AudioCodec - Play and Record Wav Files

Materials

  • AmebaD [AMB23] x 1

  • MicroSD card

  • Adafruit PDM Microphone Breakout x 1 [Optional]

Example

Procedure

As AMB23 have a built in microphone on the board, there is no need for any external microphone. Copy a sample wav file into the MicroSD card for demo. (In this example, the sample name is Test_Audio_48khz_16bit_stereo.wav) Then insert the MicroSD card into the adapter at the back of the board.

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If you wish to connect a digital microphone (PDM), you may refer to the following wiring diagram.

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Example 01 - PlaybackWavFile

Open the example, “Files” -> “Examples” -> “AmebaAudioCodec” -> “PlaybackWavFile”.

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Upload the code and press the reset button on Ameba once the upload is finished. Insert earphone/speaker into the onboard jack for playing the sample sound.

Example 02 - RecordWavFile

Open the example, “Files” -> “Examples” -> “AmebaAudioCodec” -> “RecordWavFile”.

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Define a GPIO/button(Input high to active) for RECORDBTN. Define the filename[] for name of the storage wav file. In this example the name is “Test_Recording_48khz_16bit_mono.wav”.
Upload the code and press the reset button on Ameba once the upload is finished.
Input high to RECORDBTN, then record voice by on board mic. When input is low the record stops. The recorded voice will be stored in “Test_Recording_48khz_16bit_mono.wav” that located at MicroSD card.

Example 03 - RecordPlaybackWav

Open the example, “Files” -> “Examples” -> “AmebaAudioCodec” -> “RecordPlaybackWav”.

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This example is a combination of Example01 and Example02. You can record by Example02 then play it by jack as the method of Example01.
Define a GPIO/button(Input high to active) for RECORDBTN. Define the filename[] for name of the storage wav file. In this example the name is
“Test_Recording_48khz_16bit_mono.wav”.
Upload the code and press the reset button on Ameba once the upload is finished.
Input high to RECORDBTN, then record voice by on board mic. When input is low the record stops. The recorded voice will be stored in “Test_Recording_48khz_16bit_mono.wav” that located at MicroSD card.
Insert earphone/speaker into the onboard jack for playing the sample sound.