Patent ID: 7043383
Filing Date: 2006-05-09
Classification: H03L,H03M

Abstract:
1. A frequency error detection apparatus based on histogram information on an input signal, comprising: an analog-to-digital (A/D) converter for sampling and converting an analog signal inputted to an electronic device requiring frequency synchronization, into digital values comprising positive and negative signs; a zero crossing point detector for detecting sign changes of the digital values, and detecting zero crossing points at which signs of the digital values change; a period information detector for detecting a period information which is a number of the digital values corresponding to a periodic signal, wherein the periodic signal is a signal between two of the detected zero crossing points; a histogram information calculator for counting a number of detections of the period information, and calculating histogram information of the period information for periodic signals; and a frequency error calculator for detecting a difference between the histogram information and a reference histogram information of a signal frequency-synchronized with the electronic device, and calculating a frequency error value (FE) based on the difference.