Important Tip for RealSpeak Samantha, Serena and Tom Voice Users

July 30, 2008 at 9:48 pm | Posted in RealSpeak, text to speech, Text2Go, Uncategorized | 1 Comment

The other day I needed to splice some voice samples together for my post on RealSpeak Voice Pronunciation. I was using the free audio editing tool Audacity and happened to notice something disturbing about the waveform that had been generated. I was using the RealSpeak Samantha voice and it was quite clear that a certain amount of audio clipping had occurred.

You can see this in the regions I’ve highlighted in red, where the natural shape of the waveform looks to be cutoff or clipped.

If we zoom right in so the individual waves are visible, you can clearly see that each peak has been chopped off.

Does this matter?

Yes. I’m no audio expert but we’re actually throwing away part of the signal and this will produce some audio distortion.

Can it be fixed?

Yes. The fix is as simple as adjusting the volume of the voice (don’t confuse this with the volume on your PC). You can adjust the volume of an individual voice using the Text2Go Options page. By default, the volume of all voices is set to Normal. By lowering this a couple of notches, the output for Samantha will no longer be clipped.

Ideal Volume Setting for RealSpeak Samantha

Converting the same text to speech produced the following waveform.

Samantha Waveform with Correct Volume Setting

You can see that the waveform is no longer clipped at the top or the bottom.

Samantha Waveform Closeup with Correct Volume Setting

Similarly, when we zoom in, each peak is nicely rounded and no longer chopped off.

Do other RealSpeak Voices suffer the same problem?

Serena and Tom also suffer some clipping, so if you use these voices make sure you adjust the volume setting down one or two notches. The other RealSpeak voices are not clipped at the Normal volume setting and don’t need to be adjusted.

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1 Comment

  1. […] Important Tip for RealSpeak Samantha, Serena and Tom Voice …Jul 30, 2008 … I was using the RealSpeak Samantha voice and it was quite clear that a certain amount of audio clipping had occurred. You can see this in the … […]


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