arduino-audio-tools/examples/examples-stream/streams-tf-i2s

Generating Audio with Tensorflow Liete

The starting point is the good overview provided by the "Hallo World" example of Tensorflow Lite which describes how to create, train and use a model which based on the sine function.

We just send a generated sine wave to the I2S interface. Further information can be found in the Wiki Please note the log level should be set so that there is no disturbing output!

External DAC:

For my tests I am using the 24-bit PCM5102 PCM5102A Stereo DAC Digital-to-analog Converter PLL Voice Module pHAT

I am just using the default pins defined by the framework. However I could change them with the help of the config object. The mute pin can be defined in the constructor of the I2SStream - by not defining anything we use the default which is GPIO23

DAC	ESP32
VCC	5V
GND	GND
BCK	BCK (GPIO14)
DIN	OUT (GPIO22)
LCK	BCK (GPIO15)
FMT	GND
XMT	3V (or another GPIO PIN which is set to high)

• DMP - De-emphasis control for 44.1kHz sampling rate(1): Off (Low) / On (High)
• FLT - Filter select : Normal latency (Low) / Low latency (High)
• SCL - System clock input (probably SCL on your board).
• FMT - Audio format selection : I2S (Low) / Left justified (High)
• XMT - Soft mute control(1): Soft mute (Low) / soft un-mute (High)

Dependencies

You need to install the following libraries:

• https://github.com/pschatzmann/arduino-audio-tools
• https://github.com/pschatzmann/tflite-micro-arduino-examples