Pulse density modulation vs pulse width modulation：何为PDM波形？
何为PDM波形？
How is Pulse Density Module (PDM) signal driven?
https://electronics.stackexcha
PDM and PWM are same on average, but for one cycle, PWM packs all ones together and all zeroes together to make the PWM frequency, but PDM distributes the ones and zeroes across whole period.
PDM vs PWM
https://www.eevblog.com
While PWM has a clearly distinguished period – above, 37 clock cycles –, pulse density modulation does not have a clearly defined period at all.
Pulse
https://en.wikipedia.org
Pulse-density modulation, or PDM, is a form of modulation used to represent an analog signal with a binary signal.
Pulse Width Modulation
https://www.realdigital.org
A PDM has the advantage of switching more frequently than a PWM circuit, and so the resulting waveform can have higher bandwidth or better characteristics.
脈波密度調變
https://zh.wikipedia.org
脈波密度調變（英語：Pulse Density Modulation，PDM）是一種二進制訊號的類比訊號調製方法。在PDM訊號中，脈波的相對密度對應類比訊號的振幅，並不像脈波編碼調製 ...
Pulse modulation
https://www.eevblog.com
In PDM, however, the values are not represented by frequency, but by density: the ratio when the signal is high (on) vs. low (off) over a period of time.
Implement a pulse
https://www.koheron.com
Pulse-density modulation (PDM) is an attractive alternative to pulse-width modulation (PWM) in applications where the PWM technique creates ...
PDM — Pulse density modulation interface
https://infocenter.nordicsemi.
The pulse density modulation (PDM) module enables input of pulse density modulated signals from external audio frontends, for example, digital microphones.