This is a MSK ( Minimum Shift Keying ) Modulator and Demodulator in C. It comes with an additional test framework. It is using two tones ( 1200Hz, 2400Hz ) for a datarate of 2400 Bit/s at a samplerate of 14.4ks/s. It is performing close to theory in terms of bit error rate ( BER ) versus signal to noise ratio (SNR). It can be used for reliable slow data transmission in the voice band. Have fun! Cheers Detlef
This is better and new version of the transceiver with reduced calculation burden (no cosf, sinf, atanf needed, migration to integer calculation when possible) and an improved but simplified PLL for carrier recovery. Much fun for me, hopefully for you too! Cheers Detlef