pre_proc: Pre-processing function

In wltcwpf/hvsrProc: An R package for horizontal-to-vertical spectral ratio processing and calculation

Pre-processing function

Description

This function pre-process time series (noise). The pre-processing includes mean removal, Taper, and Butterworth filter

Usage

pre_proc(
  ts,
  dt,
  detrend = 1,
  taper_flag = TRUE,
  t_front,
  t_end,
  filter_flag = TRUE,
  fc,
  nPole,
  is_causal,
  order_zero_padding
)

Arguments

ts	An array of time series
dt	The time step
detrend	The indicator specifies which detrend method is used. 0: no detrend; 1: mean removal; 2: linear trend removal.
taper_flag	The flag indicates if Taper is applied
t_front	A number, the percentage of taperring for the beginning of the time series
t_end	A number, the percentage of taperring for the end of the time series
filter_flag	The flag indicates if filter is applied
fc	The corner frequency for low-pass/high-pass
nPole	The parameter for the order, where the order is 2 * nPole. Positive for low-pass; Negative for high-pass Generally, nPole = 4 for low-pass and nPole = -5 for high-pass
is_causal	A binary to indicator if causal is applied. Apply causal if is_causal = TRUE and apply acausal if is_causal = FALSE
order_zero_padding	The order needs to be added for zeroes padding at the end of recordings to increase the number of data points to a power of 2 (Kishida T., Darragh R.B., Chiou B.S.J., Bozorgnia Y., Mazzoni S., Contreras V., Boroschek R., Rojas F., Stewart J.P., 2020. Chapter 3: Ground Motions and Intensity Measures, in Data Resources for NGA-Subduction Project, PEER Report 2020/02, J.P. Stewart (editor), Pacific Earthquake Engineering Research Center, UC Berkeley (headquarters).)

Value

The filtered time series

wltcwpf/hvsrProc documentation built on March 25, 2024, 7 p.m.