/vu_meter

Volume Unit meter using 96Boards CE

Primary LanguageCOtherNOASSERTION

vu_meter

Volume Unit meter (VU meter) is an application used to monitor the intensity of sound using ALSA programming interface for linux. There are two variants of this application:

  1. Using dB (decibels)
  2. Using FFT (Fast Fourier Transform)

Table of Contents

1. Using dB:

Here, the intensity of sound is calculated by computing RMS value of sampled audio signal and converting to dB. The implementation is straight forward and simple.

Link to blog: http://www.96boards.org/blog/96boards-vu-meter-part-1/

2. Hardware requirements:

  1. HiKey development board
  2. USB mic

3. Package Dependencies

  1. ALSA library
$ sudo apt-get install libasound2

4. Building and Running:

$ git clone https://github.com/96boards-projects/vu_meter.git
$ cd projects
$ cd vu_meter
$ make
$ ./vu_meter plughw:U0x46d0x825

Replace the Sound card info according to your device

5. Conclusion:

Running the executable causes progress bar to move according to the sound intensity.

Using FFT:

Under development