22 lines
726 B
Markdown
22 lines
726 B
Markdown
---
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id: shimmer
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title: Shimmer
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---
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The shimmer of an audio signal is the cycle-to-cycle amplitude variation of the sound wave.[^1]
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[^1]: Horii, Y. (1980). Vocal shimmer in sustained phonation. Journal of Speech, Language, and Hearing Research, 23(1), 202-209.
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## Raw Variables
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| Variable | Description |
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| ----------- | ----------- |
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| `aco_shimmer` | **Shimmer.** Frame-wise measurements of shimmer. |
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## Derived Variables
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| Variable | Description |
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| ----------- | ----------- |
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| `aco_shimmer_mean` | **Shimmer mean.** Mean of `aco_shimmer` across the audio file. |
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| `aco_shimmer_std` | **Shimmer standard deviation.** Standard deviation of `aco_shimmer` across the audio file. |
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