JPS62195963A - Talking state detector - Google Patents

Talking state detector

Info

Publication number
JPS62195963A
JPS62195963A JP3750186A JP3750186A JPS62195963A JP S62195963 A JPS62195963 A JP S62195963A JP 3750186 A JP3750186 A JP 3750186A JP 3750186 A JP3750186 A JP 3750186A JP S62195963 A JPS62195963 A JP S62195963A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
current
tr
telephone set
talking state
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
JP3750186A
Inventor
Yoshiaki Nakano
Shigeo Sano
Takashi Tabu
Original Assignee
Fujitsu 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

Links

Abstract

PURPOSE: To detect the talking state by allowing a talking state detector to detect a loop current directly and display it when a subscriber hooks off a handset so as to display that the telephone set is in the hook-off state.
CONSTITUTION: At the time of the handset of a telephone set 3 is hooked off and the off-hook state is attained, a loop current I flows through the telephone set 3 via a talking state detector 2 from a station 1 and a Zener voltage V is generated between terminals of the 2nd Zener diode 26. Thus, a voltage (V-Vbe) is generated across a resistor 23 via an emitter of a transistor (TR) 22 and a current of (V-Vbe)/R1 (resistance of resistor 23) flows to an emitter circuit of the TR 22, then, the collector circuit, supposing that the current amplification factor β of the TR 22 is sufficiently large. Since the V in equation is a terminal voltage of the Zener diode 26, the current is constant and the current flowing to a light emitting diode 21 is kept within a prescribed range decided by the brightness and rated power of the light emitting diode 21.
COPYRIGHT: (C)1987,JPO&Japio
JP3750186A 1986-02-24 1986-02-24 Talking state detector Pending JPS62195963A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3750186A JPS62195963A (en) 1986-02-24 1986-02-24 Talking state detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3750186A JPS62195963A (en) 1986-02-24 1986-02-24 Talking state detector

Publications (1)

Publication Number Publication Date
JPS62195963A true true JPS62195963A (en) 1987-08-29

Family

ID=12499272

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3750186A Pending JPS62195963A (en) 1986-02-24 1986-02-24 Talking state detector

Country Status (1)

Country Link
JP (1) JPS62195963A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5100658A (en) * 1989-08-07 1992-03-31 The Procter & Gamble Company Vehicle systems for use in cosmetic compositions
US5104646A (en) * 1989-08-07 1992-04-14 The Procter & Gamble Company Vehicle systems for use in cosmetic compositions
US5106609A (en) * 1990-05-01 1992-04-21 The Procter & Gamble Company Vehicle systems for use in cosmetic compositions
US5277899A (en) * 1991-10-15 1994-01-11 The Procter & Gamble Company Hair setting composition with combination of cationic conditioners
US5843418A (en) * 1991-03-19 1998-12-01 The Procter & Gamble Co. Cosmetic compositions containing hydrophobically modified nonionic polymer and unsaturated quaternary ammonium surfactant

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5100658A (en) * 1989-08-07 1992-03-31 The Procter & Gamble Company Vehicle systems for use in cosmetic compositions
US5104646A (en) * 1989-08-07 1992-04-14 The Procter & Gamble Company Vehicle systems for use in cosmetic compositions
US5106609A (en) * 1990-05-01 1992-04-21 The Procter & Gamble Company Vehicle systems for use in cosmetic compositions
US5843418A (en) * 1991-03-19 1998-12-01 The Procter & Gamble Co. Cosmetic compositions containing hydrophobically modified nonionic polymer and unsaturated quaternary ammonium surfactant
US5855878A (en) * 1991-03-19 1999-01-05 The Procter & Gamble Company Cosmetic compositions containing hydrophobically modified nonionic polymer and unsaturated quaternary ammonium surfactant
US5277899A (en) * 1991-10-15 1994-01-11 The Procter & Gamble Company Hair setting composition with combination of cationic conditioners

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