces sound through a speaker? > > > > Very simple. With the glaring exception of the modern AC induction > > motor that in 99% of the stuff we buy, ANY other generator can also > > be used as a motor, including the ultra cheap electret condenser > > microphones, ditto any speaker, including the peizo tweeters, is > > also a microphone. Its part of the basic physics everything we use > > works by. > > So, are you saying the standard motherboard beeper/speaker (the one > that beeps when you hit too many keys at once or that bios is telling > you I am booting up ... any minute now beeeeepp) is a microphone that > feeds sound back into the system and mysteriously debian is allowing > it to be recognized as an input device. > > I do not claim to have reinvented the wheel here, but how can this be > acceptable if it does hold any truth? > > > Cheers, Gene Heskett > > kAt If debian identify's it as a microphone, take it up with debian. Udev has been know to goose the moose before. File a bug if that is the actual case. And yes, that "speaker" might be a piezo beeper, but with the right amps looking at it, it will make a halfway decent microphone. This is paranoid scary given some of the tricks the NSA has pulled off. But commercial intercoms have been using a small speaker as the talkback microphone for at least the 70 years that I have been chasing electrons for a living. That dates back to well before the transistor was invented.
And yes, I am now an old fart of 82. But I was an electronics geek well before the term became popular. I quit school in '48, and started fixing them newfangled things called tv's for a living. I finished off the last 18 years I worked by having a nameplate on my office door that said I was the Chief Engineer, w/o ever going back to school unless it was as the teacher. Along the way I collected a 1st phone ticket from the FCC, and a CET from a small town college prof in Nebraska, turning in the test in about 45 minutes. He had been teaching students for that certification for several years. I was the first to walk in, hand him the 20 to take it, and passed it. Its normally allowed 4 hours. IMO? He had no business teaching it if in 5 years or so, none of his students had passed it. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene>