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With this headline, I cannot hear anything in my head except “the dial-up noise.” TCP over sound was how I used to connect to the Internet…
by alanh 10y ago
With this headline, I cannot hear anything in my head except “the dial-up noise.” TCP over sound was how I used to connect to the Internet…
- aylons 10y agoGood catch, but it was actually over audio signals. Sound was just for monitoring.
- vacri 10y agoSome ye olde modems had a socket that you plugged your regular handset into: https://en.wikipedia.org/wiki/Acoustic_coupler https://en.wikipedia.org/wiki/Acoustic_coupler I think one was used in the film War Games, but can't recall clearly.
- larholm 10y agoWar Games used a Dataphon s21d, iirc. https://de.wikipedia.org/wiki/Akustikkoppler#/media/File:Acustic_copler_with_serial_interface_dataphon_s_21_d.jpg https://de.wikipedia.org/wiki/Akustikkoppler#/media/File:Acu... I had one for my C-64.
- aylons 10y agoI stand corrected! At least until the latter days of dial-up.
- mirimir 10y agoBack in the day, I carried an acoustic coupler with my laptop. Also a patch cable with alligator clips. And tools to disassemble stuff.
- biot 10y agoThat's a distinction without a difference. If another family member picked up the phone while you were dialed up, they certainly heard it.
- aylons 10y agoThat's why it was just for monitoring - you could hear, but the communication itself was not done via sound.
- deleted 10y ago[deleted]
- fizzbatter 10y agoI don't feel like your reply really explained the confusion. I'll go ahead and be the dense one haha. Can you further explain the difference in your example? I assume you mean that the bulk of the dial-up data was sent over non-audible ranges? Ie, we couldn't hear the actual data transfering, but we could hear the monitoring tones?
- aylons 10y agoYou're not being dense, not at all. I was in a hurry and not clear enough: Sound is different of audio signal. Audio signal is whatever way you arrange to represent signals in the audio range of frequencies and, usually, dynamic rang. Sound is a physical phenomenon caused by variation of pressure on air that we can listen to. So, the transfer was usually done by audio signals, transmitted electrically via copper wire (and, sometimes, magnetic coupling in some modems). You could, of course, convert these audio signals to sound by picking up the phone (or wiring the modem to the sound card), but this was just for you to listen to. The communication was not depended on sound itself.
- deleted 10y ago[deleted]
- brian-armstrong 10y agoI have those memories too! I'm certainly not claiming to have invented the idea of dial-up. The idea for this library is to provide a soft modem, highly configurable (thanks to liquid DSP), which comes "batteries-included" with a TCP stack (thanks to lwip). The examples shown in the README can even run on a nearly-ultrasonic modem profile whose spectrum content lies >= 19kHz
- netsin 10y agoSomeone's dog is going to hate this.
- ww520 10y agoYep, the good old dial-up modem. In this case, I assume they can beat the old modem bandwidth by cramming modulation in more ranges of frequency, with no need to adhering to the frequency range of the voice phone line.
- yitchelle 10y agoAh yes, the dial up modem. I remember the days that the QoS (the transmitting signal anyway) is adjusted by the volumne control on my modem.