A frequency error detection apparatus and method based on histogram information
of an input signal. The apparatus includes an A/D converter for and converting
an analog signal into digital values; a zero crossing point detector for detecting
sign changes of the digital values, and detecting zero crossing points; a period
information detector for detecting period information which is the number of the
digital values corresponding to a periodic signal; a histogram information calculator
for counting the number of detections for the respective period information based
on the period information, and calculating error-detection-target histogram information;
and a frequency error calculator for detecting a difference between the error-detection-target
histogram information and a reference histogram information, and calculating a
frequency error value based on the difference. This can shorten time for frequency
error detections and improve accuracy of the detected frequency error value.
