octaves {seewave}

Octave values

Description

This functions returns the frequency values of the octaves below and above a specific frequency

Usage

octaves(x, below = 3, above = 3)

Arguments

x

a numeric vector, frequency of the note in Hz or kHz.

below

the number of octaves below x.

above

the number of octaves above x.

Value

A numeric vector with the octave series in frequency (Hz or kHz depending on x unit).

Author(s)

Jerome Sueur

See Also

notefreq

Examples

names <- c("C","D","E","F","G","A","B")
values <- c(261.63, 293.66, 329.64, 349.23, 392, 440, 493.88)
res <- sapply(values, FUN=octaves)/1000
op <- par(las=1,mfrow=c(2,1))
par(mar=c(0,4,1,1))
matplot(x=1:7, y=res, t="o", pch=names, xlab="",
    ylab="Frequency (kHz) [linear scale]", col=rainbow(7), xaxt="n")
par(mar=c(4.5,4,0,1))
matplot(x=1:7, y=res, t="o", pch=names, xlab="Octave",
    ylab="Frequency (kHz) [log scale]", col=rainbow(7), ylog=TRUE, log="y")
par(op)