Phil Schatzmann

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Machine Sound

Arduino

ADPCM and WAV Files

At the very beginning of my Arduino AudioTools project, I was providing a codec for WAV files. It was just handling PCM audio, so it just needed to read or write the header and then could just copy the audio data. In my last blog, I was writing that the Read more…

By pschatzmann, 2 weeks21. May 2023 ago
Arduino

Fast Audio Codecs for Microcontrollers

My AudioTools project is supporting quite a few audio encoders and decoders. They are critical to reduce the storage or transmission volume of audio. Though I support the encoding of AAC and MP3, I can’t really recommend this: it requires a lot of memory and processing time. For an introduction Read more…

By pschatzmann, 4 weeks10. May 2023 ago
Arduino

ArduinoAudioTools: Playing Movies ?

In my last post I was writing about audio containers. But containers are usually also used to mux audio and video together in one file. This made me think, if we could play movies on an ESP32? In fact there are some projects out there that exactly do this: They Read more…

By pschatzmann, 1 month6. May 2023 ago
Arduino

ESP32 Memory Management: floats and MALLOC_CAP_32BIT

We can dynamically allocate memory with malloc() or use the dedicated ESP32 specific functions. In general we need to use byte aligned allocations (MALLOC_CAP_8BIT). When we have used up all available memory space, we still have 4 byte aligned memory available that we can use to store arrays of int32_t Read more…

By pschatzmann, 2 months11. April 2023 ago
Arduino

Arduino Audio Tools – RTSP Revisited

Quite some time ago, I was describing how we can stream audio with the help of RTSP. In that example we needed to provide a data stream from which we can read the audio! This is not very flexible and often we want to specify RTSP as output: e.g. in Read more…

By pschatzmann, 2 months2. April 2023 ago
Arduino

Mozzi and the AudioKit – Reading Audio Data

I have extended the I2S interface in Mozzi, so that we can can use the getAudioInput() which reads the audio via I2S: This can be used e.g. by the AudioKit. Until this change has been merged, you need to use my extended project. Mozzi brings your Arduino to life by Read more…

By pschatzmann, 3 months10. March 2023 ago
Arduino

Playing Commodore 64 SID Audio Files on Microcontrollers or the Desktop

In the old days I was rather a Commodere PC guy, but I know of colleagues of mine that were addicted to the Commodore 64 and knew it inside out. So, here is another project that makes you feel nostalgic: Sound Interface Device (SID) is a audio format used by Read more…

By pschatzmann, 3 months6. March 2023 ago
Arduino

Arduino AudioTools: ESP32 vs RP2040 Pico W

I thought it might be interesting to compare the Rasperry Pico W with the ESP32. While the ESP32 provides faster numeric operations, I did not have any visibility how these two microcontrollers compare in regard of the WIFI speed. The good news is, that the URLStream from the AudioTools library Read more…

By pschatzmann, 3 months28. February 2023 ago
Arduino

The Colours of Noise

Recently somebody asked me to provide some pink noise! I knew about white noise, but I did not know that noise can come in different colors. So this is the perfect opportunity to play around with noise.

By pschatzmann, 3 months26. February 2023 ago
Arduino

Using Mozzi with the AudioKit

Mozzi brings your Arduino to life by allowing it to produce much more complex and interesting growls, sweeps and chorusing atmospherics. These sounds can be quickly and easily constructed from familiar synthesis units like oscillators, delays, filters and envelopes. The AudioKit is a cheap ESP32 based audio board that usually Read more…

By pschatzmann, 3 months25. February 2023 ago

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Phil Schatzmann
Rue du Biais 24 B
1957 Ardon
Switzerland

phil.schatzmann@gmail.com

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