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JPS642424A - Howling suppression device - Google Patents

Howling suppression device

Info

Publication number
JPS642424A
JPS642424A JP15822987A JP15822987A JPS642424A JP S642424 A JPS642424 A JP S642424A JP 15822987 A JP15822987 A JP 15822987A JP 15822987 A JP15822987 A JP 15822987A JP S642424 A JPS642424 A JP S642424A
Authority
JP
Japan
Prior art keywords
path
acoustic
line
echo canceler
cancelers
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
JP15822987A
Other languages
Japanese (ja)
Other versions
JPH012424A (en
Inventor
Hiromoto Furukawa
Satoru Ibaraki
Hiroyuki Naono
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 JP15822987A priority Critical patent/JPS642424A/en
Publication of JPH012424A publication Critical patent/JPH012424A/en
Publication of JPS642424A publication Critical patent/JPS642424A/en
Pending legal-status Critical Current

Links

Landscapes

  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE: To prevent a speaker phone from howling by inhibiting an acoustic echo canceler and a line echo canceler from estimating characteristics of an acoustic path and a line path with a narrow-band signal such as a calling signal.
CONSTITUTION: Input signals to the reception input control acoustic echo canceler 5 and reception input control line echo canceler 6 are made white to minitor the input levels and when they are smaller than a threshold value, the estimation of an echo path is stopped so that the cancelers 5 and 6 do not estimate the characteristics of the acoustic path and line path with the narrow-band signal. The outputs of the cancelers 5 and 6 are made white reversely. Thus, an adaptive sound switch 7 does not decrease in insertion loss more than required with the narrow-band signal and the cancelers 5 and 6 are so controlled as to estimate the characteristics of the acoustic path and line path with the white component of a sound signal, thereby precluding howling.
COPYRIGHT: (C)1989,JPO&Japio
JP15822987A 1987-06-25 1987-06-25 Howling suppression device Pending JPS642424A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15822987A JPS642424A (en) 1987-06-25 1987-06-25 Howling suppression device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15822987A JPS642424A (en) 1987-06-25 1987-06-25 Howling suppression device

Publications (2)

Publication Number Publication Date
JPH012424A JPH012424A (en) 1989-01-06
JPS642424A true JPS642424A (en) 1989-01-06

Family

ID=15667100

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15822987A Pending JPS642424A (en) 1987-06-25 1987-06-25 Howling suppression device

Country Status (1)

Country Link
JP (1) JPS642424A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999014868A1 (en) * 1997-09-16 1999-03-25 Sanyo Electric Co., Ltd. Echo elimination method, echo canceler and voice switch

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999014868A1 (en) * 1997-09-16 1999-03-25 Sanyo Electric Co., Ltd. Echo elimination method, echo canceler and voice switch
US6868157B1 (en) 1997-09-16 2005-03-15 Sanyo Electric Co., Ltd. Echo canceling method, echo canceller and voice switch

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