Julia

using PortAudio, WAV

# Parameters
fs = 44100  # Sample rate (Hz)
duration = 2  # Duration (seconds)
f = 220  # Frequency of the sine wave (Hz)

# Generate sine wave
t = 0:1/fs:duration  # Time vector
y = 0.5 * sin.(2 * pi * f * t)  # Sine wave signal

# Save as .wav file
WAV.wavwrite(y, fs, "audio220.wav")

# Play the audio using a Windows-based audio player (like VLC or feh in WSL)

This is a simple, enjoyable program for beginners to Julia and it's easy to change the values for different results.

I always use a Linux terminal when I'm programming. When I'm on my Windows laptop, I use WSL. WSL doesn't have access to the Windows 10 sound applications, so for this program I opted to simply have it create a .wav file. Then if I'm on Linux or Win 10, I can simply play the .wav with VLC.

You will need Julia installed on your PC and for this program, you'll need the WAV package. Because I am creating a standalone .wav file and not trying to play the created .wav file through the PC, PortAudio isn't used.

In an upcoming article we're going to plot an audio waveforms using the Plots package. Going forward, we'll analyze some waveforms with FTT (Fast Fourier Transform).

Ben Santora - October 2024