Free Electronic Circuit Design
The PDM (pulse-density modulation) has been widely used in the current technology of audio signal conversion (from analog to digital) because its simplicity while achieving high quality conversion. This technology is widely used in digital microphone, and it is basically a sigma delta modulator circuit which is used in many modern audio codec chip as well. It is an interesting […]
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Why ESP-IDF, C++, and Windows First of all, choosing the ESP-IDF frameworks is the best choice in terms of complete supports for all ESP32 peripherals’s functionality, because it’s the official framework released by the chip’s maker (Espressif). This choice is very important for long term projects, where “investing in time” is unavoidable to manage many things. Secondly, it might be […]
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Since the release of ESP32 by Espressif, many application-specific modules based on this chip are produced. For example, Ai-Thinker produce image processing module with artificial intelligence support for image recognition. In the audio processing area, one interesting product by Ai-Thinker is the ESP32-A1S module. Because of the integrated AC101 codec inside, this module enable very compact and low cost solution […]
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