JP2512038B2 - Sound field playback device - Google Patents
Sound field playback deviceInfo
- Publication number
- JP2512038B2 JP2512038B2 JP30501587A JP30501587A JP2512038B2 JP 2512038 B2 JP2512038 B2 JP 2512038B2 JP 30501587 A JP30501587 A JP 30501587A JP 30501587 A JP30501587 A JP 30501587A JP 2512038 B2 JP2512038 B2 JP 2512038B2
- Authority
- JP
- Japan
- Prior art keywords
- sound field
- cross
- correlation coefficient
- pass filter
- signal
- 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 - Lifetime
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- Stereophonic System (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、一般の音声や音楽を再生するTVやステレオ
に用いる音場再生装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound field reproducing device used for a TV or a stereo that reproduces general voice and music.
従来の技術 第４図は、従来の音場再生装置の構成を示すものであ
る。第４図において、12は入力信号のＬチャンネルとＲ
チャンネルの差成分をとる減算器、13、14は前記差信号
を遅延させる遅延器、15〜18は乗算器、19、20は加算器
である。2. Related Art FIG. 4 shows the configuration of a conventional sound field reproducing device. In FIG. 4, 12 is the L channel and R channel of the input signal.
Subtractors that take the difference component of the channel, 13 and 14 are delay devices that delay the difference signal, 15 to 18 are multipliers, and 19 and 20 are adders.
以上のように構成された音場再生装置について、以下
その動作について説明する。The operation of the sound field reproducing device configured as described above will be described below.
まず、入力信号の差を減算器12により求める。次に求
められた差信号を、遅延器13、14によってＬチャンネル
とＲチャンネルの信号を適当に遅延させる。ここで遅延
時間は20〜40mSとなっている。さらに、遅延された信号
と差信号に各々適当なK1〜K4を乗算器15〜18によって掛
け、加算器19、20にて加算され増幅されて、Ｌチャンネ
ル、Ｒチャンネルのリアスピーカ10、11から再生され
る。また、本来のＬ、Ｒ信号は直接フロントスピーカ
８、９から再生される。以上の動作により４本のスピー
カの中央付近に位置する受聴者は、狭い部屋においても
臨場感あふれる受聴が可能である。First, the subtracter 12 calculates the difference between the input signals. The difference signal thus obtained is appropriately delayed by the delay units 13 and 14 for the L channel and R channel signals. Here, the delay time is 20-40 mS. Further, the delayed signal and the difference signal are respectively multiplied by appropriate K1 to K4 by the multipliers 15 to 18, added and amplified by the adders 19 and 20, and output from the rear speakers 10 and 11 of the L channel and the R channel. Is played. The original L and R signals are reproduced directly from the front speakers 8 and 9. By the above operation, the listener located near the center of the four speakers can listen with a sense of realism even in a small room.
発明が解決しようとする問題点 しかしながら上記のような構成では、入力信号が何で
あっても常に同じ音場になっているため、人間の話し声
等の明瞭感が低下したり、またTV等では、場面にそぐわ
ない音場再生が行なわれるといった不都合があった。Problems to be Solved by the Invention However, in the above-mentioned configuration, since the sound field is always the same no matter what the input signal is, the clarity of the human voice or the like is reduced, or in a TV or the like, There was an inconvenience that the sound field was not played back in a suitable situation.
本発明は上記問題点に鑑み、２チャンネルの入力信号
の内容に応じた音場再生を行なうことが可能な音場再生
装置を提供するものである。In view of the above problems, the present invention provides a sound field reproducing device capable of reproducing a sound field according to the contents of input signals of two channels.
問題点を解決するための手段 上記問題点を解決するために、本発明の音場再生装置
は、２チャンネルの入力信号の相互相関係数を求める相
互相関係数演算手段と、前記入力信号の音声帯域の成分
を取り出す低域ろ波器と、前記音声帯域以外の成分を主
に取り出す高域ろ波器と、音場拡大部とからなる音場拡
大手段と、前記低域及び高域ろ波器により取り出された
信号に対し前記相互相関係数の値に応じて、それぞれ音
場拡大部の遅延器の遅延時間と乗算器の乗算係数を制御
する制御手段と、入力信号をそのまま再生する第１のス
ピーカと、前記音場拡大手段からの出力信号を再生する
第２のスピーカとを備え、前記音場拡大部は、２チャン
ネル信号の差信号を演算し、前記差信号と前記差信号を
遅延器により遅延させた信号とを、それぞれ乗算器で適
当な大きさにして加算演算することを特徴とするもので
ある。Means for Solving the Problems In order to solve the above problems, the sound field reproducing apparatus of the present invention comprises a cross-correlation coefficient calculating means for calculating a cross-correlation coefficient of input signals of two channels, and the input signal. A sound field expansion unit including a low-pass filter that extracts a component in the voice band, a high-pass filter that mainly extracts a component other than the voice band, and a sound field expansion unit, and the low and high band filters. The control unit for controlling the delay time of the delay unit and the multiplication coefficient of the multiplier of the sound field expansion unit for the signal extracted by the wave filter according to the value of the cross-correlation coefficient, and the input signal is reproduced as it is. The sound field expanding unit includes a first speaker and a second speaker that reproduces an output signal from the sound field expanding unit, and the sound field expanding unit calculates a difference signal between two channel signals, and outputs the difference signal and the difference signal. And the signal delayed by the delay device It is characterized in that an addition operation is performed with a calculator having an appropriate size.
作 用 本発明は、上記した構成により入力信号の相互相関係
数の値に応じ音場拡大量を自動的に設定するため入力信
号に応じ、明瞭感、臨場感のある再生が可能である。Operation According to the present invention, since the sound field expansion amount is automatically set according to the value of the cross-correlation coefficient of the input signal by the above-described configuration, it is possible to reproduce with a sense of clarity and a sense of presence according to the input signal.
実施例 以下、本発明の一実施例について、図面を参照しなが
ら説明する。Embodiment One embodiment of the present invention will be described below with reference to the drawings.
第１図は、本発明の第１の実施例における音場再生装
置の構成を示すものである。FIG. 1 shows the configuration of a sound field reproducing apparatus according to the first embodiment of the present invention.
第１図において、21、22は低域ろ波器、１は２チャン
ネルの入力信号（Ｒ、Ｌ）の相互相関係数を求める相互
相関係数演算手段である。２は音場拡大手段であり、第
２図にその詳細な構成を示す。音場拡大手段２は同図の
ように、LPF23、24とHPF25、26と音場拡大部28、29と加
算器19、20とから構成されている。さらに、音場拡大部
28、29は第３図のような構成となっており、２チャンネ
ルの差信号（Ｌ−Ｒ）を求める減算器12と、減算器12の
出力を遅延させる遅延器13、14と、減算器12の出力及び
遅延器13、14の出力の各レベルを調整する乗算器15、1
6、17、18と、乗算器15、16および乗算器17、18の出力
を加算する加算器19、20とからなる。３は音場拡大手段
２の音場拡大量を相互相関係数演算手段１の出力に応じ
設定する制御手段、４〜７は増幅器、８、９は第１のス
ピーカ、10、11は第２のスピーカである。In FIG. 1, reference numerals 21 and 22 are low-pass filters, and 1 is a cross-correlation coefficient calculation means for obtaining a cross-correlation coefficient of input signals (R, L) of two channels. Reference numeral 2 is a sound field expanding means, and its detailed configuration is shown in FIG. The sound field expansion means 2 is composed of LPFs 23 and 24, HPFs 25 and 26, sound field expansion units 28 and 29, and adders 19 and 20, as shown in FIG. Furthermore, the sound field expansion section
28 and 29 are configured as shown in FIG. 3, and have a subtracter 12 for obtaining a difference signal (LR) of two channels, delay devices 13 and 14 for delaying the output of the subtractor 12, and a subtractor. Multipliers 15 and 1 for adjusting the levels of the 12 outputs and the outputs of the delay units 13 and 14, respectively.
6, 17, 18 and adders 19, 20 for adding the outputs of the multipliers 15, 16 and the multipliers 17, 18, respectively. Reference numeral 3 is control means for setting the sound field expansion amount of the sound field expansion means 2 according to the output of the cross-correlation coefficient calculation means 1, 4 to 7 are amplifiers, 8 and 9 are first speakers, and 10 and 11 are second. Speaker.
まず、入力された２チャンネルの信号は、増幅器４、
７を通り第１のスピーカ８、９で再生される。一方、前
記２チャンネルの信号は、低域ろ波器21、22により低域
成分が取り出される。この低域成分について相互相関係
数演算手段１により音源の内容が判断される。音源の内
容を判断する方法として、２チャンネル入力信号の相互
相関係数を計算する。相互相関係数φxy（τ）は、入力
信号Ｌをｘ（ｔ）、入力信号Ｒをｙ（ｔ）とすると
（１）式のように表わされる。First, the input two-channel signal is input to the amplifier 4,
7 and is reproduced by the first speakers 8 and 9. On the other hand, low frequency components of the signals of the two channels are taken out by the low frequency filters 21 and 22. The content of the sound source is judged by the cross-correlation coefficient calculation means 1 for this low frequency component. As a method of judging the contents of the sound source, the cross-correlation coefficient of the 2-channel input signal is calculated. The cross-correlation coefficient φ xy (τ) is expressed by the equation (1) when the input signal L is x (t) and the input signal R is y (t).
ここから相互相関係数を求めるには、ある時間Ｔまで
の値を平均すれば、ある遅延時間τにおける相互相関係
数が求められる。 To obtain the cross-correlation coefficient from here, the values up to a certain time T are averaged to obtain the cross-correlation coefficient at a certain delay time τ.
相互相関係数は、入力信号が音声等の場合、入力信号
は同相に近くなるためτ＝０で相互相関係数は大きくな
る。入力信号が音楽信号の場合、色々な楽器成分が入っ
ているため相互相関係数は小さくなる傾向がある。As for the cross-correlation coefficient, when the input signal is voice or the like, the input signal is close to the in-phase, so that the cross-correlation coefficient becomes large at τ = 0. When the input signal is a music signal, the cross-correlation coefficient tends to be small because it contains various musical instrument components.
次に制御手段３により音場拡大手段２を構成する音場
拡大部の遅延器13、14や乗算器15〜18を、前記相互相関
係数の値に応じ制御する。Next, the control means 3 controls the delay devices 13 and 14 and the multipliers 15 to 18 of the sound field expanding section constituting the sound field expanding means 2 according to the value of the cross-correlation coefficient.
相互相関係数が大きい場合は、遅延器13、14の遅延時
間を小さく、乗算器15〜18の係数K1〜K4の値を小さくす
る。これにより再生音は第１のスピーカ８、９の直接音
に近くなり、明瞭感が向上する。一方、相互相関係数の
値が小さい場合は遅延器13、14の遅延時間を大きくして
いき、乗算器15〜18の係数K1〜K4の値はある一定定数と
しておく。これにより第２のスピーカ10、11からの再生
音は、直接音とＬ−Ｒ成分の遅延時間が長い音の加わっ
たものとなり、広い音場感で受聴する事が可能となる。When the cross-correlation coefficient is large, the delay times of the delay units 13 and 14 are made small, and the values of the coefficients K1 to K4 of the multipliers 15 to 18 are made small. As a result, the reproduced sound becomes close to the direct sound of the first speakers 8 and 9, and the clarity is improved. On the other hand, when the value of the cross-correlation coefficient is small, the delay times of the delay units 13 and 14 are increased, and the values of the coefficients K1 to K4 of the multipliers 15 to 18 are set to constant constants. As a result, the reproduced sound from the second speakers 10 and 11 is a combination of the direct sound and the sound with a long delay time of the L-R component, and can be heard with a wide sound field feeling.
第２図の低域ろ波器23、24の帯域としては特に音声が
含まれる帯域とする。一方、音場拡大部28は高域ろ波器
25、26により取り出された、前記帯域以外の帯域成分に
ついて音場拡大を行なう。音場拡大量としては、音場拡
大部29の拡大量を音場拡大部28に比べ小さく設定する。
これにより、音声帯域では定位が比較的はっきりし、音
楽信号等の帯域では臨場感のある音場で再生する事が可
能である。The band of the low-pass filters 23 and 24 shown in FIG. On the other hand, the sound field expansion section 28 is a high frequency filter.
The sound field is expanded with respect to the band components other than the band extracted by 25 and 26. As the sound field expansion amount, the expansion amount of the sound field expansion unit 29 is set smaller than that of the sound field expansion unit 28.
As a result, the localization is relatively clear in the audio band, and it is possible to reproduce in a sound field with a realistic sensation in the band of music signals and the like.
なお、上述した実施例では音場拡大手段２、音場拡大
部28、29の例をあげたが、他のディジタル信号処理によ
りFIR型のたたみ込み演算による方法、ドルビー方式の
サラウンド方法等を用いても同様の効果が得られる。In the above-mentioned embodiment, the sound field expanding means 2 and the sound field expanding units 28 and 29 are taken as examples. However, other digital signal processing such as FIR type convolution calculation method, Dolby surround method, etc. are used. However, the same effect can be obtained.
また、スピーカを４チャンネル再生としたが、スピー
カ数を増やしても良い。Also, although the speakers are reproduced in four channels, the number of speakers may be increased.
さらに、上記実施例の低域ろ波器を帯域ろ波器に変え
ても同様の効果が得られる。Further, the same effect can be obtained by replacing the low pass filter of the above embodiment with a band pass filter.
発明の効果 以上のように本発明は、２チャンネルの入力信号の相
互相関係数を求める相互相関係数演算手段と、前記入力
信号の音声帯域の成分を取り出す低域ろ波器と、前記音
声帯域以外の成分を主に取り出す高域ろ波器と、音場拡
大部とからなる音場拡大手段と、前記低域及び高域ろ波
器により取り出された信号に対し前記相互相関係数の値
に応じて、それぞれ音場拡大部の遅延器の遅延時間と乗
算器の乗算係数を制御する制御手段と、入力信号をその
まま再生する第１のスピーカと、前記音場拡大手段から
の出力信号を再生する第２のスピーカとを備え、前記音
場拡大部は、２チャンネル信号の差信号を演算し、前記
差信号と前記差信号を遅延器により遅延させた信号と
を、それぞれ乗算器で適当な大きさにして加算演算する
ことにより、入力信号の種類に応じて、再生音場を拡大
・縮小することが可能となり、また、入力信号の中でも
音声帯域と音楽帯域に分離し、それぞれに適した音場拡
大を行うことにより、音声帯域は明瞭度よく、音楽帯域
は広がり感や距離感を変化させて音場制御ができること
となる。EFFECTS OF THE INVENTION As described above, according to the present invention, a cross-correlation coefficient calculating means for obtaining a cross-correlation coefficient of two-channel input signals, a low-pass filter for extracting a component of a voice band of the input signals, and the voice A high-pass filter that mainly takes out components other than the band, a sound field expansion unit that includes a sound field expansion unit, and a cross-correlation coefficient of the cross-correlation coefficient for the signals extracted by the low-pass filter and the high-frequency filter. Control means for controlling the delay time of the delay device of the sound field expansion unit and the multiplication coefficient of the multiplier according to the value, the first speaker for reproducing the input signal as it is, and the output signal from the sound field expansion unit. And a second speaker for reproducing the difference signal, wherein the sound field expansion unit calculates a difference signal between two channel signals, and the difference signal and a signal obtained by delaying the difference signal by a delay device are respectively multiplied by multipliers. By adding to a suitable size Depending on the type of input signal, the reproduced sound field can be expanded or reduced, and by separating the input signal into voice band and music band and expanding the sound field suitable for each, The band has good clarity, and the music band can control the sound field by changing the feeling of expansion and distance.
第１図は本発明の第１の実施例における音場再生装置の
ブロック図、第２図は同音場再生装置に係る音場拡大手
段のブロック図、第３図は同音場拡大手段内の音場拡大
部のブロック図、第４図は従来の音場再生装置のブロッ
ク図である。 １……相互相関係数演算手段、２……制御手段、３……
音場拡大手段、８、９……第１のスピーカ、10、11……
第２のスピーカ、12……減衰器、13、14……遅延器、1
5、16、17、18……乗算器、21、22、23、24……低域ろ
波器、25、26……高域ろ波器。FIG. 1 is a block diagram of a sound field reproducing device according to a first embodiment of the present invention, FIG. 2 is a block diagram of a sound field expanding device according to the same sound field reproducing device, and FIG. 3 is a sound in the sound field expanding device. FIG. 4 is a block diagram of the field expanding section, and FIG. 4 is a block diagram of a conventional sound field reproducing apparatus. 1 ... Cross-correlation coefficient calculation means, 2 ... Control means, 3 ...
Sound field expansion means, 8, 9 ... First speaker, 10, 11 ...
2nd speaker, 12 ... attenuator, 13, 14 ... delay device, 1
5, 16, 17, 18 …… Multiplier, 21, 22, 23, 24 …… Low-pass filter, 25, 26 …… High-pass filter.
フロントページの続き (72)発明者 渡辺 公治 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (56)参考文献 特開 昭58−96500（ＪＰ，Ａ) 特開 昭61−244200（ＪＰ，Ａ) 実開 昭61−19298（ＪＰ，Ｕ) 実開 昭56−155600（ＪＰ，Ｕ)Front page continuation (72) Inventor Koji Watanabe 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-58-96500 (JP, A) JP-A-61-244200 (JP) , A) Actually open 61-19298 (JP, U) Actually open 56-155600 (JP, U)
Claims (2)
求める相互相関係数演算手段と、 前記入力信号の音声帯域の成分を取り出す低域ろ波器
と、前記音声帯域以外の成分を主に取り出す高域ろ波器
と、音場拡大部とからなる音場拡大手段と、 前記低域及び高域ろ波器により取り出された信号に対し
前記相互相関係数の値に応じて、それぞれ音場拡大部の
遅延器の遅延時間と乗算器の乗算係数を制御する制御手
段と、 入力信号をそのまま再生する第１のスピーカと、 前記音場拡大手段からの出力信号を再生する第２のスピ
ーカとを備え、 前記音場拡大部は、２チャンネル信号の差信号を演算
し、前記差信号と前記差信号を遅延器により遅延させた
信号とを、それぞれ乗算器で適当な大きさにし加算演算
することを特徴とする音場再生装置。1. A cross-correlation coefficient calculation means for obtaining a cross-correlation coefficient of a two-channel input signal, a low-pass filter for extracting a component of a voice band of the input signal, and a component other than the voice band. Sound field expanding means including a high-pass filter and a sound field expanding section, which are extracted to the low-pass filter and the high-pass filter, respectively, according to the value of the cross-correlation coefficient for the signals extracted by the low-pass filter and the high-pass filter, respectively. A control unit for controlling the delay time of the delay unit of the sound field expansion unit and the multiplication coefficient of the multiplier, a first speaker for reproducing the input signal as it is, and a second speaker for reproducing the output signal from the sound field expansion unit. A speaker, and the sound field expansion unit calculates a difference signal between two channel signals, and adds the difference signal and a signal obtained by delaying the difference signal by a delay device to appropriate magnitudes by a multiplier and adding them. Sound field reproducing device characterized by calculation
入力信号の音声帯域成分の相互相関係数を求めることを
特徴とする特許請求の範囲第１項記載の音場再生装置。2. The sound field reproducing apparatus according to claim 1, wherein the cross-correlation coefficient calculating means obtains the cross-correlation coefficient of the voice band components of the input signals of two channels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30501587A JP2512038B2 (en) | 1987-12-01 | 1987-12-01 | Sound field playback device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30501587A JP2512038B2 (en) | 1987-12-01 | 1987-12-01 | Sound field playback device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01144900A JPH01144900A (en) | 1989-06-07 |
| JP2512038B2 true JP2512038B2 (en) | 1996-07-03 |
Family
ID=17940063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30501587A Expired - Lifetime JP2512038B2 (en) | 1987-12-01 | 1987-12-01 | Sound field playback device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2512038B2 (en) |
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|---|---|---|---|---|
| US5572591A (en) * | 1993-03-09 | 1996-11-05 | Matsushita Electric Industrial Co., Ltd. | Sound field controller |
| US7016501B1 (en) | 1997-02-07 | 2006-03-21 | Bose Corporation | Directional decoding |
| EP1054575A3 (en) * | 1999-05-17 | 2002-09-18 | Bose Corporation | Directional decoding |
| JP3682032B2 (en) * | 2002-05-13 | 2005-08-10 | 株式会社ダイマジック | Audio device and program for reproducing the same |
| US8300835B2 (en) | 2005-07-01 | 2012-10-30 | Pioneer Corporation | Audio signal processing apparatus, audio signal processing method, audio signal processing program, and computer-readable recording medium |
| JP5213339B2 (en) * | 2007-03-12 | 2013-06-19 | アルパイン株式会社 | Audio equipment |
| CN101681625B (en) | 2007-06-08 | 2012-11-07 | 杜比实验室特许公司 | Method and device for obtaining two surround sound audio channels by two inputted sound singals |
| JP2009224927A (en) * | 2008-03-14 | 2009-10-01 | Pioneer Electronic Corp | Acoustic apparatus, audio reproducing method, audio reproducing program and recording medium thereof |
| JP5324663B2 (en) * | 2009-11-02 | 2013-10-23 | パナソニック株式会社 | Acoustic signal processing apparatus and acoustic signal processing method |
| FR2954654B1 (en) * | 2009-12-23 | 2012-10-12 | Arkamys | METHOD OF GENERATING LEFT AND RIGHT SURROUND SIGNAL SIGNALS FROM A SOUND STEREO SIGNAL |
| JP5730555B2 (en) * | 2010-12-06 | 2015-06-10 | 富士通テン株式会社 | Sound field control device |
| JP5772356B2 (en) * | 2011-08-02 | 2015-09-02 | ヤマハ株式会社 | Acoustic characteristic control device and electronic musical instrument |
| WO2020075286A1 (en) * | 2018-10-12 | 2020-04-16 | 株式会社ソシオネクスト | Audio device and audio signal output method |
| WO2022249410A1 (en) | 2021-05-27 | 2022-12-01 | ファナック株式会社 | Imaging device for calculating three-dimensional position on the basis of image captured by visual sensor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5896500A (en) * | 1981-12-04 | 1983-06-08 | Matsushita Electric Ind Co Ltd | Echo adaptor |
| JPS6119298U (en) * | 1984-07-06 | 1986-02-04 | パイオニア株式会社 | delay device |
| JPS61244200A (en) * | 1985-04-20 | 1986-10-30 | Nissan Motor Co Ltd | Acoustic field improving device |
-
1987
- 1987-12-01 JP JP30501587A patent/JP2512038B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01144900A (en) | 1989-06-07 |
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