• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
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    • 专利摘要:
    PURPOSE: An apparatus for canceling noise in a digital portable phone is provided to improve call quality by receiving a noise signal through a channel among multiple channels and selectively canceling a portion equivalent to the noise signal from voice signals inputted to other channels. CONSTITUTION: An apparatus for canceling noise in a digital portable phone is comprised of the first microphone(100), the second microphone(200), an adaptive filter(300), and a subtracter(400). The first microphone(100) receives a caller's voice signal in a call mode. The second microphone(200) receives a noise signal around the caller in the call mode. The adaptive filter(300) filters the noise signal of the second microphone(200) with the adjustment of its own parameter so as to respond to the waveform of a voice signal of the subtracter(400). The subtracter(400) receives the voice signal from the first microphone(100) and subtracts it from the filtered signal of the adaptive filter(300).
    公开号:KR20010081857A
    申请号:KR1020000008040
    申请日:2000-02-19
    公开日:2001-08-29
    发明作者:이윤근；이종석
    申请人:구자홍；엘지전자주식회사；
    IPC主号:
    专利说明:

    Noise Reduction Device for Digital Portable Phones {NOISE REMOVE APPARATUS FOR DIGITAL PORTABLE TELEPHONE}
    [7] The present invention relates to a noise canceling apparatus for a digital portable telephone, and more particularly, to a noise canceling apparatus for a digital portable telephone capable of removing noise included in a voice signal during a call.
    [8] In recent years, the use of portable telephones is rapidly spreading, and these portable telephones are frequently affected by ambient noise due to frequent telephone conversations on public roads, cars, and trains.
    [9] Therefore, the peripheral noise canceling function is essentially equipped to improve the sound quality of the call.
    [10] Currently, digital portable telephones are equipped with a digital speech coder to perform a noise canceling function, which only removes noise from speech input through a single channel.
    [11] That is, the noise canceling method removes a signal having a specific statistical characteristic by using the statistical characteristic of the noise, and has a relatively good characteristic with respect to noise having a certain statistical characteristic, such as an automobile noise, Noise rejection performance is reduced.
    [12] That is, in the conventional method, the noise signal inputted simultaneously with the voice signal is removed by using a single channel. Since the noise is removed by using the statistical characteristics of the noise, the standardized noise signal elimination performance is good, but the atypical performance is irregular. There is a problem in that the performance of canceling the reduced noise is degraded.
    [13] Therefore, the present invention devised in view of the above-described problems, by receiving only a noise signal into one channel using multiple channels and selectively removing only the portion corresponding to the noise signal from the voice signal input to the other channel of the call It is an object of the present invention to provide a noise canceling device for a digital portable telephone capable of improving sound quality.
    [1] Figure 1 is a block diagram showing the configuration of the noise canceling device of the digital portable telephone of the present invention.
    [2] Figure 2 is an embodiment showing a state in which the noise reduction device of the present invention digital portable telephone is applied.
    [3] Figure 3 is a schematic diagram showing the appearance of a general telephone to which the present invention is applied.
    [4] ***** Description of the symbols for the main parts of the drawings *****
    [5] 100: first microphone 200: second microphone
    [6] 300: adaptive filter 400: subtractor
    [14] According to an aspect of the present invention, there is provided a portable telephone, comprising: a first microphone for receiving a voice signal of a caller in a call mode; A second microphone for receiving a noise signal around a caller in a call mode; An adaptive filter for adjusting and filtering its own parameters so as to respond to a waveform of a voice signal of a subtractor, which will be described later; And a subtractor for receiving a voice signal from the first microphone and subtracting the voice signal from the filtering signal of the adaptive filter and outputting the voice signal accordingly.
    [15] Hereinafter, with reference to the accompanying drawings, the operation and effects of the noise canceller of the digital portable telephone according to the present invention will be described in detail.
    [16] 1 is a block diagram of an apparatus for removing noise in a digital portable telephone according to the present invention, as shown in FIG. 1, with a first microphone 100 receiving a voice signal of a caller in a call mode; A second microphone 200 for receiving a noise signal around a caller in a call mode; An adaptive filter (300) for adjusting and filtering its own parameters so as to respond to the waveform of the voice signal of the subtractor (400) which will be described later with the noise signal of the second microphone (200); A subtractor 400 for receiving a voice signal from the first microphone 100 and subtracting the voice signal from the filtering signal of the adaptive filter 300 and outputting the voice signal according to the present invention will be described. .
    [17] First, a talker inputs a voice signal through the first microphone 100 during a call, and the voice signal is input by including a surrounding noise signal.
    [18] On the other hand, the second microphone 200 receives the surrounding noise signal and outputs it to the adaptive filter 300, and then the adaptive filter 300 responds to the noise signal included in the voice signal of the subtractor 400, which will be described later. The noise signal input from the second microphone 200 is filtered so as to be converted into a form similar to the voice signal input to the first microphone 100 and output.
    [19] Subsequently, the subtractor 400 subtracts the output signal of the adaptive filter 300 and the voice signal input from the first microphone 100 and outputs a voice signal from which a noise signal is removed. The voice signal is a noise signal. The filter is fed back to the adaptive filter 300 until nearly is removed to control the filtering by changing the parameters of the adaptive filter 300.
    [20] In other words, the voice signal including the noise input to the first microphone 100 is used as the main signal, and the noise signal input to the second microphone 200 is used as the reference signal. The filter is filtered in a form similar to the noise signal included in the main signal and outputted to the subtractor 400.
    [21] Then, the subtractor 400 extracts the voice signal from which the noise is removed by subtracting the filtered signal received from the adaptive filter 300 from the main signal (voice signal) received by the first microphone 100.
    [22] At this time, the signal is fed back to the adaptive filter 300 until the noise signal included in the voice signal output from the subtractor 400 is minimized.
    [23] Accordingly, the adaptive filter 300 adjusts its own parameter so as to accurately respond to the noise signal included in the voice signal, and performs filtering of the noise signal to repeat the filtering of the main signal input to the first microphone 100. Remove the noise.
    [24] In this case, if the noise cancellation method as described above is applied to the voice recognition phone, the ambient noise may be removed from the input voice, thereby improving the voice recognition performance.
    [25] In this case, as shown in FIG. 2, the second microphone 200 is located on the outer back of the portable telephone to receive the ambient noise signal.
    [26] 3 is a schematic view showing a state when the present invention is applied to a general telephone.
    [27] In other words, the present invention attaches the second microphone 200 which receives only the noise signal of the surroundings to the back of the portable telephone, the noise signal inputted to the second microphone 200 and the talker inputted to the first microphone 100. Compared to the audio signal of the noise by removing the noise to improve the voice quality.
    [28] As described in detail above, by using the two channels to remove ambient noise from the voice signal of the caller in the call mode, a clearer call quality can be obtained, and when applied to a voice recognition phone, the voice recognition performance can be improved. There is.
    权利要求:
    Claims (2)
    [1" claim-type="Currently amended] A digital portable telephone, comprising: a first microphone for receiving a voice signal of a caller in a call mode; A second microphone for receiving a noise signal around a caller in a call mode; An adaptive filter for adjusting and filtering its own parameters so as to respond to a waveform of a voice signal of a subtractor, which will be described later; And a subtractor for receiving a voice signal from the first microphone and subtracting the voice signal from the filtering signal of the adaptive filter and outputting the voice signal accordingly.
    [2" claim-type="Currently amended] The noise canceling device of a digital portable telephone according to claim 1, wherein the second microphone is attached to an external backside of the portable telephone.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2000-02-19|Application filed by 구자홍, 엘지전자주식회사
    2000-02-19|Priority to KR1020000008040A
    2001-08-29|Publication of KR20010081857A
    优先权:
    申请号 | 申请日 | 专利标题
    KR1020000008040A|KR20010081857A|2000-02-19|2000-02-19|Noise remove apparatus for digital portable telephone|
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