JPH0362051B2 - - Google Patents

Info

Publication number
JPH0362051B2
JPH0362051B2 JP57005660A JP566082A JPH0362051B2 JP H0362051 B2 JPH0362051 B2 JP H0362051B2 JP 57005660 A JP57005660 A JP 57005660A JP 566082 A JP566082 A JP 566082A JP H0362051 B2 JPH0362051 B2 JP H0362051B2
Authority
JP
Japan
Prior art keywords
signal
terminal
frequency
counter
circuit
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.)
Expired - Lifetime
Application number
JP57005660A
Other languages
English (en)
Japanese (ja)
Other versions
JPS58123227A (ja
Inventor
Tsugio Toyama
Takashi Akao
Katsunori Hoshida
Kazunori Ishikawa
Tetsuo Myashita
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.)
Fujitsu Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Fujitsu Ltd
Nippon Telegraph and Telephone Corp
Nippon 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 Fujitsu Ltd, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical Fujitsu Ltd
Priority to JP57005660A priority Critical patent/JPS58123227A/ja
Publication of JPS58123227A publication Critical patent/JPS58123227A/ja
Publication of JPH0362051B2 publication Critical patent/JPH0362051B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/15—Indicating that frequency of pulses is either above or below a predetermined value or within or outside a predetermined range of values, by making use of non-linear or digital elements (indicating that pulse width is above or below a certain limit)

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Manipulation Of Pulses (AREA)
  • Pulse Circuits (AREA)
JP57005660A 1982-01-18 1982-01-18 信号検出回路 Granted JPS58123227A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57005660A JPS58123227A (ja) 1982-01-18 1982-01-18 信号検出回路

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57005660A JPS58123227A (ja) 1982-01-18 1982-01-18 信号検出回路

Publications (2)

Publication Number Publication Date
JPS58123227A JPS58123227A (ja) 1983-07-22
JPH0362051B2 true JPH0362051B2 (en]) 1991-09-24

Family

ID=11617258

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57005660A Granted JPS58123227A (ja) 1982-01-18 1982-01-18 信号検出回路

Country Status (1)

Country Link
JP (1) JPS58123227A (en])

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61121636A (ja) * 1984-11-19 1986-06-09 Canon Inc 信号検出方式
JPH0244451U (en]) * 1988-09-21 1990-03-27
US5392347A (en) * 1992-02-19 1995-02-21 Nec Corporation Ringing tone signal detecting circuit
KR100496859B1 (ko) 2002-08-13 2005-06-22 삼성전자주식회사 동작모드 설정기능을 가진 반도체 집적회로

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5275104A (en) * 1975-12-18 1977-06-23 Matsushita Electric Ind Co Ltd Automatic answering telephone set
JPS5912216B2 (ja) * 1978-08-30 1984-03-21 沖電気工業株式会社 周波数比較回路
JPS5537027A (en) * 1978-09-08 1980-03-14 Hitachi Ltd Frequency discriminating circuit

Also Published As

Publication number Publication date
JPS58123227A (ja) 1983-07-22

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