A method and apparatus for detecting a pitch using frequency analysis are
provided. An externally input digital signal is analyzed into frequency
component values at predetermined time intervals, and positions of peaks
of the digital signal are detected based on the frequency component
values. It is determined whether a frequency at a maximum peak position
among the peak positions is a pitch or a n-order harmonic frequency of
the pitch to detect a pitch. Then, the range of the pitch is determined
based on the range of a harmonic frequency of the detected pitch.
Accordingly, an error range for the pitch detected using frequency
analysis is minimized, thereby more exactly detecting a pitch when the
pitch is detected using the frequency analysis.