... , easy to avoid interference frequency: the product work in the 2.4GHz of the ISM (ie industrial, scientific, medical) band, ... frequency-hopping; In order to avoid the interference in the 2.4GHz band and the effects of interference on the sound ... digital audio sampling rate, 16bit samples to quantify levels2, low-power design3, GFSK digital modulation / demodulation method4,20 Hz ~ 20KHz frequency ...