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A better way to picture a dial-up modem's sound is as a digital communication constellation. Modems likely used BPSK, QPSK, 8-PSK, 16-QAM, etc modulations. For
by quahada 14y ago
A better way to picture a dial-up modem's sound is as a digital communication constellation. Modems likely used BPSK, QPSK, 8-PSK, 16-QAM, etc modulations. For a theoretical example, see http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation
- quahada 14y agoActually, a little research showed that a 56k modem uses PCM and PAM modulation schemes: http://www.eetimes.com/design/communications-design/4018048/An-Introduction-to-the-V-90-56K-Modem http://www.eetimes.com/design/communications-design/4018048/... So primitive...