JPH0479600A - Sound field correction device - Google Patents
Sound field correction deviceInfo
- Publication number
- JPH0479600A JPH0479600A JP2191397A JP19139790A JPH0479600A JP H0479600 A JPH0479600 A JP H0479600A JP 2191397 A JP2191397 A JP 2191397A JP 19139790 A JP19139790 A JP 19139790A JP H0479600 A JPH0479600 A JP H0479600A
- Authority
- JP
- Japan
- Prior art keywords
- low
- pass filter
- sound field
- filter
- pass
- 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
- 230000009189 diving Effects 0.000 abstract 1
- 230000006870 function Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
Landscapes
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Stereophonic System (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、内勤車の車室内の左右非対称な音場を左右対
称な音場に補正する音場補正装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sound field correction device that corrects a left-right asymmetric sound field in the cabin of a work car to a left-right symmetric sound field.
従来の技術
第２図は従来の音場補正装置の構成を示している。第２
図において、１１はローパスフィルタ、１２はＡ／Ｄ変
換器である。１３はＦＩＲフィルタであシ、加算器１４
に接続されている。１５はＤ／Ａ変換器、１６はローパ
スフィルタである。BACKGROUND OF THE INVENTION FIG. 2 shows the configuration of a conventional sound field correction device. Second
In the figure, 11 is a low-pass filter, and 12 is an A/D converter. 13 is an FIR filter, adder 14
It is connected to the. 15 is a D/A converter, and 16 is a low-pass filter.
これらは右（Ｒ）チャネル、左（Ｌ）チャネルの各々に
設けられる。These are provided for each of the right (R) channel and left (L) channel.
次に」二記従来例の動作について説明する。第２図にお
いて、ローパスフィルタ１１にアナ口／”（７ｆ号が入
力されると、ローパスフィルタ１１のカッ１−オフ周波
数以上の周波数が減衰され、Ａ／Ｄ変換器１２によって
ディジタル信号に変換される。Next, the operation of the second conventional example will be explained. In FIG. 2, when the low-pass filter 11 receives an input signal, frequencies above the cut-off frequency of the low-pass filter 11 are attenuated and converted into a digital signal by the A/D converter 12. Ru.
Ａ／Ｄ変換器１２の出力は、Ｆ工Ｒフィルタ１３によっ
て所望の振幅・位相特性にされ、加算器１４で他チャネ
ルの信号とガ１算される。加算器１４の出力であるディ
ジタル信号は、Ｄ／Ａ変換器１５によってアナログ信号
に変換され、ローパスフィルタ１６によってカッ１−オ
フ周波数置」二の周波数が減衰された後、出力される。The output of the A/D converter 12 is made into desired amplitude and phase characteristics by an F/R filter 13, and is summed with the signals of other channels by an adder 14. The digital signal that is the output of the adder 14 is converted into an analog signal by the D/A converter 15, and after the frequency between the cutoff frequency and the cutoff frequency is attenuated by the low-pass filter 16, it is output.
ローパスフィルタ１１．１６のカットオフ周波数は、可
聴帯域が通過するように、２０ｋＨｚ 程度に設定さ
れ、Ａ／Ｄ変換器１２のサンプリング周波数は、例えば
コンパクトディスクのサンプリング周波数である４４．
１３ ・＼ −
ｋＨｚ に設定される。The cutoff frequency of the low-pass filters 11 and 16 is set to about 20 kHz so that the audible band passes, and the sampling frequency of the A/D converter 12 is set to 44.0 kHz, which is the sampling frequency of a compact disc, for example.
13 ・＼ − kHz is set.
ＦＩＲフィルタ１３の伝達関数ＣＬ、０Ｒ２ＴＬ。Transfer functions CL and 0R2TL of the FIR filter 13.
ＴＲは次のようにして求める。第３図のように補正対象
音場４のスピーカ２への入力からダミーヘッドマイクロ
ホン３の出力までの伝達関数をＨ１補正対象音場４に置
かれたダミーヘッドマイクロホン３の出力をＰ”、音場
補正装置１の伝達関数をＡ、第４図のように所望音場６
のスピーカ２へ入力からダミーヘッドマイクロホン３の
出力までの伝達関数をＫ、所望音場５に置かれたダミー
ヘッドマイクロホン３の出力をＲ１入力を工とすると、
Ａ＝Ｈ−に
とすることで、補正対象音場４の音場補正装置１を含め
た伝達関数は、
Ｒ’／工＝Ｈ−Ａ＝Ｈ−Ｈ−に＝に−Ｐ／Ｉとなり、所
望音場３の伝達関数と一致する。TR is determined as follows. As shown in Figure 3, the transfer function from the input to the speaker 2 of the sound field 4 to be corrected to the output of the dummy head microphone 3 is H1, the output of the dummy head microphone 3 placed in the sound field 4 to be corrected is P'', and the sound The transfer function of the field correction device 1 is A, and the desired sound field 6 is set as shown in FIG.
If K is the transfer function from the input to the speaker 2 to the output of the dummy head microphone 3, and the R1 input is the output of the dummy head microphone 3 placed in the desired sound field 5, then by setting A=H-. , the transfer function of the sound field 4 to be corrected, including the sound field correction device 1, is R'/F = H-A = H-H- = -P/I, which matches the transfer function of the desired sound field 3. do.
ただし、 である。however, It is.
このように、上記従来の音場補正装置１でも、補正対象
音場４を所望音場５に補正することができる。In this way, the conventional sound field correction device 1 described above can also correct the correction target sound field 4 to the desired sound field 5.
発明が解決しようとする課題
しかしながら、上記従来の宿場補正装置では、サンプリ
ング周波数が高いためにＦＩＲフィ／ｌ／り１３の演Ｗ
量が多く、ハードウェアの規模を小さくできないという
問題があった。又、可聴帯域全てを補正すると、聴取位
置が移動することによる特性の変化が大きく、聴感」二
問題があった。Problems to be Solved by the Invention However, in the conventional post station correction device described above, the sampling frequency is high, so the performance of the FIR fi/l/re13 is
There was a problem that the amount was large and the scale of the hardware could not be reduced. Furthermore, if the entire audible band is corrected, the characteristics will change significantly due to the movement of the listening position, causing two problems with auditory sensation.
本発明はこのような従来の問題を解決するものであり、
ＦＩＲフィルタの演算量を減らし、聴感上自然な音を再
生できる優れた音場補正装置を提供することを目的とす
るものである。The present invention solves these conventional problems,
It is an object of the present invention to provide an excellent sound field correction device that can reduce the amount of calculation of an FIR filter and reproduce aurally natural sound.
５ハ・−−一
課題を解決するだめの手段
本発明は」二記目的を達成するために、ローパスフィル
タとハイパスフィルタを設け、可聴周波帯域を低域側と
高域側に分割し、補正する帯域を低域側に限定するよう
にしだものである。5 C.--Means for Solving the Problem The present invention achieves the object described in 2 above by providing a low-pass filter and a high-pass filter, dividing the audio frequency band into a low frequency side and a high frequency side, and performing correction. It is designed to limit the frequency band to the low frequency side.
作 用
しだがって、本発明によれば、ローパスフィルタとハイ
パスフィルタによって入力信号を補正する帯域と補正し
ない帯域に分け、低域側のみを補正するようにしてＡ／
Ｄ変換器のサンプリング周波数を下げることによＪ、Ｆ
ＩＲフィルタの演算量を小さくすることができる。また
、高域を補正しガいために、聴取位置の移動によって生
じる高域の補正誤差を無くすることができ、聴感上自然
表音が再生できるという効果を有する。Therefore, according to the present invention, the input signal is divided into a band to be corrected and a band not to be corrected using a low-pass filter and a high-pass filter, and only the low-frequency side is corrected.
J, F by lowering the sampling frequency of the D converter
The amount of calculation for the IR filter can be reduced. Further, since the high frequency range is corrected, it is possible to eliminate high frequency correction errors caused by movement of the listening position, and it has the effect that aurally natural phonetic sounds can be reproduced.
実施例
第１図は本発明の一実施例の描成を示すものである。第
１図において、２１．２２はカットオフ周ｅ数を１〜４
ｋＨｚ とするローパスフィルタ、１２はＡ／Ｄ変換
器、１３はＦＩＲフィルタ、１４゜６ ′・
１っけ加算器、１５はＤ／Ａ変換器、１７はカットオフ
周波数がローパスフィルタ２１のソレト同一ノハイパス
フィルタ、１８は遅延器である。Embodiment FIG. 1 shows a depiction of one embodiment of the invention. In Figure 1, 21.22 indicates the cutoff frequency e from 1 to 4.
kHz, 12 is an A/D converter, 13 is an FIR filter, 14 is a 6'/1-key adder, 15 is a D/A converter, 17 is the same cutoff frequency as the low-pass filter 21. 18 is a delay device.
次に上記実施例の動作について説明する。」二記実施例
において、ローパスフィルタ２１にアナログ信号が入力
されると、カッ１−オフ周波数置」二の高域周波数が減
衰され、Ａ／Ｄ変換器１２によってディジタル信号に変
換される。Ａ／Ｄ変換器１２の出力は、ＦＩＲフィルタ
１３によって所望の振幅・位相特性にされ、加算器１４
で加算される。Next, the operation of the above embodiment will be explained. In the second embodiment, when an analog signal is input to the low-pass filter 21, high frequencies between the cutoff frequency and the cutoff frequency are attenuated and converted into a digital signal by the A/D converter 12. The output of the A/D converter 12 is made into desired amplitude and phase characteristics by the FIR filter 13, and then sent to the adder 14.
is added.
加算器１４の出力であるディジタル信号は、Ｄ／Ａ変換
器１６によってアナログ信号に変換され、ロバスフイル
り２２によってカットオフ周波数以下
どなる。一方、入力されたアナログ信号は、ロバスフイ
ルり２２と同じカッ１−オフ周１を持つハイパスフィル
タ１７によって、カットオフ周波数以下の低域周波数が
減衰され、遅延器１８によってＦＩＲフィルタ１３によ
って生じる遅延分遅延されて、加算器１９のもう一方の
入力となる。The digital signal that is the output of the adder 14 is converted into an analog signal by the D/A converter 16, and is reduced to below the cutoff frequency by the robust filter 22. On the other hand, the input analog signal is attenuated by a high-pass filter 17 having the same cut-off frequency 1 as the robust filter 22, and a delay device 18 attenuates the delay caused by the FIR filter 13. It is delayed and becomes the other input of the adder 19.
加算器１９は２つの信号を加算して出力する。Adder 19 adds the two signals and outputs the result.
ＦＩＲフィノ１／夕１３の伝達関数は、前記従来例と同
様に求めることができる。The transfer function of FIR FINO 1/FIR 13 can be obtained in the same manner as in the conventional example.
このように、上記実施例によれば、ローパスフィルタ２
１とハイパスフィルタ１７によって、入力信号が補正す
る低周波帯域と補正しない高周波帯域に分けられ、補正
を低周波帯域に限定しているのでＡ／Ｄ変換器１２のサ
ンプリング周波数を下げることができ、ＦＩＲフィルタ
１３の演算量を少なくすることができるという利点を有
する。In this way, according to the above embodiment, the low-pass filter 2
1 and the high-pass filter 17, the input signal is divided into a low frequency band to be corrected and a high frequency band not to be corrected, and since the correction is limited to the low frequency band, the sampling frequency of the A/D converter 12 can be lowered. This has the advantage that the amount of calculation for the FIR filter 13 can be reduced.
壕だ、」二記実施例によれば、高域を補正しないために
、聴取位置の移動によって生じる高域の補正誤差が無く
なり、聴感上自然な音を再生することができるという効
果を有する。According to the second embodiment, since the high frequency range is not corrected, there is no high frequency correction error caused by movement of the listening position, and it is possible to reproduce sounds that are audibly natural.
なお、ローパスフィルタ１１とハイパスフィルタ１６の
カットオフ周波数を、１に〜４ｋＨｚ程度にすることで
、聴感上自然な音が再生でき、また１に〜４ｋＨｚ以下
の帯域だけを補正するだけでも、充分な音場補正効果が
得られることが確認された。By setting the cutoff frequency of the low-pass filter 11 and the high-pass filter 16 to about 1 to 4 kHz, it is possible to reproduce audibly natural sound, and it is sufficient to correct only the band below 1 to 4 kHz. It was confirmed that a sound field correction effect can be obtained.
発明の効果
本発明は上記実施例より明らかなように、補正する帯域
を低域に限定したのでＦＩＲフィルタの演算量を少なく
できるという利点を有する。そして、更に、高域は補正
しないだめ、聴感上自然な音を再生できるという効果を
有する。Effects of the Invention As is clear from the above embodiments, the present invention has the advantage that the amount of computation of the FIR filter can be reduced because the band to be corrected is limited to the low range. Furthermore, it has the effect of reproducing audibly natural sound without correcting the high range.
第１図は本発明の一実施例における音場補正装置の構成
を示すブロック図、第２図は従来の音場補正装置の構成
を示すブロック図、第３図は補正対象音場の信号の流れ
を説明する概略図、第４図は所望音場の信号の流れを説
明する概略図である。
１・・・・・・音場補正装置、４・・・・・・補正対象
音場、５・・・・・・所望音場、１１．１６，２１．２
２・・・・・・ローバスフィルタ、１２・・・・・・Ａ
／Ｄ変換１ｉ、１３・・・・・・ＦＩＲフィルタ、１４
．１９・・・・・・’ＪＪＩＩ算Ｒ’４．１５・・・・
・・Ｄ／Ａ変換器、１７・・・・・ハイパスフィルタ、
１８・・・・・・遅延器。FIG. 1 is a block diagram showing the configuration of a sound field correction device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a conventional sound field correction device, and FIG. 3 is a block diagram showing the configuration of a sound field correction device according to an embodiment of the present invention. Schematic diagram explaining the flow. FIG. 4 is a schematic diagram explaining the flow of the signal of the desired sound field. 1... Sound field correction device, 4... Sound field to be corrected, 5... Desired sound field, 11.16, 21.2
2...Low-pass filter, 12...A
/D conversion 1i, 13...FIR filter, 14
．． 19...'JJII Calculation R'4.15...
...D/A converter, 17...high pass filter,
18...Delay device.
Claims (1)
と、可聴周波数帯域の高域側を通過させるハイパスフィ
ルタと、前記ローパスフィルタを通過した帯域の信号の
振幅および位相を補正するＦＩＲフィルタと、前記ハイ
パスフィルタの出力とＦＩＲフィルタの出力を加算する
手段とを有する音場補正装置。a low-pass filter that passes the low end of the audible frequency band; a high-pass filter that passes the high end of the audible frequency band; an FIR filter that corrects the amplitude and phase of the signal in the band that has passed through the low-pass filter; and the high-pass filter. A sound field correction device comprising means for adding the output of the filter and the output of the FIR filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2191397A JP2945724B2 (en) | 1990-07-19 | 1990-07-19 | Sound field correction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2191397A JP2945724B2 (en) | 1990-07-19 | 1990-07-19 | Sound field correction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0479600A true JPH0479600A (en) | 1992-03-12 |
| JP2945724B2 JP2945724B2 (en) | 1999-09-06 |
Family
ID=16273925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2191397A Expired - Fee Related JP2945724B2 (en) | 1990-07-19 | 1990-07-19 | Sound field correction device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2945724B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0655984A (en) * | 1992-08-08 | 1994-03-01 | Nissan Motor Co Ltd | Stereophonic sound field alarm device |
| US5883962A (en) * | 1995-06-15 | 1999-03-16 | Binaura Corporation | Method and apparatus for spatially enhancing stereo and monophonic signals |
| US6804358B1 (en) | 1998-01-08 | 2004-10-12 | Sanyo Electric Co., Ltd | Sound image localizing processor |
| WO2007007468A1 (en) * | 2005-07-11 | 2007-01-18 | Pioneer Corporation | Audio signal processing device, audio signal processing method, program thereof, and recording medium containing the program |
| JP2008058984A (en) * | 1998-03-25 | 2008-03-13 | Dolby Lab Licensing Corp | Audio signal processing method and apparatus |
| JP2009500669A (en) * | 2005-07-06 | 2009-01-08 | 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 | Parametric multi-channel decoding |
| JP2010120633A (en) * | 2008-11-20 | 2010-06-03 | Harman Internatl Industries Inc | System for active noise control using audio signal compensation |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3353786B1 (en) * | 2015-09-25 | 2019-07-31 | Dolby Laboratories Licensing Corporation | Processing high-definition audio data |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS615611A (en) * | 1984-06-20 | 1986-01-11 | Matsushita Electric Ind Co Ltd | Sound field correcting equalizer |
| JPH02161900A (en) * | 1988-09-21 | 1990-06-21 | Hitachi Ltd | Vehicle mounted acoustic apparatus |
-
1990
- 1990-07-19 JP JP2191397A patent/JP2945724B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS615611A (en) * | 1984-06-20 | 1986-01-11 | Matsushita Electric Ind Co Ltd | Sound field correcting equalizer |
| JPH02161900A (en) * | 1988-09-21 | 1990-06-21 | Hitachi Ltd | Vehicle mounted acoustic apparatus |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0655984A (en) * | 1992-08-08 | 1994-03-01 | Nissan Motor Co Ltd | Stereophonic sound field alarm device |
| US5883962A (en) * | 1995-06-15 | 1999-03-16 | Binaura Corporation | Method and apparatus for spatially enhancing stereo and monophonic signals |
| US6804358B1 (en) | 1998-01-08 | 2004-10-12 | Sanyo Electric Co., Ltd | Sound image localizing processor |
| JP2008058984A (en) * | 1998-03-25 | 2008-03-13 | Dolby Lab Licensing Corp | Audio signal processing method and apparatus |
| JP4726875B2 (en) * | 1998-03-25 | 2011-07-20 | ドルビー ラボラトリーズ ライセンシング コーポレイション | Audio signal processing method and apparatus |
| JP2009500669A (en) * | 2005-07-06 | 2009-01-08 | 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 | Parametric multi-channel decoding |
| WO2007007468A1 (en) * | 2005-07-11 | 2007-01-18 | Pioneer Corporation | Audio signal processing device, audio signal processing method, program thereof, and recording medium containing the program |
| JPWO2007007468A1 (en) * | 2005-07-11 | 2009-01-29 | パイオニア株式会社 | Audio signal processing apparatus, audio signal processing method, program thereof, and recording medium recording the program |
| JP4494470B2 (en) * | 2005-07-11 | 2010-06-30 | パイオニア株式会社 | Audio signal processing apparatus, audio signal processing method, program thereof, and recording medium recording the program |
| JP2010120633A (en) * | 2008-11-20 | 2010-06-03 | Harman Internatl Industries Inc | System for active noise control using audio signal compensation |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2945724B2 (en) | 1999-09-06 |
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| Date | Code | Title | Description |
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| LAPS | Cancellation because of no payment of annual fees |