Timeline for How is it that two electric currents can travel in opposite directions on the same wire, at the same time, without interfering with each other?
Current License: CC BY-SA 4.0
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| Dec 25, 2018 at 20:35 | history | migrated | from physics.stackexchange.com (revisions) | ||
| Dec 25, 2018 at 18:36 | comment | added | Andreas H. | @kostas "multiple inaccuracies": could you be more specific? Had you read the beginning of the answer ("- as I wrote earlier - "), you would have noticed that I referred to "modes" of propagation. But true, the last sentence in this form was inaccurate. I edited it to be precise and to match the body of the answer. | |
| Dec 24, 2018 at 22:24 | comment | added | Kostas | An overly complex answer for the question that was asked, and with multiple inaccuracies. Even grammar has problems here, what on earth is this supposed to mean: "the two propagation directions are always orthogonal" ??? | |
| Dec 23, 2018 at 22:57 | comment | added | Nemo | See also "sidetone" | |
| Dec 23, 2018 at 20:18 | comment | added | Todd Wilcox | @hobbs Your comment doesn't completely match my experience. I definitely hear my own voice when talking on a land line, loudly and clearly, and even on a line with no dial tone but battery (48 V supplied by the phone company), I can hear myself breathing into the test phone. That's how I know there's battery on the line. That last point does highlight the way that I agree with your comment: hearing yourself on a landline is not because of hearing your own signal on the line, it's the phone itself that is mixing the signal from your phone's microphone and the signal from the line. | |
| Dec 23, 2018 at 18:28 | comment | added | hobbs | @RobertHarvey no. Each end hears the other end in their speaker, without hearing their own voice (or at least, hearing a greatly attenuated version of it; mismatches in the system always cause a little bit of reflected signal). | |
| Dec 23, 2018 at 16:55 | comment | added | Robert Harvey |
In the old analog telephone system there was only a single wire pair, yet it was possible to speak and hear at the same time. -- Yes, but that's because the two voice signals were mixed, the same phenomenon that makes it possible to put multiple instruments into a song using a mixer.
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| Dec 23, 2018 at 13:38 | vote | accept | The Pointer | ||
| Dec 23, 2018 at 8:58 | history | answered | Andreas H. | CC BY-SA 4.0 |