JPS641358A - Hands-free telephone set - Google Patents

Hands-free telephone set

Info

Publication number
JPS641358A
JPS641358A JP15550387A JP15550387A JPS641358A JP S641358 A JPS641358 A JP S641358A JP 15550387 A JP15550387 A JP 15550387A JP 15550387 A JP15550387 A JP 15550387A JP S641358 A JPS641358 A JP S641358A
Authority
JP
Japan
Prior art keywords
hands
transmitting
led
receiving
connecting circuit
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
JP15550387A
Other languages
Japanese (ja)
Other versions
JPH011358A (en
Inventor
Shinji Mishima
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
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 filed Critical NEC Corp
Priority to JP62-155503A priority Critical patent/JPH011358A/en
Priority claimed from JP62-155503A external-priority patent/JPH011358A/en
Publication of JPS641358A publication Critical patent/JPS641358A/en
Publication of JPH011358A publication Critical patent/JPH011358A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To make the function of hands-free talking effectively usable, by informing the user of a hands-free telephone set that whether the hands-free operation of the set is in the transmitting state or receiving state by using a transmitting-receiving state displaying means when hands-free talking is made.
CONSTITUTION: A sound level comparator circuit 40 compares signals inputted from rectifier circuits 30 and 60 with each other and detects that which is higher between the receiving sound level and transmitting sound level. Moreover, an LED controlling circuit 80 connected with a transmitting sound connecting circuit 70 and receiving sound connecting circuit 50 supplies an electric current to an LED (GN) so as to cause the green LED 90 (GN) to light while the transmitting sound connecting circuit operates and an electric current to another LED 90 (RD) so as to cause the LED 90 (RD) to light while the receiving sound connecting circuit operates. Therefore, whether the telephone set is in the transmitting state or in the receiving state can be confirmed through the LEDs 90 (RD and GN).
COPYRIGHT: (C)1989,JPO&Japio
JP62-155503A 1987-06-24 hands-free telephone Pending JPH011358A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62-155503A JPH011358A (en) 1987-06-24 hands-free telephone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62-155503A JPH011358A (en) 1987-06-24 hands-free telephone

Publications (2)

Publication Number Publication Date
JPS641358A true JPS641358A (en) 1989-01-05
JPH011358A JPH011358A (en) 1989-01-05

Family

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