Realtime Audio Visualization and Fast Fourier transform

Description

A Realtime Audio Visualization in Python using a Raspberrypi a Sense HAT and a USB microphone. On this script i use a USB microphone to get the audio, then calculate Fast Fourier transform to represent in the 8 x 8 RGB LED matrix,

The Sense Hat is an add-on board for Raspberry Pi, made especially for the Astro Pi mission. The Sense HAT has an 8×8 RGB LED matrix, a five-button joystick and includes the following sensors:

• Gyroscope
• Accelerometer
• Magnetometer
• Temperature
• Barometric pressure
• Humidity

Instalation

git clone https://github.com/rfiestas/audio_visualization_fft.git

also:

• sense-hat, python module to control the Raspberry Pi Sense HAT.
• alsa audio, provides audio and MIDI functionality to the Linux operating system.
• colour, converts and manipulates various color representation (HSL, RVB, web, X11, ...).
• numphy, is the fundamental package for scientific computing with Python.

Usage

Launch this script with any root rights user, Press Contol + C, to stop script.

audio_visualization_ttf.py

Show sound cards.

# ./audio_visualization_fft.py --show-cards

Select sound card.

# ./audio_visualization_fft.py --card Device

Notes:

• Alsa Audio need libasound2-dev

Troubleshooting:

I can't change setperiodsize, It's automatically calculated, based on rate and numbers of chanels. it's neccessary get a data lenght multiple of 8, to represent in the screen.