Patent ID: 7877024
Filing Date: 2011-01-25
Classification: G08C

Abstract:
1. An infrared signal decode circuit, comprising: a comparator configured to compare an electric signal converted from an infrared signal with a sampling frequency greater than or equal to double of a subcarrier frequency contained in the infrared signal to convert the electric signal to a binary signal; a correlation signal generator configured to generate a sum of a first detection signal and a second detection signal as a correlation signal, the first detection signal being obtained by performing an absolute value calculation on a first correlation signal, the second detection signal being obtained by performing an absolute value calculation on a second correlation signal, the first correlation signal being a first correlation value within a sampling interval, the second correlation signal being a second correlation value within a sampling interval, the first correlation value corresponding to a correlation between the binary signal and a first reference signal with a frequency substantially identical to a base frequency of a subcarrier of the infrared signal, the second correlation signal corresponding to a correlation between the binary signal and a second reference signal with a phase that differ from a phase of the first reference signal by 90 degrees; and a decoder configured to binarize the correlation signal generated by the correlation signal generator and output the binarized correlation signal as a decode signal.