SPL Measurement Experiments
This article will describe some experiments with measuring SPL from test signals played into our microphone through a headphone. This …
Tag Archives: MEMS
Performance of our PDM to PCM process in the LPC812
This article will discuss instrumenting the PDM to PCM conversion running in the LPC812, and report on the performance achieved. …
Improved audio recording from the PDM microphone connected to an LPC812
This post continues experimenting with recording audio converted from PDM to PCM in an LPC812 CPU. The last installment passed …
Recording PCM audio from the PDM microphone connected to an LPC812
This post continues experimenting with the PDM conversion to PCM samples in an LPC812 CPU. From the earlier tests we …
Testing the PDM to SPL arithmetic
Since porting the PDM microphone SPL measurement code base from the ATTiny85 to the ARM based LPC8xx family, it would …
PDM to SPL Demonstrated in an LPC810
This post demonstrates the SPL meter described earlier running in an NXP LPC810 ARM CORTEX-M0+ microprocessor. The computed SPL level …
PDM in another 8-pin CPU
This post explores interfacing a PDM microphone with an NXP LPC810 ARM CORTEX-M0 microprocessor, taking advantage of its existing peripherals …
PDM in ATTiny85 Source Code
This is part of a series of articles on the general subject of audio signal processing from air to information. …
Resolution of audio recovered from a PDM data stream
This is part of a series of articles on the general subject of audio signal processing from air to information. …
PDM in a Tiny CPU
This is part of a series of articles on the general subject of audio signal processing from air to information. …
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