BODY MOVEMENT DETECTING APPARATUS AND METHOD
First Claim
1. A body movement detecting apparatus comprising:
- a time-frequency converting unit configured to convert an input acoustic signal to a frequency component;
an electric power difference computing unit configured to compute an electric power difference value of the frequency component of each of predetermined frequency bandwidths;
a duration computing unit configured to compute duration in which a number of the predetermined frequency bandwidths each exhibiting the electric power difference value less than a first threshold is equal to or greater than a second threshold;
a similarity value computing unit configured to compute a value indicating similarity of the electric power difference value of each of the predetermined frequency bandwidths; and
a body movement detecting unit configured to detect body movement based on the computed duration and the computed value.
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Abstract
A body movement detecting apparatus includes a time-frequency converting unit configured to convert an input acoustic signal to a frequency component, an electric power difference computing unit configured to compute an electric power difference value of the frequency component of each of predetermined frequency bandwidths, a duration computing unit configured to compute duration in which a number of the predetermined frequency bandwidths each exhibiting the electric power difference value less than a first threshold is equal to or greater than a second threshold, a similarity value computing unit configured to compute a value indicating similarity of the electric power difference value of each of the predetermined frequency bandwidths, and a body movement detecting unit configured to detect body movement based on the computed duration and the computed similarity value.
10 Citations
7 Claims
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1. A body movement detecting apparatus comprising:
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a time-frequency converting unit configured to convert an input acoustic signal to a frequency component; an electric power difference computing unit configured to compute an electric power difference value of the frequency component of each of predetermined frequency bandwidths; a duration computing unit configured to compute duration in which a number of the predetermined frequency bandwidths each exhibiting the electric power difference value less than a first threshold is equal to or greater than a second threshold; a similarity value computing unit configured to compute a value indicating similarity of the electric power difference value of each of the predetermined frequency bandwidths; and a body movement detecting unit configured to detect body movement based on the computed duration and the computed value. - View Dependent Claims (2, 3, 4, 5)
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6. A body movement detecting method executed by a computer, the method comprising:
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converting an input acoustic signal to a frequency component; computing an electric power difference value of the frequency component of each of predetermined frequency bandwidths; computing duration in which a number of the predetermined frequency bandwidths each exhibiting the electric power difference value less than a first threshold is equal to or greater than a second threshold; computing a value indicating similarity of the electric power difference value of each of the predetermined frequency bandwidths; and detecting body movement based on the computed duration and the computed similarity value.
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7. A non-transitory computer-readable medium storing a body movement detecting program, which, when processed by a computer, causes the computer to execute a sequence of processes, the sequence of processes comprising:
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converting an input acoustic signal to a frequency component; computing an electric power difference value of the frequency component of each of predetermined frequency bandwidths; computing duration in which a number of the predetermined frequency bandwidths each exhibiting the electric power difference value less than a first threshold is equal to or greater than a second threshold; computing a similarity value indicating similarity of the electric power difference value of each of the predetermined frequency bandwidths; and detecting body movement based on the computed duration and the computed similarity value.
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Specification