JPS56153897A - Receiving device for push-button telephone signal - Google Patents

Receiving device for push-button telephone signal

Info

Publication number
JPS56153897A
JPS56153897A JP5741680A JP5741680A JPS56153897A JP S56153897 A JPS56153897 A JP S56153897A JP 5741680 A JP5741680 A JP 5741680A JP 5741680 A JP5741680 A JP 5741680A JP S56153897 A JPS56153897 A JP S56153897A
Authority
JP
Japan
Prior art keywords
signal
frequency
threshold
band
calculation
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
JP5741680A
Other languages
English (en)
Inventor
Tadaharu Kato
Takao Nishitani
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP5741680A priority Critical patent/JPS56153897A/ja
Priority to US06/251,829 priority patent/US4395595A/en
Priority to FR8107177A priority patent/FR2481542A1/fr
Priority to CA000375974A priority patent/CA1155985A/en
Publication of JPS56153897A publication Critical patent/JPS56153897A/ja
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
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
JP5741680A 1980-04-23 1980-04-30 Receiving device for push-button telephone signal Pending JPS56153897A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP5741680A JPS56153897A (en) 1980-04-30 1980-04-30 Receiving device for push-button telephone signal
US06/251,829 US4395595A (en) 1980-04-23 1981-04-07 Digital pushbutton signalling receiver
FR8107177A FR2481542A1 (fr) 1980-04-23 1981-04-09 Recepteur de signalisation numerique a bouton-poussoir
CA000375974A CA1155985A (en) 1980-04-23 1981-04-22 Digital pushbutton signalling receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5741680A JPS56153897A (en) 1980-04-30 1980-04-30 Receiving device for push-button telephone signal

Publications (1)

Publication Number Publication Date
JPS56153897A true JPS56153897A (en) 1981-11-28

Family

ID=13055038

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5741680A Pending JPS56153897A (en) 1980-04-23 1980-04-30 Receiving device for push-button telephone signal

Country Status (1)

Country Link
JP (1) JPS56153897A (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007040728A (ja) * 2005-08-01 2007-02-15 Toshiba Corp 制御棒駆動機構

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5173809A (ja) * 1974-12-23 1976-06-26 Nippon Electric Co
JPS56149889A (en) * 1980-04-23 1981-11-19 Nec Corp Push-botton telephone signal receiving system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5173809A (ja) * 1974-12-23 1976-06-26 Nippon Electric Co
JPS56149889A (en) * 1980-04-23 1981-11-19 Nec Corp Push-botton telephone signal receiving system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007040728A (ja) * 2005-08-01 2007-02-15 Toshiba Corp 制御棒駆動機構

Similar Documents

Publication Publication Date Title
JPS53108481A (en) Digital frequency analyzer
JPS5537027A (en) Frequency discriminating circuit
JPS56153897A (en) Receiving device for push-button telephone signal
JPS5391612A (en) Receiver for multiple frequency signal
JPS5231618A (en) Input system of pushbutton switch signal
JPS5231630A (en) Test ethod of digital equipment
JPS5232655A (en) Logic low-pass filter circuit
JPS55110969A (en) Automatic antenna tracking apparatus
JPS5438701A (en) Automatic channel selector for electronic tuner
JPS54117605A (en) Multi-frequency signal receiving circuit
JPS56114442A (en) Frequency dividing circuit
JPS5441781A (en) Frequency discrimination circuit
JPS5393276A (en) Sequence control equipment
JPS56149889A (en) Push-botton telephone signal receiving system
JPS6431073A (en) Guiding equipment
JPS52152104A (en) Multi-frequency signal receiver
JPS5446460A (en) Supervisory equipment for coder-decoder
JPS52152105A (en) Multi-frequency signal receiver
JPS51113518A (en) Multifrequency signal receiver
JPS52105711A (en) Fm receiver
JPS5434670A (en) Freqency discriminator
JPS56106434A (en) Eliminating circuit of multipath distortion
JPS5244106A (en) Multi-frequency signal receiver
JPS5437555A (en) Rat race circuit
JPS538044A (en) Detector