Audio Codec - Input FTT

This example shows how to use the FFT class to calculate the fast Fourier transform of the audio signal recorded by the microphone.

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Description

A hardware circuit that converts sound waves into PCM digital code and vice versa. The term may refer to only the A/D and D/A conversion, or it may include the compression technique for further reducing the signal (definition #1 above). If the codec is specialized for human voice, it is known as a "speech codec," "voice codec" or "vocoder" (see speech codec).

Details

Ameba RTL8722DM is a low-power dual-band WLAN and Bluetooth Low Energy SoC by Realtek. The RTL8722DM also include memory for Wi-Fi protocol functions and application making it simple for anyone to develop various kind of IoT applications. At the same time it has a wide range of peripheral interfaces. With all these interfaces, it can connect to most of the electronics components like LEDs, temperature and humidity sensors, and so on.

More Resources:

If you need additional technical documents or the source code for this project. Please visit the official websites and join the Facebook group and forum.

Ameba Official Website: https://www.amebaiot.com/en/
Ameba Facebook Group: https://www.facebook.com/groups/amebaioten
Ameba Forum: https://forum.amebaiot.com/

Components

1 × RTL8722DM_MINI Microcontroller

Build Instructions

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1

Setup

As RTL8722DM MINI have a built in microphone on the board, there is no need for any external microphone.

Next, Open the example, “Files” -> “Examples” -> “AmebaAudioCodec” -> “InputFFT”.
2

Final

Upload the code and press the reset button on Ameba once the upload is finished.
Open the serial monitor and change the baud rate to 2000000. A stream of FFT results of audio samples will be displayed. Try playing music or use a smartphone app to generate a sine wave into the microphone, and you should be able to see the FFT output change.