KR100255935B1 - Apparatus of a sound filtering for a communication terminal equipment - Google Patents

Apparatus of a sound filtering for a communication terminal equipment Download PDF

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KR100255935B1
KR100255935B1 KR1019970040802A KR19970040802A KR100255935B1 KR 100255935 B1 KR100255935 B1 KR 100255935B1 KR 1019970040802 A KR1019970040802 A KR 1019970040802A KR 19970040802 A KR19970040802 A KR 19970040802A KR 100255935 B1 KR100255935 B1 KR 100255935B1
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signal
voice
noise
output
adaptive
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KR1019970040802A
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Korean (ko)
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KR19990017777A (en
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강성우
안이승
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윤종용
삼성전자주식회사
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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers

Abstract

PURPOSE: A voice filtering apparatus of a communicating terminal is to selectively eliminate only a noise signal mixed in a voice signal when transmitting/receiving the voice signal in the communicating terminal, thereby improving quality of the voice signal. CONSTITUTION: A voice signal containing a noise signal is input to an input portion(10). An adaptive filtering portion(20) filters the noise signal from the voice signal. An output portion(30) outputs a voice estimating signal of the adaptive filtering portion. In the adaptive filtering portion, A time delaying circuit(21) delays the voice signal for a desired time to separate the voices signal and the noise signal. An adaptive signal processing circuit(22) performs an LMS(least-mean-square) process of the voices signal and the noise signal output from the time delaying circuit to output the voice estimating signal. An adder(23) adds the voice signal containing the noise signal and the voice estimating signal and then transmits to the adaptive signal processing circuit. The input portion receives the voice signal through a microphone(11). The output portion outputs the voice estimating signal through an antenna.

Description

통신단말기의 음성필터링장치Voice filtering device of communication terminal

본 발명은 음성필터링장치에 관한 것으로서, 보다 상세하게는 무선통신을 이용한 통신단말기의 송수신시, 음성신호에 혼합된 잡음신호만을 선택적으로 제거하여 고품질의 음성신호를 송수신할 수 있도록 한 통신단말기의 음성필터링장치에 관한 것이다.The present invention relates to a voice filtering device, and more particularly, when transmitting and receiving a communication terminal using wireless communication, a voice of a communication terminal capable of transmitting and receiving a high quality voice signal by selectively removing only a noise signal mixed with a voice signal. It relates to a filtering device.

최근 개인 휴대통신 기술의 발달로 아날로그 및 디지털방식의 셀룰러 폰(Cellular phone), 발신전용휴대전화(CT-2), 및 간이휴대전화(PCS)등의 다양한 통신단말기가 개발되어 널리 사용되고 있으며, 특히 이와 같은 통신단말기들은 휴대 및 이동의 편리성을 최대한 부각시키기 위하여, 그 기기 자체가 더욱 경량화, 소형화되는 추세이다.Recently, due to the development of personal mobile communication technology, various communication terminals such as analog and digital cellular phones, call-only mobile phones (CT-2), and simple mobile phones (PCS) have been developed and widely used. Such communication terminals tend to be lighter and smaller in size in order to maximize the convenience of portable and mobile.

아울러, 이러한 통신단말기의 소형화 추세에 따라 음성신호를 입력하는 마이크로폰(11)과 통화자의 입 사이의 거리가 더욱 이격됨으로, 이 음성신호에 주위의 소음등에 의한 보다 많은 잡음신호가 혼입되어 통화품질을 저하시키는 요인이 되고 있다.In addition, according to the trend of miniaturization of the communication terminal, the distance between the microphone 11 for inputting the voice signal and the mouth of the caller is further separated, so that more noise signals due to ambient noise are mixed in the voice signal, thereby improving the call quality. It is a factor to decrease.

이와 같은 종래의 통신단말기는 일반적인 필터를 적용하여 전술한 바와 같은 음성신호에 혼입된 잡음신호를 제거하였으나, 이는 소정 주파수대역의 신호를 일괄적으로 감쇄시켜 상대적으로 그 레벨이 낮은 잡음신호를 제거하도록 하는 것이다.Such a conventional communication terminal removes a noise signal mixed in a voice signal as described above by applying a general filter, but it attenuates a signal of a predetermined frequency band collectively to remove a noise signal having a relatively low level. It is.

따라서, 전술한 음성신호와 이에 혼입된 잡음신호는 동일 주파수대역에 존재함으로 잡음신호의 감쇄와 함께 음성신호의 레벨도 감쇄되었다.Therefore, since the above-described voice signal and the noise signal mixed therein exist in the same frequency band, the level of the voice signal is also attenuated with the attenuation of the noise signal.

따라서, 종래의 필터를 적용한 통신단말기는 송수신신호 중, 잡음신호를 제거하되, 음성신호와 같은 주파수대역의 잡음신호만을 선택적으로 제거할 수 없음으로 결국 통화품질을 저하시키는 문제점이 있었다.Therefore, the communication terminal applying the conventional filter removes the noise signal from the transmission and reception signals, but only a noise signal in the same frequency band as the voice signal cannot be selectively removed, resulting in a problem of degrading the call quality.

또한, 종래 통신단말기의 필터를 통해 잡음신호와 함께 감쇄된 음성신호를 인식 가능한 소정레벨로 증폭시키기 위하여 각종 증폭회로가 부가되는 다른 문제점도 있다.In addition, there is another problem that various amplification circuits are added to amplify a voice signal attenuated with a noise signal through a filter of a conventional communication terminal to a predetermined level.

따라서, 이와 같은 문제점을 해결하기 위한 본 발명의 목적은, 통신단말기의 송수신시, 음성신호에 혼합된 잡음신호만을 선택적으로 제거하여 고품질의 음성신호를 송수신할 수 있도록 한 통신단말기의 음성필터링장치를 제공함에 있다.Accordingly, an object of the present invention to solve this problem is to provide a voice filtering device of a communication terminal capable of transmitting and receiving a high quality voice signal by selectively removing only a noise signal mixed with a voice signal when transmitting and receiving a communication terminal. In providing.

도 1은 본 발명에 따른 통신단말기의 음성필터링장치의 바람직한 실시예를 나타낸 블록구성도,1 is a block diagram showing a preferred embodiment of a voice filtering device of a communication terminal according to the present invention;

도 2는 본 발명에 따른 통신단말기의 음설필터링 장치의 제 2 실시예를 나타낸 블록구성도,Figure 2 is a block diagram showing a second embodiment of the speech filter device of the communication terminal according to the present invention,

도 3은 시간 지연에 따른 음성신호 및 잡음신호의 자기상관함수를 나타낸 도면이다.3 is a diagram illustrating an autocorrelation function of a voice signal and a noise signal according to a time delay.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : 입력부 11 : 마이크로폰10: input unit 11: microphone

12 : 수신부 20 : 적응필터부12: receiver 20: adaptive filter

21 : 시간지연회로 22 : 적응신호처리회로21: time delay circuit 22: adaptive signal processing circuit

23 : 가산기 30 : 출력부23: adder 30: output unit

31 : 송신부 32 : 스피커31: transmitter 32: speaker

ANT : 안테나ANT: Antenna

이와 같은 목적을 달성하기 위한 본 발명에 따른 통신단말기의 음성필터링장치의 특징은, 잡음신호가 혼입된 음성신호를 입력하는 입력부와; 상기 입력부에서 출력된 잡음신호가 혼입된 음성신호를 소정시간동안 지연시켜 음성신호와 잡음신호를 분리하는 시간지연회로와, 상기 시간지연회로를 거친 음성신호와 잡음신호를 LMS(Least-Mean-Square)신호처리 알고리즘을 적용함으로 음성추정신호를 출력하는 적응신호처리회로와, 잡음신호가 혼입된 음성신호와 음성추정신호를 가산하여 출력된 잡음추정신호를 상기 적응신호처리회로에 인가하는 가산기로 구성된 적응필터부; 및 상기 적응필터부의 음성추정신호를 출력하는 출력부를 포함한다.A feature of the voice filtering device of the communication terminal according to the present invention for achieving the above object is an input unit for inputting a voice signal mixed with a noise signal; A time delay circuit for separating the voice signal and the noise signal by delaying the voice signal mixed with the noise signal output from the input unit for a predetermined time and a LMS (Least-Mean-Square) An adaptive signal processing circuit for outputting a speech estimation signal by applying a signal processing algorithm, and an adder for applying the noise estimation signal mixed with the noise signal and the speech estimation signal to the adaptive signal processing circuit. Adaptive filter unit; And an output unit for outputting a voice estimation signal of the adaptive filter unit.

또한, 상기 입력부는 마이크로폰을 통하여 잡음신호가 혼입된 음성신호를 입력하며, 상기 출력부는 송신부의 안테나(ANT)를 통하여 음성추정신호를 공중파로 출력하도록 함을 특징으로 한다.The input unit may input a voice signal into which a noise signal is mixed through a microphone, and the output unit may output the voice estimation signal as airwaves through an antenna ANT of the transmitter unit.

또는, 상기 입력부는 수신부의 안테나(ANT)를 통하여 잡음신호가 혼입된 음성신호를 입력하며, 상기 출력부는 스피커를 통하여 음성추정신호를 출력하도록 함을 특징으로 한다.Alternatively, the input unit may input a voice signal mixed with a noise signal through an antenna ANT of the receiver, and the output unit may output a voice estimation signal through a speaker.

그리고, 상기 가산기에서 출력되어 상기 적응신호처리회로에 입력되는 잡음추정신호는 필터의 오차신호로써 상기 LMS(Least-Mean-Square)신호처리 알고리즘에 적용됨에 따라 잡음이 혼입된 음성신호에서 잡음신호를 제거하는 필터링시에 발생되는 오차를 최소화함을 특징으로 한다.The noise estimation signal output from the adder and input to the adaptive signal processing circuit is an error signal of a filter and is applied to the Least-Mean-Square (LMS) signal processing algorithm. It is characterized by minimizing the error generated during filtering to remove.

그러므로, 상술한 바와 같이 본 발명에 따른 통신단말기의 음성필터링장치는 통신단말기의 송수신시, 음성신호에 혼합된 잡음신호만을 선택적으로 제거함으로써 고품질의 음성신호를 송수신할 수 있고, 또한 적응처리신호회로에 가산기로부터 입력되는 잡음추정신호를 음성신호와 잡음신호의 오차신호로써 LMS신호처리 알고리즘을 적용함으로 미세한 잡음까지 제거할 수 있다.Therefore, as described above, the voice filtering device of the communication terminal according to the present invention can transmit and receive high-quality voice signals by selectively removing only the noise signal mixed with the voice signal when transmitting and receiving the communication terminal, and further, the adaptive processing signal circuit. By applying the LMS signal processing algorithm to the noise estimation signal input from the adder as the error signal between the voice signal and the noise signal, the fine noise can be removed.

또한, 적응필터부를 통하여 음성신호에 혼입된 잡음신호만을 제거함으로, 종래 통신단말기의 필터를 통해 잡음신호와 함께 감쇄된 음성신호를 인식 가능한 소정레벨로 증폭시키기 위하여 부가되는 각종 증폭회로를 삭제할 수 있는 다른 효과가 있다.Also, by removing only the noise signal mixed into the voice signal through the adaptive filter unit, various amplification circuits added to amplify the voice signal attenuated with the noise signal through the filter of the conventional communication terminal to a predetermined level can be deleted. It has a different effect.

이하, 본 발명에 따른 통신단말기의 음성필터링장치의 바람직한 실시예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings a preferred embodiment of the voice filtering device of the communication terminal according to the present invention will be described in detail.

도 1은 본 발명에 따른 통신단말기의 음성필터링장치의 바람직한 실시예를 나타낸 블록구성도이고, 도 2는 본 발명에 따른 통신단말기의 음성필터링장치의 제 2 실시예를 나타낸 블록구성도이다.1 is a block diagram showing a preferred embodiment of the voice filtering device of the communication terminal according to the present invention, Figure 2 is a block diagram showing a second embodiment of the voice filtering device of the communication terminal according to the present invention.

도시된 바와 같이 입력부(10)는 잡음신호가 혼입된 음성신호를 입력하고, 적응필터부(20)는 상기 입력부(10)의 음성신호를 필터링하여 잡음신호만을 선택적으로 제거하고 음성추정신호를 출력하며, 출력부(30)는 상기 적응필터부(20)의 음성추정신호를 출력하도록 구성하되, 상기 입력부(10)는 마이크로폰(11)을 통하여 잡음신호가 혼입된 음성신호를 입력하며, 상기 출력부(30)는 송신부(31)의 안테나(ANT)를 통하여 음성추정신호를 공중파로 출력하도록 구성한다.As shown, the input unit 10 inputs a voice signal mixed with a noise signal, and the adaptive filter unit 20 filters the voice signal of the input unit 10 to selectively remove only the noise signal and outputs a voice estimation signal. And, the output unit 30 is configured to output the voice estimation signal of the adaptive filter unit 20, the input unit 10 inputs a voice signal mixed with a noise signal through the microphone 11, the output The unit 30 is configured to output the sound estimation signal as airwaves through the antenna ANT of the transmitter 31.

여기서, s(t)는 음성신호, n(t)는 잡음신호, s´(t)는 음성추정신호, n´(t)는 잡음추정신호이다.Here, s (t) is a speech signal, n (t) is a noise signal, s '(t) is a speech estimation signal, and n' (t) is a noise estimation signal.

또한, 상기 적응필터부(20)는 잡음신호(n(t))가 혼입된 음성신호(s(t) + n(t))를 소정시간동안 지연시켜 음성신호(s(t))와 잡음신호(n(t))를 분리하는 시간 지연회로(21)와 상기 시간지연회로(21)를 거친 음성신호(s(t))와 잡음신호(n(t))를 LMS(Least-Mean-Square)신호처리 알고리즘을 적용하여 음성추정신호(s´(t))를 출력하는 적응신호처리회로(22), 및 잡음신호(n(t))가 혼입된 음성신호(s(t) + n(t))와 음성추정신호(s´(t))를 가산하여 출력된 잡음추정신호(n´(t))를 상기 적응신호처리회로(22)에 인가하는 가산기(23)로 구성됨이 바람직하다.In addition, the adaptive filter unit 20 delays the voice signal s (t) + n (t) in which the noise signal n (t) is mixed for a predetermined time and the noise signal s (t) and the noise. The time delay circuit 21 separating the signal n (t) and the voice signal s (t) and the noise signal n (t) passed through the time delay circuit 21 are LMS (Least-Mean-). Adaptive signal processing circuit 22 for outputting speech estimation signal s' (t) by applying a square signal processing algorithm, and speech signal s (t) + n mixed with noise signal n (t) (t)) and an adder 23 for applying the noise estimation signal n '(t) output by adding the voice estimation signal s' (t) to the adaptive signal processing circuit 22. Do.

이때, 상기 적응신호처리회로(22)는 LMS(Least-Mean-Square)신호처리 알고리즘을 적용하여 음성추정신호(s´(t))를 출력하도록 한다.In this case, the adaptive signal processing circuit 22 outputs a speech estimation signal s' (t) by applying a Least-Mean-Square (LMS) signal processing algorithm.

또한, 본 발명에 따른 통신단말기의 음성필터링장치의 제 2 실시예로서 도 2에 도시된 바와 같이 상기 입력부(10)는 수신부(12)의 안테나(ANT)를 통하여 잡음신호가 혼입된 음성신호(s(t) + n(t))를 입력하며, 상기 출력부(30)는 스피커(32)를 통하여 음성추정신호 (s´(t))를 출력하도록 구성함도 가능하다.In addition, as shown in FIG. 2 as a second embodiment of the voice filtering device of the communication terminal according to the present invention, the input unit 10 includes a voice signal in which a noise signal is mixed through an antenna ANT of the receiver 12. s (t) + n (t)) is input, and the output unit 30 may be configured to output a voice estimation signal s' (t) through the speaker 32.

한편, 도 3은 시간지연에 따른 음성신호(s(t)) 및 잡음신호(n(t))의 자기상관함수(Autocorrelation function)를 나타낸 도면이다.3 is a diagram illustrating an autocorrelation function of the voice signal s (t) and the noise signal n (t) according to time delay.

여기서, R(K)는 각 신호의 자기상관함수, K는 이산시간, Kn은 잡음신호의 자기상관길이(Self-correlation length), Ks는 음성신호의 자기상관길이, Δ는 Ks와 Kn의 시간지연 차를 나타낸다.Where R (K) is the autocorrelation function of each signal, K is the discrete time, Kn is the self-correlation length of the noise signal, Ks is the autocorrelation length of the speech signal, and Δ is the time of Ks and Kn. Delay difference.

이와 같이 구성된 본 발명의 작용을 더욱 상세히 설명하면 다음과 같다.Referring to the operation of the present invention configured in this way in more detail as follows.

먼저, 통신단말기를 이용하여 음성송신을 할 경우, 입력부(10)는 마이크로폰(11)을 통하여 음성신호를 입력한다. 이때, 이 음성신호에는 주위의 각종 소음등의 잡음신호가 혼입된 음성신호(s(t) + n(t))를 입력하게 된다.First, when voice is transmitted using a communication terminal, the input unit 10 inputs a voice signal through the microphone 11. At this time, the audio signal s (t) + n (t) into which the noise signal such as various noises in the surroundings is mixed is input.

이후, 적응필터부(20)는 상기 입력부(10)의 잡음신호가 혼입된 음성신호(s(t) + n(t))를 필터링하여 잡음신호(n(t))만을 선택적으로 제거하고 음성추정신호(s´(t))를 출력한다.Thereafter, the adaptive filter unit 20 selectively filters only the noise signal n (t) by filtering the voice signal s (t) + n (t) in which the noise signal of the input unit 10 is mixed. The estimated signal s' (t) is output.

이를 좀더 상세히 설명하면, 먼저 잡음신호(n(t))가 혼입된 음성신호(s(t) + n(t))는 시간지연회로(21)로 입력되어 도 3에 도시된 바와 같이 소정시간동안 지연시킴으로써 음성신호(s(t))와 잡음신호(n(t))를 효과적으로 분리하기 위한 예비신호처리를 수행한다.In more detail, first, the voice signal s (t) + n (t) into which the noise signal n (t) is mixed is inputted to the time delay circuit 21, and as shown in FIG. Preliminary signal processing is performed to effectively separate the voice signal s (t) and the noise signal n (t) by delaying the signal.

여기서, 시간지연 차(Δ)의 결정은 수식 kn≤Δ≤ks와 같이 각각의 자기상관길이 kn, ks의 사이값을 갖도록 함이 바람직하다.Here, it is preferable to determine the time delay difference Δ so as to have a value between the autocorrelation lengths kn and ks, as in the equation kn ≦ Δ ≦ ks.

이후, 적응신호처리회로(22)를 통하여 상기 시간지연회로(21)를 거친 음성신호 s(t)와 잡음신호 n(t)를 LSM(Least-Mean-Square) 신호처리 알고리즘을 적용하여 음성신호 s(t)와 잡음신호 n(t)를 분리하여 음성추정신호(s´(t))를 출력하되, 상기 LSM(Least-Mean-Square)신호처리 알고리즘 구동에 필요한 잡음신호(n(t))는 가산기(23)에서 출력된 잡음추정신호(n´(t))를 적용하며, 또한 상기 가산기(23)에서 출력된 잡음추정신호(n´(t))는 음성신호(s(t))와 잡음신호(n(t))와의 오차를 나타낸 오차신호로써 LMS(Least-Mean-Square)신호처리 알고리즘에 적용됨에 따라 송신부(31)에 출력되는 음성신호(s(t))의 오차의 통계적 에너지를 최소화 함으로써 잡음이 완벽히 제거될 수 있다.Thereafter, the voice signal s (t) and the noise signal n (t) that have passed through the time delay circuit 21 through the adaptive signal processing circuit 22 are applied to the Least-Mean-Square (LSM) signal processing algorithm. The noise estimation signal s' (t) is output by separating the s (t) and the noise signal n (t), but the noise signal n (t) necessary for driving the Least-Mean-Square (LSM) signal processing algorithm. ) Applies the noise estimation signal n '(t) output from the adder 23, and the noise estimation signal n' (t) output from the adder 23 is an audio signal s (t). Error signal representing the error between the noise signal n (t) and the noise signal s (t) output to the transmitter 31 according to the Least-Mean-Square (LMS) signal processing algorithm. Noise can be completely removed by minimizing statistical energy.

한편, 상술한 바와 같은 LMS(Least-Mean-Square)신호처리 알고리즘을 이용한 음성필터링 작용은 통신단말기에 내장되어 있는 기존 DSP칩에 입력시킬 수도 있고, 음성필터링 전용의 ASIC을 구현하여 사용할 수도 있는 것이다.Meanwhile, the voice filtering action using the Least-Mean-Square (LMS) signal processing algorithm as described above may be input to an existing DSP chip embedded in a communication terminal, or may be implemented by implementing an ASIC dedicated to voice filtering. .

상술한 바와 같이 본 발명에 따른 통신단말기의 음성필터링장치는 통신단말기의 송수신시, 음성신호에 혼합된 잡음신호만을 선택적으로 제거함으로써 고품질의 음성신호를 송수신할 수 있고, 또한 적응처리신호회로에 가산기로부터 입력되는 잡음추정신호를 음성신호와 잡음신호의 오차신호로써 LMS신호처리 알고리즘을 적용함으로 미세한 잡음까지 제거할 수 있는 있다.As described above, the voice filtering device of the communication terminal according to the present invention can transmit and receive high quality voice signals by selectively removing only the noise signal mixed with the voice signal when the communication terminal transmits and receives, and adds to the adaptive processing signal circuit. By applying the LMS signal processing algorithm as the error signal of the voice signal and the noise signal input from the noise estimation signal can be removed even fine noise.

또한, 적응필터부를 통하여 음성신호에 혼입된 잡음신호만을 제거함으로, 종래 통신단말기의 필터를 통해 잡음신호와 함께 감쇄된 음성신호를 인식 가능한 소정레벨로 증폭시키기 위하여 부가되는 각종 증폭 회로를 삭제할 수 있는 다른 효과가 있다.In addition, by removing only the noise signal mixed into the voice signal through the adaptive filter unit, various amplification circuits added to amplify the voice signal attenuated with the noise signal through the filter of the conventional communication terminal to a predetermined level can be deleted. It has a different effect.

Claims (4)

잡음신호가 혼입된 음성신호를 입력하는 입력부;An input unit for inputting a voice signal mixed with a noise signal; 상기 입력부(10)에서 출력된 잡음신호가 혼입된 음성신호를 소정시간동안 지연시켜 음성신호와 잡음신호를 분리하는 시간지연회로와, 상기 시간지연회로를 거친 음성신호와 잡음신호를 LMS(Least-Mean-Square)신호처리 알고리즘을 적용함으로 음성추정신호를 출력하는 적응신호처리회로와, 잡음신호가 혼입된 음성신호와 음성추정신호를 가산하여 출력된 잡음추정신호를 상기 적응신호처리회로에 인가하는 가산기로 구성된 적응필터부; 및A time delay circuit for separating the voice signal and the noise signal by delaying the voice signal mixed with the noise signal output from the input unit 10 for a predetermined time, and the LMS (Least-) An adaptive signal processing circuit for outputting a speech estimation signal by applying a signal processing algorithm, and applying the output noise estimation signal to the adaptive signal processing circuit by adding a speech signal and a speech estimation signal mixed with a noise signal An adaptive filter comprising an adder; And 상기 적응필터부의 음성추정신호를 출력하는 출력부를 포함하는 것을 특징으로 하는 통신단말기의 음성필터링장치.And an output unit for outputting a voice estimation signal of the adaptive filter unit. 제 1 항에 있어서, 상기 입력부는 마이크로폰을 통하여 잡음신호가 혼입된 음성신호를 입력하며, 상기 출력부는 송신부의 안테나(ANT)를 통하여 음성추정신호를 공중파로 출력하도록 함을 특징으로 하는 통신단말기의 음성필터링장치.The communication terminal of claim 1, wherein the input unit inputs a voice signal into which a noise signal is mixed through a microphone, and the output unit outputs the voice estimation signal as an air wave through an antenna ANT of the transmitter unit. Voice filtering device. 제 1 항에 있어서, 상기 입력부는 마이크로폰을 통하여 잡음신호가 혼입된 음성신호를 입력하며, 상기 출력부는 송신부의 안테나를 통하여 음성추정신호를 공중파로 출력하도록 함을 특징으로 하는 통신단말기의 음성필터링장치.The voice filtering device of claim 1, wherein the input unit inputs a voice signal into which a noise signal is mixed through a microphone, and the output unit outputs a voice estimation signal as an air wave through an antenna of a transmitter. . 제 1 항에 있어서, 상기 가산기에서 출력되어 상기 적응신호처리회로에 입력되는 잡음추정신호는 필터의 오차신호로써 상기 LMS(Least-Mean-Square)신호처리 알고리즘에 적용됨에 따라 잡음이 혼입된 음성신호에서 잡음신호를 제거하는 필터링시에 발생되는 오차를 최소화함을 특징으로 하는 통신단말기의 음성필터링장치.The noise estimation signal output from the adder and input to the adaptive signal processing circuit is an error signal of a filter and is applied to the Least-Mean-Square (LMS) signal processing algorithm. Voice filtering device of a communication terminal, characterized in that for minimizing the error generated during the filtering to remove the noise signal.
KR1019970040802A 1997-08-26 1997-08-26 Apparatus of a sound filtering for a communication terminal equipment KR100255935B1 (en)

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KR930011475A (en) * 1991-11-26 1993-06-24 정용문 Echo Cancellation Circuit and Method of Vehicle Telephone
KR960028203A (en) * 1994-12-13 1996-07-22 정장호 Video camera device
KR19990017778A (en) * 1997-08-26 1999-03-15 윤종용 Voice filtering device of communication terminal
KR19990017779A (en) * 1997-08-26 1999-03-15 윤종용 Voice filtering device of communication terminal

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KR100800671B1 (en) * 2001-09-05 2008-02-01 삼성전자주식회사 Apparatus for compensating a voice frequency characteristic of speaker for use in a mobile communication terminal

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