JPS6458200A - Electronic silence system - Google Patents

Electronic silence system

Info

Publication number
JPS6458200A
JPS6458200A JP62214841A JP21484187A JPS6458200A JP S6458200 A JPS6458200 A JP S6458200A JP 62214841 A JP62214841 A JP 62214841A JP 21484187 A JP21484187 A JP 21484187A JP S6458200 A JPS6458200 A JP S6458200A
Authority
JP
Japan
Prior art keywords
ram
coefficient
convolution
interrupting
storage device
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
JP62214841A
Other languages
Japanese (ja)
Other versions
JPH0727389B2 (en
Inventor
Minoru Takahashi
Taku Kuribayashi
Yoshitaka Oguri
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.)
Hitachi Plant Technologies Ltd
Original Assignee
Hitachi Plant Technologies 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 Hitachi Plant Technologies Ltd filed Critical Hitachi Plant Technologies Ltd
Priority to JP62214841A priority Critical patent/JPH0727389B2/en
Publication of JPS6458200A publication Critical patent/JPS6458200A/en
Publication of JPH0727389B2 publication Critical patent/JPH0727389B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

PURPOSE:To eliminate cause to discontinity and noninstantaneousity by providing a storage device for storing two coefficients and a storage device for two input signals to correct a control parameter without interrupting the operation even during the system operation to a control means correcting the control parameter. CONSTITUTION:Sensor microphones M1, M1' clipping an additional sound source S inbetween are arranged in a propagation path 1 at a position where transfer functions Hr, Ht are equivalent to each other. In detecting a propagated sound wave generated from a noise source in the propagation path 1 by the M1, M1', the wave is inputted to an adder circuit 20, and its output signal is fed respectively to a digital filter 29 and a control section 30 via an A/D converter 24. The digital filter 29 has two RAMs for storing coefficients, transfers a new coefficient to the RAM 2 when the RAM 1 is used for convolution and switches the RAM 1 and RAM 2 when the transfer of the coefficient is finished. Thus, the coefficient is revised without interrupting the convolution.
JP62214841A 1987-08-28 1987-08-28 Electronic silencing system Expired - Lifetime JPH0727389B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62214841A JPH0727389B2 (en) 1987-08-28 1987-08-28 Electronic silencing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62214841A JPH0727389B2 (en) 1987-08-28 1987-08-28 Electronic silencing system

Publications (2)

Publication Number Publication Date
JPS6458200A true JPS6458200A (en) 1989-03-06
JPH0727389B2 JPH0727389B2 (en) 1995-03-29

Family

ID=16662428

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62214841A Expired - Lifetime JPH0727389B2 (en) 1987-08-28 1987-08-28 Electronic silencing system

Country Status (1)

Country Link
JP (1) JPH0727389B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0336897A (en) * 1989-07-03 1991-02-18 Hitachi Plant Eng & Constr Co Ltd Electronic silencing system
JPH0342999A (en) * 1989-07-10 1991-02-25 Hitachi Plant Eng & Constr Co Ltd Silencing device for radiation noise in opening section
JPH03195296A (en) * 1989-12-25 1991-08-26 Matsushita Electric Ind Co Ltd Noise canceller
JPH0470200A (en) * 1990-07-10 1992-03-05 Hitachi Plant Eng & Constr Co Ltd Electronic silencing system
WO1992022054A1 (en) * 1991-05-30 1992-12-10 Fujitsu Ten Limited Noise control apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59133595A (en) * 1982-11-26 1984-07-31 ロ−ド・コ−ポレ−シヨン Active sound attenuator
JPS62164400A (en) * 1986-01-14 1987-07-21 Hitachi Plant Eng & Constr Co Ltd Electronic silencer system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59133595A (en) * 1982-11-26 1984-07-31 ロ−ド・コ−ポレ−シヨン Active sound attenuator
JPS62164400A (en) * 1986-01-14 1987-07-21 Hitachi Plant Eng & Constr Co Ltd Electronic silencer system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0336897A (en) * 1989-07-03 1991-02-18 Hitachi Plant Eng & Constr Co Ltd Electronic silencing system
JPH0342999A (en) * 1989-07-10 1991-02-25 Hitachi Plant Eng & Constr Co Ltd Silencing device for radiation noise in opening section
JPH03195296A (en) * 1989-12-25 1991-08-26 Matsushita Electric Ind Co Ltd Noise canceller
JPH0470200A (en) * 1990-07-10 1992-03-05 Hitachi Plant Eng & Constr Co Ltd Electronic silencing system
WO1992022054A1 (en) * 1991-05-30 1992-12-10 Fujitsu Ten Limited Noise control apparatus

Also Published As

Publication number Publication date
JPH0727389B2 (en) 1995-03-29

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