3 ms·
The author should look into DTMF, they were quite popular in packet radio and you got a 1200 baud datarate. Haar Wavelet transform would probably be a lot less
by jmpe 13y ago
The author should look into DTMF, they were quite popular in packet radio and you got a 1200 baud datarate. Haar Wavelet transform would probably be a lot less CPU-hungry than FFT.
http://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling http://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signa...
- acjohnson55 13y agoThe history of the modem [1] is also probably a relevant read. That's basically what the author has recreated. [1] http://en.wikipedia.org/wiki/Modem http://en.wikipedia.org/wiki/Modem