JPS6474852A - Telephone set system - Google Patents

Telephone set system

Info

Publication number
JPS6474852A
JPS6474852A JP23115087A JP23115087A JPS6474852A JP S6474852 A JPS6474852 A JP S6474852A JP 23115087 A JP23115087 A JP 23115087A JP 23115087 A JP23115087 A JP 23115087A JP S6474852 A JPS6474852 A JP S6474852A
Authority
JP
Japan
Prior art keywords
signal
detected
speech
spite
investigation
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.)
Granted
Application number
JP23115087A
Other languages
Japanese (ja)
Other versions
JP2525623B2 (en
Inventor
Yatsuhiro Kotake
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP62231150A priority Critical patent/JP2525623B2/en
Publication of JPS6474852A publication Critical patent/JPS6474852A/en
Application granted granted Critical
Publication of JP2525623B2 publication Critical patent/JP2525623B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To always realize satisfactory speech in spite of the state of communication, by controlling the amplification degree of a signal amplifier circuit by receiving and detecting a required investigation signal according to on-hook at an incoming side. CONSTITUTION:By raising a handset 7, the on-hook switch 8 of a telephone set system TH is turned ON, and the polarity of a speech line 6 is inverted. The fact is detected by a polarity inversion detection circuit 10, and the investigation signal of a sound frequency band area is transmitted in a short period via a CPU 11 and a signal delivery circuit 12. The investigation signal is received by a device TH similar to the device at the incoming side, and is detected by a signal detection circuit 13. The CPU11 performs the automatic switching of the amplification degree of an amplifier circuit 9 at the optimum value corresponding to detected output. Therefore, it is possible to always perform the satisfactory speech in spite of the state of the communication.
JP62231150A 1987-09-17 1987-09-17 Telephone device Expired - Lifetime JP2525623B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62231150A JP2525623B2 (en) 1987-09-17 1987-09-17 Telephone device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62231150A JP2525623B2 (en) 1987-09-17 1987-09-17 Telephone device

Publications (2)

Publication Number Publication Date
JPS6474852A true JPS6474852A (en) 1989-03-20
JP2525623B2 JP2525623B2 (en) 1996-08-21

Family

ID=16919078

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62231150A Expired - Lifetime JP2525623B2 (en) 1987-09-17 1987-09-17 Telephone device

Country Status (1)

Country Link
JP (1) JP2525623B2 (en)

Also Published As

Publication number Publication date
JP2525623B2 (en) 1996-08-21

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