JPH02279134A - Detection of change in sound quality by brain wave measurement - Google Patents
Detection of change in sound quality by brain wave measurementInfo
- Publication number
- JPH02279134A JPH02279134A JP1100319A JP10031989A JPH02279134A JP H02279134 A JPH02279134 A JP H02279134A JP 1100319 A JP1100319 A JP 1100319A JP 10031989 A JP10031989 A JP 10031989A JP H02279134 A JPH02279134 A JP H02279134A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency band
- low
- sound quality
- passed
- 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
Landscapes
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は、音質変化検知実験に使用して聴取者における
脳波の周波数分布の変化を検知し得る周波数の音を忠実
に発生する音響装置を使用した脳波計測による音質変化
検知方式に関する。[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention is used in sound quality change detection experiments to faithfully generate sounds at frequencies that can detect changes in the frequency distribution of brain waves in a listener. This paper relates to a method for detecting changes in sound quality by measuring electroencephalograms using a sound generating device.
（従来の技術）
いわゆる人間の可聴域上限とされている２０ｋＨｚを上
回る高域音に対する人間の感受性を検討するにあたり、
従来第５図に示すような音響装置を使用した音質変化検
知実験が行われてきた。この従来の音響装置は、可聴周
波帯域である低周波帯域および可聴周波帯域を越える高
周波帯域の音楽等を発生する例えばテープレコーダ等か
らなる音源１を有し、この音源１から発生する音楽等を
スイッチ２１で切り替えて、ローパスフィルタ２３また
はオールバスフィルタ２５を通過させ、これらのフィル
タの出力をプリアンプ２７およびパワーアンプ２９で増
幅し、ネットワーク３１および減衰器３３を介してスピ
ーカ３５およびツイータ３７から聴取者に聴かせるよう
になっている。(Prior art) When considering human sensitivity to high-frequency sounds exceeding 20 kHz, which is considered to be the upper limit of the human audible range,
Conventionally, experiments for detecting changes in sound quality have been conducted using an acoustic device as shown in FIG. This conventional audio device has a sound source 1, such as a tape recorder, which generates music in a low frequency band that is an audio frequency band and a high frequency band that exceeds the audio frequency band. Switch 21 switches to pass the low-pass filter 23 or all-bus filter 25, the outputs of these filters are amplified by the preamplifier 27 and power amplifier 29, and are heard from the speaker 35 and tweeter 37 via the network 31 and attenuator 33. It is designed for people to listen to.
そして、このように構成されたものにおいて、スイッチ
２１によってフィルタ２３．２５を切り換えて、聴取者
に低周波帯域のみの音楽等を聴かせたり、低周波帯域に
加えて高周波帯域の音楽等も聴かせて、その音質の変化
が聴取者に検知できるかどうか、質問と回答という形式
の心理学的実験方法をとっていた。In the device configured in this way, the filters 23 and 25 can be switched using the switch 21 to allow the listener to listen to music in the low frequency band only, or to allow the listener to listen to music in the high frequency band in addition to the low frequency band. Furthermore, he conducted a question-and-answer psychological experiment to determine whether listeners could detect changes in sound quality.
（発明が解決しようとする課題）
まず、上述した従来の音響装置では、可聴周波帯域内の
電気信号がローパスフィルタ２３を通過した時とオール
バスフィルタ２５を通過した時とで別の回路を通過する
ことになるため、両回路の可聴周波帯域における微妙な
特性の差が音質に影響を及ぼし、適確な一測定を行うこ
とができないという問題がある。具体的に説明すると、
例えば、近年においては電子回路よりもはるかに単純な
オーディオケーブルの材質の違いによる音質の差さえも
問題になる状況から見て、上述した電子回路の違いは大
きな問題である。(Problems to be Solved by the Invention) First, in the conventional audio device described above, an electrical signal in the audio frequency band passes through different circuits when it passes through the low-pass filter 23 and when it passes through the all-bus filter 25. Therefore, there is a problem in that the slight difference in characteristics between the two circuits in the audio frequency band affects the sound quality, making it impossible to perform accurate measurements. To explain specifically,
For example, in recent years, differences in sound quality due to differences in the materials of audio cables, which are much simpler than electronic circuits, have become a problem, so the above-mentioned differences in electronic circuits are a big problem.
また、アンプからスピーカにかけての再生装置系におい
てオールパスフィルタ通過時とローパスフィルタ通過時
とでは系を通過する信号成分が大幅に異なるため、オー
ルパスフィルタ通過時により多くの混変調歪が発生する
ことによる可聴周波帯域におけ・る音質変化が発生する
という問題がある。In addition, in the playback system from the amplifier to the speaker, the signal components that pass through the system are significantly different when passing through the all-pass filter and when passing through the low-pass filter, so more cross-modulation distortion occurs when passing through the all-pass filter, resulting in audible distortion. There is a problem in that sound quality changes occur in the frequency band.
さらに、従来の音響装置を使った心理学的手法では、聴
取者の言語・意識が介入し、不安定性が高く、信頼性に
欠けるという問題がある。Furthermore, conventional psychological methods using acoustic devices involve the listener's language and consciousness, resulting in high instability and lack of reliability.
本発明は、上記に鑑みてなされたもので、その目的とす
るところは、上述した従来の問題を除去するために、周
波数帯域の切り替えを行っても回路に影響されず常に適
確な信号を発生し、脳波の適確な測定に使用し得る音響
装置を使用することにより、言語・意識などの聴取者の
主観的判断を排除し、その結果の安定性、信頼性を向上
させる脳波計測による音質変化検知方式を提供すること
にある。The present invention has been made in view of the above, and its purpose is to eliminate the above-mentioned conventional problems by constantly providing an accurate signal without being affected by the circuit even when frequency bands are switched. By using an acoustic device that can be used to accurately measure brain waves, electroencephalogram measurement eliminates the listener's subjective judgment of language, consciousness, etc., and improves the stability and reliability of the results. The object of the present invention is to provide a method for detecting changes in sound quality.
（課題を解決するための手段）
上記目的を達成するため、本発明は、可聴周波帯域およ
び可聴周波帯域を越える周波数帯域の音楽等に係る信号
を発生する信号発生手段と、該信号発生手段から発生す
る信号のうち低周波帯域の信号を通過させる低域通過手
段と、前記信号発生手段から発生する信号のうち前記低
周波帯域を除去した高域周波帯域の信号を選択的に通過
させる高域通過手段と、前記低域通過手段を通過した低
周波信号を増幅して出力する低域出力手段と、前記高域
通過手段を通過した高周波信号を増幅して出力する高域
出力手段とを有する構成の音響装置を使用して、高周波
信号に対する聴取者の脳波に基づき音質変化の検知状況
を判断することを要旨とする。(Means for Solving the Problem) In order to achieve the above object, the present invention provides a signal generating means for generating a signal related to music, etc. in an audio frequency band and a frequency band exceeding the audio frequency band, and A low-pass means for passing a low-frequency band signal among the generated signals, and a high-pass means for selectively passing a high-frequency band signal from which the low frequency band has been removed from among the signals generated by the signal generating means. It has a passing means, a low-frequency output means that amplifies and outputs the low-frequency signal that has passed through the low-pass means, and a high-frequency output means that amplifies and outputs the high-frequency signal that has passed through the high-pass means. The purpose of this research is to use an acoustic device of the following configuration to determine the detection status of a change in sound quality based on the listener's brain waves in response to a high-frequency signal.
（作用）
本発明の脳波計Δ−１による音質変化検知方式では、低
域通過手段を通過した低周波帯域の信号を同じ経路を介
して常に出力するとともに、高域通過手段を通過した高
域周波帯域の信号を前記低周波帯域の信号に加えて選択
的に出力することができる音響装置を使用して、聴取者
の脳波を計測することによって、音質変化の検知を客観
的に確認することができる。(Function) In the sound quality change detection method using the electroencephalogram Δ-1 of the present invention, the low-frequency band signal that has passed through the low-pass means is always outputted via the same route, and the high-frequency band signal that has passed through the high-pass means is always outputted. To objectively confirm the detection of a change in sound quality by measuring the listener's brain waves using an acoustic device that can selectively output a frequency band signal in addition to the low frequency band signal. I can do it.
（実施例） 以下、図面を用いて本発明の詳細な説明する。(Example) Hereinafter, the present invention will be explained in detail using the drawings.
第１図は本発明の一実施例に係わる音響装置の回路構成
を示すブロック図である。同図に示す音響装置は、可聴
周波帯域である低周波帯域および可聴周波帯域を越える
高周波帯域の音楽等の信号を発生する例えばテープレコ
ーダ等からなる音源１を有し、この音源１から発生する
信号をプリアンプ３を介して増幅した後、直接ローパス
フィルタ５を通過させるとともに、またスイッチ７を介
して選択的にバイパスフィルタ９を通過させている。ロ
ーパスフィルタ５を通過した低周波帯域の信号は、パワ
ーアンプ１１で増幅されてから、ネットワーク１５を介
してスピーカ１７から出力されるとともに、更にネット
ワーク１５から減衰器２１を介してツイータ１９から出
力されている。FIG. 1 is a block diagram showing the circuit configuration of an audio device according to an embodiment of the present invention. The audio device shown in the figure has a sound source 1 consisting of, for example, a tape recorder, which generates signals such as music in a low frequency band that is an audio frequency band and a high frequency band that exceeds the audio frequency band. After the signal is amplified via a preamplifier 3, it is directly passed through a low-pass filter 5 and selectively passed through a bypass filter 9 via a switch 7. The low-frequency band signal that has passed through the low-pass filter 5 is amplified by the power amplifier 11 and then output from the speaker 17 via the network 15, and further output from the tweeter 19 via the attenuator 21 from the network 15. ing.
また、スイッチ７を介してバイパスフィルタ９を選択的
に通過した高周波帯域の信号は、パワーアンプ１３で増
幅されてから、ツイータ２３から出力されている。なお
、前記ローパスフィルタ５およびバイパスフィルタ９は
、それぞれ第２図において曲線ＡおよびＢで示すような
特性を有するものである。Further, the high frequency band signal that has selectively passed through the bypass filter 9 via the switch 7 is amplified by the power amplifier 13 and then output from the tweeter 23. The low-pass filter 5 and the bypass filter 9 have characteristics as shown by curves A and B in FIG. 2, respectively.
以上のように構成される音響装置は、スイッチ７をオフ
にした状態においては、音源１からの信号はその低周波
帯域の信号のみがプリアンプ３からローパスフィルタ５
を介し、更にローパスフィルタ５からパワーアンプ１１
、ネットワーク１５、減衰器２１等を介してスピーカ１
７およびスピーカ１７から出力されるが、スイッチ７を
オンにした状態においては、音源１からの信号はその低
周波帯域の信号がプリアンプ３からローパスフィルタ５
を介して上述したようにスピーカ１７およびツイータ１
９から出力されることに加えて、音源１からの信号の高
周波帯域の信号がプリアンプ３で増幅された後、スイッ
チ７を介してバイパスフィルタ９を通過し、このバイパ
スフィルタ９を通過した高周波帯域の信号がパワーアン
プ１３を介してツイータ２３から出力され、これにより
低周波帯域の信号および高周波帯域の信号の両方が同時
に出力されるようになっている。In the acoustic device configured as described above, when the switch 7 is turned off, only the signal in the low frequency band from the sound source 1 is transmitted from the preamplifier 3 to the low-pass filter 5.
and further from the low-pass filter 5 to the power amplifier 11
, the speaker 1 via the network 15, the attenuator 21, etc.
7 and the speaker 17, but when the switch 7 is turned on, the signal from the sound source 1 is transmitted from the preamplifier 3 to the low-pass filter 5.
via the speaker 17 and tweeter 1 as described above.
In addition to being output from 9, the high-frequency band signal from the sound source 1 is amplified by the preamplifier 3, and then passes through the bypass filter 9 via the switch 7, and the high-frequency band signal that has passed through the bypass filter 9 is is output from the tweeter 23 via the power amplifier 13, so that both the low frequency band signal and the high frequency band signal are output simultaneously.
そして、この場合、低周波帯域の信号は音源１からプリ
アンプ３、ローパスフィルタ５、パワーアンプ１１、ネ
ットワーク１５、減衰器２１、スピーカ１７およびツイ
ータ１９という常に同じ経路を通過するとともに、高周
波帯域の信号も同様に音源１からプリアンプ３、スイッ
チ７、バイパスフィルタ９、パワーアンプ１３、ツイー
タ２３という常に同じ独立した経路を通過しているので
、従来のような低周波帯域の信号の音質に影響が生ずる
こともないし、また再生装置系を通過する信号成分が異
なることもなく、従って低周波帯域における音質変化も
発生することがなく、高周波帯域の信号による脳波の変
化の適確な測定に使用することができるようになってい
る。In this case, the signal in the low frequency band always passes through the same path from the sound source 1 to the preamplifier 3, the low-pass filter 5, the power amplifier 11, the network 15, the attenuator 21, the speaker 17, and the tweeter 19, and the signal in the high frequency band Similarly, since the signal always passes through the same independent path from the sound source 1 to the preamplifier 3, switch 7, bypass filter 9, power amplifier 13, and tweeter 23, the sound quality of the signal in the low frequency band as in the conventional case is affected. Furthermore, the signal components passing through the playback system do not differ, and therefore, no change in sound quality occurs in the low frequency band, and it can be used to accurately measure changes in brain waves due to signals in the high frequency band. is now possible.
第３図は第１図に示す音響装置を使用して低周波帯域の
信号のみを聴取者に聴かせたり、または該低周波帯域の
信号に加えて高周波帯域の信号も聴取者に知らせること
なく聴かせて、聴取者の脳波の変化をｎ１定した場合の
測定法の概要を示す構成図である。同図においては、第
１図の音響装置のスピーカ１７およびツイータ１９，２
３を聴取者の前方に設置して、これらのスピーカおよび
ツイータから発生する音を聴取者に聴かせた場合におけ
る聴取者の脳波をＥＥＧ送信機４１で検知して送信し、
これをＥＥＧ受信機４３で受信して記録するように構成
している。Figure 3 shows how the audio equipment shown in Figure 1 is used to make the listener hear only the low frequency band signal, or without informing the listener of the high frequency band signal in addition to the low frequency band signal. FIG. 2 is a configuration diagram showing an outline of a measurement method when a change in brain waves of a listener is determined by n1. In the same figure, the speaker 17 and tweeters 19, 2 of the acoustic device of FIG.
3 is placed in front of the listener, and when the listener is allowed to listen to the sounds generated from these speakers and tweeters, the EEG transmitter 41 detects and transmits the brain waves of the listener,
The EEG receiver 43 is configured to receive and record this.
第４図は第３図に示すＤＩ定法を使用して、３人の被試
験者１，２．３に対してローパスフィルタ５のみを通過
した低周波帯域の信号のみを聴かせた場合およびローパ
スフィルタ５にバイパスフィルタ９を加えて低周波帯域
および高周波帯域の両信号を聴かせた場合にｎ」定した
聴取者の脳波の周波数分布の時間平均値を示す図である
。同図からよくわかるように、低周波帯域の信号のみを
聴かせた場合に比較して、低周波帯域の信号に加えて高
周波帯域の信号も聴かせた場合には、脳波の周波数分布
に明瞭な差異が検出され、この場合は８〜１３１１ｚの
α波帯域が増加していることがわかる。Figure 4 shows the case where three test subjects 1, 2.3 are made to listen to only the low frequency band signal that has passed only the low pass filter 5 and the low pass filter using the DI method shown in Figure 3. FIG. 9 is a diagram showing the time average value of the frequency distribution of the listener's brain waves, determined by n, when a bypass filter 9 is added to the filter 5 and the listener is allowed to listen to signals in both a low frequency band and a high frequency band. As can be clearly seen from the figure, the frequency distribution of brain waves becomes clearer when listening to high-frequency signals in addition to low-frequency signals, compared to when listening only to low-frequency signals. It can be seen that a significant difference is detected, and in this case, the alpha wave band from 8 to 1311z has increased.
以上説明したように、本発明によれば、低域通過手段を
通過した低周波帯域の信号を同じ経路を介して常に出力
するとともに、高域通過手段を通過した高域周波帯域の
信号を前記低周波帯域の信号に加えて選択的に出力する
ことができるので、高周波帯域の信号を出力する時に低
周波帯域の信号が別の経路を通過することなく常に同じ
独立した経路を介して出力されるため、低周波帯域の信
号の音質に影響が生ずることもないし、また低周波帯域
の信号および高周波帯域の信号がそれぞれ通過する経路
は独立していて、再生装置系を通過する信号成分が異な
ることがないため、低周波帯域における音質変化も発生
することなく、高周波帯域の信号による脳波の周波数分
布の変化の適確な測定に使用することができる。As explained above, according to the present invention, the low-frequency band signal that has passed through the low-pass means is always outputted via the same path, and the high-frequency band signal that has passed through the high-pass means is outputted through the same path. Since it can be selectively output in addition to the low frequency band signal, when outputting the high frequency band signal, the low frequency band signal is always output through the same independent path without passing through another path. Therefore, the sound quality of the low-frequency band signal is not affected, and the paths through which the low-frequency band signal and high-frequency band signal pass are independent, and the signal components passing through the playback system are different. Therefore, it can be used to accurately measure changes in the frequency distribution of brain waves due to signals in the high frequency band without causing any change in sound quality in the low frequency band.
第１図は本発明の一実施例に係わる音響装置の回路構成
を示すブロック図、第２図は第１図の音響装置に使用さ
れるローパスフィルタおよびバイパスフィルタの特性を
示す図、第３図は第１図の音響装置を脳波測定に使用し
た場合の構成を示す図、第４図は第３図の測定法で測定
した場合の脳波スペクトルを示す図、第５図は従来の音
響装置の構成を示すブロック図である。
１・ ・音源、
３・ ・プリアンプ、
５・ ・ローパスフィルタ、
７・ ・スイッチ、
９・ ・バイパスフィルタ、
１１．１３・ ・パワーアンプ、
１７・ ・スピーカ、
１９．２３・ φツイータ。
代理人 弁理士 三 好 秀 和第２図
業３図
第１図
第４図FIG. 1 is a block diagram showing the circuit configuration of an audio device according to an embodiment of the present invention, FIG. 2 is a diagram showing the characteristics of a low-pass filter and a bypass filter used in the audio device of FIG. 1, and FIG. 1 is a diagram showing the configuration when the acoustic device shown in FIG. FIG. 2 is a block diagram showing the configuration. 1. Sound source, 3. Preamplifier, 5. Low pass filter, 7. Switch, 9. Bypass filter, 11.13. Power amplifier, 17. Speaker, 19.23. φ tweeter. Agent Patent Attorney Hide Kazuyoshi 2nd Business 3 Figure 1 Figure 4
Claims (1)
音楽等に係る信号を発生する信号発生手段と、該信号発
生手段から発生する信号のうち低周波帯域の信号を通過
させる低域通過手段と、前記信号発生手段から発生する
信号のうち前記低周波帯域を除去した高域周波帯域の信
号を選択的に通過させる高域通過手段と、前記低域通過
手段を通過した低周波信号を増幅して出力する低域出力
手段と、前記高域通過手段を通過した高周波信号を増幅
して出力する高域出力手段とを有する構成の音響装置を
使用して、高周波信号に対する聴取者の脳波に基づき音
質変化の検知状況を判断することを特徴とする脳波計測
による音質変化検知方式。a signal generating means for generating a signal related to music or the like in an audio frequency band and a frequency band exceeding the audio frequency band; a low-pass means for passing a signal in a low frequency band among the signals generated from the signal generating means; A high-pass means for selectively passing a high-frequency band signal from which the low-frequency band has been removed from the signal generated by the signal generation means, and a low-frequency signal that has passed through the low-pass means and is amplified and output. The sound quality changes based on the listener's brain waves in response to the high-frequency signal using an acoustic device configured to include a low-frequency output means for amplifying and outputting the high-frequency signal that has passed through the high-frequency signal. A sound quality change detection method using brain wave measurement, which is characterized by determining the detection status of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1100319A JP2788476B2 (en) | 1989-04-21 | 1989-04-21 | Sound equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1100319A JP2788476B2 (en) | 1989-04-21 | 1989-04-21 | Sound equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02279134A true JPH02279134A (en) | 1990-11-15 |
| JP2788476B2 JP2788476B2 (en) | 1998-08-20 |
Family
ID=14270867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1100319A Expired - Lifetime JP2788476B2 (en) | 1989-04-21 | 1989-04-21 | Sound equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2788476B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100366072B1 (en) * | 1995-07-29 | 2003-02-26 | 삼성에스디아이 주식회사 | Power cutoff device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS612204U (en) * | 1984-06-11 | 1986-01-08 | 日立化成工業株式会社 | Brain wave detection device |
-
1989
- 1989-04-21 JP JP1100319A patent/JP2788476B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS612204U (en) * | 1984-06-11 | 1986-01-08 | 日立化成工業株式会社 | Brain wave detection device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100366072B1 (en) * | 1995-07-29 | 2003-02-26 | 삼성에스디아이 주식회사 | Power cutoff device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2788476B2 (en) | 1998-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3920904A (en) | Method and apparatus for imparting to headphones the sound-reproducing characteristics of loudspeakers | |
| US11115743B2 (en) | Signal processing device, signal processing method, and program | |
| BE1007806A3 (en) | A magnetic resonance apparatus comprising a communication system. | |
| JPH077799A (en) | Recording media with stereo enhancement | |
| JP2010226329A (en) | Portable terminal device | |
| JP3548347B2 (en) | Automatic volume control | |
| JP3023424B2 (en) | Loudspeaker with abnormality monitoring device | |
| CN113327569A (en) | Noise reduction method, system and device for pure-tone audiometer | |
| JP2788476B2 (en) | Sound equipment | |
| JPH11261356A (en) | Sound reproduction device | |
| JP4482247B2 (en) | Automatic sound quality volume adjustment sound system and sound quality volume adjustment method | |
| JPH09116362A (en) | Automatic volume control device | |
| JP2723782B2 (en) | Hearing measurement device and hearing aid system | |
| Bauer et al. | A loudness-level monitor for broadcasting | |
| JP3329224B2 (en) | Acoustic characteristics measurement device | |
| JPH0494204A (en) | Gain control circuit and environment noise collection device | |
| JP2944225B2 (en) | Stereo signal processor | |
| JPS5811800B2 (en) | Sound image position measuring device for reproduced acoustic signals in multi-channel acoustic signal reproduction equipment | |
| RU2297712C2 (en) | Method for tuning sound-reproducing channel | |
| Ashihara | Combination tone: Absent but audible component | |
| Christen et al. | Preferred listening levels for bands of speech in relation to hearing aid selection | |
| JPH06133953A (en) | Hearing function test equipment | |
| Hara et al. | Perceptibility of environmental sounds by earphone wearers listening to pop and rock music | |
| JPH02279163A (en) | Acoustic device | |
| JPH10341123A (en) | Acoustic reproduction device |