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[New Feature] Add web folder to support web documentation

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Rudy Haryanto
2022-10-04 20:17:17 +07:00
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---
id: harmonics-to-noise-ratio
title: Harmonics-to-noise Ratio (HNR)
---
The harmonics-to-noise ratio (HNR), a common measurement of aspiration, quantifies the amount of additive noise in the voice signal.[^1]
[^1]: Ferrand, C. T. (2002). Harmonics-to-noise ratio: an index of vocal aging. Journal of voice, 16(4), 480-487.
## Raw Variables
| Variable | Description |
| ----------- | ----------- |
| `aco_hnr` | **Harmonics-to-noise ratio.** Frame-wise measurements of harmonics-to-noise ratio. |
## Derived Variables
| Variable | Description |
| ----------- | ----------- |
| `aco_hnr_mean` | **Harmonics-to-noise ratio mean.** Mean of `aco_hnr` across the audio file. |
| `aco_hnr_stdev` | **Harmonics-to-noise ratio standard deviation.** Standard deviation of `aco_hnr` across the audio file. |