WO2006038380A1 - 立体音響再生装置 - Google Patents
立体音響再生装置 Download PDFInfo
- Publication number
- WO2006038380A1 WO2006038380A1 PCT/JP2005/014786 JP2005014786W WO2006038380A1 WO 2006038380 A1 WO2006038380 A1 WO 2006038380A1 JP 2005014786 W JP2005014786 W JP 2005014786W WO 2006038380 A1 WO2006038380 A1 WO 2006038380A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sound
- channel
- reverberation
- delay time
- reverberant
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
- H04S3/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K15/00—Acoustics not otherwise provided for
- G10K15/08—Arrangements for producing a reverberation or echo sound
- G10K15/12—Arrangements for producing a reverberation or echo sound using electronic time-delay networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
- H04S7/305—Electronic adaptation of stereophonic audio signals to reverberation of the listening space
Definitions
- the present invention relates to a three-dimensional sound reproducing apparatus that outputs a multi-channel surround sound signal to a plurality of speakers connected to a main body, and a three-dimensional sound that improves the sound connection S between the speakers connected to the main body.
- the present invention relates to a sound reproducing device.
- Multi-channel surround sound is output from multiple speakers placed around the listening position when the user operates the equipment of this multi-channel surround system to play content containing multi-channel surround sound, such as DVDs.
- content containing multi-channel surround sound such as DVDs.
- the conventional multi-channel surround system has a sound field correction circuit that can automatically set a hall simulation mode that reproduces the sound of a hall (theatre) according to the music genre of the input music signal in order to enhance the sound effect.
- a hall simulation mode that reproduces the sound of a hall (theatre) according to the music genre of the input music signal in order to enhance the sound effect.
- Patent Document 1 JP-A-8-37700
- Patent Document 2 JP 2004-159037 A
- the sound field correction circuit described in Patent Document 1 reproduces the sound of the hall (theatre), but the frequency characteristics of the sound to be reproduced are not flat. As a result, the sound connection between the speakers is improved, but the sound field feeling included in the original content is lost because the sound field is changed to an arbitrary sound field such as a hall.
- an object of the present invention is to provide a stereophonic sound reproducing apparatus that can improve the sound connection between the speakers that emit multi-channel surround sound.
- the present invention has the following configuration as means for solving the above-described problems.
- the rear reverberant group power surround sound having the same envelope characteristics for each channel is added. Therefore, by adding a rear reverberation group with similar envelope characteristics to each channel of multi-channel surround sound, the sound output from each speaker connected to the stereophonic sound reproduction device is resonated. Since the rear reverberation sound can be added, the sound connection between the speakers can be improved. Also, since the rear reverberation group added to each channel has a non-uniform delay time interval and is different for each channel, it is possible to prevent the rear reverberation sound of each channel from being monolithic and to give a natural reverberation.
- the filter means is a cascade type FIR (Finite Im pulse Response) filter that performs the convolution operation.
- FIR Finite Im pulse Response
- the rear reverberation sound adding means includes delay time switching means capable of changing a delay time interval of the rear reverberation sound group according to the type of audio data or content included in the content.
- the delay time interval of the rear reverberation group can be changed by the delay time switching means.
- the recording environment differs depending on the content, and the reverberation time also varies depending on the recording environment, so changing the delay time interval of the rear reverberation group according to the type of content makes it appropriate for the content recording environment.
- a long reverberation sound can be emitted.
- the filter means sets the frequency characteristics of the rear reverberant group of the multi-channel surround sound signal to be flat for each channel.
- the stereophonic sound reproducing device of the present invention is a multi-channel surround sound that emits a short and precise rear reverberation sound with a frequency characteristic S flat and uniform envelope characteristics from each speaker. By adding, the sound connection between the speakers can be improved. Therefore, the listener uses the stereophonic sound reproducing device of the present invention. By using it, you can enjoy the feeling of being surrounded by natural reverberation.
- FIG. 1 is a layout diagram showing a state in which a three-dimensional sound reproducing device according to an embodiment of the present invention is installed in a listening room.
- FIG. 2 is a block diagram showing a schematic configuration of the stereophonic sound reproducing device according to the embodiment of the present invention.
- FIG. 3 is a circuit diagram showing a detailed configuration of a reverberant sound generating unit of the stereophonic sound reproducing device according to the embodiment of the present invention.
- FIG. 4 is a diagram showing a group of reverberant sounds generated by a cascade type FIR filter.
- FIG. 5A is a graph showing frequency characteristics and gain characteristics of reverberant sound.
- FIG. 5B is a graph showing frequency characteristics and gain characteristics of reverberant sound.
- FIG. 6 is a diagram showing a group of reverberant sounds generated when parameters set in a cascaded FIR filter are changed.
- No.1 amplifier (voice amplification means)
- Rear reverberation generator (rear reverberation generator)
- FIG. 1 is a layout view showing a state in which the three-dimensional sound reproduction device according to the embodiment of the present invention is installed in a listening room.
- FIG. 2 is a block diagram showing a schematic configuration of the stereophonic sound reproducing device according to the embodiment of the present invention.
- an audio amplifier for a 5.1 channel hereinafter referred to as ch
- ch an audio amplifier for a 5.1 channel
- the front right channel is R (Right) ch
- the front left channel is L (Left) ch
- the center channel is C (Center r) ch.
- the rear right channel is called SR (Surround Right) ch
- the rear left channel is called SL (Surro und Left) ch
- the subwoofer is called LFE (Low Frequency Effects) ch.
- LFEch audio is output only when heavy bass is added to the content, so in the following description, explanation of processing of LFEch audio signals is omitted.
- the audio amplifier 1 includes a DVD player 2 and an Rch speaker 5R.
- each speaker may be arranged around the listening position of user U in the arrangement recommended in ITU-R BS. 775-1.
- the audio amplifier 1 receives the audio signal of each channel that is output when the DVD player 2 plays a DVD 3 on which content containing 5. lch surround sound is recorded.
- the audio amplifier 1 includes an audio signal input terminal 11 (11R, 11L, 11C, 11SR, 11SL), DSP12, DZA converter (DAC) 13 (13R, 13L, 13C, 13SR, 13SL ), Electronic volume 14 (14R, 14L, 14C, 14SR, 14SL), power amplifier (sound amplification means) 15 (15R, 15L, 15C, 15SR, 15SL), audio signal output terminal 16 (16R, 16L, 16C, 16SR, 16SL), a memory 17, a controller 18, an operation unit 19, and a display unit 20.
- the audio signal input terminal 11 is connected to an audio signal output terminal (not shown) of the DVD player 2.
- the audio signal output from the DVD player 2 is input to the audio amplifier 1.
- the audio signal input terminal 11 includes an Rch audio signal input terminal 11R, an Lch audio signal input terminal 11L, a Cch audio signal input terminal 11C, an SRch audio signal input terminal 11SR, and an S Lch audio signal input terminal 11SL.
- the DSP 12 includes an initial reflected sound generation unit 21 (21R, 21L, 21C, 21SR, 21SL), a rear reverberation sound generation unit (rear reverberation sound generation means) 22 (22R, 22L, 22C, 22SR, 22SL), and Adder 23 (23R, 23L, 23C, 23SR, 23SL) is provided.
- the initial reflected sound is one of the elements that form the sound field.
- the reflected sound that arrives after being reflected only once on the wall or ceiling at a relatively early time is called the initial reflected sound.
- the reverberant sound is a reflected sound that repeatedly arrives at a delay of two or more reflections among the elements that form the sound field. The time for the sound to decay to 60 dB is expressed as the reverberation time.
- the initial reflected sound generation unit 21 adds initial reflected sounds of a hall (theatre) or a church to the direct sound (original sound) of the content reproduced by the DVD player 2.
- the setting is made so that the initial reflected sound is generated by operating the operation unit 19 to generate the initial reflected sound. it can.
- the rear reverberation sound generation unit 22 generates a rear reverberation sound based on the direct sound or the initial reflected sound included in the content reproduced by the DVD player 2.
- the adder 23 adds and outputs the direct sound and the early reflection sound included in the sound of the content reproduced by the DVD player 2 and the rear reverberation sound generated by the rear reverberation sound generator 22.
- the adder 23 also includes a direct sound included in the sound of the content reproduced by the DVD player 2, an initial reflected sound generated or generated by the initial reflected sound generating unit 21, and a rear reverberant sound generating unit 22. The generated rear reverberation sound is added and output.
- the DZ A converter 13 converts the digital audio data output from the DSP 12 into analog audio data.
- the electronic volume 14 adjusts the volume of the sound emitted from the speaker 5 (5R, 5L, 5C, 5SR, 5SL) according to the control signal output from the controller 18 according to the operation of the operation unit 19. Adjust.
- the power amplifier 15 amplifies the audio data adjusted by the electronic volume 14 and outputs the amplified audio data to each speaker connected to the output terminal 16.
- the audio signal output terminal 16 (16R, 16L, 16C, 16SR, 16SL) is for connection to each speaker 5 (5R, 5L, 5C, 5SR, 5SL) that emits surround sound.
- Each speaker 5 (5R, 5L, 5C, 5SR, 5SL) is connected to the audio signal output terminal 16 (16R, 16L, 16C, 16SR, 16SL), respectively, and is predetermined around the viewing position of the user U. They are arranged at intervals, and sound corresponding to the sound data output from the power amplifier 15 is emitted to form a surround sound field.
- the memory 17 stores a plurality of early reflection sound patterns generated by the initial reflection sound generation unit 21 and rear reverberation sound patterns generated by the rear reverberation sound generation unit 22.
- the memory 17 is preferably a RAM that can update parameters (filter coefficients) for generating the initial reflected sound and the rear reverberant sound.
- the controller 18 controls each unit in accordance with the operation performed on the operation unit 19. For example, when a volume adjustment operation is performed by the operation unit 19, the controller 18 outputs a control signal corresponding to this operation to the electronic volume 14 and changes the volume of the sound emitted from the speaker 5. When the rear reverberation is adjusted by the operation unit 19, the controller 18 reads the reverberation pattern from the memory 17 and outputs it to the rear reverberation generation unit 22 of the DSP 12.
- the controller 18 is preferably a CPU or MPU.
- the operation unit 19 is used by the user to input various operations' settings to the audio amplifier 1.
- the display unit 20 is for displaying items transmitted from the audio amplifier 1 to the user.
- FIG. 3 is a circuit diagram showing a detailed configuration of the reverberant sound generating unit of the stereophonic sound reproducing device according to the embodiment of the present invention.
- Figure 4 shows a group of reverberant sounds generated by a cascaded FIR filter.
- FIG. 5 is a graph showing the frequency characteristics and gain characteristics of reverberant sound.
- FIG. 4 shows only the positive reverberation group.
- the rear reverberation generator 22 is a cascade-type F with two FIR filters connected in cascade.
- An IR filter (filter means) is provided, and FIG. 3 shows, as an example, a configuration in which an FIR filter a31 and an FIR filter b32 are connected in cascade.
- the FIR filter a31 includes a delay circuit 41, 36 multipliers 42, and an adder 43.
- the FIR filter b32 includes a delay circuit 44, 35 multipliers 45, and an adder 46.
- the number of taps of the FIR filter a31 is set to 36
- the number of taps of the FIR filter b is set to 35.
- the rear reverberation generators 22R, 22L, 22C, 22SR, and 22SL have the same configuration, and add rear reverberation to the audio signals of the Rch, Lch, Cch, SRch, and SLch channels.
- the controller 18 reads parameters (filter coefficients) from the memory 17 in advance, and each of the rear reverberation sound generation units 22 Set to. That is, the FIR filter a31 and the multiplier 32 are set with parameters for determining the spatial impression and the reverberation time, and the FIR filter b34 and the multiplier 35 are set with parameters for interpolating the reflected sound interval. The Therefore, by using the reflected sound parameters set in the rear reverberation sound generation unit 22 and performing convolution operations on the audio signals of each channel, as shown in FIG. The number can be 1260.
- parameters (filter coefficients) for determining the spatial impression and the reverberation time are set as described above.
- the 36 reverberant sound groups decay in about 100 milliseconds and the delay time interval is almost constant on average, but the delay time interval gradually increases as time passes. It is set to be shorter.
- the 36 reverberant groups are set to envelope characteristics that gradually decay over time so that they will sound natural.
- parameters (filter coefficients) for performing interpolation of the reflected sound interval are set as described above.
- 35 reverberation sounds attenuate in about 15 milliseconds and the delay time interval is almost constant on average, but the delay time interval gradually decreases as time passes. It is set to be.
- the 35 reverberant sound groups are set to have envelope characteristics of attenuation curves that are steeper than the envelope characteristics of the 36 reverberant sound groups of the FIR filter a31.
- the rear reverberation group of each channel generated by each of the rear reverberation sound generation units 22R, 22L, 22C, 22SR, and 22SL has an envelope characteristic of each channel.
- the parameters that are read from the memory 17 are set so that the delay time interval of the reverberant sound group is different for each channel.
- the parameters of each FIR filter are set so that the frequency characteristics of the rear reverberation generated by the cascade-type FIR filter become flat!
- the rear reverberation has a flat frequency characteristic as shown in FIG. 5A, the natural reverberation of the attenuation curve as shown in FIG. 5B does not adversely affect the frequency characteristic of the content. be able to. Furthermore, since the delay time of the rear reverberant sound differs for each channel, it is possible to prevent the rear reverberant sound of each channel from being monophonic and to soften the sound of the rear reverberant sound. Since the envelope of the rear reverberation sound of each channel is almost the same, the rear reverberation sound is added to the sound emitted from each speaker, and the sound having the same sound is output from the speaker of each channel. Thereby, the reverberation of the rear reverberant sound output from each speaker connected to the audio amplifier 1 can be made uniform, and the sound connection between the speakers can be improved.
- the parameters for FIR filter a and FIR filter b of each channel are created in advance so that the reverberation sound with natural reverberation is generated without arranging the sound of the content V based on the measured data. It should be stored in the memory 17.
- the parameter delay time interval is a random value and is set to be different for each channel. For example, a prime number (2, 3, 5, 7, 11...) It is better to set a random value.
- the filter coefficient of the FIR filter can be changed according to the audio data included in the content type to be played back by the DVD player 2.
- the delay time interval can be changed by changing the filter coefficient depending on whether or not the initial reflection sound is included in the audio of the content, and when the rear reverberation sound is generated from the direct sound.
- the delay time interval and the delay time interval when the rear reverberation sound is generated from the initial reflected sound By setting different values for the delay time interval and the delay time interval when the rear reverberation sound is generated from the initial reflected sound, the natural reverberant rear reverberation sound can be generated.
- the delay time interval can be changed depending on the content recording location.
- the reverberation characteristics differ depending on the recording location. For example, content recorded in a live house and content recorded in a church have a longer reverberation time. In this way, the sound reverberation varies depending on the recording location of the content to be played back.By operating the operation unit 19 and changing the delay time interval according to the recording location, the optimal rear reverberation sound for that content can be obtained. It can be added, and the user can hear reverberation without a sense of incongruity.
- the audio amplifier 1 of the present invention changes the reverberation time of the reverberant sound as described above using the cascade FIR filter. In this case, it is better to set the parameter so that the number of taps of the FIR filter a31 and the value of the envelope characteristic change.
- FIG. 6 is a diagram showing a group of reverberation sounds generated when the parameters set in the cascade type FIR filter are changed.
- FIG. 6 shows only a positive reverberation group.
- 18 reverberation groups decay in about 50 milliseconds and the delay time interval is almost constant on average, but the delay time interval gradually decreases as time passes.
- the parameters are set so that the 36 reverberant groups have envelope characteristics that gradually attenuate as time passes so that they resonate naturally.
- Fig. 6 shows that the parameters are set so that the 36 reverberant groups have envelope characteristics that gradually attenuate as time passes so that they resonate naturally.
- 35 reverberation sounds are attenuated in about 15 milliseconds, and the delay time interval is almost constant on average, but the delay becomes longer as time passes.
- the time interval is set to gradually shorten.
- 35 reverberation sounds The parameters of the group are set so that the envelope characteristics of the attenuation curve are steeper than the envelope characteristics of the 18 reverberant groups in the FIR filter a31.
- the rear reverberation sound generation unit 22 can generate a reverberation sound that attenuates in about 50 to 60 milliseconds.
- the reverberation time is longer than the reverberation sound shown in FIG. 4, the number of taps of the FIR filter a31 is further increased, and the time elapses so that the reverberation sound becomes natural. It is better to set the parameters so that the envelope characteristics gradually attenuate as the time increases. This makes it possible to change the reverberation time of the reverberant sound according to the audio data contained in the content or the type of content, and to add the optimal rear reverberant sound to the content. Can do.
- the present invention is not limited to this configuration.
- the multi-channel surround sound signal is output to a plurality of speakers connected to the main body.
- this is applicable even if the number of channels is different.
- the number of channels such as 3ch, 7ch, and 9ch may be increased or decreased.
- the listener can enjoy a sense of being surrounded by natural reverberation.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/576,224 US8116468B2 (en) | 2004-09-30 | 2005-08-11 | Stereophonic sound reproduction device |
EP05770487A EP1811809A4 (en) | 2004-09-30 | 2005-08-11 | THREE DIMENSIONAL ACOUSTIC REPRODUCTION DEVICE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-288203 | 2004-09-30 | ||
JP2004288203A JP2006101461A (ja) | 2004-09-30 | 2004-09-30 | 立体音響再生装置 |
Publications (1)
Publication Number | Publication Date |
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WO2006038380A1 true WO2006038380A1 (ja) | 2006-04-13 |
Family
ID=36142465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/014786 WO2006038380A1 (ja) | 2004-09-30 | 2005-08-11 | 立体音響再生装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US8116468B2 (ja) |
EP (1) | EP1811809A4 (ja) |
JP (1) | JP2006101461A (ja) |
WO (1) | WO2006038380A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090060236A1 (en) * | 2007-08-29 | 2009-03-05 | Microsoft Corporation | Loudspeaker array providing direct and indirect radiation from same set of drivers |
Families Citing this family (10)
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US8050434B1 (en) * | 2006-12-21 | 2011-11-01 | Srs Labs, Inc. | Multi-channel audio enhancement system |
JP2009128559A (ja) * | 2007-11-22 | 2009-06-11 | Casio Comput Co Ltd | 残響効果付加装置 |
JP4548516B2 (ja) * | 2008-05-26 | 2010-09-22 | カシオ計算機株式会社 | Firフィルタ装置、音響装置およびfirフィルタプログラム |
JP5593590B2 (ja) * | 2008-06-23 | 2014-09-24 | カシオ計算機株式会社 | 共鳴音発生装置、電子楽器および共鳴音発生プログラム |
KR101546849B1 (ko) | 2009-01-05 | 2015-08-24 | 삼성전자주식회사 | 주파수 영역에서의 음장효과 생성 방법 및 장치 |
JP5577787B2 (ja) * | 2009-05-14 | 2014-08-27 | ヤマハ株式会社 | 信号処理装置 |
KR101624904B1 (ko) * | 2009-11-09 | 2016-05-27 | 삼성전자주식회사 | 휴대용 단말기에서 디엔엘에이를 이용하여 멀티 사운드 채널 컨텐츠를 재생하기 위한 장치 및 방법 |
US9154897B2 (en) | 2011-01-04 | 2015-10-06 | Dts Llc | Immersive audio rendering system |
US20130163787A1 (en) * | 2011-12-23 | 2013-06-27 | Nancy Diane Moon | Electronically Orbited Speaker System |
JP6227295B2 (ja) * | 2013-06-25 | 2017-11-08 | 日本放送協会 | 空間音響生成装置およびそのプログラム |
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- 2005-08-11 EP EP05770487A patent/EP1811809A4/en not_active Ceased
- 2005-08-11 WO PCT/JP2005/014786 patent/WO2006038380A1/ja active Application Filing
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US20090060236A1 (en) * | 2007-08-29 | 2009-03-05 | Microsoft Corporation | Loudspeaker array providing direct and indirect radiation from same set of drivers |
US9031267B2 (en) * | 2007-08-29 | 2015-05-12 | Microsoft Technology Licensing, Llc | Loudspeaker array providing direct and indirect radiation from same set of drivers |
Also Published As
Publication number | Publication date |
---|---|
US20080247553A1 (en) | 2008-10-09 |
EP1811809A4 (en) | 2011-10-05 |
US8116468B2 (en) | 2012-02-14 |
EP1811809A1 (en) | 2007-07-25 |
JP2006101461A (ja) | 2006-04-13 |
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