IMPLEMENTATION OF FAST FOURIER TRANSFORM (FFT) FOR INFANT CRYING DETECTION

Babies cry based on the discomfort felt by the baby which is a reflex such as when a hungry baby will suck his hand
and then he will start crying, hunger can be interpreted from the baby's crying. At each of the baby's cries, when each crying
pattern was responded to with the solution applied to the previous baby, each baby would stop crying. For this reason, to
carry out this solution, a research was carried out to identify the pattern recognition of the sound of a baby's cry using the
fast fourier transform (FFT) method with several different frequency ranges. The voice recording process is stored in digital
form in the form of frequency-based sound spectrum waves, where signals that were previously in the time domain will be
changed in the frequency domain. The sounds that will be distinguished in this study include the sounds of crying babies,
adults, and colliding objects. This can be obtained through several stages, namely sound sample recording, sampling, signal
cutting, frame blocking, final normalization, hamming window, and finally the FFT calculation process. From these series
of stages, the results of the frequency range of baby crying are 101-1863 Hz, for adults the frequency range is 101-1376
Hz and for the sound of colliding objects 101-2233 Hz.