Certainly true for youngsters. As a teen, I could easily hear TV sweep oscillators (16 kHz). But it's all literally down-hill (or down-frequency) from there, especially those of us d were exposed to a lot of nearby weapons firing in the military. You don't wear ear protectors in the Army.
I recall my hearing at the band of frequencies produced by a 30 caliber round being fired becoming so suppressed that each time I squeezed the trigger on my M1 rifle that I could hear every nuance of the bolt moving as it automatically chambered each round. The result is both a severe roll off of higher frequency sensitivity, lots of holes throughout one's hearing range, and chronic tinnitus. Back in the 60's the Army said that was "normal hearing" for a 20-something year old soldier. It's an experience one doesn't forget; my ears still ring, literally. 73, Ron AC7AC -----Original Message----- As I recall from my broadcasting classes years ago, human speech has a "typical" bandwidth of just 3KHz. "Normal" human hearing, IIRC, picks up frequencies from 20Hz to 20KHz. If someone has a copy of Schrader's "Electronic Communications" ready to hand, the specifics should be in there somewhere. - - 73 de N5ILN Alan ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
