esp-adf/examples/audio_processing/pipeline_resample

Record and Playback with Resample

When [Rec] button on an audio board is pressed, this example will record, and when the button is released, it will play back the recorded file.

For the Recorder:

• We will set up I2S and get audio at sample rate 48000 Hz, 16-bits, 2 channel.
• Using resample-filter to convert to 16000 Hz, 16-bits, 1 channel.
• Encode with Wav encoder
• Write to microSD

For the Playback:

• We will read the recorded file, with sample rate 16000 Hz, 16-bits, 1 channel,
• Decode with WAV decoder
• Using resample-filter to convert to 48000 Hz, 16-bits, 2 channel.
• Write the audio to I2S

Compatibility

ESP32-LyraT	ESP32-LyraT-MSC

Usage

Prepare the audio board:

• Connect speakers or headphones to the board.
• Insert a microSD card.

Configure the example:

• Select compatible audio board in menuconfig > Audio HAL.

Load and run the example:

• By using [Rec] button on the ESP32-LyraT board, when the button is pressed, it will start recording, and when the button is released, it will play back the recorded file.
• To stop the pipeline press [Mode] button on the ESP32-LyraT board.