cwtfreqbounds
CWT maximum and minimum frequency or period
Syntax
Description
[
returns the minimum and maximum wavelet bandpass frequencies in cycles/sample for a
signal of length minfreq
,maxfreq
] = cwtfreqbounds(N
)N
. The minimum and maximum frequencies are
determined for the default Morse (3,60) wavelet. The minimum frequency is determined
so that two time standard deviations of the default wavelet span the
N
-point signal at the coarsest scale. The maximum frequency
is such that the highest frequency wavelet bandpass filter drops to ½ of its peak
magnitude at the Nyquist frequency.
[
returns the bandpass periods for the sampling period maxperiod
,minperiod
] = cwtfreqbounds(N
,Ts
)Ts
.
maxperiod
and minperiod
are scalar
durations with the same format as Ts
. If the number of standard
deviations is set so that log2(maxperiod/minperiod) < 1/NV
where NV
is the number of voices per octave,
maxperiod
is adjusted to minperiod ×
2^(1/NV)
.
[___] = cwtfreqbounds(___,
returns the minimum and maximum wavelet bandpass frequencies or periods with
additional options specified by one or more Name=Value
)Name=Value
arguments. For example, [minf,maxf] =
cwtfreqbounds(1000,TimeBandwidth=30)
sets the time-bandwidth parameter
of the default Morse wavelet to 30.
Examples
Input Arguments
Name-Value Arguments
Output Arguments
Extended Capabilities
Version History
Introduced in R2018a