JPS5460817A - Fm modulation system for fm radio transmission-reception device - Google Patents

Fm modulation system for fm radio transmission-reception device

Info

Publication number
JPS5460817A
JPS5460817A JP12784977A JP12784977A JPS5460817A JP S5460817 A JPS5460817 A JP S5460817A JP 12784977 A JP12784977 A JP 12784977A JP 12784977 A JP12784977 A JP 12784977A JP S5460817 A JPS5460817 A JP S5460817A
Authority
JP
Japan
Prior art keywords
frequency
reception device
intermediate frequency
signal
converted
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
JP12784977A
Other languages
Japanese (ja)
Inventor
Tetsuo Kaneko
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.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP12784977A priority Critical patent/JPS5460817A/en
Publication of JPS5460817A publication Critical patent/JPS5460817A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits

Landscapes

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

Abstract

PURPOSE:To increase the frequency deviation and to improve the C/N ratio without increasing the multiplying number, by converting once the modulated wave for the frequency into a low frequency. CONSTITUTION:In the FM modulation system of the FM radio reception device, first mixer MIX2, which mixes the modulation signal sent from oscillation modulator OMOD (first oscillator) performing the frequency oscillation and the high frequency output of second oscillator OSC, is installed to convert the modulated wave into a low frequency. This converted mixture signal is applied to multiplier MP1 to be changed to 1/n (n = integer) intermediate frequency of the reception device and then to be converted to the same frequency as the intermediate frequency. Then the signal converted to the same frequency as the intermediate frequency is applied to second mixer MIX3 via crystal filter X-FIL and then mixed with the high frequency output supplied from second oscillator OSC to obtain the necessary output frequency. The band pass filter of intermediate frequency amplifier IA and filter X-FIL are used in common to eliminate the unnecessary waves for the intermediate frequency signal.
JP12784977A 1977-10-25 1977-10-25 Fm modulation system for fm radio transmission-reception device Pending JPS5460817A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12784977A JPS5460817A (en) 1977-10-25 1977-10-25 Fm modulation system for fm radio transmission-reception device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12784977A JPS5460817A (en) 1977-10-25 1977-10-25 Fm modulation system for fm radio transmission-reception device

Publications (1)

Publication Number Publication Date
JPS5460817A true JPS5460817A (en) 1979-05-16

Family

ID=14970181

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12784977A Pending JPS5460817A (en) 1977-10-25 1977-10-25 Fm modulation system for fm radio transmission-reception device

Country Status (1)

Country Link
JP (1) JPS5460817A (en)

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