JPS5873217A - Signal input device - Google Patents
Signal input deviceInfo
- Publication number
- JPS5873217A JPS5873217A JP56170833A JP17083381A JPS5873217A JP S5873217 A JPS5873217 A JP S5873217A JP 56170833 A JP56170833 A JP 56170833A JP 17083381 A JP17083381 A JP 17083381A JP S5873217 A JPS5873217 A JP S5873217A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- sound
- output
- signal
- noise
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003321 amplification Effects 0.000 claims abstract description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 12
- 230000005236 sound signal Effects 0.000 claims abstract description 10
- 239000000284 extract Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 8
- 238000009499 grossing Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010183 spectrum analysis Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/32—Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level
Landscapes
- Control Of Amplification And Gain Control (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、信号入力装置に関するもので、騒音等周囲条
件に応じて音声信号の増幅回路をコントロールし、話者
の音声を抽出し認識がおこなえるようにしたものである
。[Detailed Description of the Invention] The present invention relates to a signal input device, which controls an audio signal amplification circuit according to ambient conditions such as noise, and extracts and recognizes the speaker's voice. .
音声信号を検出しようとする場合、話者の周囲の騒音レ
ベルが大きいと、音声入力のためのマイクロホンを通し
て音声とともに騒音も入力され、音声領域の抽出が困難
となる恐れがある。音声と騒音のレベル比をあげるため
に、大声を発声しても周囲の騒音レベルがきわめて高い
場合、やはり音声領域を抽出し得ない場合も生じる欠点
があった。When attempting to detect an audio signal, if the noise level around the speaker is high, noise may be input along with the audio through the microphone for audio input, making it difficult to extract the audio area. Even if a loud voice is uttered to increase the level ratio between voice and noise, if the surrounding noise level is extremely high, the voice region may not be extracted.
また、マイクロホンを話者の口元におき、増幅器の増幅
率を下げて大きめの発声によって音声領域を抽出する方
法においては、マイクロホンの保持を考えねばならず、
話者にマイクロホン保持のための負担を強いることにな
り、使用上の不都合が生じる欠点があった。In addition, in the method of placing a microphone near the speaker's mouth and lowering the amplification factor of the amplifier to extract the voice region by speaking loudly, it is necessary to consider how to hold the microphone.
This has the disadvantage that the speaker is forced to bear the burden of holding the microphone, resulting in inconvenience in use.
本発明は、このような欠点を除去したもので、周囲の騒
音レベルを検出する検出回路に、音声領域検出に影響を
及ばず周波数成分にウェイトをかける回路を設け、その
出力レベル(周辺騒音レベル)によって周辺騒音を含む
話者の音声信号の増幅率を自動制御することにより、騒
音レベルに関係すく、一定のスレシュホルトレベルによ
り音声領域を判別できるようにしたものである。The present invention eliminates these drawbacks by providing a detection circuit for detecting the ambient noise level with a circuit that weights frequency components without affecting audio area detection. ), the amplification factor of the speaker's voice signal including ambient noise is automatically controlled, thereby making it possible to discriminate the voice region based on a constant threshold level, regardless of the noise level.
以下、図面を用いてその一実施例を説明する。One embodiment will be described below with reference to the drawings.
第1図において、1は音声検出用のマイクロホン、1′
は騒音検出用のマイクロホン、2はマイクロホン1で検
出した音声信号(周囲の騒音信号も含む)を増幅する前
置増幅器、2′はマイクロホン1′で検出した騒音信号
を増幅する前置増幅器、3は音声領域検出に影響を及ぼ
す周波数成分にウェイトをかける回路で、例えば帯域通
過フィルタ等で構成する。3′は音声領域検出に影響を
及ぼす周波数領域以外の周波数成分にウェイトをかける
主としてノイズ部分だけの信号を取り出す回°路であり
、例えば帯域遮断フィルタが用いられる。4は回路3′
の出力を平滑化し、レベル化する平滑回路である。In Fig. 1, 1 is a microphone for voice detection, 1'
is a microphone for noise detection; 2 is a preamplifier that amplifies the audio signal (including ambient noise signals) detected by microphone 1; 2' is a preamplifier that amplifies the noise signal detected by microphone 1'; is a circuit that weights frequency components that affect audio region detection, and is composed of, for example, a band-pass filter. Reference numeral 3' denotes a circuit for extracting a signal mainly consisting of a noise portion, which weights frequency components other than the frequency region that affects voice region detection, and uses, for example, a band-cut filter. 4 is circuit 3'
This is a smoothing circuit that smoothes the output and levels it.
5は平滑回路4の出力に応じて増幅率が変化する増幅回
路であり、帯域通過フィルタ3の出力信号は、平滑回路
4の出力レベルに応じた増幅率で増幅される。即ち、増
幅回路5は、平滑回路4の出力レベルL4が大きい時は
、周辺騒音レベルが高いので音声帯域信号の増幅率を押
え、L4が小さい時はその増幅率を上げるような制御を
行なう増幅回路である。6は増幅回路5で増幅された信
号L5を処理する信号処理回路で、ある一定のスレシュ
ホルトレベルLTと比較して、L5>LTの場合は音声
領域と判定する信号処理回路である。このスレシュホル
ト9レベルLTは一定でよい。Ji[音レベルが低い場
合は、問題なく音声領域(第2図の201の区間、第3
図の301の区間)が判定できるのは当然であるが、周
辺騒音レベルが高い場合にも、増幅回路50出カは、平
滑回路4の騒音レベルで制御され、周辺騒音を含む音声
信号全体のレベルを第3図のように下げることになる。Reference numeral 5 denotes an amplifier circuit whose amplification factor changes according to the output of the smoothing circuit 4, and the output signal of the bandpass filter 3 is amplified with an amplification factor corresponding to the output level of the smoothing circuit 4. That is, when the output level L4 of the smoothing circuit 4 is high, the amplification circuit 5 suppresses the amplification factor of the voice band signal because the ambient noise level is high, and when L4 is small, the amplification factor is increased. It is a circuit. Reference numeral 6 denotes a signal processing circuit that processes the signal L5 amplified by the amplifier circuit 5, and compares it with a certain threshold level LT and determines that the signal is in the audio region if L5>LT. This threshold 9 level LT may be constant. Ji [If the sound level is low, the audio area (section 201 in Figure 2,
It is natural that the section 301 in the figure) can be determined, but even when the ambient noise level is high, the output of the amplifier circuit 50 is controlled by the noise level of the smoothing circuit 4, and the output of the amplifier circuit 50 is controlled by the noise level of the smoothing circuit 4. The level will be lowered as shown in Figure 3.
第2図は従来の音声入力装置における増幅回路の出力波
形を示している。従来の装置では増幅回路の増幅率が一
定であったため、音声領域を判別する時、スレシュホル
トレベルL、を固定した場合に、周辺騒音l/ベルの低
い時の音声領域(2010区間)の判定は正しくできる
が、騒音レベルの高い時の音声領域は、区間202であ
るのに、区間203と間違えるものであった。FIG. 2 shows an output waveform of an amplifier circuit in a conventional audio input device. In conventional devices, the amplification factor of the amplifier circuit was constant, so when determining the audio region, if the threshold level L was fixed, it was difficult to determine the audio region (2010 section) when the ambient noise l/bell was low. was correct, but when the noise level was high, the audio region was in section 202, but it was mistaken for section 203.
これに対して本発明では、騒音レベルに応じて増幅回路
の増加率を変化させるため増幅回路の出力波形は第3図
に示すようになり、周辺の騒音レベルの高い場合も30
2のように、はぼ正しく音声領域を判別できるものであ
る。On the other hand, in the present invention, since the increase rate of the amplifier circuit is changed according to the noise level, the output waveform of the amplifier circuit becomes as shown in FIG.
As shown in item 2, the voice area can be determined fairly accurately.
コノように周囲騒音レベルの大小にかかわらず、第1図
の信号処理回路6で音声領域と判定された音声信号は、
例えば帯域通過フィルタ群によるアナログ的寿ス4クト
ル分析のフィルタバンク7を通して周波数毎の出カッR
ターンを作成し、判定回路8にあらかじめ登録されてい
る音声Aターンと、例えば・ぐターンマツチングを行な
って判定する。Regardless of the magnitude of the ambient noise level, the audio signal determined to be in the audio area by the signal processing circuit 6 in FIG.
For example, the output R for each frequency is output through the filter bank 7 of an analog frequency spectrum analysis using a group of bandpass filters.
A turn is created and determined by performing, for example, turn matching with the voice A turn previously registered in the determination circuit 8.
9は判定結果である。9 is the determination result.
以上のように本発明によれば、音声信号の周波数成分以
外の周波数領域の信号レベルにより、周辺騒音を含む音
声信号のrインを自動調整し、最適値に保つため、周囲
騒音に影響されることなく、捷たスレシーホルトを変化
させることなく、正しく音声を入力することができる。As described above, according to the present invention, the r-in of an audio signal including ambient noise is automatically adjusted based on the signal level of a frequency domain other than the frequency components of the audio signal, and is kept at an optimal value. It is possible to input voice correctly without changing the distorted threshold.
更に音声入力の為のマイクロホンを口元に近づけなくて
もよく、使用」−不都合がない利点を有するものである
。なオ、装置のコス) tjフオーマンスを上げるため
、マイクロホン1と1′、及び前置増幅回路2と2′は
別に分けなくてもよく、また帯域通、lA:Iフィルタ
3を省略することも可能である。これらの処理はアナロ
グ的にもディノタル的にも処理することも可能である。Furthermore, it has the advantage that the microphone for voice input does not have to be brought close to the mouth, so there is no inconvenience in using it. In order to improve TJ performance, the microphones 1 and 1' and the preamplifier circuits 2 and 2' do not need to be separated, and the bandpass and lA:I filters 3 can be omitted. It is possible. These processes can be performed in both analog and digital ways.
本発明は特に騒音のある場所で、音声認識を行なう場合
に有効であるThe present invention is particularly effective for voice recognition in noisy places.
第1図は本発明の一実施例における信号入力装置のブロ
ック図、第2図は従来の信号入力装置の増幅器の出力波
形図、第3図は本発明装置の増幅器の出力波形図である
。
1.1′・・マイクロホン、2.2’・・前置増幅器、
3・帯域通過フィルタ、3′・・・帯域遮断フィルタ、
4・平滑回路、5・・・増幅器、6・信号処理回路、7
・・フィルタパンク、8・・・判定回路、9・・判定結
果・FIG. 1 is a block diagram of a signal input device according to an embodiment of the present invention, FIG. 2 is an output waveform diagram of the amplifier of the conventional signal input device, and FIG. 3 is an output waveform diagram of the amplifier of the device of the present invention. 1.1'...microphone, 2.2'...preamplifier,
3.Band pass filter, 3'...Band cut filter,
4. Smoothing circuit, 5... Amplifier, 6. Signal processing circuit, 7
...Filter puncture, 8. Judgment circuit, 9. Judgment result.
Claims (1)
音声領域外の騒音のレベルを検出しこの騒音レベルに応
じて上記増幅器の増幅率を変化させる制御回路と、上記
増幅器の出力の一定レベル以上を抽出する回路とを有し
、この゛回路の出力を音声入力信号とすることを特徴と
する信号入力装置。an amplifier with a variable amplification factor that amplifies audio signals including noise;
It has a control circuit that detects the level of noise outside the audio range and changes the amplification factor of the amplifier according to this noise level, and a circuit that extracts the output of the amplifier above a certain level, and the output of this circuit. A signal input device characterized in that it uses as an audio input signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56170833A JPS5873217A (en) | 1981-10-27 | 1981-10-27 | Signal input device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56170833A JPS5873217A (en) | 1981-10-27 | 1981-10-27 | Signal input device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5873217A true JPS5873217A (en) | 1983-05-02 |
JPS6367199B2 JPS6367199B2 (en) | 1988-12-23 |
Family
ID=15912172
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56170833A Granted JPS5873217A (en) | 1981-10-27 | 1981-10-27 | Signal input device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5873217A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61170800A (en) * | 1985-01-25 | 1986-08-01 | ロ−ム株式会社 | Voice identification circuit |
JP2012016039A (en) * | 2000-04-14 | 2012-01-19 | Harman Internatl Industries Inc | Method and apparatus for dynamic sound optimization |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04347293A (en) * | 1991-05-23 | 1992-12-02 | Yoshida Kogyo Kk <Ykk> | Obstruction sensor for shutter |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5162604A (en) * | 1974-11-28 | 1976-05-31 | Fujitsu Ltd | Onseinyuryokusochi |
JPS52120534U (en) * | 1976-03-03 | 1977-09-13 | ||
JPS5443637U (en) * | 1977-09-01 | 1979-03-26 | ||
JPS5491007A (en) * | 1977-12-28 | 1979-07-19 | Nec Corp | Audio recognition unit |
JPS57158700A (en) * | 1981-03-25 | 1982-09-30 | Nissan Motor | Voice recognition unit for vehicle |
-
1981
- 1981-10-27 JP JP56170833A patent/JPS5873217A/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5162604A (en) * | 1974-11-28 | 1976-05-31 | Fujitsu Ltd | Onseinyuryokusochi |
JPS52120534U (en) * | 1976-03-03 | 1977-09-13 | ||
JPS5443637U (en) * | 1977-09-01 | 1979-03-26 | ||
JPS5491007A (en) * | 1977-12-28 | 1979-07-19 | Nec Corp | Audio recognition unit |
JPS57158700A (en) * | 1981-03-25 | 1982-09-30 | Nissan Motor | Voice recognition unit for vehicle |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61170800A (en) * | 1985-01-25 | 1986-08-01 | ロ−ム株式会社 | Voice identification circuit |
JP2012016039A (en) * | 2000-04-14 | 2012-01-19 | Harman Internatl Industries Inc | Method and apparatus for dynamic sound optimization |
Also Published As
Publication number | Publication date |
---|---|
JPS6367199B2 (en) | 1988-12-23 |
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