ON and FSS dual mode demodulation method and apparatus

摘要

PURPOSE: An OKK and FSK dual mode demodulating method and a device thereof are provided to reduce a zero cross measuring error of a n on-off keying modulation signal by adding an optimum DC bias. CONSTITUTION: A band pass filter(220) passes a signal of at least two frequency bands. The band pass filter unit blocks the remaining frequency band signal. A dual mode demodulation module(210) divides the modulation method of the inputted signals by using frequency difference of the inputted signals. The band pass filter unit passes an OKK modulation signal and an FSK signal. The dual mode demodulation module includes a cross detector(212), a frequency calculator(213), and a frequency comparator(214).