JPS55162606A - Fm demodulation system and its circuit - Google Patents

Fm demodulation system and its circuit

Info

Publication number
JPS55162606A
JPS55162606A JP7146479A JP7146479A JPS55162606A JP S55162606 A JPS55162606 A JP S55162606A JP 7146479 A JP7146479 A JP 7146479A JP 7146479 A JP7146479 A JP 7146479A JP S55162606 A JPS55162606 A JP S55162606A
Authority
JP
Japan
Prior art keywords
wave
trapezoid
2deltat
deltaav
deltaf
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.)
Granted
Application number
JP7146479A
Other languages
Japanese (ja)
Other versions
JPS6329442B2 (en
Inventor
Jinko Handa
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.)
Onkyo Corp
Original Assignee
Onkyo Corp
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 Onkyo Corp filed Critical Onkyo Corp
Priority to JP7146479A priority Critical patent/JPS55162606A/en
Publication of JPS55162606A publication Critical patent/JPS55162606A/en
Publication of JPS6329442B2 publication Critical patent/JPS6329442B2/ja
Granted 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
    • H03D3/04—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by counting or integrating cycles of oscillations

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuits Of Receivers In General (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To make broad the demodulation frequency band and to increase the linearity, by converting FM wave into a rectangular wave in a FM demodulation system and converting further it to the trapezoid wave in which the pulse width is changed proportional to the frequency shift and obtaining a low frequency signal from the average value of the trapezoid wave. CONSTITUTION:The waveform of the FM wave (b) is shaped through an amplitude limit amplifying circuit 1, after the amplitude limit, further through a waveform shaping circuit 2 to convert the wave into a rectangular wave having the same frequency shift as that of FM wave (b). Further, this rectangular wave is converted into a triangle wave through a triangle wave generating circuit 3, the amplitude is limited and converted into the trapezoid wave (e). After that, the low frequency signal (f) is obtained through the LPF4. That is, the average value of the trapezoid wave (f) is given as Av=Ao (1-to/t), and the increment of the average voltage when the pulse width (t) of the trapezoid wave (f) is changed by DELTAt, DELTAAv=Aoto (1/t-1/(t+2DELTAt). Assuming t=1/f, the decrement of frequency when the increment of 2DELTAt as DELTAf, and t+2DELTAt=1/(f-DELTAf), then DELTAAv=AotoDELTAf, that is the increment DELTAAv of the average (demodulation signal) is proportional to DELTAf of the frequency decrement of the trapezoid wave.
JP7146479A 1979-06-06 1979-06-06 Fm demodulation system and its circuit Granted JPS55162606A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7146479A JPS55162606A (en) 1979-06-06 1979-06-06 Fm demodulation system and its circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7146479A JPS55162606A (en) 1979-06-06 1979-06-06 Fm demodulation system and its circuit

Publications (2)

Publication Number Publication Date
JPS55162606A true JPS55162606A (en) 1980-12-18
JPS6329442B2 JPS6329442B2 (en) 1988-06-14

Family

ID=13461330

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7146479A Granted JPS55162606A (en) 1979-06-06 1979-06-06 Fm demodulation system and its circuit

Country Status (1)

Country Link
JP (1) JPS55162606A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5640306A (en) * 1979-09-10 1981-04-16 Onkyo Corp Fm demodulating system and its circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4715211U (en) * 1971-03-22 1972-10-23

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4715211U (en) * 1971-03-22 1972-10-23

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5640306A (en) * 1979-09-10 1981-04-16 Onkyo Corp Fm demodulating system and its circuit

Also Published As

Publication number Publication date
JPS6329442B2 (en) 1988-06-14

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