US 6,310,863 B1Granted

Dual-band data communication device

AssigneeMatsushita Electric Industrial Co., Ltd.

InventorNaoyuki Yamamoto

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Abstract

The direction of rotation of the phase of signals in a dual-band digital demodulation processing means 110 and a dual-band digital modulation processing means 112 is controlled in accordance with a band selection control means 113 for selecting a first-band local oscillator 105 or a second-band local oscillator 106 so as to be reversed an even number of times in total. The direction of rotation of the phase of signals is controlled to return its original direction of rotation finally even if there is a difference between the first and second bands in the high/low relationship between the transmission/reception frequency and the local oscillation frequency. Accordingly, reception data can be outputted properly, and a transmission wave can be outputted properly. Since it is possible to attain transmission and reception properly in any high/low relationship between the transmission/reception frequency and the local oscillation frequency, the degree of freedom in selecting the local oscillation frequency can be increased.

Claims10

Dependent claims

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, and
a band selection control means for controlling selection as to which one of a first band and a second band is used, wherein
said 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.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/067,115Filed 27 Apr 1998
Priority: JP 9-14114116 May 1997
Granted: 30 Oct 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04B 1/0032
Wherein the AD/DA conversion occurs at baseband stage: with analogue quadrature frequency conversion to and from the baseband
H04B 1/0003
Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised…
H04B 1/005
Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised…
H04B 1/26
Circuits: for superheterodyne receivers