WO2005067341A1 - スピーカ装置 - Google Patents
スピーカ装置 Download PDFInfo
- Publication number
- WO2005067341A1 WO2005067341A1 PCT/JP2005/000159 JP2005000159W WO2005067341A1 WO 2005067341 A1 WO2005067341 A1 WO 2005067341A1 JP 2005000159 W JP2005000159 W JP 2005000159W WO 2005067341 A1 WO2005067341 A1 WO 2005067341A1
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- WIPO (PCT)
- Prior art keywords
- speaker
- array
- block
- blocks
- channel
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
- H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
- H04R2205/022—Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/20—Processing of the output signals of the acoustic transducers of an array for obtaining a desired directivity characteristic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
Definitions
- the present invention relates to a speaker device that controls the directivity of an audio signal using a speaker array in which a plurality of speaker elements are arranged in an array.
- Patent Document 1 A technique for controlling the directivity of sound signal propagation using a plurality of speakers arranged in an array has been conventionally proposed (for example, Patent Document 1).
- FIG. 10 is a diagram illustrating the basic principle of this technology. This figure shows an example in which audio signals are output from a plurality of small speakers arranged in a straight line, and the audio signals are controlled so as to be directed to a focal point F. Power to output the same audio signal from each speaker At that time, a delay is given so that the audio signal from each speaker reaches the focal point F at the same time. By performing such control, it is possible to form a sound beam having directivity only in a certain direction with a sound pressure distribution as shown in FIG. By setting the focal point F in the direction of the wall surface, a virtual sound source in the direction of the wall surface can be formed for a viewer who listens to the sound beam reflected on the wall surface.
- an audio signal processing unit as shown in FIG. 12 is connected to the speaker array of FIG.
- the audio signal is input to the delay circuit and delayed, and the audio signal is extracted from taps T (N), T (N + 1), and ⁇ of a predetermined delay amount corresponding to each speaker.
- the extracted audio signal was multiplied by a gain coefficient by coefficient multipliers 101 (N), 101 (N + 1), ⁇ , and amplified by amplifiers 102 (N), 102 (N + 1). After that, sound is emitted from each speaker 103 (N), 103 (N + 1), ".
- the gain coefficient multiplied by the coefficient multiplier is a window function or the like.
- the loudspeakers are arranged in a line in the horizontal direction as shown in Fig. 10, directivity control in any horizontal direction is possible, and wide directivity (cone beam) is obtained in the vertical direction.
- the speakers are arranged in a horizontal / vertical matrix, the directivity can be controlled in any direction in both the horizontal and vertical directions.
- the directivity of the sound is controlled using the array speaker, and the virtual sound source can be set in the direction of the wall away from the speaker.
- multiple beams are separately formed to generate the multi-channel virtual sound source. Since it can be formed with one (one set) of array speakers, it is being put to practical use. 5. It is suitable for implementing a multi-channel source such as one channel with a simple audio device configuration.
- Patent Document 1 International Publication 01 Z231 04 A2
- this method has the following problems.
- the lower limit frequency at which the directivity can be controlled by the array speaker is determined by the entire width of the array. That is, in order to perform good control, a width several times the wavelength is required. For example, since the wavelength is 30 cm at 1 kHz, it is desirable to secure a width of about 1 m.
- the controllable upper limit frequency is determined by the interval (pitch) between the small speakers (speaker elements). If the wavelength is shorter than the pitch, the beam will be formed in the grating lobe, that is, in a direction other than the intended direction. Therefore, it is desirable that both the diameter of the speaker element itself and the pitch between the elements are as small as possible.
- the speaker is downsized to shorten the pitch, There is a problem that the output volume is insufficient because the power that can be obtained is small and the conversion efficiency is poor. Further, while controlling the wide frequency band, the size of the speakers is reduced to shorten the pitch, while the number of speakers must be increased when the array width is widened, which causes a problem that the device becomes large-scale. If the three-dimensional control is performed by arranging the speakers in a plane, there is a problem that the scale of the apparatus is further increased. On the other hand, considering the practical effect, the directivity control in the horizontal direction is very useful, but the advantage of the directivity control in the vertical direction is relatively small. Humans have high sensitivity to horizontal sound source recognition due to binaural processing.
- the input power of a general full-range speaker of 3 cm or less is about 2 W, and if 20 line arrays are arranged, the total power will be only 40 W. There is no problem as a normal TV speaker, but not as the total power of multi-channel audio speakers. Feet. Also, when forming a beam, it is impossible to operate all speakers at full power to multiply by a window function or the like. Disclosure of the invention
- An object of the present invention is to provide a speaker device having an optimum size and an optimum size while maintaining a practically effective configuration of a line array speaker.
- the present invention has the following arrangement as means for solving the above problems.
- a speaker array configured by arranging a plurality of speaker elements
- An audio signal processing unit that forms a plurality of speaker blocks in which a part of the plurality of speaker elements are grouped, and outputs input audio signals of a plurality of systems to separate speaker blocks,
- a speaker device comprising:
- the speaker array is configured by arranging a plurality of speaker elements in a horizontal row to form a speed block, and stacking the speaker blocks in a plurality of stages.
- each of the speaker blocks is configured as a separate speaker unit, and the speaker array is configured by stacking the speaker units.
- the speaker block includes a high-range speaker block and a low-range speaker block, and the width of the speaker block for the high-range signal is smaller than the width of the speaker block for the low-range signal.
- a speaker array in which a plurality of speaker rows in which a plurality of speaker elements are arranged in a horizontal row are stacked in a plurality of stages, and the speaker elements of the speaker rows stacked vertically are arranged in a zigzag manner.
- the audio signal is divided into a plurality of frequency bands, and the high-range signal is input to a speaker block consisting of two or more steps of the power train, and the low-range signal is converted to one-step speed.
- the speaker block has a line array shape, it is possible to obtain more efficient power than a planar speaker array using a two-dimensional window function.
- By partially overlapping the grouped speaker blocks it is possible to arbitrarily realize the number of sound connection signals and output power required for the system while maintaining a practically efficient line array speaker configuration.
- By configuring the system by stacking as a unit it is possible to design and manufacture one unit to build a flexible system and a rich lineup according to the application of the system.
- the unit can be divided into units, maintenance such as manufacturing 'transportation' analysis can be performed efficiently.
- the upper limit frequency is defined by the pitch (interval) of the speaker elements
- the lower limit frequency is defined by the entire width of the speaker array.
- a plurality of audio signals are distributed to a plurality of speaker blocks and output, so that audio power input to each speaker element is dispersed, and a speaker array including small speaker elements is provided. Even in this case, it is possible to output sound with sufficient power comprehensively.
- the speaker block is composed of a horizontal array of line arrays, it is possible to construct a speaker device that has the optimum power and scale for the system while maintaining the characteristics of a practically efficient line array speaker.
- FIG. 1 is a diagram illustrating a configuration of a speaker array of a speaker device according to an embodiment of the present invention.
- FIG. 2 is a diagram illustrating the directivity of an audio signal beam formed by the speaker device.
- FIG. 3 is a diagram illustrating another embodiment of the speaker array.
- FIG. 4 is a diagram illustrating another embodiment of the speaker array.
- FIG. 5 is a diagram illustrating another embodiment of the speaker array.
- FIG. 6 is a diagram illustrating another embodiment of the speaker array.
- FIG. 7 is a diagram illustrating another embodiment of the speaker array.
- FIG. 8 is a diagram illustrating an embodiment of the audio signal processing unit.
- FIG. 9 is a diagram illustrating another embodiment of the audio signal processing unit.
- FIG. 10 is a diagram illustrating the principle of beam control by a speaker array.
- FIG. 11 is a diagram showing a sound pressure distribution of a beam formed by the speaker array.
- FIG. 12 is a diagram showing an example of an audio signal processing unit for driving a speaker array.
- FIG. 1 is a diagram showing a speaker device according to a first embodiment of the present invention.
- the speaker device consists of a speaker array 1 and an audio signal processing unit. 1, and a speaker block allocated on the speaker array 1 by the audio signal processing unit.
- the speaker array 1 is composed of five rows of speaker rows 2 (2-1, 2-2, 2-3, 2-4, 2-5). Each channel of the multi-channel audio source is assigned to each speaker row. That is, each speaker row is a speaker block.
- the center row C is assigned to the first row (top row) of speaker rows 2-1, the front left channel FL is allocated to the second row of speaker rows 2-2, and the third row of speaker rows 2- 3 is assigned the front right channel FR, the fourth row of speakers 2-4 is assigned the rear left channel RL, and the 5th (bottom row) speaker row 2-5 is assigned the right rear channel RR.
- the five rows of speaker arrays may be integrally formed as a speaker array 1, or may be formed by stacking five line array speaker units each including one row of speaker rows. In this embodiment, since each row of speaker arrays (line array speaker units) corresponds to a different audio channel, the audio signal processing device is shown in FIG. 12 for each channel (speaker array).
- An audio signal processing circuit is provided to provide directivity only in the horizontal direction.
- each speaker block has a line array shape, and the output power for each channel can be sufficiently increased.
- a window function is applied to alleviate the divergence of the directional characteristic due to the boundary condition, and control is performed so that the output of the speaker power becomes smaller toward the end. This eliminates the need for functions and increases the power that can be input as a whole.
- virtual speakers can be formed in the wall direction for each channel as shown in Fig. 2, and a single speaker array can output multi-channel surround sound. Will be possible. Since each channel is output from a horizontal speaker block, the sound of each channel is omnidirectional in the vertical direction, and the sound quality does not change depending on the attitude of the listener.
- 3 to 7 are diagrams illustrating other embodiments of the speaker device.
- FIG. 3 is a diagram showing an example in which the speaker array is configured by two stages of speaker arrays.
- This speaker array has a speaker block B01 that divides the entire speaker array, a speaker block B02 that divides the upper speaker row, and a lower speaker row as shown in FIG.
- the speaker block B03 is formed by the audio signal processing unit.
- Center block C is assigned to speaker block B01
- front left channel FL and rear left channel RL are assigned to speaker block B02
- front right channel FR and rear right channel RR are assigned to speaker block B03.
- FIG. 4 is a diagram illustrating an example in which the speaker array is configured with three rows of speakers. In this speaker array, as shown in FIG.
- the speaker block B11 which is divided into the second (center) speaker row, and the first (upper) speaker row, are divided into sections.
- a speaker block B15 is defined by the audio signal processing unit, and the speaker block B15 has a second row of speakers in the third row.
- the speaker block B1 1 has the center channel C
- the speaker block B1 2 has the front left channel F
- the speaker block B1 3 has the front right channel FR power
- the speaker block B1 4 has the rear left channel RL.
- Speaker block B1 5 has rear right channel RR
- the assigned rear left channel RL inputs 70 / one cent of power to the first stage and 30 / cent cent to the second stage of the total power, and the rear right channel RR inputs 3/30 of the total power. 70% power is input to the second row, and 30% power is input to the second row. This equalizes the power distribution in each stage.
- the speaker array is composed of three speaker rows, the second speaker row is shifted from the upper and lower speaker rows, and the first and second rows and the second and third rows are zigzag.
- FIG. 4 is a diagram showing an example in which the arrangement is made as follows.
- FIG. 3 illustrates the speaker blocks set in the speaker array and the channels assigned to each speaker block.
- a speaker block for the center channel C, the front left channel FL, and the front right channel FR is set by the audio signal processing unit.
- the left half of the speaker block B21 for the center channel C is divided into the first (upper) and the second row of speaker rows, and the right half is the second and third (lower) row of speakers. It is a section.
- the speaker block B22 for the front left channel “Shinoshi” defines the first and second row of speakers.
- the speaker block B23 for the front right channel FR is the second and third row of speakers. Since each speaker block uses a two-stage loudspeaker array including the second stage, the zigzag arrangement of the speaker elements reduces the horizontal pitch by half, resulting in a high-frequency range. Have improved directional control characteristics.
- FIG. 6 shows an example in which a speaker array is composed of speaker rows arranged in a two-stage zigzag. As shown in FIG.
- the following speaker blocks are set by the audio signal processing unit in the speaker array, and signals of different channel 'frequency bands are assigned to the respective speaker blocks.
- a center channel C is assigned to a speaker block B41 that partitions the entire speaker array.
- the treble range Lh of the left channel is assigned to the speaker block B42 that divides the left half (two rows) of the speaker array.
- the left-hand bass range LI is assigned to the speaker block B43 that divides the upper speaker row.
- the treble range Rh of the right channel is assigned to the speaker block B44 which divides the right half (two rows) of the speaker array.
- the lower-range RI of the right channel is assigned to the speaker block B45 that defines the lower speaker row.
- a speaker block that allocates a single row of speaker rows to low-range signals and a half of two row of speaker rows to allocate high-range audio signals are allocated.
- the bass signal is output from the speaker block with a long array width-wide pitch (speaker interval)
- the treble signal is output from the short array width ⁇ (using two rows) short pitch speaker block.
- the grating lobes in the high frequency range can be eliminated, and the difference in directional characteristics between the high frequency range and the low frequency range can be reduced.
- a window function (Hanning window, Hamming window, etc.) that reduces the power from the center to the edge.
- the value of the window function becomes maximum at the center of the speaker array.
- the loudspeaker block in the high-frequency range is divided into left and right parts at the center of the speaker array, the center of the speaker array is the end of the speaker block, and the value of the window function is minimized.
- FIG. 7 shows an example in which the speaker array has a three-stage zigzag arrangement similar to that of FIG.
- a speaker block B51 that divides the second row (center) of the loudspeakers into sections, and the left half of the first and second tiers of loudspeakers form a section.
- Speaker block ⁇ 52 speaker block that divides the first (upper) speaker row ⁇ 53, speaker block ⁇ ⁇ 54 that divides the right half of the second and third row of speaker rows ⁇ 54, and A speaker block # 55 that divides the third row (lower row) of speaker rows is formed by the audio signal processing unit.
- Speaker block ⁇ 51, center channel C power speaker block ⁇ 52, left channel high range Lh power speaker block B33, left channel low range LI, speaker block B54 right channel high range Rh, speaker block Block B55 is assigned to the bass RI of the right channel. According to this configuration, it is possible to achieve an output power about 1.5 times that of the two-stage configuration shown in FIG.
- the present invention is not limited to these examples, and the configuration of the present invention is to form the speaker blocks into a horizontally long row, and to configure the speaker blocks so that the output sound pressure of each row is as uniform as possible. And the number of channels assigned to each speed element is made as small as possible.
- the audio signal processing unit of the speaker device will be described with reference to FIG. 8 and FIG. In these figures, for simplicity of explanation, the left channel, right channel R, and center channel C (Fig. 8 only) were used for a speaker array in which two rows of four speaker elements were stacked.
- a directivity control circuit 20 (20C, 20R) is provided for each channel in order to control the directivity of the audio signals of the center channel C, the left channel L, and the right channel R.
- Each directivity control circuit 20 is configured as shown in FIG. 12 and is a circuit that outputs an input audio signal to each of the speed elements in the speaker block with a predetermined delay and a predetermined gain. is there.
- the audio signal delayed and gain-controlled by each directivity control circuit 20C, 20L, 20R is input to an adder 21 corresponding to a speaker element assigned to each channel and added.
- the added audio signal is amplified by the amplifier 22 and then output from the speaker elements s P1 to sP8.
- the assignment of the speaker blocks as shown in FIG. 1B may be fixed, may be set by the user, or may be automatically changed. Is also good.
- the left channel and right channel R signals are each a high-pass filter.
- the high-pass filter 25L selects only the high-frequency range of the left-channel signal, and inputs the high-frequency signal of the left channel to the directivity control circuit 27Lh.
- the low-pass filter 26L selects only the low frequency range of the left channel signal, and inputs the low frequency range signal of the left channel to the directivity control circuit 27LI.
- the high-pass filter 25R selects only the high-frequency range of the right-channel signal, and inputs the high-frequency signal of the right channel to the directivity control circuit 27Rh.
- the low-pass filter 26R selects only the low frequency range of the right channel signal, and inputs the low frequency range signal of the right channel to the directivity control circuit 27RI.
- Each directivity control circuit 27 is configured as shown in FIG. 12 so that an input audio signal is output from the speaker block shown in FIG. 12B to form an audio beam and the directivity is controlled. Control the delay and gain.
- the audio signal delayed and gain-controlled by each directivity control circuit 27 is input to an adder 28 corresponding to a speaker element assigned to each channel and added.
- the added audio signal is amplified by the amplifier 29 and then output from the speaker elements sp "!-8.
Abstract
Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2005800021384A CN1910953B (zh) | 2004-01-07 | 2005-01-04 | 扬声器装置 |
US10/585,654 US7920710B2 (en) | 2004-01-07 | 2005-01-04 | Loudspeaker apparatus |
DE602005018446T DE602005018446D1 (de) | 2004-01-07 | 2005-01-04 | Lautsprechervorrichtung |
EP05703398A EP1711030B1 (en) | 2004-01-07 | 2005-01-04 | Speaker apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004002512A JP4161906B2 (ja) | 2004-01-07 | 2004-01-07 | スピーカ装置 |
JP2004-002512 | 2004-01-07 |
Publications (1)
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WO2005067341A1 true WO2005067341A1 (ja) | 2005-07-21 |
Family
ID=34747046
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/000159 WO2005067341A1 (ja) | 2004-01-07 | 2005-01-04 | スピーカ装置 |
Country Status (6)
Country | Link |
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US (1) | US7920710B2 (ja) |
EP (1) | EP1711030B1 (ja) |
JP (1) | JP4161906B2 (ja) |
CN (1) | CN1910953B (ja) |
DE (1) | DE602005018446D1 (ja) |
WO (1) | WO2005067341A1 (ja) |
Cited By (1)
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US20140226824A1 (en) * | 2007-05-04 | 2014-08-14 | Creative Technology Ltd. | Method for spatially processing multichannel signals, processing module, and virtual surround-sound systems |
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JP3915804B2 (ja) * | 2004-08-26 | 2007-05-16 | ヤマハ株式会社 | オーディオ再生装置 |
GB0514361D0 (en) * | 2005-07-12 | 2005-08-17 | 1 Ltd | Compact surround sound effects system |
JP4678305B2 (ja) * | 2006-01-05 | 2011-04-27 | ヤマハ株式会社 | 電子楽器 |
JP2007259088A (ja) * | 2006-03-23 | 2007-10-04 | Yamaha Corp | スピーカ装置およびオーディオシステム |
JP5023713B2 (ja) * | 2007-01-22 | 2012-09-12 | ヤマハ株式会社 | 音響発生装置 |
KR101297300B1 (ko) * | 2007-01-31 | 2013-08-16 | 삼성전자주식회사 | 스피커 어레이를 이용한 프론트 서라운드 재생 시스템 및그 신호 재생 방법 |
JP4962047B2 (ja) * | 2007-03-01 | 2012-06-27 | ヤマハ株式会社 | 音響再生装置 |
JP5082517B2 (ja) * | 2007-03-12 | 2012-11-28 | ヤマハ株式会社 | スピーカアレイ装置および信号処理方法 |
KR101292206B1 (ko) * | 2007-10-01 | 2013-08-01 | 삼성전자주식회사 | 어레이 스피커 시스템 및 그 구현 방법 |
JP5141390B2 (ja) * | 2008-06-19 | 2013-02-13 | ヤマハ株式会社 | スピーカ装置およびスピーカシステム |
CN101640831A (zh) * | 2008-07-28 | 2010-02-03 | 深圳华为通信技术有限公司 | 一种扬声器阵列设备及其驱动方法 |
KR101071959B1 (ko) * | 2009-02-13 | 2011-10-10 | 한국과학기술원 | 음향어레이 시스템 및 이 시스템의 제어방법 |
KR101825462B1 (ko) * | 2010-12-22 | 2018-03-22 | 삼성전자주식회사 | 개인 음향 공간 생성 방법 및 장치 |
CN108370468B (zh) * | 2015-12-07 | 2021-06-01 | 创新科技有限公司 | 条形音箱 |
US10440488B2 (en) * | 2016-06-27 | 2019-10-08 | International Business Machines Corporation | Intelligent audio control |
JP2018101452A (ja) * | 2016-12-20 | 2018-06-28 | カシオ計算機株式会社 | 出力制御装置、コンテンツ記憶装置、出力制御方法、コンテンツ記憶方法、プログラム及びデータ構造 |
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- 2005-01-04 EP EP05703398A patent/EP1711030B1/en not_active Expired - Fee Related
- 2005-01-04 US US10/585,654 patent/US7920710B2/en not_active Expired - Fee Related
- 2005-01-04 CN CN2005800021384A patent/CN1910953B/zh not_active Expired - Fee Related
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US20140226824A1 (en) * | 2007-05-04 | 2014-08-14 | Creative Technology Ltd. | Method for spatially processing multichannel signals, processing module, and virtual surround-sound systems |
US10034114B2 (en) * | 2007-05-04 | 2018-07-24 | Creative Technology Ltd | Method for spatially processing multichannel signals, processing module, and virtual surround-sound systems |
Also Published As
Publication number | Publication date |
---|---|
CN1910953A (zh) | 2007-02-07 |
JP4161906B2 (ja) | 2008-10-08 |
EP1711030B1 (en) | 2009-12-23 |
EP1711030A1 (en) | 2006-10-11 |
CN1910953B (zh) | 2011-04-06 |
DE602005018446D1 (de) | 2010-02-04 |
US7920710B2 (en) | 2011-04-05 |
US20080159566A1 (en) | 2008-07-03 |
JP2005198049A (ja) | 2005-07-21 |
EP1711030A4 (en) | 2007-09-05 |
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