Digital MEMS Microphone Data acquisition.

[Ethan25]

Hi,

I'm using INMP441 - 24 bit digital mems microphone.
I'm trying to collect data at 44.1KHz sampling rate

so for a minute (60sec),
44100 * 60 = 2646000 samples
for 32 bit,
2646000 * 4 = 10,584,000 ~ 10MB

assuming I do at 16KHz,
16000 * 60 = 960000 samples
for 32 bit,
960000 * 4 = 3,840,00 ~ 3.8MB


ESP32 WROOM 32 has 512KB of RAM assuming 300KB is available for utilisation,
307,200/4 = 76,800
so,
@44.1KHz = 76,800/44,100 = 1.74 seconds
@16KHz = 76,800/16000 = 4.8 seconds

so how do i even record audio using this? am i going wrong anywhere with my calculation ? I'm confused. Thanks.

 

[KlausST]

Hi,

the third thread with similar topic.

so how do i even record audio using this? am i going wrong anywhere with my calculation ?

In the other thread you ask why they use 16 bits instead of 24 bits. I guess you already know the answer now.
AND .. in the other thread I and others already talked about compression...
And... I already meantioned real time processing and storing algorithm... to save data space.

A simple conclusion also is, that RAM it not a suitable medium for huge audio data storage.
SD-cards, SSD or HDD may be more suitable.

Klaus

 

[Ethan25]

I understand it now, apologies for the confusion.
thank you.

Hi,

the third thread with similar topic.


In the other thread you ask why they use 16 bits instead of 24 bits. I guess you already know the answer now.
AND .. in the other thread I and others already talked about compression...
And... I already meantioned real time processing and storing algorithm... to save data space.

A simple conclusion also is, that RAM it not a suitable medium for huge audio data storage.
SD-cards, SSD or HDD may be more suitable.

Klaus