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Q&A from Analog Devices EngineerZone: SigmaDSP/SigmaStudio and DSP discussions (14 topics).
14 topics · 61 messages
Filtered by: #pdm ✕
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PDM output
Hi We are trying to route a signal from FDSP channel 2 to PDM output, but the only thing we see on the PDM output is noise. Changing to routing to a different FDSP or SDSP channel does not seem to hav
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Slave mode of clock for PDM interface
Hello. Everyone. Thank you for your help. I am trying to set the slave mode of clock for the PDM interface with ADAU1787. But what I can only find in SigmaStudio is the clock for the PLL. It will be m
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PDM microphone(s) configuration issue
Hello, I'm trying to configure two PDM mics with FiHiberry DSP DAC board (ADAU1452 SigmaDSP + PCM5102A DAC) These are SPM1423HM4H-B, and the SELECT pin is grounded in the boards I have, so I try to us
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Another 1787 PDM question please
I'm trying to implement a very simple setup: PDM mic inputs on the ADAU1787 eval board to an analogue output, see this project:1787 PDM TEST.dspproj Problem is it isn't working. I've read the previous
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Not able to hear output sound using NR example for ADAU1467
Hi everyone I want to use ANC feature using ADAU167 I have bought PDM mic for input. So at first I was testing with single mic and pair of headphones Here is my setup PDM mic connections CLK -> BCLK_I
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ADAU1787 DMIC input noise floor increase high
Hi Guys, I use AP to test the DMIC input path, AP generate a PDM signal to ADAU1787 DMIC input and monitor the HP out. I find that the noise floor increase high when using a PDM signal above -7dBFS. T
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PDM microphone clock frequency settings and left, right channels data
Hi Team, Two more questions on this subject. 1) PDM microphones that are connecting to the J2 LRCLK_IN2 and J2 BCLK_IN2 pins on the EVAL-ADAU1452 board. The PDM microphones have 2.4 MHz typical freque
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One LEFT digital PDM microphone input but signal goes to both LEFT and RIGHT outputs
Hi Team, Please help. I am connecting only one digital PDM microphone to the LRCLK_IN2 and BCLK_IN2 on PDM channel 0 (with LR selection signal raised for LEFT side in my digital microphone) but the ou
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EVAL-Adau1787Z design error?
I was trying to use connectors J6 or J7 to connect to the digital microphone inputs on the ADAU1787 eval board. After having no success, I eventually connected the microphone to J5 which worked for me
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Decimation of PDM signal on ADAU1467 / EVAL-ADAU1467Z
Hi, I am looking for a way to control signal decimation of EVAL-ADAU1467Z, while reading MEMS microphone that uses PDM output signal. Microphone is clocked 768kHz and pins used: BCLK0 - CLK LRCLK0 – D
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Getting digital microphones to work on EVAL-ADAU1777Z ?
I am trying to get a digital microphone input to work on EVAL-ADAU1777Z. I have successfully brought up examples using 4 analog input channels through the ADCs. I have some digital PDM mems microphone
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What decimation ratio
Hello Guys, I am developing PDM MEMS mic with ADAU1451. We are using 48k UltraSound Mems. What is decimation ratio on ADAU1451 PDM Mic interface? Is it adjustable? Jason Audio Signal Processors adau14
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PCM to PDM conversion
Hi guys, my is to develop a converter processor, that transforms a sound signal from PCM (I²C) to pulse density modulatoion (PDM) type. What kind of DSP or processors can you recommend for this applic
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Common Inter-IC Digital Interfaces for Audio Data Transfer
Jerad Lewis from the ADI MEMS Microphone Group has written a new technical article about selecting an appropriate digital interface for audio systems, particularly those involving microphones. The art