JPS574646A - Switch box system - Google Patents

Switch box system

Info

Publication number
JPS574646A
JPS574646A JP7801180A JP7801180A JPS574646A JP S574646 A JPS574646 A JP S574646A JP 7801180 A JP7801180 A JP 7801180A JP 7801180 A JP7801180 A JP 7801180A JP S574646 A JPS574646 A JP S574646A
Authority
JP
Japan
Prior art keywords
circuit
switch box
state
audible
lamp
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
JP7801180A
Other languages
Japanese (ja)
Inventor
Hideo Takahashi
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 JP7801180A priority Critical patent/JPS574646A/en
Publication of JPS574646A publication Critical patent/JPS574646A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
    • H04M3/62—Keyboard equipment

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)

Abstract

PURPOSE:To realize a use of a switch box for a blind operator, by detecting optically the on-and-off state of a lamp provided on the control face of the switch box and converting the on-and-off state into audible signals. CONSTITUTION:The on-and-off state of a lamp on the control face of a switch box is detected by a photoelectric detecting circuit PHOS containing a photodiode, a phototransistor and others and then converted into electric signals to be amplified by an amplifying circuit AMP. At the same time, the audible signals produced by an audible signal generating circuit OSC are converted into the variation of audible signals in accordance with the on-and-off state of the lamp on the control face through an audible signal control circuit ATCNT. This variation of audible signals is supplied to a telephone receiving circuit through a mixing circuit MIX and then sent to a telephone receiver R.
JP7801180A 1980-06-10 1980-06-10 Switch box system Pending JPS574646A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7801180A JPS574646A (en) 1980-06-10 1980-06-10 Switch box system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7801180A JPS574646A (en) 1980-06-10 1980-06-10 Switch box system

Publications (1)

Publication Number Publication Date
JPS574646A true JPS574646A (en) 1982-01-11

Family

ID=13649841

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7801180A Pending JPS574646A (en) 1980-06-10 1980-06-10 Switch box system

Country Status (1)

Country Link
JP (1) JPS574646A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3519117A1 (en) 1984-05-28 1985-11-28 Dainippon Ink And Chemicals, Inc., Tokio/Tokyo RESINABLE RESIN THROUGH ACTIVATING ENERGY
JPS61145214A (en) * 1984-12-18 1986-07-02 Sony Corp Photocurable photosensitive composition

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3519117A1 (en) 1984-05-28 1985-11-28 Dainippon Ink And Chemicals, Inc., Tokio/Tokyo RESINABLE RESIN THROUGH ACTIVATING ENERGY
US4690987A (en) * 1984-05-28 1987-09-01 Dainippon Ink And Chemicals, Inc. Activation energy-curable resin composition
JPS61145214A (en) * 1984-12-18 1986-07-02 Sony Corp Photocurable photosensitive composition

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