KR20040046505A - Noise recording apparatus of mobile phone - Google Patents
Noise recording apparatus of mobile phone Download PDFInfo
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- KR20040046505A KR20040046505A KR1020020074449A KR20020074449A KR20040046505A KR 20040046505 A KR20040046505 A KR 20040046505A KR 1020020074449 A KR1020020074449 A KR 1020020074449A KR 20020074449 A KR20020074449 A KR 20020074449A KR 20040046505 A KR20040046505 A KR 20040046505A
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- voice signal
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- microphone
- mobile phone
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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Abstract
Description
본 발명은 휴대폰에서 마이크를 통해 입력되는 음성신호에 포함된 잡음 성분을 제거하는 기술에 관한 것으로, 특히 마이크를 통해 입력되는 음성신호를 필터링할 때 사용자 목소리의 주파수를 기준으로 필터링하여 잡음 제거 성능을 향상시킬 수 있도록 한 휴대폰의 소음 제거 장치에 관한 것이다.The present invention relates to a technology for removing noise components included in a voice signal input through a microphone in a mobile phone, and in particular, when filtering a voice signal input through a microphone, filtering noise based on a frequency of a user voice. It relates to the noise canceling device of a mobile phone so that it can be improved.
휴대폰의 경우 일반 전화기와 달리 실내 뿐만 아니라 실외의 어느 곳에서도 통화가 가능하므로 휴대폰의 마이크를 통해 입력되는 음성신호에는 실로 다양한 종류의 음성신호들이 포함될 수 있다. 따라서, 통화 품질을 향상시키기 위해서는 상기 마이크를 통해 입력되는 사용자의 음성신호를 제외한 잡음성분들을 적절하게 제거할 필요가 있다.In the case of a mobile phone, unlike a normal phone, a call can be made anywhere in the outdoors as well as indoors. Therefore, various kinds of voice signals may be included in the voice signal input through the microphone of the mobile phone. Therefore, in order to improve call quality, it is necessary to appropriately remove noise components except for a user's voice signal input through the microphone.
그런데, 종래의 휴대폰에 있어서는 마이크를 통해 입력되는 음성신호에 포함된 잡음 성분을 필터링할 때, 여러 사람들의 일반적인 목소리 주파수를 기준 주파수로 설정하여 음성신호를 필터링하였다. 따라서, 필터링된 음성신호에는 사용자의 음성신호 뿐만 아니라 주변 사람들의 음성신호가 포함될 수 있다.However, in the conventional mobile phone, when filtering a noise component included in a voice signal input through a microphone, the voice signal is filtered by setting a general voice frequency of various people as a reference frequency. Therefore, the filtered voice signal may include not only the voice signal of the user but also the voice signals of the people around.
이와 같이 종래 기술에 의한 휴대폰의 소음 제거 장치에 있어서는 마이크를 통해 입력되는 음성신호에 포함된 잡음 성분을 필터링할 때, 여러 사람들의 음성 주파수를 기준 주파수로 설정하여 필터링하게 되므로, 사용자 이외의 주변 사람들의 음성신호가 상대방에게 전송되어 결과적으로 통화 품질이 저하되는 문제점이 있었다.As described above, in the conventional noise reduction device of a mobile phone, when filtering noise components included in a voice signal input through a microphone, various people's voice frequencies are set to a reference frequency and thus filtered. There was a problem that the voice signal is transmitted to the other party, and as a result, the call quality deteriorates.
따라서, 본 발명의 목적은 휴대폰 마이크를 통해 입력되는 음성신호를 필터링할 때 여러 사람들의 음성 주파수를 기준으로 필터링하는 것이 아니라 사용자 목소리의 주파수 영역을 기준으로 필터링하는 휴대폰의 소음 제거 장치를 제공함에 있다.Accordingly, an object of the present invention is to provide a noise reduction device of a mobile phone for filtering the voice signal input through the mobile phone microphone, based on the frequency range of the user's voice, rather than filtering the voice frequency of several people. .
도 1은 본 발명에 의한 휴대폰의 마이크신호 필터링 장치의 블록도.1 is a block diagram of a microphone signal filtering device of a mobile phone according to the present invention.
***도면의 주요 부분에 대한 부호의 설명****** Description of the symbols for the main parts of the drawings ***
1 : 마이크2 : 메모리1: microphone 2: memory
3 : 필터4 : 증폭기3: filter 4: amplifier
5 : 무선주파수 변환부5: radio frequency converter
도 1은 본 발명에 의한 휴대폰의 소음 제거 장치의 일실시 구현예를 나타낸 블록도로서 이에 도시한 바와 같이, 음성신호를 전기적인 신호를 변환하는 마이크(1)와; 상기 마이크(1)를 통해 입력되는 사용자 음성신호의 주파수를 저장하기 위한 메모리(2)와; 상기 마이크(1)를 통해 입력되는 음성신호를 필터링할 때 상기 메모리(2)에 저장되어 있는 음성신호의 주파수 영역을 차단주파수 영역으로 설정하여 필터링하는 필터(3)와; 상기 필터(3)에서 출력되는 음성신호를 일정 레벨로 증폭하는 증폭기(4)와; 상기 증폭 처리된 기저대역의 음성신호를 공중으로 전송하는데 적당한 형태의 무선주파수(RF: Radio Frequency)로 변환하는 무선주파수 변환부(5)로 구성한 것으로, 이와 같이 구성한 본 발명의 작용을 상세히 설명하면 다음과 같다.1 is a block diagram showing an embodiment of a noise canceling device of a mobile phone according to the present invention, as shown here, a microphone 1 for converting a voice signal into an electrical signal; A memory (2) for storing a frequency of a user voice signal input through the microphone (1); A filter (3) for filtering the voice signal input through the microphone (1) by setting a frequency domain of the voice signal stored in the memory (2) to a cutoff frequency domain; An amplifier 4 for amplifying the audio signal output from the filter 3 to a predetermined level; The radio frequency converter 5 converts the amplified baseband voice signal into a radio frequency (RF) of a form suitable for transmitting to the air. The operation of the present invention configured as described above will be described in detail. As follows.
마이크(1)를 통해 입력되는 사용자의 음성신호가 시스템의 제어부(예: 마이크로컴퓨터)에 의해 메모리(2)에 저장되는데, 이와 같이 하는 이유는 필터(3)의 필터링 주파수 영역을 사용자 고유의 음성 주파수 영역으로 설정하기 위함이다.The voice signal of the user input through the microphone 1 is stored in the memory 2 by the control unit (e.g., microcomputer) of the system. The reason for this is that the filtering frequency range of the filter 3 is defined by the user's own voice. To set the frequency range.
이후, 상기 마이크(1)를 통해 입력되는 음성신호를 필터(3)에서 필터링할 때 상기 메모리(2)에 저장되어 있는 사용자 음성신호의 주파수 영역을 기준(컷오프 주파수)으로 필터링하게 된다.Subsequently, when the voice signal input through the microphone 1 is filtered by the filter 3, the frequency domain of the user voice signal stored in the memory 2 is filtered based on a cutoff frequency.
결국, 전화 특히, 휴대폰의 경우 사용자의 음성신호의 주파수 영역 밖에 존재하는 음성신호는 별다른 의미가 없는 신호들이므로 이들을 잡음신호 성분으로 간주하여 필터링 함으로써, 통화 품질을 향상시킬 수 있게 된다.After all, in the case of a telephone, in particular, a mobile phone, voice signals existing outside the frequency range of the user's voice signal are signals having no meaning, so that the call quality can be improved by filtering them as noise signal components.
이와 같은 처리과정을 통해 필터링된 사용자의 음성신호를 증폭기(4)를 통해 외부로 출력하는데 적당한 수준으로 증폭한다. 또한, 무선주파수 변환부(5)를 통해서는 상기 증폭 처리된 기저대역의 음성신호를 공중으로 전송하는데 적당한 형태의 무선주파수로 변환하여 출력한다.Through this process, the filtered user's voice signal is amplified to an appropriate level to be output to the outside through the amplifier (4). In addition, the radio frequency converter 5 converts the amplified baseband audio signal into a radio frequency of a form suitable for transmission to the air and outputs the converted radio frequency.
이상에서 상세히 설명한 바와 같이 본 발명은 휴대폰의 마이크를 통해 입력되는 음성신호를 필터링할 때 여러 사람들의 음성 주파수를 기준으로 필터링하는 것이 아니라 사용자 목소리의 주파수 영역을 기준으로 필터링 함으로써, 발신자의 음성신호 이외의 음성신호가 모두 차단되어 통화 품질이 향상되는 효과가 있다.As described in detail above, the present invention filters the voice signal input through the microphone of the mobile phone, not by the voice frequency of several people, but by filtering the voice signal based on the frequency range of the user voice. All voice signals are blocked to improve the call quality.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100585778B1 (en) * | 2004-10-13 | 2006-06-07 | 엘지전자 주식회사 | Method for removing surrounding noise in call of mobile communication terminal |
KR100662427B1 (en) * | 2005-01-28 | 2007-01-02 | 삼성전자주식회사 | Mobile terminal providing improved sound |
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WO2010151048A2 (en) * | 2009-06-23 | 2010-12-29 | 주식회사 더바인코퍼레이션 | Intelligibility-enhancing apparatus and voice output apparatus using same |
KR101068227B1 (en) | 2009-06-23 | 2011-09-28 | 주식회사 더바인코퍼레이션 | Clarity Improvement Device and Voice Output Device Using the Same |
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KR100294920B1 (en) * | 1998-09-09 | 2001-07-12 | 윤종용 | The method and apparatus of speech detection for speech recognition of cellular communication system in advers noisy environment |
KR20020052604A (en) * | 2000-12-26 | 2002-07-04 | 구자홍 | Control circuit for transmission voice in a mobile terminal |
KR20030015928A (en) * | 2001-08-18 | 2003-02-26 | 엘지전자 주식회사 | Method for removing a noise at a sender side in mobile phone |
KR20040033538A (en) * | 2002-10-15 | 2004-04-28 | 주식회사 팬택 | Mobile telecommunication terminal made used of adaptive filtering algorithm and its noise control method |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100585778B1 (en) * | 2004-10-13 | 2006-06-07 | 엘지전자 주식회사 | Method for removing surrounding noise in call of mobile communication terminal |
KR100662427B1 (en) * | 2005-01-28 | 2007-01-02 | 삼성전자주식회사 | Mobile terminal providing improved sound |
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