| Home |
| Search |
| Today's Posts |
|
#11
July 10th 07, 06:19 AM
posted to sci.electronics.basics,rec.radio.shortwave,rec.radio.amateur.antenna,alt.cellular.cingular,alt.internet.wireless
|
|||
|
|||
AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency
"isw" wrote in message ... In article , Jeff Liebermann wrote: "Bob Myers" hath wroth: "Ron Baker, Pluralitas!" wrote in message .. . No nonlinearity is necessary in order to hear a beat? Where does the beat come from? An audible beat tone is produced by the constructive and destructive interference between two sound waves in air. Look at a pictorial representation (in the time domain) of the sum of sine waves,of similar amplitudes, one at, say, 1000 Hz and the other at 1005, and you'll see it. Bob M. I beg to differ. There's no mixing happening in the air. compression of air is very linear (Boyles Law or PV=constant). In general, that's true, but take a look at what happens in the throats of high-powered horn loudspeakers. You can find info in e.g. "Acoustics" by Beranek. Isaac Red herring. |
| Thread Tools | Search this Thread |
| Display Modes | |
|
|
![Ron Baker, Pluralitas![_2_] is offline](https://www.radiobanter.com/images/SultanThemeVB3R/statusicon/user_offline.gif)
Threaded Mode
