I am looking to make audio circuit

[SMeht.1]

I am looking to make audio circuit. I need suggestion for microphone followed by noise cancellation ICs.

Any help will be appreciated.

Thanks

Sudhanshu.

[Eleon BORLINI]

Hi @SMeht.1​ , you basically need a tool (analog or digital based) to implement an active noise cancellation IC with a MEMS microphone, right? I suggest you to start from the Bluecoin kit design for the HW schematic and layout, and on the FP-AUD-SMARTMIC1 C libraries if you are starting from scratch. Regards

[SMeht.1]

We want to understand MEMS better. Can someone from ST visit us. Sudhanshu Mehta Staff Engineer, R&D Stryker Stryker Global Technology Center, Tower-II, 8th Floor, Vatika Business Park, Sohna Road, Sector 49, Gurgaon -122002, India P [phone] C [phone] [e-mail] www.stryker.com<>

[Eleon BORLINI]

Hi @SMeht.1​ , thanks for the invitation and the interest :) Are you specifically interest in MEMS microphone for your application on in ST MEMS sensors in general and/or for other applications (accelerometer, gyroscope, environgmental sensors?) Regards

[SMeht.1]

Hello Eleon,

Yes I am interested only in Mems.

I was looking on ST resources. Please validate my research. I need very good quality sound and I want to remove noise from that. (If your audio processor removes noise itself, that will be good as well.)

I found following combination

1) STEVAL-MKI126V3 (ST Smart Voice)

2) STEVAL-MKI129V3 (Mems coupan)

3) STEVAL-MKI138V1 (ST audio Hub) // I feel this is required for programming audio processor STA321MP only?

Question 1: After Proof of concept, if we order STA321MP, we will get that pre-programmed or we need to program at production line?

Question 2: ST Smart Voice can give I2S output. At this I2S output, do I need another noise removing chip (may be some CODEC)? If yes, please suggest.

Question 3: My research above on ST MEMS is good for audio reception or not? i mean i need very good audio quality without noise.

If you suggest something else, please give full description.

Sudhanshu Mehta

[phone] (call me anytime)

[SMeht.1]

Do we need anything else in for making above thing working.. I need I2S output.. Rest of things i have in place.. FYI i am looking to use WT32i bluegiga module for proof of concept.

[SMeht.1]

Any suggestion will be appreciated..

[SMeht.1]

I am interested in MEMS microphones

[SMeht.1]

@Eleon BORLINI​  can you please help us on this?

[SMeht.1]

@Eleon BORLINI (ST Employee)​ 

Hello Eleon, please validate

https://www.mouser.in/ProductDetail/STMicroelectronics/STEVAL-BCNKT01V1?qs=%2Fha2pyFaduh8u%2FMN1pet5fFpLoEXe%2FZRNfHbSfK6MwR2wqsiUIt3bg==

and

https://www.mouser.in/ProductDetail/STMicroelectronics/NUCLEO-F410RB?qs=%2Fha2pyFaduj0LE%252BzmDN2WGsLI%2FSHDmqnrJvkB00UMkqt9XNS%252B5tWLg%3D%3D

are complete hardware i need for getting MEMS microphone output in I2S fotmat..

[Eleon BORLINI]

Hi @SMeht.1​ , as I wrote before, the reference design for an active noise cancelling and, better, beam-forming app is the Bluecoin tool, aka STEVAL-BCNKT01V1 (the first one you mentioned in the comment here above). The other suggested evaluation tool is the X-NUCLEO-CCA02M2. Both them can be interfaced with the tool you suggested, the NUCLEO-F410RB, that acts as master board. You can find the FW libraries for the PDM to I2S conversion in the Middlewares folder of the function pack FP-AUD-SMARTMIC1.

I suggest you not to use the STEVAL-MKI126V3 / STEVAL-MKI138V1 and related SW, because they are nrnd products and are no more supported.

[SMeht.1]

Hello @Eleon BORLINI​ 

Thanks for your reply.

As per your suggestion, i have started doing POC with STEVAL-BCNKT01V1 .

it works fine when i record sound on PC using USB.

My next action is to make it compatible with product. I want to take this audio over I2S and send this to bluegiga wt32i iwrap6 module.

I am getting challange in this.

i want to reduce following items of STEVAL-BCNKT01V1 module.

LRCLK (Word Select Clock) - 8.00 kHz

BCLK (Bit Clock) - 385 kHz

I can compile code. Can you suggest how to lower this. I am using STM32CubeFunctionPack_SMARTMIC1_V2.0.0.

other wise voice on other side of Bluegiga module is cracking.

Thanks

Sudhanshu Mehta