3 ms·
Heh, if you think this is a risky hack, you'd be amazed at how we used to use the internet. Once upon a time, we used these things called modems that modulated
by bradleyland 13y ago
Heh, if you think this is a risky hack, you'd be amazed at how we used to use the internet. Once upon a time, we used these things called modems that modulated an analog signal in such a way as to send digital communications down a wire that was designed as the technological equivalent of two tin cans attached to a string. It's a miracle any of it ever worked. Hell, it's a miracle any of this stuff works.
Many of these devices are, essentially, modems. They modulate the analog signal in ways that are tolerant of the faults typical in analog systems. Fortunately, they've got two things going for them:
1) They're sending the analog signal over a very, very short distance.
2) Modulated communications are a very well developed field of signal transmission.
They're hacks, but they're old, established hacks.
- csmuk 13y agoIt's not a miracle or a hack. Modems were sound bits of engineering and were based on international standards that allowed them to interoperate with each other properly. They had clearly defined electrical and protocol standards. They may use the principle of a modem but there is no established standard for communication. I assume that you know about impedance and loading based on the above? If the internal resistance of the current loop suddenly flies up or down, is the circuit on the other end going to perform to the same? Nope. There will be less current available for the device. At that point it will work intermittently or stop working all together. Your microphone or earphones will still work quite happily though.
- bebna 13y agoBut there are Standards. 2 to be exact: one from OMTP and one from CITA. The OMTP one, is even used as national standard in china: http://www.cspress.com.cn/u/cms/www/201208/17092831ounz.pdf http://www.cspress.com.cn/u/cms/www/201208/17092831ounz.pdf