JPS5731289A - Dial signal receiver - Google Patents

Dial signal receiver

Info

Publication number
JPS5731289A
JPS5731289A JP10622880A JP10622880A JPS5731289A JP S5731289 A JPS5731289 A JP S5731289A JP 10622880 A JP10622880 A JP 10622880A JP 10622880 A JP10622880 A JP 10622880A JP S5731289 A JPS5731289 A JP S5731289A
Authority
JP
Japan
Prior art keywords
circuit
impulse
pulse
level
decides
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
JP10622880A
Other languages
Japanese (ja)
Inventor
Hiroshi Tane
Ryoichi Himeno
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.)
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Original Assignee
Nippon Telegraph and Telephone Corp
Oki Electric Industry 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 Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP10622880A priority Critical patent/JPS5731289A/en
Publication of JPS5731289A publication Critical patent/JPS5731289A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of dc pulses

Abstract

PURPOSE:To realize the application of a dial pulse even with intervention of a device that gives no permission of pass to the DC component, by counting the impulses caused by the dial pulse that passed through a device that passes only the AC component. CONSTITUTION:The impulse caused by a dial pulse is turned into a DC waveform through a rectifying/smoothing circuit A to be applied to a comparator A, a B-level storage circuit LM and a detecting circuit DET. The circuit DET delivers a pulse only when the first impulse arrives; and the circuit LM monitors the maximum level of a DC waveform in a period during which an output pulse exists and decides either level A or B for the input to then store it. Comparators CA and CB transmit the output pulse to a counting circuit CNT every time it decides the impulse based on the level stored in the circuit LM. The reference of comparison is set up with the first impulse to cope with different conditions of a transmission line. Timers TIMA and TIMB have the guarding function to the noise.
JP10622880A 1980-08-01 1980-08-01 Dial signal receiver Pending JPS5731289A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10622880A JPS5731289A (en) 1980-08-01 1980-08-01 Dial signal receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10622880A JPS5731289A (en) 1980-08-01 1980-08-01 Dial signal receiver

Publications (1)

Publication Number Publication Date
JPS5731289A true JPS5731289A (en) 1982-02-19

Family

ID=14428263

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10622880A Pending JPS5731289A (en) 1980-08-01 1980-08-01 Dial signal receiver

Country Status (1)

Country Link
JP (1) JPS5731289A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62169597A (en) * 1985-11-25 1987-07-25 ブリテイシユ・テレコミユニケ−シヨンズ・パブリツク・リミテツド・カンパニ Dial pulse detection

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62169597A (en) * 1985-11-25 1987-07-25 ブリテイシユ・テレコミユニケ−シヨンズ・パブリツク・リミテツド・カンパニ Dial pulse detection

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