WO2005067348A1 - スピーカアレイ用のオーディオ信号供給装置 - Google Patents
スピーカアレイ用のオーディオ信号供給装置 Download PDFInfo
- Publication number
- WO2005067348A1 WO2005067348A1 PCT/JP2005/000158 JP2005000158W WO2005067348A1 WO 2005067348 A1 WO2005067348 A1 WO 2005067348A1 JP 2005000158 W JP2005000158 W JP 2005000158W WO 2005067348 A1 WO2005067348 A1 WO 2005067348A1
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- WIPO (PCT)
- Prior art keywords
- directivity
- audio signal
- speaker
- array
- delay
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
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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
-
- 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
- H04R2205/041—Adaptation of stereophonic signal reproduction for the hearing impaired
-
- 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
Definitions
- the present invention relates to an audio signal supply device for supplying an audio signal such as voice to a speaker array constituted by a plurality of speaker units.
- Patent Document 1 Japanese Patent Application Laid-Open No.
- an audio signal supply device is an audio signal supply device for supplying an audio signal to a speed array constituted by a plurality of speed units, wherein each of the speaker units is provided.
- Delay means for performing a delay process on each of the audio signals supplied to each speaker unit according to the provided delay control information, and weighting according to the provided gain control information on each of the audio signals supplied to each of the speaker units.
- Weighting means a first directivity parameter for narrowing the directivity of the speaker array, and a second directivity parameter for widening the directivity of the speaker array.
- Storage means for storing; input means for inputting an instruction to select the directional characteristic; One of the directivity parameters is selected according to an instruction, the delay control information and the gain control information are generated based on the selected directivity parameter, and the directivity is supplied to the delay unit and the weighting unit. And control means.
- the user can select a directivity characteristic of the speaker array by operating a remote controller or the like, and can easily perform a simple operation as a whole, even at a low volume.
- the selection instruction to select the narrow directivity includes position information for determining a pointing direction, and the directivity control unit controls the narrow directivity.
- Another audio signal supply device is an audio signal supply device for supplying an audio signal to a speed array constituted by a plurality of speaker units, wherein an input audio signal is branched into two or more.
- First processing means for performing delay processing and / or weighting on each of the branched one audio signals supplied to each of the speaker units in accordance with first directivity control information given thereto;
- a second processing unit that performs delay processing and / or weighting on each of the branched one audio signals supplied to each of the speaker units according to second direction control information that is provided, and the first processing.
- the first directivity control information and the second directivity control information are generated so as to have different directivities, and the directivity control means that supplies the generated information to the first processing means and the second processing means And an adding means for adding the audio signal processed by the first processing means and the audio signal processed by the second processing means.
- one audio signal can be output simultaneously with two different directional characteristics.
- the musical sound 2 for the healthy person is output with wide directivity.
- the sound 1 for the hearing impaired is output with a narrow directivity toward the hearing impaired, so that both the healthy person and the hearing impaired can hear the satisfactory sound.
- the directivity characteristic of the speaker array realized by the first processing is narrow directivity
- the directivity characteristic of the speaker array realized by the second processing is wide directivity.
- the directional characteristics of the speed array realized by the respective processes may be narrow directivities directed in different directions (see FIG. 11).
- a frequency characteristic correction unit that performs frequency characteristic correction on the one branched audio signal is provided, and the first processing unit includes the speaker units. For each of the audio signals that have been subjected to the frequency characteristic correction and correction, the processing may be performed in accordance with the given first directivity control information.
- FIG. 1 is a diagram for explaining directivity control of the delay array system according to the first basic principle.
- FIG. 2 is a diagram illustrating a directivity distribution of the speaker array according to the same principle.
- FIG. 3 is a diagram showing a main configuration of an array speaker system to which the same principle is applied.
- FIG. 4 is a diagram showing a main configuration of an array speaker system adopting the Bessel array system according to the second basic principle.
- FIG. 5 is a diagram exemplifying the relationship between the arrangement of each speed unit and the gain according to the same principle.
- FIG. 6 is a diagram showing a configuration of a main part of the array force system according to the first embodiment.
- FIG. 7 is a view exemplifying an operation screen according to the embodiment.
- FIG. 8 is a view exemplifying an operation screen according to the embodiment.
- FIG. 9 is a diagram showing a configuration of a main part of an array speed force system according to the second embodiment.
- FIG. 10 is a diagram illustrating a directivity control pattern according to the embodiment.
- FIG. 11 is a diagram illustrating a directivity control pattern according to the embodiment.
- FIG. 1 is a diagram for explaining directivity control of a delay array system using a speaker array (composed of a plurality of small speaker units SP) according to the first basic principle.
- the amount of delay according to the difference between the path from the center of the speaker array to a certain point (focal point) in space and the path from the speed unit SP to the focal point is calculated for each speaker.
- the sound waves output from each speaker unit SP reach the focal point at the same time.
- each speaker unit SP is arranged at a virtual sounding place (a place where the distance from the focal point is the same) indicated by a broken line in FIG. 1, and as a result, the sound pressure near the focal point is obtained. Rises locally.
- FIG. 1 is a diagram for explaining directivity control of a delay array system using a speaker array (composed of a plurality of small speaker units SP) according to the first basic principle.
- FIG. 2 is a diagram exemplifying the directivity distribution of the speed array employing the delay array method, and the contour line of the sound pressure for every 3 dB is shown by a solid line.
- the loudspeaker array employing the delay array method can obtain a directivity distribution as if it were emitting a sound beam toward the focal point.
- FIG. 3 shows the main configuration of an array speaker system 100 employing this delay array system.
- the array speaker system 100 includes a speaker array 200 composed of a plurality of speaker units 210-k (1 ⁇ k ⁇ n), a delay circuit 300, and a directivity control device 400. , A weighting unit 500 and an amplification unit 600. Note that an AD converter and a DA converter are usually provided in a stage preceding the delay circuit 300 and a stage preceding the amplification unit 600, but are omitted for simplification.
- the delay circuit 300 performs a delay process on each of the audio signals supplied to each speaker unit 210-k according to the delay control information given from the directivity control device 400.
- the directivity control device 400 obtains a delay amount to be given to each of the above audio signals so that a focus is formed at a desired position, generates delay control information indicating each obtained delay amount, and generates a delay circuit. Supply to 300. Specifically, from the focus The above-mentioned delay amounts are calculated based on the spatial coordinates of each speaker unit 210-k and the spatial coordinates of the focal point so as to compensate for the difference in distance to each speaker unit 210-k (see FIG. 1). .
- the weighting unit 500 is composed of the same number of multipliers 51Ok as the speaker unit 210k, and a window function is applied to each of the delayed audio signals supplied from the delay circuit 300. Weights are added by weight coefficients such as coefficients and gain coefficients.
- the amplification unit 600 is composed of the same number of amplifiers 6110-k as the speaker units 210-k, and amplifies each audio signal to which a predetermined weight is added by the weighting unit 500.
- the audio signal amplified by the amplification unit 600 is input to each of the speaker units 210 k forming the speaker array 200 and output as sound waves.
- the sound waves output from each speaker unit 210-k have the same phase at an arbitrary point (focal point) in space, and the sound pressure in the focal point direction is locally increased. , Narrow directivity) is realized.
- the Bessel array is a method of making the radiation characteristics of sound spherical by weighting the rows of speaker units (speaker array) that are regularly arranged with coefficients based on the Bessel function.
- the principle itself is well known in the past, and is omitted.
- FIG. 4 shows an array speaker system 100 'using the Bessel array method.
- 5 is a diagram illustrating an example of the relationship between the layout of the speaker units 210-k constituting the speaker array 200 and the gain. Parts corresponding to those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.
- the speaker array 200 shown in FIGS. 4 and 5 includes seven speaker units 210-1 to 17 arranged linearly at substantially constant intervals.
- Each of the multipliers 5 1 0-1 to 1-7 constituting the weighting unit 5 0 0 performs a Bessel function on the audio signal supplied to the corresponding speaker unit 2 1 0-1 to 1-7, respectively.
- a weight (gain) is added by the derived Bessel array coefficients C 1 to C 7.
- FIG. 6 is a diagram showing a main configuration of the array speaker system 100 ′ ′′ according to the first embodiment.
- This array speaker system 100 ′ ′′ is a system that realizes switching (selection) of narrow directivity and wide directivity.
- the main part of the array speaker system 100 ′ of the formula and the main part of the array speaker system 100 ′ of the Bessel array type shown in FIG. 5 are provided. Parts corresponding to those in FIGS. 3 and 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.
- Each speaker unit 210_k is formed by a small speaker unit having a diameter of several cm or less.
- a small speaker unit has a wide directivity that is almost omnidirectional over a wide frequency range, so that a very wide directivity can be realized in directivity control using the Bessel array method.
- the focal direction can be widened to the left and right, and audio signals in a high frequency region can be controlled by densely arranging small speaker units.
- the directivity control device (storage means) 400 stores a first directivity parameter P1 and a second directivity parameter P2.
- the first directivity parameter P 1 is a parameter for realizing a narrow directivity in which a sound wave output from each speaker unit 210 k is directed in an arbitrary direction (focal direction).
- the plot P2 is a parameter for realizing a wide directivity in which the sound wave output from each speaker unit 210-k spreads over the entire space.
- the directivity control device (directivity control means) 400 receives the first directivity parameter P 1 or the second directivity parameter P 1 in accordance with an instruction to select the directivity of the speaker array 200 supplied from the operation unit 700.
- One of the directivity parameters P2 is selected, and delay control information and gain control information are generated based on the selected one of the directivity parameters (details will be described later).
- the operation unit (input means) 700 is a means for inputting an instruction to select the directional characteristic of the speaker array 200, and is constituted by various operation buttons, a remote controller, and the like. Fig.
- FIG. 7 shows the display unit connected to the array speaker system 100 '''.
- FIG. 7 is a diagram illustrating an operation screen g1 displayed on a device (for example, a plasma television or the like).
- the operation screen g1 displays a message for selecting one of the wide directivity and the narrow directivity. In accordance with this message, the user selects one of the directional characteristics by remote control operation or the like.
- an operation screen g2 shown in FIG. 8 is displayed on the display device.
- the user moves the listening position icon I1 shown on this operation screen g2 to a desired position by remote control operation or the like (see the broken line in FIG. 8).
- the operation unit 700 transmits a selection instruction to select narrow directivity and position information (position information for determining a directivity direction) representing a listening position to the directivity control device 4. 0 Supply to 0.
- the directivity control device 400 selects the first directivity parameter P1 according to the selection instruction supplied from the operation unit 700, and determines the focus position and the like based on the supplied position information. Then, based on the selected first directivity parameter P 1 and the determined focal position, etc., the amount of delay to be given to the audio signal supplied to each speaker unit 210-k is determined. Is generated, and this is supplied to a delay circuit (delay means) 300.
- the directivity control device 400 determines, based on the selected first directivity parameter P1, a coefficient to be multiplied by the audio signal supplied to each speaker unit 210-k (in this case, , And generates gain control information representing each of the obtained coefficients, and supplies this to the weighting unit 500.
- the audio signal input to the array speaker system 100 ′ ′′ is phase-controlled by the delay circuit 300, weighted by the window function coefficient by the weighting unit 500, and then added to the corresponding signal.
- the sound waves output from each speaker unit 210-k have the same phase at an arbitrary point (focal point) in space, and a narrow directivity desired by the user is realized.
- the operation unit 700 transmits a selection instruction to select the wide directivity to the directivity.
- the directivity control device 400 selects the second directivity parameter P2 according to the selection instruction supplied from the operation unit 700. Then, based on the selected second directivity parameter P2, the directivity control device 400 multiplies the delay amount to be applied to the audio signal supplied to each speaker unit 210-k and the audio signal by multiplying each of the audio signals. Find the coefficient to be used.
- the directivity control device 400 since the second directivity parameter P 2 for realizing wide directivity is selected, the directivity control device 400 has the same delay amount even if it is not “0” or “0”. And the Bessel array coefficient derived by the Bessel function. The directivity control device 400 generates delay control information and gain control information representing these, and supplies them to the delay circuit 300 and the weighting unit 500, respectively. As a result, the audio signal input to the array speaker system 100 ′ ′′ is weighted by the weighting unit 500 by the Bessel array coefficient, and wide directivity is realized.
- the array speaker system 100 ′ ′′ according to the first embodiment, it is possible to listen to a musical sound with a sufficient volume at a position in an arbitrary direction (focal direction) even if the volume is small as a whole. It is possible to switch between narrow directivity and wide directivity that allows high quality music to be heard regardless of the listening position.
- the wide directivity was realized by adopting the Bessel array method.
- the front center of the speaker array 200 can be controlled.
- Wide directivity can also be realized by a method of generating a close focus, or a method of simulating a tone so that a tone is output from an arbitrary point behind the speaker array 200. Note that any of these methods can be realized by the configuration of the array speaker system 100 ′ ′′.
- the volume at the time of viewing is often a problem.
- the sound volume may be just right for a healthy person, but too low for a hearing-impaired person to hear, or the sound volume may be too high for a healthy person if the sound volume is adjusted according to the hearing-impaired person.
- a method of providing a speaker or the like dedicated to a hearing-impaired person or the like for example, see Japanese Patent Application Laid-Open No. 2000-197716), (Japanese Patent Application Laid-Open No. 11-1367888) has been proposed in which a musical tone is output to a subject and a normal person listens to the sample at a position avoiding the directivity direction where the sound pressure is large. .
- the method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2000-197716 has a problem that a space for providing a speaker dedicated to a hearing-impaired person must be separately secured. Further, in the method disclosed in Japanese Patent Application Laid-Open No. 11-136788, the above directivity direction is directed to a hearing-impaired person. There is a problem that a healthy person who listens to the music at a location cannot listen to a sufficiently high quality musical sound.
- the invention according to the second embodiment has been made in view of these conventional problems.
- the purpose of the invention is to provide a hearing-impaired person and a healthy person even when a hearing-impaired person and a healthy person listen simultaneously.
- FIG. 9 is a diagram showing a main configuration of an array speaker system 100 ′ ′′ ′ according to the second embodiment.
- the same reference numerals are given to portions corresponding to the array speaker system 100'" shown in FIG. 6, and detailed description thereof will be omitted.
- the branching unit 800 divides the audio signal input to the array speaker system 100 ′ ′ ′ into two, and separates each branched audio signal into a first delay circuit 300 and a second delay circuit 3. 0 0 '.
- Each of the first delay circuit 300 and the second delay circuit 300 ′ is provided with each speaker unit according to the first delay control information and the second delay control information given from the directivity control device 400.
- Each of the audio signals supplied to 210-k is subjected to delay processing.
- the directivity control device (directivity control means) 400 controls the first delay control information and the second delay control so that different directivity characteristics are realized by each of the delay circuits 300 and 300 '. Generate information. Specifically, as shown in Fig.
- the Tone 2 is output with a wide directivity
- tone 1 for the hearing impaired is output with a narrow directivity toward the hearing impaired.
- the listening position of a hearing-impaired person and the listening position of a healthy person may be input by remote control operation or the like. In the following description, it is assumed for convenience that the first delay circuit 300 realizes wide directivity and the second delay circuit 300 ′ realizes narrow directivity.
- the first delay circuit 300 performs a delay process for realizing wide directivity on each audio signal, and supplies it to the corresponding multipliers 5110-k.
- the second delay circuit 300 ′ performs a delay process for realizing narrow directivity on each audio signal, and supplies the audio signal to the corresponding multiplier 5 10 ′ -k.
- the multipliers 5 1 0-k and 5 1 0 ′ -k weight each of the audio signals after each delay processing by a predetermined weight coefficient, and supply the weighted audio signals to the addition unit 900.
- the adder unit 900 is composed of the same number of adders 910-k as the speaker units 210-k. Each adder 910-k adds each audio signal supplied from the corresponding multiplier 510-k, 510-k. The audio signal added by each adder 910-k is supplied to the corresponding speaker unit 210-k via the amplifier 610-k. As a result, as shown in FIG. 10, the musical sound 2 for a healthy person is output from the speaker array 200 with a wide directivity, and the musical sound 1 for a hearing-impaired person is output from the speaker array 200 with a narrow directivity. Is output.
- an equalizer frequency characteristic correction means
- an equalizer EQ may be provided before the second delay circuit 300 ′ to correct the frequency characteristics of the branched audio signal.
- an equalizer EQ may be provided before each of the delay circuits 300 and 300 'to correct the frequency characteristics of the musical sound 1 for the hearing impaired and the musical sound 2 for the healthy person. According to this aspect, it is possible to reduce interference between the musical sound 1 and the musical sound 2 and the influence of the acoustic characteristics of the space.
- each listener may independently set each parameter of the equalizer EQ by operating the operation section 700 (such as remote control operation).
- the first delay circuit 300 and the second delay circuit 300 ′ have been described as having a mode in which both the wide directivity and the narrow directivity are compatible at the same time. is not.
- the musical sound 1 for a hearing-impaired person shown in Fig. 11 is output to a hearing-impaired person with a narrow directivity, while the musical sound 2 for a healthy person is output to a normal person with a narrow directivity.
- the first delay circuit 300 and the second delay circuit 300 ' are designed to realize narrow directivity for a hearing-impaired person and narrow directivity for a healthy person, respectively.
- First delay control information and second delay control information are generated.
- the number of branches of the audio signal and the number of delay circuits may be extended to three or more to realize many directivities at the same time.
- the wide directivity is realized by the delay control, but the wide directivity may be realized by the weight control as described in the first embodiment.
- the configuration according to the second embodiment (such as providing delay circuits in parallel) is applied to the array speaker system 100 ′ ′′ according to the first embodiment to realize narrow directivity in two directions. You may make it appear.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05703397A EP1705955B1 (en) | 2004-01-05 | 2005-01-04 | Audio signal supplying apparatus for speaker array |
CN200580001951XA CN1906972B (zh) | 2004-01-05 | 2005-01-04 | 扬声器阵列用的音频信号供给装置 |
DE602005018017T DE602005018017D1 (de) | 2004-01-05 | 2005-01-04 | Audiosignalzuführungsvorrichtung für eine lautsprechergruppe |
US10/585,269 US8199925B2 (en) | 2004-01-05 | 2005-01-04 | Loudspeaker array audio signal supply apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-000675 | 2004-01-05 | ||
JP2004000675A JP2005197896A (ja) | 2004-01-05 | 2004-01-05 | スピーカアレイ用のオーディオ信号供給装置 |
Publications (1)
Publication Number | Publication Date |
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WO2005067348A1 true WO2005067348A1 (ja) | 2005-07-21 |
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ID=34746956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/000158 WO2005067348A1 (ja) | 2004-01-05 | 2005-01-04 | スピーカアレイ用のオーディオ信号供給装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US8199925B2 (ja) |
EP (1) | EP1705955B1 (ja) |
JP (1) | JP2005197896A (ja) |
CN (1) | CN1906972B (ja) |
DE (1) | DE602005018017D1 (ja) |
WO (1) | WO2005067348A1 (ja) |
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- 2005-01-04 EP EP05703397A patent/EP1705955B1/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
EP1705955A4 (en) | 2007-09-05 |
DE602005018017D1 (de) | 2010-01-14 |
CN1906972B (zh) | 2010-09-29 |
US8199925B2 (en) | 2012-06-12 |
US20070165878A1 (en) | 2007-07-19 |
CN1906972A (zh) | 2007-01-31 |
JP2005197896A (ja) | 2005-07-21 |
EP1705955A1 (en) | 2006-09-27 |
EP1705955B1 (en) | 2009-12-02 |
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