seewave (version 2.2.3)

mel: Hertz / Mel conversion

Description

This function converts Hertz data in Mel data.

Usage

mel(x, inverse = FALSE)

Value

A corresponding R object is returned.

Arguments

x

a value in Hertz (or in Mel if inverse is TRUE)

inverse

logical, if TRUE converts the Mel data in Hertz data.

Author

Jerome Sueur

Details

Hertz to mel conversion is computed according to:
$$m = 1127.01048 \times {\log{(1+(\frac{f}{700}))}}$$ with m in Mel and f in Hertz.

Mel to Hertz conversion (when inverse is TRUE) is therefore computed according to:
$$f = 700 \times{(e^{\frac{m}{1127.01048}}-1)}$$ with f in Hertz and m in Mel.

References

Stevens, S. S., Volkman, J. and Newman, E. B. 1937. A scale for the measurement of psychological magnitude pitch. Journal of the Acoustical Society of America, 8: 185-190.

See Also

melfilterbank

Examples

x<-seq(0,10000,by=50)
y<-mel(x)
plot(x,y,type="l",xlab = "f (hertz)", ylab = "f (mel)",
  main = "Mel scale", col="red")