# This code is based on the Matlab implementations of PLP and Rasta
# feature calculations by Daniel P. W. Ellis of Columbia University /
# International Computer Science Institute. For more details, see:
# http://www.ee.columbia.edu/~dpwe/resources/matlab/rastamat/
hz2bark <- function(f){
if(!is.numeric(f) || f < 0)
stop("frequencies have to be non-negative")
# Inverse of Hynek's formula (see bark2hz)
6 * asinh(f/600)
}
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