MSK Minimum Shift keying transceiver in C

[Detlef _. (detlef_a)]

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

[Detlef _. (detlef_a)]

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