How to remove pops from concatented sound data in PyAudio

Question

How do you remove \"popping\" and \"clicking\" sounds in audio constructed by concatenating sound tonal sound clips together?

I have this PyAudio code for generating

Answer 1

If you are concatenating clips of varying attributes, you may hear clicking sound if peaks of two clips at the points of concatenation does not align.

One way to get around this is to do Fade-out at the end of first signal and then fade-in at the beginning of second signal. then continue this pattern through rest of the concatenation process. Check here for details on Fading.

I would try out concatenation in visual tools like Audacity , try Fade-out and fade-in on clips you want to join and play around with timing and settings to get desired results.

Next, I am not sure pyAudio has any easy way of implementation fading, however, if you can , you may want to try pyDub. It provides easy ways to manipulate audio. It has both Fade-in and Fade-out methods as well as cross-fade method, which basically performs both fade in and out in one step.

You can install pydub as pip install pydub

Here is a sample code for pyDub:

from pydub import AudioSegment
from pydub.playback import play

#Load first audio segment
audio1 = AudioSegment.from_wav("SineWave_440Hz.wav")

#Load second audio segment
audio2 = AudioSegment.from_wav("SineWave_150Hz.wav")

# 1.5 second crossfade
combinedAudio= audio1.append(audio2, crossfade=1500)

#Play combined Audio
play(combinedAudio)

Finally, if you really want to get noise / pops cleared at a professional grade, you may want to look at PSOLA (Pitch Synchronous Overlap and Add) . Here one would convert audio signals to frequency domain and then perform PSOLA on chunks to merge the audio with minimum possible noise.

That was long, but hope it helps.