JPS5455312A - Fm receiver - Google Patents

Fm receiver

Info

Publication number
JPS5455312A
JPS5455312A JP12204977A JP12204977A JPS5455312A JP S5455312 A JPS5455312 A JP S5455312A JP 12204977 A JP12204977 A JP 12204977A JP 12204977 A JP12204977 A JP 12204977A JP S5455312 A JPS5455312 A JP S5455312A
Authority
JP
Japan
Prior art keywords
band
amplification part
narrow
voltage
signal
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
JP12204977A
Other languages
Japanese (ja)
Inventor
Hiromi Kusakabe
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP12204977A priority Critical patent/JPS5455312A/en
Publication of JPS5455312A publication Critical patent/JPS5455312A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/24—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits
    • H03D3/241—Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits the oscillator being part of a phase locked loop

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To improve a signal-to-noise ratio when a voltage is high by controlling the loop of a voltage control oscillator in a narrow-band reception state simultaneously with band switching. CONSTITUTION:After being mixed 3 with a local oscillation signal, a FM reception signal is supplied to the 1st IF amplification part 4 and a FM intermediate-wave signal which has been amplified to a fixed level with broad-band characteristics is detected 7 from the W side of band change-over switch 15 through BPF5 and the 2nd IF amplification part 6. In the narrow-band reception state at the N side of switch 15, on the other hand, the output of amplification part 4 is sent to PLL part 17 via narrow-band BPF8 and the 3rd IF amplification part 9, a carrier component from voltage control oscillator 12 is compared with FMIF in terms of phase, and the phase difference is changed into a DC component through LPF11, thereby making the loop control so that the phase difference will be eliminated. Consequently, the S/N ratio can be improved at the time when the voltage is high.
JP12204977A 1977-10-12 1977-10-12 Fm receiver Pending JPS5455312A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12204977A JPS5455312A (en) 1977-10-12 1977-10-12 Fm receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12204977A JPS5455312A (en) 1977-10-12 1977-10-12 Fm receiver

Publications (1)

Publication Number Publication Date
JPS5455312A true JPS5455312A (en) 1979-05-02

Family

ID=14826333

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12204977A Pending JPS5455312A (en) 1977-10-12 1977-10-12 Fm receiver

Country Status (1)

Country Link
JP (1) JPS5455312A (en)

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