3 ms·
I wonder if his system works with Fax/modem connections. He uses ADCs, so I guess not? That would be a hard requirement for me if I ever built something similar
by dark-star 4y ago
I wonder if his system works with Fax/modem connections. He uses ADCs, so I guess not? That would be a hard requirement for me if I ever built something similar
- aswanson 4y agoI think fax modems had 14.4 kbps bandwidth but I'm sure that chip he used has enough dsp horsepower to implement the modem.
- teraflop 4y agoIt's hard to say for sure without seeing more technical detail, but I would expect that a modem connection would "just work" without any further changes. The point of a modem is to translate data into an analog signal that can be decoded after going through a lossy transmission line, subject to bandwidth constraints and noise. The ADC introduces quantization noise, which affects the signal-to-noise ratio, but the same thing happens in a "real" phone line that goes over a digital trunk, and modems are designed to tolerate it. Also, even if the connection quality is especially poor, modems are designed to perform a "line probing" algorithm, in which both ends of the connection will fall back to the slowest connection speed that can be reliably established.
- zokier 4y agoIn this case only the control plane is digital, the signal plane stays fully analog from end-to-end. So it really should not have any trouble with fax/modem signals.