Liguid-dsp implements root-Nyquist harris-Moerder (hM-3) filter using Parks-McClellan algorithm as :
void liquid_firdes_hM3(unsigned int _k, unsigned int _m, float _beta, float _dt, float * _h)
void [liquid_firdes_hM3][2](unsigned int _k,
unsigned int _m,
float _beta,
float _dt,
float * _h)