JPS5574471A - Frequency detecting circuit - Google Patents

Frequency detecting circuit

Info

Publication number
JPS5574471A
JPS5574471A JP14829078A JP14829078A JPS5574471A JP S5574471 A JPS5574471 A JP S5574471A JP 14829078 A JP14829078 A JP 14829078A JP 14829078 A JP14829078 A JP 14829078A JP S5574471 A JPS5574471 A JP S5574471A
Authority
JP
Japan
Prior art keywords
signal
frequency
capacitor
comparator
output
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
JP14829078A
Other languages
Japanese (ja)
Other versions
JPS6145784B2 (en
Inventor
Hideharu Tezuka
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 JP14829078A priority Critical patent/JPS5574471A/en
Publication of JPS5574471A publication Critical patent/JPS5574471A/en
Publication of JPS6145784B2 publication Critical patent/JPS6145784B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

PURPOSE: To carry out an accurate detection of frequency by causing a bistable circuit and an F-V conversion circuit to cooperate with each other thereby to convert the frequency of the signal into a DC voltage accurately even when the duty of the AC signal varies greatly.
CONSTITUTION: The non-reversing input terminal of the comparator 8 of an F-V conversion circuit 2 is connected through a capacitor charging terminal 9 to an out- side capacitor. The output end of the comparator 8 is connected to the base of the TrQ4 of an R-S FF1, and a TrQ5 which forms a capacitor discharge circuit is provided in the above mentioned terminal 9. In a case where the duty of an input signal IN varies and the pulse width is widened, when the output ϕ3 of the comparator 8 equals to 1, the FF1 cannot be reversed, and therefore the TrQ5 cannot be turned on. For this reason, the outside capacitor cannot discharge. During this time, since the output ϕ2 of the FF1 is reversed to zero, the frequency of the signal IN is reproduced with fidelity without being affected by the fall of the signal IN.
COPYRIGHT: (C)1980,JPO&Japio
JP14829078A 1978-11-30 1978-11-30 Frequency detecting circuit Granted JPS5574471A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14829078A JPS5574471A (en) 1978-11-30 1978-11-30 Frequency detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14829078A JPS5574471A (en) 1978-11-30 1978-11-30 Frequency detecting circuit

Publications (2)

Publication Number Publication Date
JPS5574471A true JPS5574471A (en) 1980-06-05
JPS6145784B2 JPS6145784B2 (en) 1986-10-09

Family

ID=15449456

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14829078A Granted JPS5574471A (en) 1978-11-30 1978-11-30 Frequency detecting circuit

Country Status (1)

Country Link
JP (1) JPS5574471A (en)

Also Published As

Publication number Publication date
JPS6145784B2 (en) 1986-10-09

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