Patent ID: 6310863
Filing Date: 2001-10-30
Classification: H04B

Abstract:
A dual-band data communication device comprising:a receiver for converting a reception wave into orthogonal base-band reception signals,A/D converters for converting said orthogonal base-band reception signals into digital orthogonal base-band reception signals,a dual-band digital demodulation processing means for demodulating said digital orthogonal base-band reception signals into reception data,a dual-band digital modulation processing means for modulating transmission data into digital orthogonal base-band transmission signals,D/A converters for converting said digital orthogonal base-band transmission signals into orthogonal base-band transmission signals,a transmitter for converting said orthogonal base-band transmission signals into a transmission wave, anda band selection control means for controlling selection as to which one of a first band and a second band is used, whereinsaid dual-band digital demodulation processing means includes;means for performing demodulation properly when selected one of said first band and said second band is used in accordance with selection control between a first band local oscillation and a second band local oscillation by said band selection control means.