JPS56115051A - Fm communication system - Google Patents

Fm communication system

Info

Publication number
JPS56115051A
JPS56115051A JP1873480A JP1873480A JPS56115051A JP S56115051 A JPS56115051 A JP S56115051A JP 1873480 A JP1873480 A JP 1873480A JP 1873480 A JP1873480 A JP 1873480A JP S56115051 A JPS56115051 A JP S56115051A
Authority
JP
Japan
Prior art keywords
carriers
antenna
circuit
base band
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1873480A
Other languages
Japanese (ja)
Inventor
Takahiko Yamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP1873480A priority Critical patent/JPS56115051A/en
Publication of JPS56115051A publication Critical patent/JPS56115051A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/12—Arrangements for reducing cross-talk between channels

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To reduce the interference noise between the adjacent channels and thus enhance the quality of the circuit, by transmitting at the transmission side the carriers of several FM waves and the power of spectrum near the carriers after an attenuation each. CONSTITUTION:The base band signals ch-1 and so on are supplied to the microwave converters 7 and so on via the FM modulators 4 and so on, and each conversion output is applied to the branching filters 13 and so on for synthesization of channel via the resonance circuits 10 and so on that attenuate the power of spectrum near the carrier. Thus a circuit of FDM type is formed by the output of each branching filter, and a transmission is performed through the antenna 16. The reception signal of the antenna 17 is extracted in the form of each base band signal via the branching filters 18, the frequency converters 21, the resonance circuits 24 having the adverse characteristics to that of the transmission side, and the FM demodulators 27 each.
JP1873480A 1980-02-18 1980-02-18 Fm communication system Pending JPS56115051A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1873480A JPS56115051A (en) 1980-02-18 1980-02-18 Fm communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1873480A JPS56115051A (en) 1980-02-18 1980-02-18 Fm communication system

Publications (1)

Publication Number Publication Date
JPS56115051A true JPS56115051A (en) 1981-09-10

Family

ID=11979893

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1873480A Pending JPS56115051A (en) 1980-02-18 1980-02-18 Fm communication system

Country Status (1)

Country Link
JP (1) JPS56115051A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6347045A (en) * 1986-08-12 1988-02-27 Nissan Motor Co Ltd Specification control device for article

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6347045A (en) * 1986-08-12 1988-02-27 Nissan Motor Co Ltd Specification control device for article

Similar Documents

Publication Publication Date Title
TW362318B (en) Method and apparatus for mitigating intermodulation effects in multiple-signal transmission systems
EP0304890A3 (en) Earth station capable of effectively using a frequency band of a satellite
DE3265907D1 (en) Community antenna arrangement
JPS5456341A (en) Transmission antenna sharing system for land mobile rado base station
EP0036431A4 (en) Transmitter having a phase-locked loop.
ES8506960A1 (en) Television transmissions.
CA2089701A1 (en) System and method for combining multiple transmitters in a multiple channel communication system
DE3363313D1 (en) Carrier frequency system for four-wire operation
ES482039A1 (en) Multifrequency generator
JPS56115051A (en) Fm communication system
CA2285198A1 (en) Parallel transmission method
FI883403A (en) KALLHAERDANDE FORMAEMNE-BINDEMEDEL OCH DESS ANVAENDNING.
SU546112A1 (en) Broadcast signal transmission device over multichannel communication system channels
JPS5773539A (en) Mobile radio communication system
JPS54125913A (en) Frequency modulation radio transmission system
JPS57104389A (en) Trap circuit
JPS5484413A (en) Heterodyne repeating system
ES2191024T3 (en) PROCEDURE FOR THE TRANSMISSION OF A SIGNAL AT A MINIMUM IN TWO CHANNELS.
SU580650A1 (en) Method of non-mutual transmission of frequensy-modulated signals
GOLOVIN Controllable companding in low-frequency FM radio communication systems[Abstract Only]
JPS5673936A (en) S/n monitor
JPS5767337A (en) Community receiving device
JPS56119539A (en) Four-wire transmission system
JPS5820172B2 (en) How to set the intermediate frequency of mobile radio equipment
RU94033242A (en) Method of narrowing of band of occupied frequencies when transmitting high-frequency signals and of increased efficiency of transmission and reception of high-frequency signals and device for its realization