Questions tagged [mems-microphone]

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Interfacing to MEMS microphone with PDM output: what is causing this DC bias?

I have a MEMS microphone (IM72D128V01, using this eval kit) with PDM output connected to a STM32U5 NUCLEO board. (Background: it's connected to the ADF/Audo Digital Filter peripheral which I have ...
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I2S microphone data synchronization for left and right channel

I have I2S MEMS microphones (transmitters, stereo) in slave mode and a microcontroller in master mode. When the WS pin iw 0 (low) the data available on the SD pin is for the left channel (microphone ...
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2 answers
85 views

OPA344NA op-amp MEMS Mic

I'm planning on getting Audio Data from a MEMS Analog Microphone with an OPA344Nna as the OP-AMP. I'd like to just make sure the audio circuit looks correct. (Analog/Audio is something a bit new to me,...
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52 views

How to test Pulse Code Modulated sound signal?

I'm trying to perform a PDM to PCM conversion. The PDM signal is coming from MEMS microphone. There are different decimation approaches like FIR, CIC, cascade Half Band(HB) filters and so on. How ...
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1 answer
33 views

Understanding two Multivibrator models

I simulated the two multivibrator models in CMOS technology using the cadence tool. I was expecting the model 2 with Schmitt trigger(ST) will show robustness in PVT (Process Voltage temperature) ...
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1 vote
0 answers
150 views

Low-pass filter on PDM data provides data that does not have a FFT

I'm trying to convert PDM data into analog form by passing the data through a low-pass filter in Matlab. My approach is fairly simple and matches the answer given in this Electrical Engineering Stack ...
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  • 45
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1 answer
190 views

I2S on dsPIC generates signals, but interrupt is giving a problem

I am working with SPH0645LM4H-B MEMS microphone with I2S output. I successfully set up the SPI on dsPIC33CK256MP503 to the point, that it outputs the I2S clock at a rate 2MHZ, and WS control signal. ...
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0 votes
2 answers
105 views

Microphone closest to mimic human ear (not just few inches away) [closed]

I am currently doing a project that require sensitive microphone as in human ear for voice recognition - but not sure where to start. From what i understand common microphone could only pickup sound ...
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1 answer
152 views

Choosing an OpAmp for MEMS mic preamp stage

I am trying to create an updated version of a mems mic board, like this one from sparkfun. They use an INMP401 mems mic (which is not recommended for new designs) and an OPA344 for the preamp stage (...
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1 vote
1 answer
79 views

Do I need a stereo digital microphone? [closed]

I am working on a voice recording application. The circuit simply has microcontroller, flash memory and mems digital microphone. What are the advantages of using a stereo microphone on the quality ...
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2 votes
0 answers
170 views

How to connect a MEMS Microphone Breakout - INMP401 to a RN-52 bluetooth module?

I intended to use a INMP401 (MEMS MIC) to capture audio and stream it via bluetooth using an RN-52 bluetooth module (RN-52). The RN-52 has inputs for differential +- signals. The INMP outputs ...
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1 vote
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115 views

MEMS Microphone noise floor power level & audio noise spikes measurement

I have a circuit with a MEMS microphone and would like to be able to measure the audio noise spike contents and check the noise floor power level in the audio circuit. My intention is to connect the ...
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3 votes
1 answer
414 views

MEMS microphone gain calculation for MCU ADC

I've got a Knowles SPH1642HT5H-1 (pdf link) analog MEMS microphone that I'm planning to connect to one of the ADC inputs on an STM32. I've done what I think are the correct calculations to determine ...
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1 answer
662 views

SPW2430 MEMS MIC Taking time in returning to base Voltage

BREAKOUT BOARD SCHEMATICCIRCUIT SCHEMATIC Green probe is for DSO and red probe is for DMM I am trying to create project using ESP 32 with arduino IDE which turns on when a snap is detected. I will ...
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2 answers
128 views

finding microphone specification

How to find output voltage of microphone when sensitivity given is -38dBV . I want to compare volatges for various Sound pressure level. Link of datasheet is : https://store.invensense.com/...
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3 votes
1 answer
249 views

Can I connect a MEMS mic directly to this spectrum analizer chip?

I have a ICS-40181 MEMS mic and want to do basic spectral analysis using the popular MSGEQ7 chip for the purpose of a sound reactive project. Can I simply connect one into the other (with cap/res as ...
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1 answer
456 views

How to check if MEMS microphone is working?

I am using a MEMS microphone that I got from Digi Key ( Part Number: 1428-1021-1-ND). I soldered the mic on a PCB board using hot-air and then add an amplifier to increase the gain (Operational ...
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1k views

I2S Connections - MEMS Digital Microphone, CODEC, and Raspberry Pi Zero W

I have a MEMS Digital Microphone with PDM output. I am planning to use this: http://www.st.com/content/ccc/resource/technical/document/datasheet/57/af/88/31/7b/59/4f/77/DM00111225.pdf/files/...
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1 vote
2 answers
958 views

Understanding digital MEMS microphone sensitivity and obtained bits for a given input SPL

I'm trying to understand /simulate the communication between 2 smartphones by means of ultrasounds. As this is a general study I'm considering that the smartphones are equipped with the "typical" most ...
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  • 361
2 votes
1 answer
973 views

Polar pattern of typical speakers and microphones found in smartphones

I'm interested in knowing how is the directivity of the typical microphones and loudspeakers found in smartphones and tablets affected as they operate in the near ultrasound region (18-21 kHz). Near ...
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  • 361
-2 votes
1 answer
749 views

Biasing analog MEMS microphone [closed]

I am using a analog type MEMS microphone.(SMA120). Interface chip PCM2912 provi SMA100 data sheet PCM2912a data sheet PCM2912 product page not for new designs Could you kindly suggest me a proper ...
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1 vote
1 answer
2k views

how to solder MEMS microphone to PCB at home? [closed]

I would like to experiment with audio applications using MEMS microphone. The problem is i cannot think of a way to solder these microphones on a pcb as PCB prototype manufacturers that i know won't ...
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-1 votes
1 answer
552 views

I2S output to a sound card

I followed this tutorial on building a microphone with two MEMS mics and a cheap USB sound card - it works pretty well, although I'm looking to upgrade the MEMS mics to some with better SNR and ...
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3 votes
3 answers
11k views

Microphone connection diagram

I am trying to replicate project Jasper of raspberry pi. Currently I am using a USB to audio converter (shown in image below) and a regular PC mic. However the audio reception range is very small. So, ...
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  • 7,532
0 votes
2 answers
1k views

Noisy record for STMicroelectronics MP45DT02 digital mems microphone

I bought STM32F4DISCOVERY board and I developed a software that records .wav file using MP45DT02 MEMS microphone on this board. .wav files that I record are really good (almost no noise). I designed ...
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2 votes
1 answer
414 views

Can I connect my ADMP401 straight to my computer's microphone jack?

So I'm looking to get a bit more value out of this little 'ol microphone I have. It has a Vcc, GND, and an analog data port on the breakout board. Could I splice a 3.5 mm jack wire and connect the ...
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2 votes
1 answer
1k views

Testing an I2S slave device

i have a MEMS mic with digital I2S output. What is the easiest way to test that my microphone communicates right? No need to verify the sound, i just need to verify on bit level that communication ...
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1 vote
1 answer
2k views

I2S interface ideas for multiple MEMS microphones

I plan on forming a microphone array with 4 MEMS microphones and doing the signal processing(beamforming) in matlab/C on my PC. MEMS mics i use have Digital I²S interface with high precision 24 bit ...
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  • 53
0 votes
1 answer
2k views

How can use MP45DT02 and CS43L22 DAC with STM32F4?

I'm doing an application with MP45DT02 MEMS audio sensor omnidirectional digital microphone. I'd like to use a STM32F4 MCU to control it, but I don't know much about it. Can I take input from the ...
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1 vote
0 answers
176 views

Best possible specs for a MEMS mic in 2014?

I want to use the best MEMS mic that's on the market today (June 2014) in terms of audio quality. Since I know that "shopping" questions are forbidden, I'll phrase it like this: What are considered ...
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