Parameters: | filter (list of str, optional) Filter list. List order matters because each filter
operation is performed in the order given. For example
filter=["demean", "lp=2.0"] will demean and then apply a
low-pass filter, while filter=["lp=2.0", "demean"] will apply
the low-pass filter first, and then demean.
- "taper=WIDTH,TYPE"
- Apply a time domain symmetric tapering function to the
timeseries data. The width is specified as a fraction of the
trace length from 0 to 0.5. The window types HANNING (default),
HAMMING, or COSINE may be optionally followed, e.g.
"taper=0.25" or "taper=0.5,COSINE".
- "envelope=true"
- Calculate the envelope of the time series. This calculation
uses a Hilbert transform approximated by a time domain filter.
- "lp=FREQ"
- Low-pass filter the time-series using an IIR 4th order filter,
using this value (in Hertz) as the cutoff, e.g. "lp=1.0".
- "hp=FREQ"
- High-pass filter the time-series using an IIR 4th order filter,
using this value (in Hertz) as the cutoff, e.g. "hp=3.0".
- "bp=FREQ1,FREQ2"
- Band pass frequencies, in Hz, e.g. "bp=0.1,1.0".
- "demean"
- Remove mean value from data.
- "scale"
- Scale data samples by specified factor, e.g. "scale=2.0"
If "scale=AUTO", the data will be scaled by the stage-zero
gain. Cannot specify both scale and divscale.
Cannot specify both correct and scale=AUTO.
- "divscale"
- Scale data samples by the inverse of the specified factor, e.g
"divscale=2.0". You cannot specify both scale and
divscale.
- "correct"
- Apply instrument correction to convert to earth units. Uses
either deconvolution or polynomial response correction. Cannot
specify both correct and scale=AUTO. Correction
on > 10^7 samples will result in an error. At a sample rate of
20 Hz, 10^7 samples is approximately 5.8 days.
- "freqlimits=FREQ1,FREQ2,FREQ3,FREQ4"
- Specify an envelope for a spectrum taper for deconvolution,
e.g. "freqlimits=0.0033,0.004,0.05,0.06". Frequencies are
specified in Hertz. This cosine taper scales the spectrum from
0 to 1 between FREQ1 and FREQ2 and from 1 to 0 between FREQ3
and FREQ4. Can only be used with the correct option. Cannot be
used in combination with the autolimits option.
- "autolimits=X,Y"
- Automatically determine frequency limits for deconvolution,
e.g. "autolimits=3.0,3.0". A pass band is determined for
all frequencies with the lower and upper corner cutoffs defined
in terms of dB down from the maximum amplitude. This algorithm
is designed to work with flat responses, i.e. a response in
velocity for an instrument which is flat to velocity. Other
combinations will likely result in unsatisfactory results.
Cannot be used in combination with the freqlimits option.
- "units=UNIT"
- Specify output units. Can be DIS, VEL, ACC or DEF, where DEF
results in no unit conversion, e.g. "units=VEL". Option
units can only be used with correct.
- "diff"
- Differentiate using 2 point (uncentered) method
- "int"
- Integrate using trapezoidal (midpoint) method
- "decimate=SAMPLERATE"
- Specify the sample-rate to decimate to, e.g.
"decimate=2.0". The sample-rate of the source divided by
the given sample-rate must be factorable by 2,3,4,7.
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