JPS6424659A - Voice conference equipment - Google Patents

Voice conference equipment

Info

Publication number
JPS6424659A
JPS6424659A JP18144487A JP18144487A JPS6424659A JP S6424659 A JPS6424659 A JP S6424659A JP 18144487 A JP18144487 A JP 18144487A JP 18144487 A JP18144487 A JP 18144487A JP S6424659 A JPS6424659 A JP S6424659A
Authority
JP
Japan
Prior art keywords
gain
circuit
microphone
variable
speaker
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
JP18144487A
Other languages
Japanese (ja)
Inventor
Hiroshi Oikawa
Masakazu Nishino
Shoji Makino
Takashi Saeki
Naohide Kushige
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 JP18144487A priority Critical patent/JPS6424659A/en
Publication of JPS6424659A publication Critical patent/JPS6424659A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To use the titled equipment without losing the performance of an echo cancelling circuit even when a speaker and a microphone are approached by approaching a bypass quantity by acoustic coupling to an always constant level not giving hindrance for the convergence of an echo canceller circuit. CONSTITUTION:A prescribed test signal is generated at the initial state and given to a reception line. A gain control circuit 17 compares an output from an amplifier circuit 14 for microphone with a preset reference value to calculate a gain variable setting signal thereby decreasing the gain of the variable gain circuit 16 when the output is larger than the reference value. Then the output of the gain control circuit 17 is latched while being switched to the value calculated at the leading of the control signal input and the gain of the gain variable circuit 16 is kept to a value subject to variable control. Thus, even when the speaker and microphone are approached, the convergence of the echo cancelling circuit is applied normally, then the bypassed voice due to the acoustic coupling between the speaker and the microphone is lost and the equipment hardly depending on the conditions in a conference room is obtained.
JP18144487A 1987-07-21 1987-07-21 Voice conference equipment Pending JPS6424659A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18144487A JPS6424659A (en) 1987-07-21 1987-07-21 Voice conference equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18144487A JPS6424659A (en) 1987-07-21 1987-07-21 Voice conference equipment

Publications (1)

Publication Number Publication Date
JPS6424659A true JPS6424659A (en) 1989-01-26

Family

ID=16100876

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18144487A Pending JPS6424659A (en) 1987-07-21 1987-07-21 Voice conference equipment

Country Status (1)

Country Link
JP (1) JPS6424659A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5131435A (en) * 1990-04-19 1992-07-21 Tsudakoma Corporation On loom warp mending operation
US7839389B2 (en) 2005-09-29 2010-11-23 Kabushiki Kaisha Toshiba Information processing equipment and method for determining the priority of input keys thereof
US7909698B2 (en) 2003-09-12 2011-03-22 Namco Bandai Games, Inc. Input device, input determination method, game system, game system control method, program, and information storage medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5131435A (en) * 1990-04-19 1992-07-21 Tsudakoma Corporation On loom warp mending operation
US7909698B2 (en) 2003-09-12 2011-03-22 Namco Bandai Games, Inc. Input device, input determination method, game system, game system control method, program, and information storage medium
US7839389B2 (en) 2005-09-29 2010-11-23 Kabushiki Kaisha Toshiba Information processing equipment and method for determining the priority of input keys thereof

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