B dH@sldZddlmZddlmZmZddlmZmZddlZddl Z e dZ dddZ dd d Zdd d ZdS)zYThis module contains functions to generate gaussian noise colored with a noise spectrum. )libutils) TimeSerieszeros)complex_same_precision_asFrequencySeriesN lalsimulationc Csd||jd}|dk r&tj||}t|}|dk}||}tjd|}tjd|}|d|}tjt||d} || |<t| |j|dS)al Create noise with a given psd. Return noise coloured with the given psd. The returned noise FrequencySeries has the same length and frequency step as the given psd. Note that if unique noise is desired a unique seed should be provided. Parameters ---------- psd : FrequencySeries The noise weighting to color the noise. seed : {0, int} or None The seed to generate the noise. If None specified, the seed will not be reset. Returns -------- noise : FrequencySeriesSeries A FrequencySeries containing gaussian noise colored by the given psd. g?Nry?)dtype)delta_fr) r numpyrandomseedrnormalrlenr) psdr sigmarZnot_zeroZ sigma_redZnoise_reZnoise_coZ noise_rednoisera/work/yifan.wang/ringdown/master-ringdown-env/lib/python3.7/site-packages/pycbc/noise/gaussian.pyfrequency_noise_from_psd&s  rc Cs4tt||d}|dkr$tjd}td|}td||j}|dd}|d}|t |krjt d|d |}d |j j |d<d |j j d <tt||d} d } t | d ||xp| |kr.| ||kr| j j d ||j | | |<n| j j d || |j | |<| |7} t | |||qW|S) a/ Create noise with a given psd. Return noise with a given psd. Note that if unique noise is desired a unique seed should be provided. Parameters ---------- length : int The length of noise to generate in samples. delta_t : float The time step of the noise. psd : FrequencySeries The noise weighting to color the noise. seed : {0, int} The seed to generate the noise. Returns -------- noise : TimeSeries A TimeSeries containing gaussian noise colored by the given psd. )delta_tNlZranluxg?z)PSD not compatible with requested delta_tr)rrr r randintlalZgsl_rngintr r ValueErrordatarZSimNoise) lengthrrr Znoise_tsZ randomnessNnZstridesegmentZlength_generatedrrrnoise_from_psdNs,        r!$@c CsFddl}d}td||d}|j||||}tt||||dS)a Create noise from an analytic PSD Return noise from the chosen PSD. Note that if unique noise is desired a unique seed should be provided. Parameters ---------- psd_name : str Name of the analytic PSD to use. low_fr length : int The length of noise to generate in samples. delta_t : float The time step of the noise. seed : {None, int} The seed to generate the noise. low_frequency_cutof : {10.0, float} The low frequency cutoff to pass to the PSD generation. Returns -------- noise : TimeSeries A TimeSeries containing gaussian noise colored by the given psd. rNg?g?r)r )Z pycbc.psdrrZ from_stringr!) Zpsd_namerrr Zlow_frequency_cutoffpycbcr Zflenrrrrnoise_from_strings r$)N)N)Nr")__doc__r#rZ pycbc.typesrrrrrZ numpy.randomr Zimport_optionalrrr!r$rrrrs   ( 7