Analog and audio

Is this due to noise, common mode voltage, or the PWM edges? Any recommendations to improve the circuit?

I have been studying the x-cube-memsmic1's AMicArray_Microphones_Streaming example. I have used 4 channel mic array expansion module. As per the theory, incoming data is from 4 channels, 16-bit slot size per channel, and 96khz sampling frequency. so the incoming data per millisecond should be of size 96000/1000 * 4 = 384 (uint16_t). However, in the demo example, the AUDIO_OUTPUT_BUFF_SIZE  has doubled the intended buffer size. #define AUDIO_OUTPUT_BUFF_SIZE ((AUDIO_IN_SAMPLING_FREQUENCY/1000)*AUDIO_IN_CHANNELS*2)My question is how the AUDIO_OUTPUT_BUFF_SIZE is calculated here?Another question is incoming data are slot1, slot2, slot3 and slot4. and the data is in MSB first configuration with a 16-bit slot size. So can we extract per channel data in a separate buffer?How can we further process it as it is in PCM format? Is there any documentation available for general steps to follow?

Hi team,In my application i need to drive an external speaker (Mono Head phone speaker like telephone speaker)cable length could be up to 30mtr away from the speaker amplifier(Class-AB) and i need to drive both the single ended and differential outputs Please suggest any Class-AB amplifiers from the ST to satisfy my requirements Thank you

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I found this deceder STA020DJTR and I would like to know if it is possible to replace.

Hello, I'm having problems with the circuit using TDA7498MV. I have made a PCB as recommended in the datasheet. I have connected 3v3 to MUTE and STBY pins, and a power supply of 30V to power pins.On the VDDS pin I get an output of 3v3 and on SYNC LK pin I get a clock signal of 620 kHz.But when I put on the input IN P pin (single-ended input configuration) 5 kHz 1Vpp signal I get nothing on the output. i don't know what could be wrong. I tried different input voltages (Vpp) of the sin wave but the problem is still the same. The DIAG pin is at 3.3V. Does this mean that any of the protections is activated? But I don't know why it would be. Can you please give me any suggestions about my problem?Thanks, Ales

When I read the STuW81300 datasheet, I learned to need to use 10uF and small resistance at the output of LDO. I will share the Application Diagram below this. But when I read the UM2218 User manual, I saw the bellow figure.I don't know if I need that many links.I am waiting for your comments and help.

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More Detail,But i found some other transducer which operates in different range than ST 7540. So my question is that is there any way to modulate FSK signal (centre freq 60 khz) to another centre freq. directly without demouldate and modulate again.Or is there any underwater acoustic transducer which is suitable for ST 7540.Thank you

i want to convert 0-10V in to 0-3.3V linearly for analogue input of STM32 MCU so for this application any op-amp circuit which can done this?

I am designing usb audio card, according to a scheme similar to stm32f469i-disco. Everything works great with the headphones. But when I switch to the speaker mode, there is noise in the speaker. There is noise even when I set the mute mode in the SPKxVOL [7: 0] register. Please help!

channel sampling, then calculate those parameters until 16.5 ms found. The problem is kinda impossible to get 16.5 ms even I tried to adjust those parameter. anyone has a clue? Iam using STM32F407VGx

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Hi STMicroelectronicsTeam,We want to integrate the MP34DT05TR-A with Beaglebone Black device. We have hardware in place. We couldn't find any related software to integrate MP34DT05TR-A with Linux OS. Here I am attaching the module schematic with processor connection. Please find the attached image. Can you help us in providing the software or related any related documents?Help in this will be appreciated. Thanks in advance. Thanks & Regards,Jay Kaneria

to decrease output noise, can I use 16db gain to drive 4ohm or 8ohm speaker with tweeter in low volume. "Selectable gain 26 dB /16 dB (for low noise line output function)" in datasheet but no only shown.

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I have to develop a project for my master degree and I want to know if it will be possible to send audio data sampled by an ADC through CAN FD, and on which frequency should I sample the data.I have tried to sample at 16kHz but I cant send the data fast in order to comply with real time audio effect.