Determining roughness from fundamental frequency variations - by taking difference between measured fundamental characteristic and generated smoothed fundamental characteristic

摘要

In a first step the ripple is separated from the remainder of the fundamental frequency characteristic by forming the difference between the measured fundmental frequency characteristic and a generated smoothed fundamental frequency characteristic. In a second step the ripple generated in the first step is compared with the measured characteristic. The comparison involves finding regions of approximately linear rise or fall in the measured characteristic and determining and displaying an integral value of the ripple generated in the first step, e.g. the standard deviation, over the identified region. USE/ADVANTAGE - For use in measuring the fundamental frequency of bioacoustic signals, esp. for analysis of cries of infants. Ripple of fundmental frequency characteristic determined quantitatively.