JPS564904A - Method and device for demodulating frequency-modulated wave - Google Patents

Method and device for demodulating frequency-modulated wave

Info

Publication number
JPS564904A
JPS564904A JP7907679A JP7907679A JPS564904A JP S564904 A JPS564904 A JP S564904A JP 7907679 A JP7907679 A JP 7907679A JP 7907679 A JP7907679 A JP 7907679A JP S564904 A JPS564904 A JP S564904A
Authority
JP
Japan
Prior art keywords
time
output
modulated wave
frequency
wave
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
JP7907679A
Other languages
Japanese (ja)
Inventor
Mitsuru Yamaura
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 JP7907679A priority Critical patent/JPS564904A/en
Publication of JPS564904A publication Critical patent/JPS564904A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To shorten a delay time by reading the relative time of the zero point of a frequency-modulated wave and then by calculating the reciprocal number of its time period. CONSTITUTION:Rectangular-wave output S of shaping circuit 1 which shapes reception input R of a frequency-modulated wave is used as a control input and count output TM of counter 5 for clock pulse CP is held in register 6 at the rising point in time. At time t1, arithmetic processing part 7 is interrupted by rectangular wave output S to remember output TR of register 6. At the same time, processing part 7 reads out of a memory part the previously read-in and stored value of time t0 and calculates the calculation time of a difference of time t0-t1 to generate arithmetic output D at time t1'. Similary, interruption is caused at times t2-t7 and the calculation time is obtained at times t2'-t7'. Output D obtained in this way is the reciprocal number of the cycle of reception input R, which is the demodulation output of the frequency-modulated wave.
JP7907679A 1979-06-25 1979-06-25 Method and device for demodulating frequency-modulated wave Pending JPS564904A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7907679A JPS564904A (en) 1979-06-25 1979-06-25 Method and device for demodulating frequency-modulated wave

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7907679A JPS564904A (en) 1979-06-25 1979-06-25 Method and device for demodulating frequency-modulated wave

Publications (1)

Publication Number Publication Date
JPS564904A true JPS564904A (en) 1981-01-19

Family

ID=13679793

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7907679A Pending JPS564904A (en) 1979-06-25 1979-06-25 Method and device for demodulating frequency-modulated wave

Country Status (1)

Country Link
JP (1) JPS564904A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5963513U (en) * 1982-10-20 1984-04-26 パイオニア株式会社 Detection circuit
JPS62163405A (en) * 1986-01-13 1987-07-20 Ayao Miura Demodulator of frequency modulation wave

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5963513U (en) * 1982-10-20 1984-04-26 パイオニア株式会社 Detection circuit
JPS62163405A (en) * 1986-01-13 1987-07-20 Ayao Miura Demodulator of frequency modulation wave

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