JPS6429154A - Voice conference equipment - Google Patents

Voice conference equipment

Info

Publication number
JPS6429154A
JPS6429154A JP18517187A JP18517187A JPS6429154A JP S6429154 A JPS6429154 A JP S6429154A JP 18517187 A JP18517187 A JP 18517187A JP 18517187 A JP18517187 A JP 18517187A JP S6429154 A JPS6429154 A JP S6429154A
Authority
JP
Japan
Prior art keywords
gain
speaker
circuit
sound volume
microphones
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
JP18517187A
Other languages
Japanese (ja)
Other versions
JP2637106B2 (en
Inventor
Shoji Makino
Nobuo Koizumi
Mizuhiro Hida
Naohide Kushige
Takashi Saeki
Shigenobu Minami
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
Nippon Telegraph and Telephone Corp
Original Assignee
Toshiba Corp
Nippon Telegraph and Telephone 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 Toshiba Corp, Nippon Telegraph and Telephone Corp filed Critical Toshiba Corp
Priority to JP62185171A priority Critical patent/JP2637106B2/en
Publication of JPS6429154A publication Critical patent/JPS6429154A/en
Application granted granted Critical
Publication of JP2637106B2 publication Critical patent/JP2637106B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

PURPOSE:To progress a conference smoothly by providing a gain control circuit inserting a variable gain circuit to each output of plural microphones and varying the gain of the variable gain circuit in response to the output voice signal level of the corresponding microphone so as to generate a voice with sufficient sound volume from a speaker even when the speaker and the microphone are approached. CONSTITUTION:Gain variable circuits 13a, 13b are controlled to a gain where an input level to an adder circuit 8 is a reference value or below independently of the acoustic coupling condition with corresponding microphones 6a, 6b and a speaker 5. Then the reference value used for a control circuit 12 is made correspondent to a cancel enable level of a bypass component in an echo cancellation circuit 2 to ensure the cancellation of the bypass component independently of the acoustic coupling condition between the microphones 6a, 6b and the speaker 5. In this case, the sound volume of the speaker 5 is fixed to the gain set in the amplifier circuit 4, then the voice from the opposite party is sounded with a sufficient sound volume.
JP62185171A 1987-07-24 1987-07-24 Audio conference equipment Expired - Lifetime JP2637106B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62185171A JP2637106B2 (en) 1987-07-24 1987-07-24 Audio conference equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62185171A JP2637106B2 (en) 1987-07-24 1987-07-24 Audio conference equipment

Publications (2)

Publication Number Publication Date
JPS6429154A true JPS6429154A (en) 1989-01-31
JP2637106B2 JP2637106B2 (en) 1997-08-06

Family

ID=16166075

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62185171A Expired - Lifetime JP2637106B2 (en) 1987-07-24 1987-07-24 Audio conference equipment

Country Status (1)

Country Link
JP (1) JP2637106B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60216219A (en) * 1984-04-12 1985-10-29 Yokogawa Hokushin Electric Corp Color recorder
EP0605960A1 (en) * 1992-12-31 1994-07-13 AT&T Corp. A technique for reducing echoes in conference communications
US6282296B1 (en) * 1998-04-15 2001-08-28 Matsushita Electric Industrial Co., Ltd. Audio reproducing apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60116268A (en) * 1983-11-26 1985-06-22 Nec Corp Conference telephone set
JPS61260752A (en) * 1985-05-14 1986-11-18 Nec Corp Acoustic detour signal suppressing circuit of conference talking device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60116268A (en) * 1983-11-26 1985-06-22 Nec Corp Conference telephone set
JPS61260752A (en) * 1985-05-14 1986-11-18 Nec Corp Acoustic detour signal suppressing circuit of conference talking device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60216219A (en) * 1984-04-12 1985-10-29 Yokogawa Hokushin Electric Corp Color recorder
EP0605960A1 (en) * 1992-12-31 1994-07-13 AT&T Corp. A technique for reducing echoes in conference communications
US5363441A (en) * 1992-12-31 1994-11-08 At&T Bell Laboratories Technique for reducing echoes in conference communications
US6282296B1 (en) * 1998-04-15 2001-08-28 Matsushita Electric Industrial Co., Ltd. Audio reproducing apparatus

Also Published As

Publication number Publication date
JP2637106B2 (en) 1997-08-06

Similar Documents

Publication Publication Date Title
JPS56147525A (en) Reception playback system
CA2101228A1 (en) Active acoustic attenuation system with power limiting
DK0412902T3 (en) Electroacoustic device for hearing impaired containing noise balancing
MY106871A (en) Noise reducing receiver device.
GB1458663A (en) Microphone circuits
CA2154348A1 (en) Ear defenders employing active noise control
EP0717547A3 (en) Automaticaly variable circuit of sound level of received voice signal in telephone
CA2192498A1 (en) Microphone Expansion for Background Noise Reduction
US5233661A (en) Sound field variable apparatus
JPS58210747A (en) Loudspeaking telephone set and controlling method therefor
JPS6429154A (en) Voice conference equipment
AU7772387A (en) Ambient noise suppression in hands-free telephone
JPS6429094A (en) Echo erasing device
JPS6424659A (en) Voice conference equipment
JP2001094479A (en) Echo canceler
JPS6429153A (en) Voice conference equipment
JPS6444612A (en) Sound volume adjusting circuit
FR2856869A1 (en) Acoustic signal processing system for telephone set, has multiplier applying transfer function of automatic gain control unit to input of echo canceller device such that signals are manipulated by function related to transfer function
KR920020873A (en) Training method of voice communication device and acoustic echo canceller
JPS57162592A (en) Echo preventing loudspeaking device
JPS5553965A (en) Loudspeading simultaneous talking interphone system
JPS595919Y2 (en) echo microphone
DE3267545D1 (en) Apparatus to generate noise and device to control the acoustic insulation in buildings
JPS6424667A (en) Voice conference equipment
KR830001727B1 (en) Howling Suppression of Voice Amplifier

Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term
FPAY Renewal fee payment (prs date is renewal date of database)

Year of fee payment: 11

Free format text: PAYMENT UNTIL: 20080425