略語大辞典 [C] 21 PTM pulse time modulation パルス時間変調. パルス幅変調, パルス位置変調など.pulse time modulation; pulse modulations; includes PAM(pulse amplitude modulation), PPM(pulse position modulation), PWM(pulse width modulation); in communications; [C:E:Opt]. 丸善「略語大辞典」JLogosID : 11856844