JPS5744370A - Acoustic coupler - Google Patents

Acoustic coupler

Info

Publication number
JPS5744370A
JPS5744370A JP11927580A JP11927580A JPS5744370A JP S5744370 A JPS5744370 A JP S5744370A JP 11927580 A JP11927580 A JP 11927580A JP 11927580 A JP11927580 A JP 11927580A JP S5744370 A JPS5744370 A JP S5744370A
Authority
JP
Japan
Prior art keywords
resistance
point
acoustic
output
battery voltage
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
JP11927580A
Other languages
Japanese (ja)
Inventor
Chuji Watabe
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP11927580A priority Critical patent/JPS5744370A/en
Publication of JPS5744370A publication Critical patent/JPS5744370A/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
    • H04M1/02—Constructional features of telephone sets
    • H04M1/21—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads
    • H04M1/215—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads by non-intrusive coupling means, e.g. acoustic couplers
    • H04M1/2155—Acoustic coupling

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To prevent abnormal transmission and reception of an acoustic coupler which uses batteries as a power source, by detecting a voltage drop right before abnormal reception is caused by a battery voltage drop and by giving the indication to an operator while stopping an acoustic output. CONSTITUTION:Key input data obtained from a key input part 11 is held in a buffer incorporated in a control part 12, and the logical level signal of the data is converted into an acoustic frequency signal by an output part 13 to drive the speaker 15 of an acoustic coupler 16. At a battery part 14, on the other hand, a battery voltage E is stabilized by a Zener diode CR2 through a resistance R5 and supplied to each part through a line 27. A potential obtained at point A by a resistance R1 and a variable resistor VR1 and a reference potential obtained by a resistance R2 and a Zener diode CR1 are compared mutually by a comparator 22 and when the battery voltage drops and the potential at point A drops below that at a point B, the output of the comparator 22 sets an FF23 to turn on an LED24, thereby stopping the operation by the control part 12.
JP11927580A 1980-08-29 1980-08-29 Acoustic coupler Pending JPS5744370A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11927580A JPS5744370A (en) 1980-08-29 1980-08-29 Acoustic coupler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11927580A JPS5744370A (en) 1980-08-29 1980-08-29 Acoustic coupler

Publications (1)

Publication Number Publication Date
JPS5744370A true JPS5744370A (en) 1982-03-12

Family

ID=14757333

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11927580A Pending JPS5744370A (en) 1980-08-29 1980-08-29 Acoustic coupler

Country Status (1)

Country Link
JP (1) JPS5744370A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06292824A (en) * 1992-04-15 1994-10-21 Georg Fischer Foundry Syst Ltd Device for mixing and preparing free flowing material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06292824A (en) * 1992-04-15 1994-10-21 Georg Fischer Foundry Syst Ltd Device for mixing and preparing free flowing material

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