Radio equipment and peripheral apparatus

• US 6,483,880 B2
• Filed: 11/09/1999
• Issued: 11/19/2002
• Est. Priority Date: 05/02/1995
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Moriyama, Yukihiro
• Primary Examiner(s): VO, DON NGUYEN
• Application Number:
  US09/436,832
• Publication Number:
  US 20020094034A1
• Time in Patent Office: 1,106 Days
• Field of Search: 375/271, 375/285, 375/302, 375/272, 375/279, 375/284, 375/322, 375/326, 375/329
• US Class Current: 375/271
• CPC Class Codes: H04B 15/04 the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder

Abstract

Radio equipment for communicating digital data includes a clock modulation part for angular-modulation of a clock signal by a given modulation signal; and a data processing part processing the digital data based on the clock signal angular-modulated in the clock modulation part and producing angular-modulated digital data. In the radio equipment, levels of harmonics generated from the clock signal and the digital data are reducible.

Claims

1. A system for reducing interference influences on a radio equipment when receiving a radio signal using a receiving channel subjected to interference by harmonics generated in the radio equipment, wherein a first control apparatus is connected to a second control apparatus through a wired transmission line located close to the radio equipment, said system comprising:

a control circuit provided in said first control apparatus and processing data based on a clock signal;

a wired transmission line receiving angular-modulated data from said first control apparatus and sending the angular-modulated data to said second control apparatus at a reception end of the transmission line; and

a modulation-component avoiding part, provided in said second control apparatus and connected to said transmission line at a position preceding said reception end, to avoid a modulation component from said angular-modulated data, received at said preceding position of the transmission line, so as to produce data at said reception end in which said modulation component is avoided;

wherein levels of harmonics generated from said angular-modulated data are reducible along the transmission line,

wherein said modulation-component avoiding part comprises;

a phase shift part shifting clock signal by 180 degrees; and

a second modulation part modulating said angular-modulated data received at said preceding position of the transmission line by an output of said phase shift part so as to cancel said modulation component.

2. The apparatus as claimed in claim 1, wherein said apparatus further comprises radio equipment controlled by said control circuit.

3. A system for reducing interference influences on a radio equipment when receiving a radio signal using a receiving channel subjected to interference by harmonics generated in the radio equipment, wherein a wired transmission line between a first control apparatus and a second control apparatus is located close to the radio equipment, said system comprising a modulation-component avoiding part, provided in the second control apparatus and connected to the wired transmission line at a position preceding a reception end of the transmission line, said modulation-component avoiding part avoiding a modulation component from angular-modulated data, received from the first control apparatus at said preceding position of the transmission line, by further modulating the angular-modulated data, and producing data at the reception end in which said modulation component is avoided.

4. The apparatus as claimed in claim 3, wherein said first apparatus operates based on a clock signal, said angular-modulated data is generated by modulating said clock signal by a given modulation signal, and said modulation-component avoiding part comprises a phase shift part shifting said clock signal by 180 degrees, and a second modulation part modulating said angular-modulated data transmitted from said first apparatus through the transmission line by an output of said phase shift part so as to cancel said modulation component.

5. The apparatus as claimed in claim 3, wherein said apparatus further comprises a control circuit which receives and processes said data from the modulation-component avoiding part.