CPC Main Group H03K 7/00 Modulating pulses with a continuously-variable modulating signal 5 direct subcodes Child Classifications Navigate with arrow keys, Enter to open H03K 7/02 Amplitude modulation, i.e. PAM H03K 7/04 Position modulation, i.e. PPM H03K 7/06 Frequency or rate modulation, i.e. PFM or PRM H03K 7/08 Duration or width modulation H03K 7/10 Combined modulation, e.g. rate modulation and amplitude modulation