KR960043970A - Howling noise prevention device and method - Google Patents

Howling noise prevention device and method Download PDF

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Publication number
KR960043970A
KR960043970A KR1019950011043A KR19950011043A KR960043970A KR 960043970 A KR960043970 A KR 960043970A KR 1019950011043 A KR1019950011043 A KR 1019950011043A KR 19950011043 A KR19950011043 A KR 19950011043A KR 960043970 A KR960043970 A KR 960043970A
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South Korea
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signal
output
howling
howling noise
noise
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KR1019950011043A
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Korean (ko)
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KR0144184B1 (en
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손창수
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구자홍
Lg 전자 주식회사
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Priority to KR1019950011043A priority Critical patent/KR0144184B1/en
Publication of KR960043970A publication Critical patent/KR960043970A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L2021/02082—Noise filtering the noise being echo, reverberation of the speech

Abstract

본 발명은 하울링 잡음 검출결과에 따라 하울링 잡음 제거신호나 원음을 선택적으로 출력하도록 한 하울링 잡음 방지장치 및 방법에 관한 것으로, 본 발명은 종래의 경우 하울링이 없는 원음의 경우에도 하울링 제거과정을 거치게 되어 원음이 손상을 입게 되던 점을 감안하여 마이크의 출력신호인 전기신호를 증폭시키는 증폭부, 상기 증폭된 전기신호의 하울링 잡음을 검찰하는 하울링 잡음 검출부, 상기 증폭된 전기 신호의 하울링 잡음을 제거하는 하울링 잡음 제거부, 상기 하울링 잡음 제거부의 출력과 상기 증폭된 전기신호를 입력으로 하여 절환 출력하는 스위칭부, 상기 하울링 잡음 검출부의 출력에 따라 상기 스위칭부의 절환을 제어하는 제어부를 구비하여 외부음성신호를 전기적신호로 변환하고 증폭하여 증폭된 전기신호로 변환하는 제1단계, 상기 제1단계의 출력을 입력으로 하여 아울링 잡음을 검출하는 제2단계, 상기 제1단계의 출력을 입력으로 하여 하울링 잡음을 제거하는 제3단계, 상기 제2단계의 출력에 따라 제1단계의 출력과 제3단계의 출력을 절환하여 출력하는 제4단계를 수행함으로써 하울링 잡음 검출결과에 따라 하울링이 없는 원음과 원음에서 하울링 신호가 제거된 신호를 선택적으로 출력함으로써 원음이 하울링 제거과정을 거치는 것을 방지하여 원음의 손상을 방지할 수 있도록 한 것이다.The present invention relates to a howling noise preventing device and method for selectively outputting a howling noise removing signal or original sound according to a howling noise detection result, and the present invention undergoes a howling removal process even in the case of the original sound without a howling in the related art. In consideration of the fact that the original sound is damaged, an amplifier for amplifying an electric signal which is an output signal of a microphone, a howling noise detector for inspecting a howling noise of the amplified electric signal, and a howling for removing the howling noise of the amplified electric signal. A noise canceling unit, a switching unit for switching and outputting the output of the howling noise removing unit and the amplified electric signal, and a control unit for controlling the switching of the switching unit according to the output of the howling noise detector. The first stage of converting and amplifying an electrical signal into an amplified electrical signal And a second step of detecting howling noise by using the output of the first step, a third step of removing howling noise by using the output of the first step as an input, and according to the output of the second step. The fourth step of switching between the output of the first stage and the output of the third stage is performed to selectively output the original sound without the howling and the signal from which the howling signal is removed from the original sound according to the howling noise detection result. It is to prevent the damage to the original sound by going through.

Description

하울링 잡음 방지장치 및 방법Howling noise prevention device and method

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제1도는 본 발명에 따른 하울링 잡음 방지장치의 블럭 구성도.1 is a block diagram of a howling noise preventing device according to the present invention.

Claims (7)

외부음성신호를 전기적신호로 변환하는 마이크와, 상기 마이크의 출력신호인 전기신호를 증폭시키는 증폭부와, 상기 증폭된 전기신호의 하울링 잡음을 검출하는 하울링 잡음 검출부와, 상기 증폭된 전기신호의 하울링 잡음을 제거하는 하울링 잡음 제거부와, 상기 하울링 잡음 제거부의 출력과 상기 증폭된 전기신호를 입력으로 하여 절환출력하는 스위칭부와, 상기 하울링 잡음 검출부의 출력에 따라 상기 스위칭부의 절환을 제어하는 제어부와, 상기 스위칭부의 출력을 입력으로 하여 음성신호처리하는 음성신호처리부를 구비함을 특징으로 하는 하울링 잡음 방지장치.A microphone for converting an external voice signal into an electrical signal, an amplifier for amplifying an electric signal which is an output signal of the microphone, a howling noise detector for detecting howling noise of the amplified electric signal, and a howling of the amplified electric signal A howling noise removing unit for removing noise, a switching unit for switching and outputting the output of the howling noise removing unit and the amplified electric signal, and a control unit controlling switching of the switching unit according to the output of the howling noise detector. And a voice signal processing unit configured to process a voice signal by using the output of the switching unit as an input. 제1항에 있어서, 상기 하울링 잡음 검출부는 상기 증폭된 전기신호의 게인을 검출하여 기준신호의 게인과 비교하는 게인 검출부와, 상기 증폭된 전기신호의 주파수 대역을 검출하여 기준신호의 주파수 대역과 비교하는 주파수 대역 검출부와, 상기 증폭된 전기신호의 특정주파수를 검출하는 주파수 검출부로 구성됨을 특징으로 하는 하울링 잡음 방지장치.The method of claim 1, wherein the howling noise detector detects a gain of the amplified electric signal and compares it with a gain of a reference signal, and detects and compares a frequency band of the amplified electric signal with a frequency band of a reference signal. Howling noise prevention device characterized in that it comprises a frequency band detector for detecting a specific frequency of the amplified electrical signal. 제1항에 있어서, 상기 하울링 잡음 검출부는 상기 증폭된 전기신호의 게인을 검출하여 기준신호의 게인과 비교하는 게인 검출부 또는 상기 증폭된 전기신호의 주파수 대역을 검출하여 기준신호의 주파수 대역과 비교하는 주파수 대역 검출부 또는 상기 증폭된 전기신호의 특정주파수를 검출하는 주파수 검출부로 구성됨을 특징으로 하는 하울링 잡음 방지장치.The method of claim 1, wherein the howling noise detector detects a gain of the amplified electric signal and compares it with a gain of a reference signal or detects a frequency band of the amplified electric signal and compares it with a frequency band of the reference signal. Howling noise prevention device characterized in that it comprises a frequency band detector or a frequency detector for detecting a specific frequency of the amplified electrical signal. 제1항에 있어서, 상기 하울링 잡음 제거부는 밴드패스필터로 구성됨을 특징으로 하는 하울링 잡음 방지장치.The howling noise preventing device of claim 1, wherein the howling noise removing unit comprises a band pass filter. 외부음성신호를 전기적신호로 변환하고 증폭하여 증폭된 전기신호로 변환하는 제1단계, 상기 제1단계의 출력을 입력으로 하여 하울링 잡음을 검출하는 제2단계와, 상기 제1단계의 출력을 입력으로 하여 하울링 잡음을 제거하는 제3단계, 상기 제2단계의 출력에 따라 제1단계의 출력과 제3단계의 출력을 절환하여 출력하는 제4단계와, 상기 제4단계의 출력을 입력으로 하여 음성신호처리하는 제5단계로 이루어짐을 특징으로 하는 하울링 잡음 방지방법.A first step of converting an external voice signal into an electrical signal, amplifying and converting the amplified electric signal into an amplified electric signal, a second step of detecting howling noise by using the output of the first step, and an output of the first step A third step of removing the howling noise, a fourth step of switching the output of the first step and an output of the third step according to the output of the second step, and an output of the fourth step as inputs Howling noise prevention method characterized in that the fifth step of processing the voice signal. 제5항에 있어서, 상기 하울링 잡음을 검출하는 제2단계는 상기 제1단계의 출력신호의 게인을 검출하여 기준신호의 게인과 비교하는 단계와, 상기 제1단계의 출력신호의 주파수 대역을 검출하여 기준신호의 주파수 대역과 비교하는 단계와, 상기 제1단계의 출력신호의 특정주파수를 검출하는 단계로 이루어짐을 특징으로 하는 하울링 잡음 방지방법.6. The method of claim 5, wherein the detecting of the howling noise comprises: detecting a gain of the output signal of the first step and comparing the gain with a reference signal; and detecting a frequency band of the output signal of the first step. Comparing the frequency band of the reference signal with a signal; and detecting a specific frequency of the output signal of the first step. 제5항에 있어서, 상기 하울링 잡음을 검출하는 제2단계는 상기 제1단계의 출력신호의 게인을 검출하여 기준신호와 게인과 비교하는 단계 또는 상기 제1단계의 출력신호의 주파수 대역을 검출하여 기준신호의 주파수 대역과 비교하는 단계 또는 상기 제1단계의 출력신호의 특정주파수를 검출하는 단계로 이루어짐을 특징으로 하는 하울링 잡음 방지방법.The method of claim 5, wherein the second step of detecting the howling noise comprises: detecting a gain of the output signal of the first step, comparing the gain with a reference signal and a gain, or detecting a frequency band of the output signal of the first step; How to prevent the howling noise comprising the step of comparing the frequency band of the reference signal or detecting a specific frequency of the output signal of the first step. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950011043A 1995-05-04 1995-05-04 Apparatus and method for preventing hawling KR0144184B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101303584B1 (en) * 2012-12-31 2013-09-11 (주)이어존 Auto howling control system and methode for mic system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101478177B1 (en) * 2014-05-21 2015-01-02 주식회사 에스엔디테크 Method for rejecting howling occurred at anticrime cctv place and the system by using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101303584B1 (en) * 2012-12-31 2013-09-11 (주)이어존 Auto howling control system and methode for mic system

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