https://devzone.nordicsemi.com/f/nordic-q-a/78617/after-i-read-mic-pdm-data-how-do-i-convert-it-to-dbHi， I am doing a micphone &quot; sph0641lm4h-1 &quot;, and I use api of nrf_drv_pdm .c, when I read mic data from sph0641lm4h-1 , they are just sets of 16 bit data, the following figure: pdm_buffer[0], pdm_buffer[1], pdm_buffer[2], pdm_buffer[3], pdm_bufferen-USTelligent Community 13Tue, 17 Aug 2021 00:53:48 GMThttps://devzone.nordicsemi.com/thread/325201?ContentTypeID=1Tue, 17 Aug 2021 00:53:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:16003df8-2853-4a2c-92ac-69465c177c55Tomlee<p>Hi&nbsp; yvind,</p> <p>&nbsp; &nbsp; Thanks for your reply.</p> <p></p> <p>&nbsp; &nbsp; Do you mean using &quot;<strong style="color:#11171a;font-style:normal;font-weight:bold;letter-spacing:normal;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;white-space:normal;">amplitude = 20 * log10(abs(sample) / 32767) dBFS</strong>&quot;&nbsp; ?</p> <p></p> <p>&nbsp;&nbsp; but I don&#39;t understand what the parameter &quot;sample&quot; is ?</p> <p>&nbsp;&nbsp; is it pdm_buffer[1]?&nbsp; or&nbsp; is it the average of all pdm_buffers?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/325094?ContentTypeID=1Mon, 16 Aug 2021 11:49:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cd5932fa-33a0-4138-b4f4-983e3e1cab70&#216;yvind<p>Hello,&nbsp;<br /><br />A quick google search gave me this result&nbsp;<br /><a href="https://devzone.nordicsemi.com/f/nordic-q-a/28248/get-amplitude-db-from-pdm">https://devzone.nordicsemi.com/f/nordic-q-a/28248/get-amplitude-db-from-pdm</a></p> <p>Let me know how that works for you.&nbsp;<br /><br />Kind regards,<br />Øyvind</p><div style="clear:both;"></div>