JP2003111185A - Sound collector - Google Patents
Sound collectorInfo
- Publication number
- JP2003111185A JP2003111185A JP2001296418A JP2001296418A JP2003111185A JP 2003111185 A JP2003111185 A JP 2003111185A JP 2001296418 A JP2001296418 A JP 2001296418A JP 2001296418 A JP2001296418 A JP 2001296418A JP 2003111185 A JP2003111185 A JP 2003111185A
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- Prior art keywords
- band
- sound source
- microphone
- signal
- microphones
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- Circuit For Audible Band Transducer (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、空間に目的音源と
雑音源の位置が与えられている場合、少なくとも２本以
上のマイクを用いて、空間を複数のゾーンに分割し、目
的とするゾーンにある音源（目的音源）からの音を他ゾ
ーン（雑音源）とは独立に収音する装置に関し、特に、
マイクの配置構成に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention divides a space into a plurality of zones by using at least two microphones when the positions of a target sound source and a noise source are given to the space. A device that picks up the sound from a sound source (target sound source) independently of other zones (noise sources),
Regarding the arrangement of microphones.
【０００２】[0002]
【従来の技術】従来のゾーン分離収音技術には、例え
ば、音が持つ次のような特徴を利用したものがある。音
はいくつかの周波数成分の和として表現されることが知
られている。そこで、複数の音が同時に鳴っている場
合、各チャネルのマイクに入力される音源信号を各音源
からの周波数成分が周波数軸上で重ならない程度の帯域
に分割し、チャネル間の各周波数成分の到達時間差や到
達レベル差を基に、各周波数成分それぞれがどのゾーン
からのものであるかを判定し、同一ゾーンからの成分を
集めて合成することにより、各ゾーン毎の音を個別に収
音する方法が用いられていた。（参考：特開平１０−３
１３４９７号公報（特願平９−２５２３１２号）「音源
分離方法、装置および記録媒体」）2. Description of the Related Art Some conventional zone-separated sound collecting techniques utilize the following characteristics of sounds. It is known that sound is expressed as the sum of several frequency components. Therefore, when multiple sounds are playing at the same time, the sound source signal input to the microphone of each channel is divided into bands where the frequency components from each sound source do not overlap on the frequency axis, and Based on the arrival time difference and arrival level difference, it is determined which zone each frequency component is from, and the components from the same zone are collected and combined to collect the sound for each zone individually. The method of doing was used. (Reference: JP-A-10-3
13497 gazette (Japanese Patent Application No. 9-252312) "Sound source separation method, device and recording medium")
【０００３】[0003]
【発明が解決しようとする課題】ところが、従来の音源
分離技術における複数のマイクからなる収音手段は、複
数のマイクと各音源との配置が規定されておらず、ま
た、複数のマイクの配置が音源に対して同一直線状に並
べられた２本のマイクであったり、正三角形の頂点に配
置された３本のマイクに限定されていたため、中心角が
３６０／ｎ度（ｎはマイクの個数）の円弧のようなゾー
ン形成に限られるという欠点があった。However, the conventional sound source separation technology has a sound pickup means composed of a plurality of microphones, in which the arrangement of the plurality of microphones and the respective sound sources is not specified, and the arrangement of the plurality of microphones is not specified. Is limited to two microphones arranged in the same straight line with respect to the sound source or three microphones arranged at the vertices of an equilateral triangle, the central angle is 360 / n degrees (n is the microphone's There is a drawback that it is limited to forming zones such as (number of) arcs.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、複数のマイクの配置をその収音する対象
（予め位置が与えられている目的音源、雑音源）に応じ
て変える、すなわち、各音源と複数のマイクとの距離を
規定することで、形成できるゾーン形状の自由度を増す
ことを特徴とする。各手段の具体的な方法については次
の実施形態において説明する。In order to solve the above-mentioned problems, the present invention changes the arrangement of a plurality of microphones according to the object to be picked up (target sound source, noise source whose position is given in advance). That is, the degree of freedom of the zone shape that can be formed is increased by defining the distance between each sound source and a plurality of microphones. The specific method of each means will be described in the following embodiment.
【０００５】[0005]
【発明の実施の形態】（請求項１の発明の実施例）図１
に、請求項１の発明の実施例である収音装置の構成を示
す。目的音源Ａはマイク２（１−２）に比べてマイク１
（１−１）に近く（a2＞a1）配置する。一方、雑音源
Ｂ,Ｃ,・・は、マイク１に比べてマイク２の近くに配置
する（例えば、c1＞c2，b1＞b2,・・）。ここで、目的
音源Ａ、雑音源Ｂ,Ｃ,・・・の位置は予め設定され、ま
た、a,b,c,・・は各音源と各マイク間の距離を示す。目
的音源Ａ、雑音源Ｂ,Ｃ,・・からの音響信号SA(n),S
B(n),SC(n),・・・（(n)：時間）はマイク１,２で収音
し、電気信号（チャネル信号）x1(n),x2(n)に変換す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment of the Invention of Claim 1) FIG.
The configuration of the sound collecting device according to the first embodiment of the present invention is shown in FIG. Target sound source A is microphone 1 compared to microphone 2 (1-2)
Place it near (1-1) (a2> a1). On the other hand, the noise sources B, C, ... Are arranged closer to the microphone 2 than the microphone 1 (for example, c1> c2, b1> b2, ...). Here, the positions of the target sound source A and the noise sources B, C, ... Are preset, and a, b, c, ... Show the distance between each sound source and each microphone. Acoustic signal S A (n), S from the target sound source A and noise sources B, C, ...
B (n), S C (n), ... ((n): time) is picked up by microphones 1 and 2 and converted to electrical signals (channel signals) x 1 (n), x 2 (n) To do.
【０００６】２の帯域分割手段において周波数分析され
たマイク１，２からの信号x1(n),x2(n)をそれぞれ、式
（１）、（２）で表す。
X1(f)＝|X1(f)|exp(j argX1(f)) （１）
X2(f)＝|X2(f)|exp(j argX2(f)) （２）
また、４の帯域別パラメータ値差検出手段で検出される
チャネル間時間差およびチャネル間レベル差を式
（３）、（４）のように定義する。Signals x 1 (n) and x 2 (n) from the microphones 1 and 2 that have been frequency-analyzed by the band dividing means 2 are represented by equations (1) and (2), respectively. X 1 (f) ＝ | X 1 (f) | exp (j argX 1 (f)) (1) X 2 (f) ＝ | X 2 (f) | exp (j argX 2 (f)) (2) Further, the inter-channel time difference and inter-channel level difference detected by the band-specific parameter value difference detection means of 4 are defined as in equations (3) and (4).
【０００７】
Δφ(f)＝argX1(f)−argX2(f) （３）
ΔＡ(f)＝２０log10(|X1(f)|／|X2(f)|) （４）
図１のような配置にすることで、目的音源については、
Δφ(f)＞０、かつΔＡ(f)＞０となる。逆に、雑音源に
ついては、Δφ(f)＜０、かつΔＡ(f)＜０となる。よっ
て、５の音源信号判定手段において、ある正の値γ1、
γ2とある負の値γ3、γ4を定め、
Δφ(f)＞γ1 （５）
ΔＡ(f)＞γ2 （６）
を満たす周波数成分を目的音源の周波数成分として判定
し、
Δφ(f)＜γ3 （７）
ΔＡ(f)＜γ4 （８）
を満たす周波数成分を雑音源の周波数成分として判定す
る。すなわち、チャネル間パラメータ差に基づいて対応
する周波数成分がいずれの音源に属するかを判定する。
ここでγは所望の（設定された）Ｓ／Ｎ（例えば、２０
dB）を得ることのできる閾値とする。Δφ (f) = argX 1 (f) −argX 2 (f) (3) ΔA (f) = 20 log 10 (| X 1 (f) | / | X 2 (f) |) (4) By arranging as in 1, the target sound source,
Δφ (f)> 0 and ΔA (f)> 0. On the contrary, for the noise source, Δφ (f) <0 and ΔA (f) <0. Therefore, in the sound source signal determination means of 5, a certain positive value γ1,
γ2 and certain negative values γ3 and γ4 are determined, and the frequency component satisfying Δφ (f)> γ1 (5) ΔA (f)> γ2 (6) is determined as the frequency component of the target sound source, and Δφ (f) <γ3 (7) A frequency component satisfying ΔA (f) <γ4 (8) is determined as a noise source frequency component. That is, it is determined to which sound source the corresponding frequency component belongs based on the parameter difference between channels.
Here, γ is a desired (set) S / N (for example, 20
dB) is the threshold value that can be obtained.
【０００８】６の音源信号選択手段および７の音源信号
合成手段は従来技術（前記公報参照）と同様とする。音
源信号選択手段６は、音源判定信号に基づき、帯域分割
された各出力チャネル信号の内、同一音源（目的音源
Ａ）から入力された信号を少なくとも１つ選択して選択
音源信号を出力し、音源信号合成手段７は、選択された
複数の帯域信号を合成して目的音源Ａの音源信号SA^(n)
を出力する。The sound source signal selecting means 6 and the sound source signal synthesizing means 7 are the same as those in the prior art (see the above publication). The sound source signal selection means 6 selects at least one signal input from the same sound source (target sound source A) among the band-divided output channel signals based on the sound source determination signal, and outputs the selected sound source signal, The sound source signal synthesizing means 7 synthesizes a plurality of selected band signals to generate a sound source signal S A ^ (n) of the target sound source A.
Is output.
【０００９】上記構成にすることで、目的音源の近傍の
み高いＳ／Ｎで収音することができる。ここで雑音源の
配置は、上記で示したc1＞c2，b1＞b2の条件が各雑音源
について満たされていれば良い。例えば、雑音源がある
環境でのデスクトップ通信において、デスクトップの前
に座っている話者の声のみクリアに収音したい場合、マ
イク１をディスプレイの正面付近に配し、マイク２を主
音声話者の後ろ（座席に座っている場合には、例えば、
座席の背もたれ等）に配置することで、図１の構成を実
現することができる。With the above configuration, it is possible to pick up sound only with a high S / N ratio in the vicinity of the target sound source. Here, the noise sources may be arranged as long as the conditions of c1> c2 and b1> b2 shown above are satisfied for each noise source. For example, in desktop communication in an environment with a noise source, if you want to collect only the voice of the speaker sitting in front of the desktop in a clear manner, place the microphone 1 near the front of the display and set the microphone 2 as the main voice speaker. Behind (if you are sitting in a seat, for example,
The configuration of FIG. 1 can be realized by arranging it on a seat back (for example).
【００１０】（請求項２の発明の実施例１）図２に請求
項２の発明の実施例１である収音装置（マイクの配置例
（その１））の構成を示す。請求項１の発明との違い
は、目的音源に比べて雑音源に近く配されたマイクが２
本以上あること、及び、雑音源の近くに配されたマイク
の出力信号を加算する、信号加算手段１１を追加したと
ころにある。雑音源の近くに配されたマイク３〜６（１
−３〜１−６）は、図２のように、雑音源の個数と同じ
であっても、雑音源の個数より多くても、少なくても良
い。いずれの場合においても、b1＞b3,c1＞c4,d1＞d5,
・・・となる関係が保たれるように配置されれば良い。(Embodiment 1 of the Invention of Claim 2) FIG. 2 shows the configuration of a sound collecting device (example of arrangement of microphones (No. 1)) which is Embodiment 1 of the invention of Claim 2. The difference from the invention of claim 1 is that the microphone placed closer to the noise source is
There are more than one, and the signal adding means 11 for adding the output signals of the microphones arranged near the noise source is added. Microphones 3 to 6 (1 located near the noise source
-3 to 1-6) may be the same as the number of noise sources as shown in FIG. 2, or may be more or less than the number of noise sources. In any case, b1> b3, c1> c4, d1> d5,
It may be arranged so that the relationship of ... Is maintained.
【００１１】このように配置されたマイクに対し、７の
信号加算手段においては、雑音源の近くに配置されたマ
イク３〜６（１−３〜１−６）の出力x3(n)〜x6(n)を加
算し、その信号x(n)を帯域分割手段３へ供給する。帯域
分割手段以降の手段は請求項１の発明の実施例と同様で
ある。In contrast to the microphone arranged in this way, in the signal adding means 7 the output x 3 (n) of the microphones 3 to 6 (1-3 to 1-6) arranged near the noise source x 6 (n) is added and the signal x (n) is supplied to the band dividing means 3. The means after the band dividing means is the same as that of the embodiment of the invention of claim 1.
【００１２】（請求項２の発明の実施例２）次に請求項
２の発明の実施例２である収音装置におけるマイクの配
置例（その２）について説明する。図３に、マイクの配
置例を示す。例えば車内では、各発話者が発声する位置
がある程度固定されているため、各話者の付近にマイク
を配置することで、各席の声を高Ｓ／Ｎで収音すること
ができる。図３で、マイク１（１−１），マイク１１
（１−１１）、マイク１２（１−１２）は運転席（ドラ
イバー）の声を他の席に比べて大きく収音するためのマ
イクであり、このうちの少なくとも１本を使用する。マ
イク１の配置個所は例えば、運転席話者口元に近い位置
で、なおかつ、天井に配されたマイクである。マイク１
１は、例えば、ハンドル付近に配される。マイク１２
は、例えば、運転席右側の窓付近に配される。(Embodiment 2 of the invention of claim 2) Next, a description will be given of an arrangement example (2) of microphones in the sound collecting device which is embodiment 2 of the invention of claim 2. FIG. 3 shows an arrangement example of microphones. For example, since the position where each speaker utters is fixed to some extent in the car, by arranging a microphone near each speaker, the voice of each seat can be picked up with high S / N. In FIG. 3, microphone 1 (1-1) and microphone 11
(1-11) and the microphone 12 (1-12) are microphones for collecting the voice of the driver's seat (driver) louder than other seats, and at least one of them is used. The location of the microphone 1 is, for example, a microphone located near the mouth of the speaker in the driver's seat and on the ceiling. Microphone 1
1 is arranged near the handle, for example. Microphone 12
Is arranged near the window on the right side of the driver's seat, for example.
【００１３】同様に、助手席の声をメインに収音するた
めのマイクとして、例えば、マイク２（１−２）、マイ
ク３（１−３）、マイク４（１−４）を図に示すように
配することができる。マイク２は助手席話者口元に近い
位置で、なおかつ、天井に配されたマイクである。マイ
ク３は例えば、サンバイザー付近に配されたマイクであ
る。後部座席についても同様であり、例えば、マイク５
（１−５）は助手席背もたれ付近に配されたマイクであ
り、マイク７（１−７）は後部座席左側話者口元に近い
位置で、なおかつ、天井に配されたマイクである。マイ
ク６（１−６）は、後部座席左側の窓付近に配されたマ
イクである。後部座席右側についても同様である。以上
のように配されたマイクのうち、目的音源の近辺に配さ
れた少なくとも１本のマイクと、雑音源付近に配された
少なくとも１本のマイクを用いることで目的音を高いＳ
／Ｎで収音することができる。また、以上の構成を用い
て、カーオーディオなど、人の発声以外の雑音について
も適用することができる。Similarly, for example, a microphone 2 (1-2), a microphone 3 (1-3), and a microphone 4 (1-4) are shown in the figure as microphones for mainly collecting the voice of the passenger seat. Can be arranged as The microphone 2 is located near the mouth of the speaker in the passenger seat, and is placed on the ceiling. The microphone 3 is, for example, a microphone arranged near the sun visor. The same applies to the back seat, for example, the microphone 5
(1-5) is a microphone placed near the backrest of the passenger seat, and microphone 7 (1-7) is a microphone placed near the mouth of the speaker on the left side of the rear seat and is also placed on the ceiling. The microphone 6 (1-6) is a microphone arranged near the window on the left side of the rear seat. The same applies to the right side of the rear seat. Among the microphones arranged as described above, by using at least one microphone arranged in the vicinity of the target sound source and at least one microphone arranged in the vicinity of the noise source, the target sound having a high S
You can pick up the sound with / N. Further, by using the above configuration, it is possible to apply to noises other than human utterance such as car audio.
【００１４】（請求項３の発明の実施例）図４、図５に
請求項３の発明のマイクの配置例を示す。図４のよう
に、少なくとも２本のマイクを、受聴者の両耳付近（a1
≒a2が満たされる配置）に配置する。（受聴者が真正面
付近にある音と認識できる範囲（信号の到達時間差、お
よび到達レベル差が認識できない範囲）に配置する。）
そして、５の音源信号判定手段において、チャネル間レ
ベル差及びチャネル間時間差の絶対値が、それぞれ、あ
る値α1,α2以下となる周波数帯域を、目的音源の周波
数成分として判定する。そうすることで、例えば、受聴
者の真正面付近にある音のみを高いＳ／Ｎで収音するこ
とができる。ここで、αは所定のＳ／Ｎ（例えば２０d
B）が得られる閾値に設定する。また、もう１つの配置
例として、図５のように、目的音源をディスプレイ前の
話者とした場合に、マイクをディスプレイの正面２個所
（a1≒a2が満たされる配置）に配することで、ディスプ
レイ正面の音源のみを高いＳ／Ｎで収音することができ
る。(Embodiment of the Invention of Claim 3) FIGS. 4 and 5 show examples of arrangement of microphones of the invention of claim 3. As shown in Fig. 4, use at least two microphones near the listener's ears (a1
≈ a2 is satisfied). (It is arranged in a range in which the listener can recognize the sound in the vicinity of the front (a range in which the arrival time difference of signals and the arrival level difference cannot be recognized).) Then, in the sound source signal determination means of 5, inter-channel level difference and inter-channel level The frequency bands in which the absolute values of the time differences are below certain values α1 and α2 are determined as the frequency components of the target sound source. By doing so, for example, only the sound in the vicinity of the front of the listener can be picked up with a high S / N. Here, α is a predetermined S / N (for example, 20d
B) is set to the obtained threshold. Further, as another arrangement example, as shown in FIG. 5, when the target sound source is the speaker in front of the display, the microphones are arranged at two places in front of the display (arrangement satisfying a1≈a2), Only the sound source in front of the display can be picked up with a high S / N.
【００１５】（請求項４の発明の実施例）図６に請求項
４の発明を電話機に適用した場合のマイクの配置例（そ
の１）を示し、図７にその使用例を示す。図のように配
置することで、目的音源Ａからマイク１，２に入る信号
のチャネル間レベル差は、雑音源からマイク１，２に入
る信号のチャネル間レベル差に比べて大きくなる。これ
は、信号のレベルが距離の二乗に反比例して減衰するた
めであり、一般に、近接音源のレベル差の方が遠くにあ
る音源に比べてレベル差が大きくつく性質に基づく。こ
れについて以下に示す。図７のように、目的音源Ａから
マイク１までの距離をa1、目的音源からマイク２までの
距離をa2、雑音源Ｂからマイク１までの距離をb1、雑音
源からマイク２までの距離をb2とする。ここで、下記の
式が成り立つ。
a1−a2＝ｙ1 （９）
b1−b2＝ｙ2 （１０）
よって、目的音源のチャネル間レベル差は式（９）に比
例し、雑音源のチャネル間レベル差は式（１０）に比例
する。
a12／a22＝（a2＋ｙ1）2／a22＝（１＋ｙ1／a2）2 （１１）
b12／b22＝（b2＋ｙ2）2／b22＝（１＋ｙ2／b2）2 （１２）
ここで、b2＞＞a2ならば、ｙ2／b2＜＜ｙ1／a2となるた
め、目的音源チャネル間レベル差は、雑音源からのそれ
よりも大きくつく。そのため、５の音源信号判定手段に
おいて、チャネル間レベル差の絶対値がある値β以上と
なる周波数帯域を、目的音源の周波数成分として判定す
ることで、例えば、目的音源の信号を高いＳ／Ｎで収音
することができる。ここで、 βは所望のＳ／Ｎ（例え
ば、２０dB）を得ることのできる閾値である。この考え
方は、受話器を使用する場合だけでなく、例えば、ヘッ
ドセットを使用する場合にも応用できる。その例を、図
８から図１０に示す。図８においては、マイク１（１−
１）を口元付近に配置し、マイク２（１−２）を例えば
後頭部付近に配することで、目的音源のチャネル間レベ
ル差が大きくつくように配置する。マイク２は、マイク
１に比べて口もとよりも遠い位置に置くことが条件とな
る。(Embodiment of the Invention of Claim 4) FIG. 6 shows an arrangement example (1) of microphones when the invention of Claim 4 is applied to a telephone set, and FIG. 7 shows an example of its use. By arranging as shown in the figure, the inter-channel level difference between the signals entering the microphones 1 and 2 from the target sound source A becomes larger than the inter-channel level difference between the signals entering the microphones 1 and 2 from the noise source. This is because the signal level is attenuated in inverse proportion to the square of the distance, and is generally based on the property that the level difference between adjacent sound sources has a larger level difference than that of a sound source located far away. This is shown below. As shown in FIG. 7, the distance from the target sound source A to the microphone 1 is a1, the distance from the target sound source to the microphone 2 is a2, the distance from the noise source B to the microphone 1 is b1, the distance from the noise source to the microphone 2 is b2. Here, the following formula is established. a1−a2 = y1 (9) b1−b2 = y2 (10) Therefore, the inter-channel level difference of the target sound source is proportional to the equation (9), and the inter-channel level difference of the noise source is proportional to the equation (10). a1 2 / a2 2 = (a2 + y1) 2 / a2 2 = (1 + y1 / a2) 2 (11) b1 2 / b2 2 = (b2 + y2) 2 / b2 2 = (1 + y2 / b2) 2 (12) where b2 If >> a2, then y2 / b2 << y1 / a2, so the level difference between the target sound source channels becomes larger than that from the noise source. Therefore, in the sound source signal determination means of 5, the frequency band in which the absolute value of the level difference between channels is equal to or larger than a certain value β is determined as the frequency component of the target sound source, and for example, the signal of the target sound source has a high S / N ratio. You can pick up with. Here, β is a threshold value with which a desired S / N (for example, 20 dB) can be obtained. This idea can be applied not only when using a handset but also when using a headset, for example. Examples thereof are shown in FIGS. 8 to 10. In FIG. 8, the microphone 1 (1-
1) is arranged near the mouth and the microphone 2 (1-2) is arranged near the back of the head, for example, so that the level difference between the channels of the target sound source is large. Microphone 2 is required to be placed at a position farther from the mouth than microphone 1.
【００１６】図９の場合も考え方は同様であり、マイク
１（１−１）は目的音源Ａの口元付近、マイク２（１−
２）は、例えばタイピンマイクのように体に装着しても
良い。In the case of FIG. 9, the idea is the same, and the microphone 1 (1-1) is near the mouth of the target sound source A, and the microphone 2 (1-
2) may be attached to the body like a tie-pin microphone.
【００１７】図１０の場合は、例えば壇上に居る講演者
の声を目的音声とし、講演を聴いている聴衆の声やその
他雑音を雑音源と考えた場合に、マイク１（１−１）は
目的音声の口元付近に配置し、マイク２（１−２）は例
えば壇上付近の卓上や、聴衆に比較的近い位置の天井等
に配置する。In the case of FIG. 10, for example, when the voice of the speaker on the stage is the target voice and the voice of the audience listening to the lecture or other noise is considered as the noise source, the microphone 1 (1-1) is The microphone 2 (1-2) is placed near the mouth of the target voice, for example, on the table near the podium or on the ceiling relatively close to the audience.
【００１８】[0018]
【発明の効果】本発明は、目的音源、雑音源の位置が予
め与えられている場合、その収音する対象に応じてマイ
クの配置を変えることで、形成できるゾーン形状の自由
度を増し、目的音源の音響信号を高Ｓ／Ｎで分離するこ
とができる。As described above, according to the present invention, when the positions of the target sound source and the noise source are given in advance, the degree of freedom of the zone shape that can be formed is increased by changing the arrangement of the microphones according to the object to be picked up. The acoustic signal of the target sound source can be separated with high S / N.
【図１】請求項１の発明の実施例である収音装置の構成
図。FIG. 1 is a configuration diagram of a sound collecting device that is an embodiment of the invention of claim 1.
【図２】請求項２の発明の実施例である収音装置（マイ
クの配置例（その１））の構成図。FIG. 2 is a configuration diagram of a sound collecting device (example of arranging microphones (1)) that is an embodiment of the invention of claim 2;
【図３】請求項２の発明のマイクの配置例（その２）を
示す図。FIG. 3 is a diagram showing an arrangement example (No. 2) of microphones according to the invention of claim 2;
【図４】請求項３の発明のマイクの配置例（その１）を
示す図。FIG. 4 is a view showing an arrangement example (1) of microphones according to the invention of claim 3;
【図５】請求項３の発明のマイクの配置例（その２）を
示す図。FIG. 5 is a diagram showing an arrangement example (No. 2) of the microphones according to the third aspect of the invention.
【図６】請求項４の発明を電話機に適用した場合のマイ
クの配置例（その１）を示す図。FIG. 6 is a diagram showing an arrangement example (1) of microphones when the invention of claim 4 is applied to a telephone.
【図７】図６に記載の電話機の使用例を説明するための
図。FIG. 7 is a diagram for explaining a usage example of the telephone set shown in FIG.
【図８】請求項４の発明のマイクの配置例（その２）を
示す図。FIG. 8 is a view showing an arrangement example (No. 2) of the microphones of the invention of claim 4;
【図９】請求項４の発明のマイクの配置例（その３）を
示す図。FIG. 9 is a diagram showing an arrangement example (No. 3) of the microphones according to the invention of claim 4;
【図１０】請求項４の発明のマイクの配置例（その４）
を示す図。FIG. 10 is an arrangement example (4) of the microphone of the invention of claim 4;
FIG.
１ マイク ２ 帯域分割手段 ３ 帯域別チャネル間パラメータ値差検出手段 ４ 音源信号判定手段 ５ 音源信号選択手段 ６ 音源信号合成手段 ７ 信号加算手段 1 microphone 2 Band division means 3 Parameter value difference detection means between channels for each band 4 Sound source signal determination means 5 Sound source signal selection means 6 Sound source signal synthesizing means 7 Signal addition means
Claims (4)
に分割する帯域分割手段と、 前記帯域分割手段で分割された各出力チャネル信号の各
同一帯域毎に、前記複数のマイクの位置に起因して変化
する、マイクに到達する音響信号のパラメータの値の差
を、帯域別チャネル間パラメータ値差として検出する帯
域別チャネル間パラメータ値差検出手段と、 前記各帯域の帯域別チャネル間パラメータ値差に基づ
き、その帯域の前記帯域分割された各出力チャネル信号
のいずれがいずれの音源から入力された信号であるかを
判定する音源信号判定手段と、 前記音源信号判定手段の判定に基づき、前記帯域分割さ
れた各出力チャネル信号から、同一音源から入力された
信号を少なくとも一つ選択する音源信号選択手段と、 前記音源信号選択手段で同一音源からの信号として選択
された複数の帯域信号を音源信号として合成する音源信
号合成手段とを有する収音装置において、 前記収音手段は、 複数のマイクを同一直線状、あるいは正三角形に配置す
ることなく、少なくとも１本を、目的音源と前記マイク
との距離が雑音源と前記マイクとの距離に比べて短くな
るように目的音源の近くに配置し、他の少なくとも１本
のマイクを、雑音源と前記マイクとの距離が、目的音源
と前記マイクとの距離に比べて短くなるように雑音源の
近くに配置することを特徴とする収音装置。1. A sound collecting unit including a plurality of microphones, a band dividing unit that divides each output channel signal of the microphone into a plurality of frequency bands, and each output channel signal that is divided by the band dividing unit. Band-by-band parameter value difference detection that detects, as band-by-channel parameter value differences, for each same band, a difference in parameter values of acoustic signals reaching the microphones, which changes due to the positions of the plurality of microphones And a sound source signal determination means for determining which of the sound sources the input signal of each of the band-divided output channels of the band is based on the parameter value difference between channels for each band of the band. And selecting at least one signal input from the same sound source from each of the band-divided output channel signals based on the judgment of the sound source signal judging means. A sound collecting device having a sound source signal selecting means and a sound source signal synthesizing means for synthesizing a plurality of band signals selected as signals from the same sound source by the sound source signal selecting means as a sound source signal, wherein the sound collecting means is Without arranging the microphones in the same straight line or in an equilateral triangle, place at least one microphone near the target sound source so that the distance between the target sound source and the microphone is shorter than the distance between the noise source and the microphone. And another at least one microphone is arranged near the noise source such that the distance between the noise source and the microphone is shorter than the distance between the target sound source and the microphone. Sound device.
２本以上のマイクの出力を加算して前記帯域分割手段へ
供給する信号加算手段を有することを特徴とする収音装
置。2. The sound collecting device according to claim 1, wherein two or more microphones are arranged near the noise source,
A sound collecting device comprising signal adding means for adding outputs of two or more microphones and supplying the result to the band dividing means.
に分割する帯域分割手段と、 前記帯域分割手段で分割された各出力チャネル信号の各
同一帯域毎に、前記複数のマイクの位置に起因して変化
する、マイクに到達する音響信号のパラメータの値の差
を、帯域別チャネル間パラメータ値差として検出する帯
域別チャネル間パラメータ値差検出手段と、 前記各帯域の帯域別チャネル間パラメータ値差に基づ
き、その帯域の前記帯域分割された各出力チャネル信号
のいずれがいずれの音源から入力された信号であるかを
判定する音源信号判定手段と、 前記音源信号判定手段の判定に基づき、前記帯域分割さ
れた各出力チャネル信号から、同一音源から入力された
信号を少なくとも一つ選択する音源信号選択手段と、 前記音源信号選択手段で同一音源からの信号として選択
された複数の帯域信号を音源信号として合成する音源信
号合成手段とを有する収音装置において、 前記収音手段の複数のマイクは、目的音源からの距離を
ほぼ等距離とし、かつ、雑音源との距離を目的音源から
の距離より大きくなるように配置することを特徴とする
収音装置。3. A sound collecting means composed of a plurality of microphones, a band dividing means for dividing each output channel signal of the microphone into a plurality of frequency bands, and each output channel signal divided by the band dividing means. Band-by-band parameter value difference detection that detects, as band-by-channel parameter value differences, for each same band, a difference in parameter values of acoustic signals reaching the microphones, which changes due to the positions of the plurality of microphones And a sound source signal determination means for determining which of the sound sources the input signal of each of the band-divided output channels of the band is based on the parameter value difference between channels for each band of the band. And selecting at least one signal input from the same sound source from each of the band-divided output channel signals based on the judgment of the sound source signal judging means. In a sound collecting device having a sound source signal selecting means and a sound source signal synthesizing means for synthesizing a plurality of band signals selected as signals from the same sound source by the sound source signal selecting means as a sound source signal, a plurality of the sound collecting means are provided. The microphone is arranged so that the distance from the target sound source is substantially equal and the distance from the noise source is larger than the distance from the target sound source.
に分割する帯域分割手段と、 前記帯域分割手段で分割された各出力チャネル信号の各
同一帯域毎に、前記複数のマイクの位置に起因して変化
する、マイクに到達する音響信号のパラメータの値の差
を、帯域別チャネル間パラメータ値差として検出する帯
域別チャネル間パラメータ値差検出手段と、 前記各帯域の帯域別チャネル間パラメータ値差に基づ
き、その帯域の前記帯域分割された各出力チャネル信号
のいずれがいずれの音源から入力された信号であるかを
判定する音源信号判定手段と、 前記音源信号判定手段の判定に基づき、前記帯域分割さ
れた各出力チャネル信号から、同一音源から入力された
信号を少なくとも一つ選択する音源信号選択手段と、 前記音源信号選択手段で同一音源からの信号として選択
された複数の帯域信号を音源信号として合成する音源信
号合成手段とを有する収音装置において、 前記収音手段の複数のマイクを、値βを所望のＳ／Ｎを
得るための閾値とした時、目的音源から各マイクへ到達
する信号の到達時間差、および到達レベル差の絶対値が
値β以上になるように、かつ、雑音源から各マイクへ到
達する信号の到達時間差、および到達レベル差の絶対値
が前記値βより小さくなるように配置することを特徴と
する収音装置。4. A sound collecting means comprising a plurality of microphones, a band dividing means for dividing each output channel signal of the microphone into a plurality of frequency bands, and each output channel signal divided by the band dividing means. Band-by-band parameter value difference detection that detects, as band-by-channel parameter value differences, for each same band, a difference in parameter values of acoustic signals reaching the microphones, which changes due to the positions of the plurality of microphones And a sound source signal determination means for determining which of the sound sources the input signal of each of the band-divided output channels of the band is based on the parameter value difference between channels for each band of the band. And selecting at least one signal input from the same sound source from each of the band-divided output channel signals based on the judgment of the sound source signal judging means. In a sound collecting device having a sound source signal selecting means and a sound source signal synthesizing means for synthesizing a plurality of band signals selected as signals from the same sound source by the sound source signal selecting means as a sound source signal, a plurality of the sound collecting means are provided. When the microphone has a value β as a threshold value for obtaining a desired S / N, the absolute values of the arrival time difference and the arrival level difference of signals that reach each microphone from the target sound source are equal to or more than the value β, and The sound pickup device is arranged such that the absolute values of the arrival time difference and the arrival level difference of the signals reaching the microphones from the noise source are smaller than the value β.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001296418A JP3768853B2 (en) | 2001-09-27 | 2001-09-27 | Sound collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001296418A JP3768853B2 (en) | 2001-09-27 | 2001-09-27 | Sound collector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003111185A true JP2003111185A (en) | 2003-04-11 |
| JP3768853B2 JP3768853B2 (en) | 2006-04-19 |
Family
ID=19117664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001296418A Expired - Fee Related JP3768853B2 (en) | 2001-09-27 | 2001-09-27 | Sound collector |
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| Country | Link |
|---|---|
| JP (1) | JP3768853B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006197552A (en) * | 2004-12-17 | 2006-07-27 | Univ Waseda | Sound source separation system and method, and acoustic signal acquisition device |
| WO2014125860A1 (en) * | 2013-02-12 | 2014-08-21 | 日本電気株式会社 | Speech processing device, speech processing method, speech processing program, attachment method for speech processing device, ceiling member, and vehicle |
| WO2014188735A1 (en) * | 2013-05-23 | 2014-11-27 | 日本電気株式会社 | Sound processing system, sound processing method, sound processing program, vehicle equipped with sound processing system, and microphone installation method |
-
2001
- 2001-09-27 JP JP2001296418A patent/JP3768853B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006197552A (en) * | 2004-12-17 | 2006-07-27 | Univ Waseda | Sound source separation system and method, and acoustic signal acquisition device |
| WO2014125860A1 (en) * | 2013-02-12 | 2014-08-21 | 日本電気株式会社 | Speech processing device, speech processing method, speech processing program, attachment method for speech processing device, ceiling member, and vehicle |
| US9847091B2 (en) | 2013-02-12 | 2017-12-19 | Nec Corporation | Speech processing apparatus, speech processing method, speech processing program, method of attaching speech processing apparatus, ceiling member, and vehicle |
| WO2014188735A1 (en) * | 2013-05-23 | 2014-11-27 | 日本電気株式会社 | Sound processing system, sound processing method, sound processing program, vehicle equipped with sound processing system, and microphone installation method |
| JPWO2014188735A1 (en) * | 2013-05-23 | 2017-02-23 | 日本電気株式会社 | Audio processing system, audio processing method, audio processing program, vehicle equipped with audio processing system, and microphone installation method |
| US9905243B2 (en) | 2013-05-23 | 2018-02-27 | Nec Corporation | Speech processing system, speech processing method, speech processing program, vehicle including speech processing system on board, and microphone placing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3768853B2 (en) | 2006-04-19 |
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