Patent ID: 11918372
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A

Claim 9:
10. A non-transitory computer-readable storage medium storing program for causing a computer to execute a cognitive function evaluation method, the cognitive function evaluation method comprising:
displaying, by a display device, an image that indicates sentence data indicating a sentence to be uttered by an evaluatee and further outputting an instruction for causing the evaluatee to utter the sentence a plurality of times, the sentence to be uttered by the evaluate is a sentence containing five or more characters each consisting of a stop consonant and a subsequent vowel;
wherein the sentence further contains at least two consecutive syllables, each including a vowel different from vowels of another syllables,
obtaining utterance data captured using a microphone indicating a voice of the evaluatee uttering the sentence;
calculating, by the computer, from the utterance data, a feature based on the utterance data and calculating, as the feature, an amount of change in reading time calculated from reading times obtained for the plurality of times the evaluatee uttered the sentence;
evaluating, by executing the computer, a cognitive function of the evaluatee by comparing the feature calculated in the calculating to reference data indicating a relationship between voice data indicating a voice of a person and a cognitive function of the person; and
outputting a result of the evaluating wherein the sentence contains a character string of consecutive syllables, and each including a vowel,
calculating, by executing the computer, at least one of amounts of changes in a first formant frequency and a second formant frequency of a vowel, a number of times required for the changes in the first formant frequency and the second formant frequency of the vowel, or rates of changes that are ratios of amounts of changes to the number of times required, and
further wherein computer calculates, as the feature, a positional relationship when plotting a ratio of a second formant frequency to a first formant frequency calculated from the vowel of each of the at least two consecutive syllables in a coordinate space defined by the second formant frequency of the vowel with respect to the first formant frequency of the vowel; and
further wherein the computer is further configured to identify the vowel in the voice data and calculate the feature based on a formant obtained from a spectrum of the vowel identified; and
the computer is further configured to evaluate that the cognitive function of the evaluatee as a variation in the formant increases.