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JPS57101460A - Callout device for telephone - Google Patents

Callout device for telephone

Info

Publication number
JPS57101460A
JPS57101460A JP17780580A JP17780580A JPS57101460A JP S57101460 A JPS57101460 A JP S57101460A JP 17780580 A JP17780580 A JP 17780580A JP 17780580 A JP17780580 A JP 17780580A JP S57101460 A JPS57101460 A JP S57101460A
Authority
JP
Japan
Prior art keywords
callout
counted
relay
operative
preset
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
JP17780580A
Other languages
Japanese (ja)
Inventor
Yoshisuke Nakura
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.)
ADACHI JIMUSHIYO KK
ADACHI JIMUSHO KK
Original Assignee
ADACHI JIMUSHIYO KK
ADACHI JIMUSHO KK
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 ADACHI JIMUSHIYO KK, ADACHI JIMUSHO KK filed Critical ADACHI JIMUSHIYO KK
Priority to JP17780580A priority Critical patent/JPS57101460A/en
Publication of JPS57101460A publication Critical patent/JPS57101460A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/663—Preventing unauthorised calls to a telephone set
    • H04M1/665—Preventing unauthorised calls to a telephone set by checking the validity of a code

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To avoid the response to a malicious call, by ringing a call chime, only when a callout signal transmitted is predetermined number of times. CONSTITUTION:A callout signal is detected at an electromagnet pickup 4 and inputted via a BPF, waveform shape circuit M, automatic-manual switch SW3, and relay contact RY-1C to a counter CU-1, and the number of pulses is counted. The counted number is outputted as a binary number with a BCD code from an output terminal, converted into a decimal number at a decoder D-1, and when a preset callout number 3 is counted, the input to an inverter NOT-1 is at L and the output is at H, a timer T1 starts, and the base of a transistor (TR) 1 is at H. The TR1 turns on and a relay RY-1 is operative. Next, similarly, twice callout signals are inputted, and when a preset callout number 4 is counted, a relay RY-2 is operative. After the callout is made thereafter, a relay RY-3 is operative for callout.
JP17780580A 1980-12-16 1980-12-16 Callout device for telephone Pending JPS57101460A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17780580A JPS57101460A (en) 1980-12-16 1980-12-16 Callout device for telephone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17780580A JPS57101460A (en) 1980-12-16 1980-12-16 Callout device for telephone

Publications (1)

Publication Number Publication Date
JPS57101460A true JPS57101460A (en) 1982-06-24

Family

ID=16037388

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17780580A Pending JPS57101460A (en) 1980-12-16 1980-12-16 Callout device for telephone

Country Status (1)

Country Link
JP (1) JPS57101460A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5966254A (en) * 1982-10-07 1984-04-14 Sony Corp Automatic answering telephone set
JPS63187957A (en) * 1987-01-30 1988-08-03 Nec Corp Automatic answering telephone set
JPS63187956A (en) * 1987-01-30 1988-08-03 Nec Corp Automatic answering telephone set
JPS63163047U (en) * 1987-04-10 1988-10-25
JPH01177246A (en) * 1988-01-05 1989-07-13 Sanyo Electric Co Ltd Caller selecting circuit for telephone system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5966254A (en) * 1982-10-07 1984-04-14 Sony Corp Automatic answering telephone set
JPS63187957A (en) * 1987-01-30 1988-08-03 Nec Corp Automatic answering telephone set
JPS63187956A (en) * 1987-01-30 1988-08-03 Nec Corp Automatic answering telephone set
JPS63163047U (en) * 1987-04-10 1988-10-25
JPH01177246A (en) * 1988-01-05 1989-07-13 Sanyo Electric Co Ltd Caller selecting circuit for telephone system

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