An EDF parser written in coffee-script.
Primarily used for Polysomnographic signals, the EDF file format is multi-channel, supports multiple sampling rates on a per channel basis, and provides for an unlimited number of channels. More information can be found on the wikipedia article.
util = require "util"
edf = require "edf"
# Create a new instance of edf.EDFFile.
my_edf = new edf.EDFFile "./path/to/some.edf"
# Get some information about the file.
file_duration = my_edf.get_file_duration( )
num_signals = my_edf.get_header_item "num_signals_in_data_record"
util.log "The file is " + file_duration + " seconds in length."
util.log "There are " + num_signals + " signals in this file."
# Get some information about the signals.
for signal_index in [0..num_signals-1]
signal_label = my_edf.get_signal_item signal_index, "label"
sample_rate = my_edf.get_header_item( "duration_of_data_record" ) / my_edf.get_signal_item( signal_index, "num_samples_in_data_record" )
min = my_edf.get_signal_item signal_index, "physical_min"
max = my_edf.get_signal_item signal_index, "physical_max"
util.log signal_label + " has a sampling rate of " + sample_rate + " Hz."
util.log signal_label + " has a min and max of " + min + ": " + max + "."The following items are available in the EDF header and can be accessed by using get_header_item.
- version
- patient_id
- recording_id
- start_date
- start_time
- number_of_bytes
- reserved
- num_data_records
- duration_of_data_record
- num_signals_in_data_record
These items are available using get_signal_item. A signal index must be passed along as the first argument.
- label
- transducer_type
- physical_dimensions
- physical_min
- physical_max
- digital_min
- digital_max
- prefiltering
- num_samples_in_data_record
Three clause BSD. See LICENSE.
Original work sponsored by Younes Sleep Technologies.
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