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

My initial suspicion that the individual waveforms weren't aligning was correct, which I confirmed by inspecting in Audacity. My solution was to modify the code to start and stop each waveform on the peak of the sine wave.

def tone(self, frequency, length=1000, play=False, **kwargs):

    number_of_frames = int(self.bitrate * length/1000.)

    record = False
    x = 0
    y = 0
    while 1:
        x += 1
        v = math.sin(x/((self.bitrate/float(frequency))/math.pi))

        # Find where the sin tip starts.
        if round(v, 3) == +1:
            record = True

        if record:
            self._queue.append(chr(int(v*127+128)))
            y += 1
            if y > number_of_frames and round(v, 3) == +1:
                # Always end on the high tip of the sin wave to clips align.
                break