Waveform analyzer and waveform analysis method

摘要

A waveform analyzer includes a converter which converts a logical function, where a pair of data including a time and a value at the time is variable, created according to data sets of a time and a value of a signal waveform at the time into a second function expressed by a binary decision diagram, an acquisition unit which obtains for each of characteristic points of a reference waveform a condition representative of constraints on a relationship between time information specified by the points and a value corresponding to the time information in the signal waveform according to a value of the reference waveform at the points and a specified tolerance given to a value of the reference waveform, and a searching unit which applies the condition for each of the points to the second function to obtain a time range which meets the entirety of the conditions.

主权项

1. A waveform analyzer which searches a signal waveform of an input signal for a portion similar to a reference waveform, the waveform analyzer comprising a computer that includes:
an electrocardiogram sensor which measures an action potential of cardiac muscle and which outputs an electrocardiogram signal; and a processor which performs a process including:
a signal waveform obtaining process which obtains a pair of data sets of a time and a value of the signal waveform of the electrocardiogram signal, which is outputted from the electrocardiogram sensor, at the time obtained by sampling the signal waveform;a convert process which creates according to the pair of data sets a characteristic function which is a logical function where a pair of data including a time and a value at the time is variable, and which converts the created characteristic function into a second function which is an expression on a binary decision diagram;a constraint condition acquisition process which obtains for each of characteristic points of the reference waveform a constraint condition representative of constraints on a relationship between time information specified by the characteristic points and a value corresponding to the time information in the signal waveform according to a value of the reference waveform at the characteristic points and a specified tolerance given to a value of the reference waveform by creating a binary decision diagram representing the constraint condition according to the value of the reference waveform at the characteristic points and the specified tolerance; anda searching process which applies the constraint condition for each of the plurality of characteristic points to the second function to obtain a time range which meets the constraint condition for all the plurality of characteristic points, and which outputs information of the time range as a result of a search, the constraint condition being applied by performing a logical operation between the binary decision diagram representing the second function and the binary decision diagram representing the constraint condition.