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Vibrato Depth seems to decrease as Ratio approaches 0
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November 28, 2017
8:26 pm
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MattCaimi
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Hi Will,

In chapter 10 of the Audio Effects book you talk about making a vibrato. I've implemented my own vibrato with a delay modulated by an LFO and it seems like depth decreases as rate gets really low. In fact at 0.3 Hz and below pitch sounds constant to my ears.

I even tested with a tuner app on my phone. A sine wave at middle C (261.6 Hz) played through the vibrato only oscillates between 261.4 Hz and 261.9 Hz with a vibrato rate of 0.1 Hz and a depth equal to 3ms of delay at peak LFO oscillation. With the same depth but a vibrato rate of 0.4 Hz I measured the 261.6 Hz sine wave oscillating between 260.9 Hz and 262.5 Hz.

Is this expected behavior that a vibrato will have a weaker range at very slow rates? I found that even increasing the depth did little to increase the oscillation range.

Thanks,

Matt

November 28, 2017
11:48 pm
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MattCaimi
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I thought about this more and I think it makes sense to me now. The pitch range the vibrato oscillates between would depend on the LFO rate. As the read index sweeps through the delay buffer that is what causes the pitch to rise and fall.

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