JPS6429154A - Voice conference equipment - Google Patents
Voice conference equipmentInfo
- 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
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.
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)
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)
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 |
-
1987
- 1987-07-24 JP JP62185171A patent/JP2637106B2/en not_active Expired - Lifetime
Patent Citations (2)
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)
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 |
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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 |