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Signal processing device

A signal processing device and signal technology, applied in transducer circuits, speech analysis, instruments, etc., to achieve the effect of simplifying the hardware structure, reducing the manufacturing cost, and simplifying the circuit structure

Inactive Publication Date: 2012-11-28
NARA INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In addition, this problem is not limited to sound waves, and also occurs in the case of restoring a source signal output from a target fluctuation source among a plurality of fluctuation sources to a target signal, such as electromagnetic waves and brain waves.

Method used

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Embodiment 1

[0048] (1.1. Structure of signal processing device)

[0049] figure 1 It is a block diagram showing an example of the configuration of the signal processing device 1 of the first embodiment. Here, the signal processing device 1 is a signal processing device that restores a source signal output from a target sound source 10 among a plurality of sound sources (fluctuation sources) 10 (10a, 10b) to a target signal. In the signal processing device 1 , as a separation method, a closed sound source separation method based on a so-called independent component analysis method is adopted.

[0050] Such as figure 1 As shown, the signal processing device 1 mainly includes an observation unit 15 , a separated signal generation unit 20 , a mask processing unit 30 , a noise amount measurement unit 40 , a noise signal selection unit 50 , and a noise removal processing unit 60 .

[0051] Each of the plurality of microphones 15 (15a, 15b) is an observation means for observing a mixed signal...

Embodiment 2

[0115] Next, Embodiment 2 of the present invention will be described. The signal processing device 100 of the second embodiment is the same as that of the first embodiment except that the configuration of the noise amount measuring unit 140 is different from that of the first embodiment. Therefore, the following description will focus on this difference. In addition, in the following description, the same reference numerals are assigned to the same constituent elements as those in the first signal processing device 1 . Since these structural elements with the same reference numerals have already been described in Embodiment 1, description thereof will be omitted in this embodiment.

[0116] (2.1. Structure of signal processing device)

[0117] Figure 10 It is a block diagram showing an example of the overall configuration of the signal processing devices 100 and 200 in the second and third embodiments. Figure 11 It is a block diagram showing an example of the structure o...

Embodiment 3

[0130] Next, Embodiment 3 of the present invention will be described. The signal processing device 200 of the third embodiment is the same as that of the first embodiment except that the configuration of the noise amount measuring means 240 is different from that of the first embodiment. Therefore, the following description will focus on this difference. In addition, in the following description, the same reference numerals are assigned to the same constituent elements as those in the first signal processing device 1 . Since these structural elements with the same reference numerals have already been described in Embodiment 1, their description is omitted in this embodiment.

[0131] (3.1. Structure of signal processing device)

[0132] Figure 12It is a block diagram showing an example of the structure of the noise amount measuring means 240 of the third embodiment. Figure 13 and Figure 14 is a diagram for explaining the state of expansion of the second split signal. ...

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Abstract

It is possible to provide a signal processing device which can preferably restore a target original signal from a mixed signal obtained by mixing a plurality of original signals. An isolated signal generation unit (20) generates a plurality of isolated signals independent from one another from one frame of the mixed signal converted into a frequency region. According to a first and a second isolated signal, a mask processing unit (30) judges the noise state of the first separated signal for each of frequency bins. Moreover, the mask processing unit (30)removes from the first isolated signal, a first noise component obtained according to the judgment result of the noise state. A noise amount measuring unit (40) measures a noise amount of the first isolated signal. According to the noise amount measured by the noise amount measuring unit, a noise signal selection unit (50) selects a noise signal for each of frequencies. A noise removal processing unit (60) removes the second noise component form the noise removal signal inputted from the mask processing unit (30) for each of the frequency bins. The noise removal processing unit (60) outputs as a target signal, the noise-removed signal from which the second noise component has been removed.

Description

technical field [0001] The present invention relates to a signal processing device for restoring a source signal output from a target fluctuation source among a plurality of fluctuation sources to a target signal. Background technique [0002] Conventionally, a technique is known in which, for sound source signals output from a plurality of sound sources, sound source separation processing using a closed (blind) sound source separation method based on an independent component analysis method based on a frequency domain, based on superimposed sound source signals A plurality of audio source signals are mixed to generate separate signals corresponding to the audio source signals (for example, Patent Document 1 to Patent Document 3). [0003] In the technique of Patent Document 1, a SIMO (single-input multiple output) signal is generated as a plurality of separate signals for each frequency bin. Next, for each frequency region, among the plurality of separated signals, a first...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00G10L21/02G10L21/0208G10L21/0232G10L21/0264G10L21/028
CPCG10L21/028H04R3/00G10L21/0208
Inventor 猿渡洋森康充马场荣治
Owner NARA INSTITUTE OF SCIENCE AND TECHNOLOGY
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