Apparatus for detecting the number of beats
First Claim
1. An apparatus for detecting the number of beats comprising:
- extract means for extracting a predetermined frequency component from an input audio signal;
level detecting means for generating a detection signal when detecting that a level of the predetermined frequency component extracted by said extract means is higher than a predetermined level;
first time measuring means for measuring a predetermined period in response to said detection signal;
means for prohibiting said level detecting means from generating said detection signal during measuring time of said first measuring means;
second time measuring means for starting to measure time in response to said detection signal and, after that, terminating measuring of time in response to a detection signal newly generated from said level detecting means; and
converting means for converting a period of time measured at termination of measuring of said second time measuring means into the number of beats per predetermined unit time regarded as a unit beat.
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Abstract
An apparatus for detecting the number of beats in that second time measuring means starts to measure time from a time point when the level of a predetermined frequency component of an input audio signal is once higher than a predetermined level and, after a predetermined period T1 elapses from the time point, the measurement of time by the second time measuring means is terminated at a time point when the level of the predetermined frequency component of the input audio signal is again higher than the predetermined level, thereby to convert a measured period T2 at termination of measuring of the second time measuring means into BPM i.e., the number of beats per predetermined unit time regarding as a unit beat.
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Citations
10 Claims
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1. An apparatus for detecting the number of beats comprising:
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extract means for extracting a predetermined frequency component from an input audio signal; level detecting means for generating a detection signal when detecting that a level of the predetermined frequency component extracted by said extract means is higher than a predetermined level; first time measuring means for measuring a predetermined period in response to said detection signal; means for prohibiting said level detecting means from generating said detection signal during measuring time of said first measuring means; second time measuring means for starting to measure time in response to said detection signal and, after that, terminating measuring of time in response to a detection signal newly generated from said level detecting means; and converting means for converting a period of time measured at termination of measuring of said second time measuring means into the number of beats per predetermined unit time regarded as a unit beat. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification