JPS607848B2 - automatic volume adjustment device - Google Patents
automatic volume adjustment deviceInfo
- Publication number
- JPS607848B2 JPS607848B2 JP10301478A JP10301478A JPS607848B2 JP S607848 B2 JPS607848 B2 JP S607848B2 JP 10301478 A JP10301478 A JP 10301478A JP 10301478 A JP10301478 A JP 10301478A JP S607848 B2 JPS607848 B2 JP S607848B2
- Authority
- JP
- Japan
- Prior art keywords
- noise
- output
- adjustment device
- volume adjustment
- sound
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- 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
Description
【発明の詳細な説明】
本発明は高騒音下において明瞭な音量となる様周囲の騒
音に応じて音量を自動的に調整する装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that automatically adjusts the volume according to surrounding noise so that the volume is clear even under high noise conditions.
従来この様な装置においては第１図のように音声と騒音
の識別が困難であるため音声とスピーカから放出された
（音声＋騒音）との差をとり騒音のみを取出す方式を用
いるものが多い。Conventionally, in such devices, as shown in Figure 1, it is difficult to distinguish between sound and noise, so many systems use a method that takes the difference between the sound and the (sound + noise) emitted from the speaker and extracts only the noise. .
第１図はその一例で、１は音源、２は制御増幅器、３，
４はアンプ、５はスピーカ、６は集音用のマイクロホン
、７，８は整流器、９はコンパレータである。しかしこ
の方式は回路の感度調整が微妙であり又騒音及びスピー
カ出力レベルの大きさによりこの感度がノンリニアにな
り正しい音量調整が成されない。一般に事務所、町中等
に存在する騒音はホスノィズ的なものが王である。Figure 1 is an example of this, where 1 is a sound source, 2 is a control amplifier, 3,
4 is an amplifier, 5 is a speaker, 6 is a microphone for collecting sound, 7 and 8 are rectifiers, and 9 is a comparator. However, in this method, the sensitivity adjustment of the circuit is delicate, and the sensitivity becomes non-linear due to the magnitude of the noise and speaker output level, making it impossible to adjust the volume correctly. In general, the noise that exists in offices, towns, etc. is dominated by phosnoise.
又、そのスペクトルとは多少傾斜が異なるが自動車内騒
音も前者の一種である。Furthermore, although the slope of the spectrum is somewhat different, noise inside a car is also a type of the former type.
これらの騒音のスペクトルは、ある帯域に注目して見る
と、時間的に見ればあまり急激な変動はない。一方音声
等のスペクトルは時間的に見るとかなり激しく変動して
いる。本発明は、上記の性質に注目し、スピーカから放
出された音源を含む騒音のスペクトルを複数個のバンド
パスフイルタにより抽出し、それぞれのフィルタ出力レ
ベルの中で最も小さいレベルのものを時々刻々選ぶこと
によりその帯城には音源からの成分は含まないと見なし
、それが騒音レベルであるとしそれによって音量を制御
しようとするものである。When looking at the spectra of these noises by focusing on a certain band, there are not very rapid fluctuations over time. On the other hand, the spectrum of speech and the like fluctuates considerably over time. The present invention focuses on the above-mentioned properties, extracts the noise spectrum including the sound source emitted from the speaker using a plurality of bandpass filters, and selects the lowest level among the filter output levels from time to time. Therefore, it is assumed that the band does not include components from the sound source, and it is assumed that this is the noise level, and the volume is controlled accordingly.
第２図はその原理図である。FIG. 2 is a diagram showing its principle.
ある時刻における騒音のスペクトルはイ第２図ａのよう
になる。これを同図ｂの口のようなＦ特補正回路を通す
ことによりスペクトルは同図ｃのハのようになる。ここ
で動作の一例としてスピーカからの出力の音源のスペク
トルを同図ｄの二とすると補正回路出力の信号はホのよ
うになる。すなわち木の補正回路出力は騒音レベルに音
源のスペクトルが加わった形になっている。The noise spectrum at a certain time is as shown in Figure 2a. By passing this through an F characteristic correction circuit like the one shown in FIG. 2B, the spectrum becomes as shown in FIG. Here, as an example of operation, if the spectrum of the sound source output from the speaker is 2 in d in the same figure, the signal output from the correction circuit will be as shown in e. In other words, the output of the tree correction circuit is the sound level plus the spectrum of the sound source.
従ってｆ，〜ｆ９のスペクトルレベルをみて最小値であ
るらのレベルを騒音レベルとみなすことができ、これを
もとに音量を自動的にコントロールすれば、騒音により
音量をコントロールしたことになる。Therefore, looking at the spectral levels of f, to f9, the minimum level can be regarded as the noise level, and if the volume is automatically controlled based on this, the volume is controlled by the noise.
第３図は本発明の一実施例を示す。FIG. 3 shows an embodiment of the invention.
先づマイクロホン１１で収音された音源＋騒音の合成波
形は補正回路１２でスペクトル煩斜補正され、ｆ，〜ｆ
ｎの各フィルター１ ３〔１ ３ １，１３２・・・・
・・〕で周波数分析される。First, the composite waveform of the sound source + noise picked up by the microphone 11 is subjected to spectral tilt correction in the correction circuit 12, and then f, ~f
Each filter of n 1 3 [1 3 1,132...
...] is used for frequency analysis.
その後選択回路１４により各フィルター１３出力の最４
・値のものを選び整流回路１５により直流（ＤＣ）電圧
に変換される。騒音の急激な変動によりこの電圧が変動
しない様時定数回路１６を挿入する。この世力電圧を制
御電圧とし制御増幅器１７をコントロールすると、所定
のレベルの出力がアンプ１９、スピーカ２０を通して得
られる。このように構成することにより、音量は音源１
８の大きさによらず、常に騒音レベルのみを検出し騒音
レベルに対応したレベルが得られ、いかなる騒音下にお
いても明瞭な音が聞ける様自動的に調整される。以上の
ように本発明によれば、簡単な構成で、音声と騒音とが
混在する音場における騒音レベルのみを自動的に確実に
検出して音量を制御することができ、騒音によっても明
瞭度のすぐれた音声出力を得ることができる。After that, the selection circuit 14 selects the four outputs of each filter 13.
- A value is selected and converted into a direct current (DC) voltage by the rectifier circuit 15. A time constant circuit 16 is inserted so that this voltage does not fluctuate due to sudden fluctuations in noise. When the control amplifier 17 is controlled using this world voltage as a control voltage, an output at a predetermined level is obtained through the amplifier 19 and the speaker 20. By configuring this way, the volume is adjusted to the sound source 1.
8, it always detects only the noise level, obtains a level corresponding to the noise level, and automatically adjusts so that clear sound can be heard even under any noise. As described above, according to the present invention, with a simple configuration, it is possible to automatically and reliably detect only the noise level in a sound field where speech and noise are mixed, and control the volume. You can get excellent audio output.
第１図は従釆の自動音量調整装置のブロック図、第２図
ａ〜ｄは本発明の原理図、第３図は本発明の一実施例に
おける自動音量調整装置のブロック図である。
１１…・・・マイクロホン、１２・・・・・・補正回路
、１３・・・・・・フィルター、１４……選択回路、１
５・・・・・・整流回路、１６…・・・時定数回路、１
７・・・・・・制御増中器、１９……アンプ、２０……
スピーカ。
第１図第２図
第３図FIG. 1 is a block diagram of a subordinate automatic volume adjustment device, FIGS. 2a to 2d are diagrams of the principle of the present invention, and FIG. 3 is a block diagram of an automatic volume adjustment device in an embodiment of the present invention. 11...Microphone, 12...Correction circuit, 13...Filter, 14...Selection circuit, 1
5... Rectifier circuit, 16... Time constant circuit, 1
7...Control multiplier, 19...Amplifier, 20...
speaker. Figure 1 Figure 2 Figure 3
Claims (1)
に分け、各周波数帯域レベルを出力する複数個のフイル
タと、上記複数個のフイルタの出力の内の最小の出力を
選択する選択回路と、選択されたフイルタ出力を直流電
圧に変換する整流回路と、音源からの信号を増幅する制
御増幅器と、この制御増幅器の出力を音に変換するスピ
ーカとを具備し、上記整流回路の出力により上記制御増
幅器の利得を制御することを特徴とする自動音量調整装
置。1. A plurality of filters that divide a signal picked up by a microphone into a plurality of frequency bands and output the level of each frequency band, a selection circuit that selects the minimum output from among the outputs of the plurality of filters, and a selection circuit. The control amplifier includes a rectifier circuit that converts the output of the filter into a DC voltage, a control amplifier that amplifies the signal from the sound source, and a speaker that converts the output of the control amplifier into sound. An automatic volume adjustment device characterized by controlling the gain of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10301478A JPS607848B2 (en) | 1978-08-23 | 1978-08-23 | automatic volume adjustment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10301478A JPS607848B2 (en) | 1978-08-23 | 1978-08-23 | automatic volume adjustment device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5528681A JPS5528681A (en) | 1980-02-29 |
| JPS607848B2 true JPS607848B2 (en) | 1985-02-27 |
Family
ID=14342781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10301478A Expired JPS607848B2 (en) | 1978-08-23 | 1978-08-23 | automatic volume adjustment device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS607848B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6331683A (en) * | 1986-07-21 | 1988-02-10 | リンクス・ゴルフ・インコ−ポレ−テッド | Composite golf club iron head |
| JPH05168732A (en) * | 1991-12-19 | 1993-07-02 | Bridgestone Corp | Golf club head |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS583305A (en) * | 1981-06-29 | 1983-01-10 | Hitachi Ltd | Automatic sound volume adjusting circuit |
| JPH0644698B2 (en) * | 1984-07-02 | 1994-06-08 | 日産自動車株式会社 | Audio equipment |
| JPH0744415B2 (en) * | 1984-10-11 | 1995-05-15 | 日産自動車株式会社 | Vehicle audio system |
| JP2007500466A (en) * | 2003-07-28 | 2007-01-11 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Audio adjustment apparatus, method, and computer program |
| CN100464498C (en) * | 2006-11-29 | 2009-02-25 | 北京中星微电子有限公司 | A method and device for implementing adjustment of volume based on environmental noise detection |
-
1978
- 1978-08-23 JP JP10301478A patent/JPS607848B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6331683A (en) * | 1986-07-21 | 1988-02-10 | リンクス・ゴルフ・インコ−ポレ−テッド | Composite golf club iron head |
| JPH05168732A (en) * | 1991-12-19 | 1993-07-02 | Bridgestone Corp | Golf club head |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5528681A (en) | 1980-02-29 |
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