JPS57201308A - Frequency demodulating circuit - Google Patents

Frequency demodulating circuit

Info

Publication number
JPS57201308A
JPS57201308A JP8727981A JP8727981A JPS57201308A JP S57201308 A JPS57201308 A JP S57201308A JP 8727981 A JP8727981 A JP 8727981A JP 8727981 A JP8727981 A JP 8727981A JP S57201308 A JPS57201308 A JP S57201308A
Authority
JP
Japan
Prior art keywords
frequency
output
signal
circuit
input 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
JP8727981A
Other languages
Japanese (ja)
Inventor
Shunichi Wada
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8727981A priority Critical patent/JPS57201308A/en
Publication of JPS57201308A publication Critical patent/JPS57201308A/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
    • H03D3/04—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)

Abstract

PURPOSE:To improve the demodulation sensitivity without damaging the linearity of the demodulated output, by making an arrangement that the output time width of the output frequency is simultaneously changed in accordance with the change in the frequency of signals modulated in the frequency. CONSTITUTION:An input signal V61 modulated in frequency is applied upon a reset terminal R of a flip-flop (FF) 52 through a voltage controlling phase shifting circuit 51, and, at the same time, directly applied upon a set terminal S of the FF 52. When the delay time of the circuit 51 is represented as ntau1, an output signal V63 of the FF 52 becomes a signal whose time width is gradually expanded as the frequency of the input signal V61 rises. Therefore, a demodulated output signal V64 obtained through a low-pass filter 2 responds to the frequency change of the input signal with a high sensitivity and becomes a signal which changes the DC level. Moreover, the output of the FF 52 is returned to the circuit 51 through a loop filter 53.
JP8727981A 1981-06-03 1981-06-03 Frequency demodulating circuit Pending JPS57201308A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8727981A JPS57201308A (en) 1981-06-03 1981-06-03 Frequency demodulating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8727981A JPS57201308A (en) 1981-06-03 1981-06-03 Frequency demodulating circuit

Publications (1)

Publication Number Publication Date
JPS57201308A true JPS57201308A (en) 1982-12-09

Family

ID=13910338

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8727981A Pending JPS57201308A (en) 1981-06-03 1981-06-03 Frequency demodulating circuit

Country Status (1)

Country Link
JP (1) JPS57201308A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6022625A (en) * 1983-07-18 1985-02-05 Kubota Ltd Ultrasonic detection type karman's vortex street current meter
JPS60149229U (en) * 1984-03-13 1985-10-03 パイオニア株式会社 FM demodulation circuit
JPS62159006U (en) * 1986-03-31 1987-10-08
JP2002321202A (en) * 2001-04-27 2002-11-05 Okada Kinzoku Kogyosho:Kk Saw-tooth

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6022625A (en) * 1983-07-18 1985-02-05 Kubota Ltd Ultrasonic detection type karman's vortex street current meter
JPH0140299B2 (en) * 1983-07-18 1989-08-28 Kubota Tetsuko Kk
JPS60149229U (en) * 1984-03-13 1985-10-03 パイオニア株式会社 FM demodulation circuit
JPH0424648Y2 (en) * 1984-03-13 1992-06-11
JPS62159006U (en) * 1986-03-31 1987-10-08
JP2002321202A (en) * 2001-04-27 2002-11-05 Okada Kinzoku Kogyosho:Kk Saw-tooth

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