RADIO EQUIPMENT AND PERIPHERAL APPARATUS

• US 20020094034A1
• Filed: 11/09/1999
• Published: 07/18/2002
• Est. Priority Date: 05/02/1995
• Status: Active Grant

• Current Assignee: Yukihiro Moriyama
• Original Assignee: Yukihiro Moriyama
• Inventors: MORIYAMA, YUKIHIRO
• Granted Patent: US 6,483,880 B2
• Time in Patent Office: Days
• 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. Radio equipment for communicating digital data comprising:

a clock modulation part for angular-modulation of a clock signal by a given modulation signal; and

a data processing part processing said digital data based on said clock signal angular-modulated in said clock modulation part and producing angular-modulated digital data;

wherein levels of harmonics generated from said clock signal and said digital data are reducible.

2. The radio equipment as claimed in claim 1, wherein said radio equipment further comprises:

a signal modulation part modulating a radio signal by said angular-modulated digital data from the data processing part; and

a transmission part transmitting the radio signal modulated in said signal modulation part.

3. The radio equipment as claimed in claim 1, wherein said radio equipment further comprises:

a reception part receiving a radio signal; and

a demodulation part demodulating said radio signal from the reception part and producing digital data.

7. The radio equipment as claimed in claim 1, wherein said radio equipment further comprises an interference detection part detecting interference to a received signal, and operation of said clock modulation part is based on an output of said interference detection part.

8. The radio equipment as claimed in claim 1, wherein said radio equipment further comprises an interference channel table which stores receiving channels subjected to interference by harmonics generated in the radio equipment, and said clock modulation part operates when one of said receiving channels stored in said interference channel table is used.

9. The radio equipment as claimed in claim 1, wherein said clock modulation part operates only during reception of a radio signal.

10. The radio equipment as claimed in claim 1, wherein said radio equipment further comprises a signal processing part which communicates said digital data by use of a time division multiple, a time interval of a time division frame given by integral multiples of a period of said given modulation signal for angular-modulation of the clock signal in said clock modulation part.

4. Radio equipment for communicating digital data comprising:

a reception part receiving a radio signal;

a demodulation part demodulating said radio signal from the reception part and producing digital data;

a clock recovery part for recovering a recovered clock in relation to said digital data from said demodulation part; and

a recovered-clock modulation part for angular-modulation of said recovered clock from the clock recovery part by a given modulation signal;

wherein levels of harmonics generated from said recovered clock signal and said clock recovery part are reducealbe.

5. A clock modulation module comprising:

a clock modulation part for angular-modulation of a clock signal by a given modulation signal; and

a data processing part processing digital data for radio communication based on the clock signal angular-modulated in the clock modulation part, and producing angular-modulated digital data;

wherein levels of harmonics generated from said clock signal and said digital data are reducible.

6. Radio equipment for receiving a radio signal modulated by angular-modulated digital data, said radio equipment comprising:

a reception part receiving said radio signal;

a demodulation part demodulating said radio signal in synchronization with frequency and phase variation of said angular-modulated digital data so as to produce digital data in which an angular modulation component is avoided.

11. An apparatus comprising:

a control circuit processing data based on a clock signal;

a transmission line transmitting angular-modulated data; and

a modulation-component avoiding part, connected to said transmission line, to avoid a modulation component from said angular-modulated data from said control circuit so as to produce data in which said modulation component is avoided;

wherein levels of harmonics generated from said angular-modulated data from said transmission line is reducible.

12. The apparatus as claimed in claim 11, wherein 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 from said control circuit through the transmission line by an output of said phase shift part so as to cancel said modulation component.

13. The apparatus as claimed in claim 11, wherein said apparatus further comprises radio equipment controlled by said control circuit.

15. The apparatus as claimed in claim 14, 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.

16. The apparatus as claimed in claim 14, wherein said apparatus further comprises a control circuit which receives and processes said data from the modulation-component avoiding part.

18. The radio equipment as claimed in claim 17, wherein said radio equipment further comprises a divider for dividing said reference signal, and a divided signal of said divider is used as said clock signal.

14. An apparatus comprising a modulation-component avoiding part avoiding a modulation component from angular-modulated data transmitted from a first apparatus through a transmission line, and producing data in which said modulation component is avoided.

17. Radio equipment for communicating digital data comprising:

a clock oscillator generating a clock signal; and

a carrier generation part generating a carrier based on a reference signal;

wherein frequency of said reference signal is given by integral multiples of frequency of said clock signal.

19. An apparatus positioned adjacent to radio equipment, comprising:

a reference signal receiving part receiving a reference signal from said radio equipment for generating a carrier; and

a control circuit operating based on said reference signal.

20. Radio equipment comprising a reference signal connection part connecting to a peripheral apparatus at least one of a reference signal for generating a carrier and signals given by dividing the reference signal.

21. Radio equipment positioned adjacent to a peripheral apparatus, comprising:

a clock signal receiving part receiving a clock signal from said peripheral apparatus; and

a carrier generation circuit generating a carrier based on said clock signal received from the peripheral apparatus through said clock signal receiving part.

22. Radio equipment for receiving a signal modulated by digital data comprising:

a reception part receiving said signal;

a demodulation part demodulating said signal to produce digital data, said demodulation part comprising a carrier recovery part recovering a carrier from said signal; and

a clock oscillator generating a clock signal;

wherein frequency of a recovered carrier from said demodulation part is given by integral multiples of frequency of said clock signal.

23. The radio equipment as claimed in claim 22, wherein said radio equipment further comprises a divider for dividing said recovered carrier from said demodulation part, and a divided signal from said divider is used as said clock signal.

29. The radio equipment as claimed in claim 27, wherein said timing clock oscillator comprises a plurality of oscillators which have different frequencies, and when one of said receiving channels stored in said interference channel table is used, oscillator is changed in said plurality of oscillators to change said frequency of the timing clock signal.

24. An apparatus positioned adjacent to radio equipment, comprising:

a recovered-carrier receiving part receiving a recovered carrier recovered from a received signal in the radio equipment; and

a control circuit operating based on said recovered carrier.

25. Radio equipment comprising a recovered-carrier connection part connecting a peripheral apparatus to a recovered carrier recovered from a received signal.

26. Radio equipment for communicating digital data comprising:

a clock oscillator generating a clock signal;

an interference detection part detecting interference with a received signal; and

a clock control part changing frequency of said clock signal so that the interference detected in said interference detection part decreases.

27. Radio equipment for communicating digital data comprising:

a timing clock oscillator generating a timing clock signal;

a digital data generation part generating said digital data based on said timing clock signal;

a transmission part transmitting a carrier modulated by said digital data;

a reception part receiving a signal on a receiving channel; and

an interference channel table storing receiving channels which are subjected to interference by harmonics of said timing clock signal and said digital data;

wherein frequency of said timing clock signal is changed when one of said receiving channels stored in said interference channel table is used.

28. The radio equipment as claimed in claim wherein said timing clock oscillator comprises a variable frequency clock oscillator, and when one of said receiving channels stored in said interference channel table is used, oscillation frequency of said variable frequency clock oscillator is changed to change said frequency of the timing clock signal.

30. Radio equipment having a reception part and a control part, said radio equipment comprising:

a clock oscillator generating a clock signal in said control part;

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

an adjustment part adjusting a level ratio of a 180-degree shifted clock signal to said clock signal; and

an interference detection part detecting interference to a received signal in said reception part;

wherein said level ratio is adjusted in the adjustment part so that a harmonic of said clock signal and a harmonic of said 180-degree shifted clock signal cancel each other and said interference is reduced.

31. The radio equipment as claimed in claim 30, wherein said radio equipment further comprises a first line for said clock signal and a second line for said 180-degree shifted clock signal, said first line and said second line being arranged adjacent to each other.