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US 7,398,075 B2Granted
Radio wave reception device and radio wave clock
AssigneeCasio Computer Co., Ltd.
InventorKaoru Someya
Life of this patent
Estimating the term…
Abstract
In a radio wave reception device and a radio wave clock capable of receiving multiple frequencies, an intermediate frequency signal whose frequency is fixed can be output while a signal output from a local oscillation circuit (5) is fixed.
Claims4
A radio wave reception device comprising:
- a radio wave reception unit which is capable of receiving arbitrary radio wave signals having different frequencies, and which converts a received arbitrary radio wave signal into an electric signal and outputs the electric signal;
- an oscillation unit which includes a frequency determining section which determines a frequency f0 in accordance with an equation:
- (|f1±fi|/p1)= . . . =(|fn±fi|/pn)=f0
- where p1, . . . , pn are positive integers and n is an integer equal to or greater than 2, and wherein the equation defines a relationship between the respective frequencies f1, . . . , fn of the arbitrary radio wave signals receivable by the radio wave reception unit and an intermediate frequency fi, and wherein the oscillation unit outputs a signal having the frequency f0;
- a multiplying unit which multiplies the signal having the frequency f0 output from the oscillation unit;
- a frequency conversion unit which synthesizes the electric signal output from the radio wave reception unit with the signal output from the multiplying unit, and outputs a signal having the intermediate frequency fi which has a fixed value that is the same for all of the arbitrary radio wave signals receivable by the radio wave reception unit;
- and
- a detection unit which demodulates the signal having the intermediate frequency fi output from the frequency conversion unit.
5 more elements
A radio wave reception device comprising:
- a radio wave reception unit which is capable of receiving arbitrary radio waves having different frequencies, and which outputs a received arbitrary radio wave by converting the received arbitrary radio wave into an electric signal;
- an oscillation unit which outputs a signal having a frequency f0 which is obtained from an equation:
- (|f1±fi|p1)= . . . =(|fn±fi|/pn)=f0
- where p1, . . . , pn are positive integers and n is an integer equal to or greater than 2, and wherein the equation defines a relationship between the respective frequencies f1, . . . , fn of the arbitrary radio waves receivable by the radio wave reception unit and an intermediate frequency fi;
- a frequency conversion unit which synthesizes the electric signal output from the radio wave reception unit with a harmonic component of the signal having the frequency f0 output from the oscillation unit, and outputs the signal having the intermediate frequency fi;
- and
- a detection unit which demodulates the signal having the intermediate frequency fi output from the frequency conversion unit.
4 more elements
A radio wave clock comprising a radio wave reception device, wherein the radio wave reception device includes:
- a radio wave reception unit which is capable of receiving arbitrary radio waves that contain time data and that have different frequencies, wherein the radio wave reception unit outputs a received arbitrary radio wave by converting the received arbitrary radio wave into an electric signal;
- an oscillation unit which outputs a signal having a frequency f0 which is obtained from an equation:
- (|f1±fi|/p1)= . . . =(|fn±fi|/pn)=f0
- where p1, . . . , pn are positive integers and n is an integer equal to or greater than 2, and wherein the equation defines a relationship between the respective frequencies fi, . . . , fn of the arbitrary radio waves receivable by the radio wave reception unit and an intermediate frequency fi;
- a frequency conversion unit which synthesizes the electric signal output from the radio wave reception unit with a harmonic component of the signal having the frequency f0 output from the oscillation unit, and outputs the signal having the intermediate frequency fi;
- and
- a detection unit which demodulates the signal having the intermediate frequency fi output from the frequency conversion unit.
4 more elements
Dependencies are inferred from the claim text.