Abstract
Indications are provided to apply frequency filters to remove unwanted sounds according to frequency. This covers filters with predefined frequency transfer functions, as the preemphasis and Butterworth filters, and filters which cutoff frequencies can be defined by the user, that is, filters based on the short-time Fourier transform and finite impulse response (FIR) filters.
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Notes
- 1.
A preemphasis filter can also be built with the function filter() of the package signal as implemented in the function melfcc(): filter(x, filter = c(1, -alpha), method = ‘‘convolution,’’ sides = 1, circular = FALSE).
References
Butterworth S (1930) On the theory of filter amplifiers. Exp Wirel Wirel Eng 7:536–541
Speaks CE (1999) Introduction to sound. Singular Publishing Group, San Diego/London
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Sueur, J. (2018). Frequency Filters. In: Sound Analysis and Synthesis with R. Use R!. Springer, Cham. https://doi.org/10.1007/978-3-319-77647-7_14
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DOI: https://doi.org/10.1007/978-3-319-77647-7_14
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-77645-3
Online ISBN: 978-3-319-77647-7
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