JPS6420761A - Telephone terminal - Google Patents

Telephone terminal

Info

Publication number
JPS6420761A
JPS6420761A JP17767987A JP17767987A JPS6420761A JP S6420761 A JPS6420761 A JP S6420761A JP 17767987 A JP17767987 A JP 17767987A JP 17767987 A JP17767987 A JP 17767987A JP S6420761 A JPS6420761 A JP S6420761A
Authority
JP
Japan
Prior art keywords
noise
value
level
gain
transmission system
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
JP17767987A
Other languages
Japanese (ja)
Other versions
JPH06101760B2 (en
Inventor
Toshiro Oga
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.)
Fujitsu Ltd
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
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP62177679A priority Critical patent/JPH06101760B2/en
Priority to CA000571870A priority patent/CA1291837C/en
Priority to US07/219,607 priority patent/US4908855A/en
Priority to EP88111401A priority patent/EP0299507B1/en
Priority to AU19078/88A priority patent/AU601861B2/en
Priority to DE3887786T priority patent/DE3887786T2/en
Publication of JPS6420761A publication Critical patent/JPS6420761A/en
Publication of JPH06101760B2 publication Critical patent/JPH06101760B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To attain natural speech quality under low noise and to attain excellent noise suppression effects under high noise by controlling the noise suppression effects of a transmission system in response to the output from a detection microphone. CONSTITUTION:A variable attenuator 12 bringing a gain of the transmission system to a constant value at all times when the input sound pressure level of a transmitter 1 is higher than a prescribed threshold value and to a lower value than a fixed value when the input level is equal to or less than the threshold value, a microphone 3 detecting surrounding noise, and a control means for receiving a signal in response to the level of the noise from the output of the microphone to control the variable attenuator, are provided. When the surrounding noise level is high, the variable part of the gain of the transmission system is brought to a lower value than the fixed constant value and when the surrounding noise is low, the variable part of the gain is brought to a value close to the fixed constant value by controlling the variable attenuator 12. Thus, natural speech characteristics are realized.
JP62177679A 1987-07-15 1987-07-15 Telephone terminal Expired - Lifetime JPH06101760B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP62177679A JPH06101760B2 (en) 1987-07-15 1987-07-15 Telephone terminal
CA000571870A CA1291837C (en) 1987-07-15 1988-07-13 Electronic telephone terminal having noise suppression function
US07/219,607 US4908855A (en) 1987-07-15 1988-07-15 Electronic telephone terminal having noise suppression function
EP88111401A EP0299507B1 (en) 1987-07-15 1988-07-15 Electronic telephone terminal having noise suppression function
AU19078/88A AU601861B2 (en) 1987-07-15 1988-07-15 Electronic telephone terminal having noise suppression function
DE3887786T DE3887786T2 (en) 1987-07-15 1988-07-15 Electronic telecommunication device with noise reduction function.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62177679A JPH06101760B2 (en) 1987-07-15 1987-07-15 Telephone terminal

Publications (2)

Publication Number Publication Date
JPS6420761A true JPS6420761A (en) 1989-01-24
JPH06101760B2 JPH06101760B2 (en) 1994-12-12

Family

ID=16035210

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62177679A Expired - Lifetime JPH06101760B2 (en) 1987-07-15 1987-07-15 Telephone terminal

Country Status (1)

Country Link
JP (1) JPH06101760B2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4831361A (en) * 1971-08-28 1973-04-24
JPS528126A (en) * 1975-07-04 1977-01-21 Japan Exlan Co Ltd Process for manufacturing flame- retarded acrylic fibers with improved fiber properties
JPS57115765U (en) * 1981-12-01 1982-07-17

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4831361A (en) * 1971-08-28 1973-04-24
JPS528126A (en) * 1975-07-04 1977-01-21 Japan Exlan Co Ltd Process for manufacturing flame- retarded acrylic fibers with improved fiber properties
JPS57115765U (en) * 1981-12-01 1982-07-17

Also Published As

Publication number Publication date
JPH06101760B2 (en) 1994-12-12

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