WO2004054321A1 - オーディオ信号の再生方法及び再生装置 - Google Patents
オーディオ信号の再生方法及び再生装置 Download PDFInfo
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- WO2004054321A1 WO2004054321A1 PCT/JP2003/013574 JP0313574W WO2004054321A1 WO 2004054321 A1 WO2004054321 A1 WO 2004054321A1 JP 0313574 W JP0313574 W JP 0313574W WO 2004054321 A1 WO2004054321 A1 WO 2004054321A1
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Classifications
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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
- 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
- H04S—STEREOPHONIC SYSTEMS
- H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation
- H04S5/02—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
-
- 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
-
- 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
- H04S1/00—Two-channel systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2203/00—Details of circuits for transducers, loudspeakers or microphones covered by H04R3/00 but not provided for in any of its subgroups
- H04R2203/12—Beamforming aspects for stereophonic sound reproduction with loudspeaker arrays
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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
- 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
- H04R2430/25—Array processing for suppression of unwanted side-lobes in directivity characteristics, e.g. a blocking matrix
Definitions
- the present invention relates to a method and apparatus for reproducing an audio signal suitable for use in a home theater or the like.
- FIG. 1 shows an example of the speaker array 1.
- the speakers SP0 to SPn are arranged in a row in the horizontal direction.
- the audio signal is supplied from the source SC to the delay circuits D L0 to D Ln and is delayed by a predetermined time rO to rn, and the delayed audio signal is supplied to the speakers S P0 to S P through power amplifiers P A0 to P An.
- P A0 to P An are supplied to Pn respectively.
- the delay times 0 to rn of the delay circuits D L0 to D Ln will be described later.
- the loudspeaker array 10 has directivity in sound pressure, and the sound waves output from the speed forces SP0 to SPn converge to the location Ptg so that the parallel light is focused by the convex lens. .
- the location Ptg is referred to as a “focus”
- the speaker array 10 is referred to as a focus system.
- FIG. 2 When a two-channel stereo sound field is formed in a home theater or the like using the above-described speed array 10, the arrangement and state shown in FIG. 2 can be obtained. That is, in FIG. 2, the symbol RM indicates a rectangular room (closed space) serving as a reproduction sound field, and the left and right channels similar to the speaker array 10 are provided on the left and right sides of the wall WLF in front of the listener LSNR. Speaker arrays 10 L and 10 R are arranged.
- this virtual image RM ′ can be considered to be equivalent to the closed space of FIG. Set the focal point Ptg of 0 L to the virtual image LSNR 'of the listener LSNR.
- the sound wave AW L radiated from the spurious force array 10L is located at the position where the straight line connecting the speaker array 10L and the virtual image LSNR 'intersects on the wall surface WLL.
- the reflection reflects the focus Ptg at the position of the listener LSNR.
- the sound wave AWR radiated from the force array 1 ⁇ R is reflected at the position of the listener LSNR on the right side wall WLR where the straight line connecting the speed force array 10R and the virtual image of the listener LSNR intersects. The focus will be on Ptg.
- the focus Ptg of the left and right channels is focused on the position of the listener LSNR, and the listener LSNR can strongly perceive the sound image.
- the listener LSNR perceives each virtual speaker in the direction of the virtual image 1 • L, of the speaker array 10L (see FIG. 3) and the virtual image of the speaker array 10R. It is possible to perceive a sense of stereo that is wider than the installation interval of L, 10 R.
- FIG. 4 shows a case where a sound field of a 4-channel stereo is formed.
- the odd-numbered and even-numbered speakers emit the sound waves AWL and AWL B of the left front channel and the left rear channel, and the sound wave AWL is generated by the wall WLL.
- the position of the listener LSNR is focused, and the sound wave AWLB is reflected by the wall surface WLL and the rear wall surface WLB, and then is focused on the position of the listener LSNR.
- the odd-numbered and even-numbered speakers emit sound waves A WR and AWRB of the right front channel and the right rear channel, and are reflected by the wall surfaces W.LR and WLB. Then let the listener focus on the position of the LSNR.
- a surround stereo sound field can be formed without disposing a speaker behind the listener LS plate.
- the listener LSNR listens to the original sound wave AWL that reaches the position of the listener LSNR after being reflected by the wall surface WLL, and the sound wave that directly reaches the listener LSNR from the speaker array 10.
- AWnc also listens. In other words, "leakage sound AWnc" is heard from the speaker array 10L in the listener LSNR.
- the delay time is set to 0 to n so that the time delay of each sound wave constituting the original sound wave AWL is aligned with the position of the listener LSNR.
- Each sound wave constituting AWnc has a time delay. Therefore, even if each sound wave is synthesized at the position of the listener LSNR, the sound pressure does not increase. In other words, the sound pressure of the leak sound AWnc is lower than the original sound wave AWL.
- the listener LS dish listens to the original sound wave AWL and, at the same time, hears the leak sound AWnc which has a time delay with respect to the sound wave AWL.
- the quality of the reproduced sound of the speaker arrays 10L and 10R is degraded by the leak sounds AWnc and AWnc.
- the path of the original sound waves AWL and AWR is long, the time difference between the original sound waves AWL and WAR and the leak sound AWnc and AWnc becomes large, and the two sound waves are separated from each other.
- the path of the sound waves AWLB and AWRB of the rear channel is longer than the path of the sound waves AWL and AWR of the two-channel stereo speaker system shown in Fig. 2.
- the time difference between the sound waves AWLB, AWRB and the leak sound AWnc, AWnc becomes larger, so that they can be heard more clearly and separated.
- An object of the present invention is to provide a novel audio signal reproduction method and apparatus which can solve the problems of the conventional technology as described above.
- an audio signal is supplied to each of a plurality of first digital filters, and the outputs of the first plurality of digital filters are output to a plurality of speed-arrays.
- a predetermined delay time is set for each of the first plurality of digital filters so that the propagation delay times coincide with each other, and the audio signals are supplied to the second plurality of digital filters, respectively.
- the output of the plurality of digital filters is supplied to each of the plurality of speakers, and the sound formed at the second point in the sound field among the sounds formed from the outputs of the first plurality of digital filters is controlled.
- a predetermined transfer characteristic is set for each of the second plurality of digital filters.
- an audio signal is supplied to each of a plurality of first digital filters, and outputs of the first plurality of digital filters constitute a first speed power array.
- a sound field is formed by supplying each of the plurality of speeds, and the audio signal is transmitted to the first point in the sound field through the respective speeds of the first plurality of digital filters and the first speaker array.
- a predetermined delay time is set for each of the first plurality of digital filters so that the propagation delay time of each of them reaches the second, and the audio signal is set to the second plurality of digital filters.
- An audio signal reproducing apparatus includes: a first plurality of digital filters to which audio signals are respectively supplied; a second plurality of digital filters to which audio signals are respectively supplied; An output signal of the first plurality of digital filters is supplied to each of the plurality of speakers to form a sound field, and the audio signal is formed by the first plurality of digital filters.
- a predetermined delay time is assigned to each of the first plurality of digital filters so that the propagation delay times until reaching the first point in the sound field via each of the plurality of speeds and the plurality of speech forces match.
- the output of the second plurality of digital filters is supplied to each of the plurality of speakers, and the sound formed from the outputs of the first plurality of digital filters is set. That is, a predetermined transfer characteristic is set for each of the second plurality of digital filters so as to control the sound at the second point in the sound field.
- the audio signal reproducing apparatus further includes a plurality of subtraction circuits to which the outputs of the first plurality of digital filters and the outputs of the second plurality of digital filters are respectively supplied. Supply the output of the circuit to each of the above speakers I do.
- Another audio signal reproducing apparatus includes: a first plurality of digital filters to which audio signals are respectively supplied; a second plurality of digital filters to which audio signals are respectively supplied; A second speaker array in which a plurality of speaker forces are arranged, and a second speaker array in which a plurality of speaker forces are arranged.
- a sound field is formed by supplying to each of a plurality of speeds constituting the first speaker array, and the audio signal is transmitted to the first plurality of digital filters and each of the first speed array.
- a predetermined delay time is set for each of the first plurality of digital filters so that the respective propagation delay times until reaching the first point in the sound field through the speed are the same, Supplying the audio signal to the outputs of the second plurality of digital filters, and supplying the output of the second plurality of digital filters to each of the plurality of speed arrays forming the second speed array; And a predetermined transmission to the second plurality of digital filters so as to control the sound at the second point in the sound field among the sounds formed from the output of the first plurality of digital filters.
- FIG. 1 is a block diagram showing a speaker array constituting a speaker system used for a home theater or an AV system.
- FIG. 2 is a plan view showing a state in which a sound field is formed in a two-channel stereo beaker system.
- FIG. 3 is a plan view showing a state where a virtual image of a sound field is formed in a two-channel stereo speaker system.
- FIG. 4 is a plan view showing a state where a sound field is formed in a four-channel stereo speaker system.
- FIG. 5 is a plan view showing a state where the listener listens to the sound radiated from the four-channel stereo speaker system.
- FIG. 6 is a diagram for explaining a state in which the sound pressure enhancement point Ptg and the sound pressure reduction point P nc are set to a place where a sound field is required by using the speaker array to which the present invention is applied.
- FIG. 7A is a plan view showing the state in which the original sound wave AWL and the leak sound AWnc reach the listener LSNR from the speed array
- Fig. 7B is another view focusing on the position of the listener LSNR from the speaker array
- FIG. 7C is a plan view showing a state in which sound waves AWs are radiated
- FIG. 7C shows a state in which a leak sound AWnc radiated from the speed force array is canceled by a sound wave AWs having an inverse homology level at the position of the listener LSNR. It is a top view.
- FIG. 8 is a block diagram showing an example of a reproducing apparatus to which the present invention is applied.
- FIG. 9 is a block diagram showing another example of the reproducing apparatus to which the present invention is applied.
- FIG. 10 is a block diagram showing an example in which a four-channel stereo playback device is configured using a spin array to which the present invention is applied.
- FIG. 11 is a plan view showing a state in which leakage sound AWnc of the left channel is canceled by radiating sound waves AWs from the speaker array of the right channel.
- FIG. 12 is a plan view showing a sound field of an example in which the speaker arrays 10L and 1OR are configured by one speaker array.
- BEST MODE FOR CARRYING OUT THE INVENTION First, an outline of the present invention will be described with reference to FIG.
- a plurality of speaker forces SP0 to SPn are arranged in a row in the horizontal direction to constitute a speaker array 10, and the speaker array 10 is shown in FIG.
- An example applied to the focus type speaker system shown below will be described.
- the leak sound AW nc at this point Pnc is reduced, but this reduction point Pnc is also the focal point Ptg. That is, the reduction point Pnc of the leak sound AWnc coincides with the focal point Ptg.
- the path of the sound wave AW from the speaker array 10 to the focal point Ptg and the path of the leak sound AWnc are different, so as shown in FIG. 6, the position of the focal point Ptg and the leak sound AWnc reduction points Pnc is different.
- Each of the delay circuits D L0 to D Ln is realized by a FIR (Finite Impulse Response) digital filter. As shown in FIG. 6, the filter coefficients of the FIR digital filters D L0 to D Ln are Let it be represented by the values C F0 to C Fn.
- FIR Finite Impulse Response
- an impulse is input to the FIR digital filter D L0 to D Ln, and the output sound of the speaker array 10 is measured at a point Ptg. Note that this measurement uses the FIR digital filter D L0 ⁇ ! ) Perform at the sampling frequency of the playback system including Ln or higher.
- the response signal measured at the points Ptg and Pnc becomes a sum signal obtained by acoustically adding sounds output from all the speakers SP0 to SPn through the space.
- the signals output from the speakers SP0 to SPn are the impulse signals delayed by the FIR digital filters DLO to DLn.
- the response signal added through the air propagation is referred to as “spatial composite impulse response”.
- the spatial synthesis impulse response Itg measured at the point Ptg is shown in FIG. So, one big impulse will be.
- the frequency response (amplitude part) Ftg of the spatial synthesis impulse response Itg is flat in the entire frequency band because the time waveform is an impulse. Therefore, the point Ptg becomes the focal point where the sound pressure is increased as described above.
- the spatial composite impulse response I is caused by the frequency characteristics of each speaker SP0 to SPn, the frequency characteristics change during spatial propagation, the reflection characteristics of the wall in the middle of the path, the time axis deviation defined by the sampling frequency, etc. tg is not an accurate impulse, but for simplicity, it is shown using an ideal model.
- the spatially combined impulse response Inc measured at the reduction point Pnc is considered to be the synthesis of impulses with time-axis information, and as shown in Fig. 6, a signal in which the impulse is dispersed with a certain width is shown. It can be seen that it is.
- a pulse train in which the impulse responses Inc are arranged at equal intervals is used. The intervals between the pulse trains are not equal.
- This spatially synthesized impulse response Inc can be considered to be a spatial F / R digital filter having filter coefficients C F0s to C Fns as shown in Fig. 6, and a speaker array with the focus at the reduction point Pnc. Can be realized.
- a speaker array using the FIR digital filter is prepared, and the filter coefficients C F0s to C Fns of the FIR digital filter are set to the values shown in Fig. 6, so that the reduction point Pnc 'is focused.
- a spatial synthesis impulse response Inc can be obtained.
- the leak sound A Wnc is reduced, for example, as shown in FIGS. 7A to 7C. 7A to 7C, only the left channel is shown. That is, as shown in FIG. 7A, when the original sound wave AWL and the leak sound AWnc reach the listener LSNR from the speed force array 10 L, the reduction point from the speed force array 10 L as shown in FIG. 7B. Emit another sound wave AW.s focused on Pnc (the location of the listener LSNR).
- the sound wave AWs shown in Fig. 7B has the same frequency characteristics and level as the leak sound AWnc, and has the opposite phase.
- the sound waves AWs are formed by another FIR digital filter having the filter coefficients CF0 s to C Fns in FIG.
- another sound wave AW s whose focal point is the reduction point Pnc (the position of the listener LSNR) from the speaker array 10 L has the same frequency characteristics and level as the leaked sound A Wnc, and has the opposite phase.
- the leak sound AWnc radiated from the speaker array 10 is canceled at the position of the listener LSNR by the sound wave A Ws having an inverse homology level, and the listener LSNR is originally Only the sound wave AWL is heard.
- FIG. 8 shows only the left channel of the 2-channel stereo.
- the left and right channel digital audio signals L and R are extracted from the source SC, and the left channel signal is? 1 IR digital filter Supplied to D F0 to D Fn.
- the FIR digital filters D F0 to D Fn perform a predetermined delay with respect to the audio signal L.
- the sound wave AWL radiated from the speaker array 10 L Listener LS reflected on the wall WLL The delay time is set from 0 to n so that the focal point Ptg is focused on the dish position.
- the setting of the delay times rO to rn is realized by setting the filter coefficients C F0 to C Fn of the FIR digital filters D F0 to D Fn to predetermined values.
- the output signals of the FIR digital filters D F0 to D Fn are supplied to power amplifiers P A0 to P An through subtraction circuits ST 0 to ST ⁇ , and are D / A (Digital to Analog) converted and then power amplified, or Class D amplification is performed, and the amplified output is supplied to the speed SP0 to SPn.
- D / A Digital to Analog
- the digital audio signal from the source SC is supplied to another FIR digital filter D F0s to D Fns, and the filter output is supplied to the subtraction circuit S TO-ST Tn.
- the FIR digital filters D F0s to D Fns have the filter coefficients C F0s to C Fns described with reference to FIGS. 6 and 7, and realize the spatially synthesized impulse response Inc shown in FIG. .
- the outputs of the filters DF0s to DFns are subtracted from the outputs of the filters DF0 to DFn in the subtraction circuit ST0STn.
- the right channel digital audio signal R extracted from the source SC is similarly processed and supplied to the right channel speaker array 1OR.
- the signal supplied to the speed SP0 to SPn through the FIR digital filter D F0 to D Fn is used.
- the original sound wave AWL is radiated from the speaker array 10L, and the sound wave AWL is reflected on the wall surface WLL and then focuses on the position of the listener LS NR as shown in FIG. 7A.
- the spatially synthesized impulse response of this sound wave AWs is determined by setting the filter coefficients C F0s to C Fns. It is made equal to the spatial synthesis impulse response Inc of the leak sound AWnc.
- the outputs of the filters DF0s to DFns are phase-inverted and added to the outputs of the filters DF0 to DFn in the subtraction circuits ST0 to STn.
- the sound wave AWs has the same frequency component as the leak sound AWnc and has the opposite phase, so the leak sound AWnc is canceled by the sound wave AWs. Therefore, as shown in Fig.
- the listener LSNR reaches the original sound wave AWU, but the leak sound AWnc is hardly heard.
- the same operation is performed for the speaker array 10 R. Even if a leak sound is generated in the sound wave AWR radiated from the speed array 10 R, the leak sound is canceled out and hardly perceived by the listener LSNR. become.
- 2′-channel stereo reproduction can be performed by the speaker arrays 1 OL and 10 R arranged in front of the listener LSNR, and at this time, sound leakage A signal equivalent to AWnc is formed, and this signal is subtracted from the original audio signal so that the leaked sound AWnc is not heard by the listener LSNR. Therefore, it is possible to prevent the sound quality from being deteriorated due to the leaked sound AWnc.
- the speaker array 10L emits the original sound wave AWL, as shown in Fig. 7A, when the sound wave AWs is emitted so as to generate the leak sound AWnc, a part of the sound wave AWs is shown in Fig. 7.
- the sound reaches the listener LSNR through the same path as the sound wave AWL shown in A, and this may be a new leak sound.
- the level of the leak sound AWnc is lower than that of the original sound wave AWL, the level of the sound wave AWs for canceling out the leak sound AWnc is also low, and a part of the sound wave A Ws of this low level is a new leak sound. Therefore, the level of this leak sound is sufficiently low and can be ignored.
- the sound wave AWs having the same component and the same level as that of the leak sound AWnc is radiated from a different speaker from the speakers SP0 to SPn to cancel the leak sound AWnc. It is. Also in this example, only the left channel in 2-channel stereo is shown.
- the speaker array 10 includes the first set of speakers SP0 to SPn and the second set of speakers SP0 to SPn. It is composed of a set of speakers SP0s to SPns. Then, the left and right channel digital audio signals L and R are taken out from the source SC, and the left channel signal L is passed through the FIR digital filter D F0 to D Fn and the power amplifier; It is supplied to SP0 to SPn. Further, the left channel signal L from the source SC is supplied to the speakers SP0s to SPns through the FIR digital filters DF0s to DFns and the power amplifiers PA0s to PAns.
- the FIR digital filters DF0 to DFn and DF0s to DFns are the same as in the first embodiment.
- the speakers S P0s to S Pns is opposite in polarity to the connection between the power amplifiers P A0 to P An and the speakers S P0 to S Pn.
- the original sound waves AWL are radiated from the speeds S P0 to S Pn and, for example, as shown in FIG. Connect the dots.
- the leak sound AWnc is generated from the speakers SP0 to SPn.
- the leakage sound AWnc generated by the speakers SP0 to SPn is canceled by the sound wave AWs radiated from the speakers SP0 to SPn.
- AWnc can perform 2-channel stereo playback with sufficiently suppressed.
- FIG. 10 is a case where the four-channel stereo shown in FIG. 4 described above is realized and the leak sound is suppressed. Note that, in this example, only the left front channel and the left rear channel in the four-channel stereo are shown.
- digital audio signals L, LB, R, and RB of the left front, left rear, right front, and right rear channels are extracted from the source SC. Then, for the signal L 'of the left front channel, the FIR digital filters DF0 to DFn, DF0s to DFns and the subtraction circuits ST0 to STn are configured in the same manner as in FIG. STn are supplied to the speakers SP0 to SPn of the left-channel speaker array 10L through the adders AD0 to ADn and further through the power amplifiers PA0 to PAn.
- the FIR digital filters DF0B to DFnB, DF0sB to DFnsB and the subtraction circuits ST0B to STnB are configured in the same manner as those in the left front channel, and the subtraction circuits ST0B to STnB Is supplied to the adder A DO ⁇ ADn.
- the leak sound AWnc, AWnc of the left front channel and the left rear channel based on the audio signals L, LB from the speed array 10 L should be radiated.
- the filters DF Os to DF ns and D FOsB to D FnsB cancel each other and are not heard by the listener LS plate.
- the right front channel and the right rear channel are similarly configured. As shown in FIG. 4, the sound wave A WR of the right front channel and the sound wave AWRB of the right rear channel are radiated from the speaker array 10 R, and the LSNR of the listener LSNR is radiated. Focus on position. So Then, at this time, the leak sounds A Wnc and A Wnc of the right front channel and the right rear channel based on the audio signals R and RB are canceled out, and do not exceed the listener LSNR.
- the leak sound A Wnc of the left channel is canceled out by radiating the sound wave A Ws from the left channel speed force array 10L.
- the left channel leak sound A Wnc can be canceled by radiating sound waves A Ws from the right channel speaker array 1 OR.
- the speaker arrays 10 L and 10 OR may be a single speed array 10.
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- Otolaryngology (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP03758836A EP1571885A1 (en) | 2002-12-09 | 2003-10-23 | Audio signal reproducing method and reproducing apparatus |
US10/532,546 US20050271223A1 (en) | 2002-12-09 | 2003-10-23 | Audio signal reproducing method and reproducing apparatus |
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JP2002356139A JP3821229B2 (ja) | 2002-12-09 | 2002-12-09 | オーディオ信号の再生方法および再生装置 |
JP2002-356139 | 2002-12-09 |
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US (1) | US20050271223A1 (ja) |
EP (1) | EP1571885A1 (ja) |
JP (1) | JP3821229B2 (ja) |
KR (1) | KR20050083765A (ja) |
CN (1) | CN1714601A (ja) |
WO (1) | WO2004054321A1 (ja) |
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US9803293B2 (en) | 2008-02-25 | 2017-10-31 | Sixpoint Materials, Inc. | Method for producing group III-nitride wafers and group III-nitride wafers |
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JP4349123B2 (ja) | 2003-12-25 | 2009-10-21 | ヤマハ株式会社 | 音声出力装置 |
JP2005197896A (ja) * | 2004-01-05 | 2005-07-21 | Yamaha Corp | スピーカアレイ用のオーディオ信号供給装置 |
JP4161906B2 (ja) * | 2004-01-07 | 2008-10-08 | ヤマハ株式会社 | スピーカ装置 |
JP4251077B2 (ja) * | 2004-01-07 | 2009-04-08 | ヤマハ株式会社 | スピーカ装置 |
JP3915804B2 (ja) | 2004-08-26 | 2007-05-16 | ヤマハ株式会社 | オーディオ再生装置 |
JP4779381B2 (ja) | 2005-02-25 | 2011-09-28 | ヤマハ株式会社 | アレースピーカ装置 |
JP5401760B2 (ja) * | 2007-02-05 | 2014-01-29 | ソニー株式会社 | ヘッドフォン装置、音声再生システム、音声再生方法 |
GB0821999D0 (en) * | 2008-12-02 | 2009-01-07 | Pss Belgium Nv | Method and apparatus for improved directivity of an acoustic antenna |
KR101295849B1 (ko) * | 2008-12-18 | 2013-08-12 | 삼성전자주식회사 | 음향 방사 패턴 제어 장치 및 방법 |
CA2941646C (en) * | 2009-10-05 | 2019-09-10 | Harman International Industries, Incorporated | Multichannel audio system having audio channel compensation |
JP6216553B2 (ja) * | 2013-06-27 | 2017-10-18 | クラリオン株式会社 | 伝搬遅延補正装置及び伝搬遅延補正方法 |
JP6258089B2 (ja) * | 2014-03-18 | 2018-01-10 | 株式会社東芝 | スピーカシステム |
KR101525207B1 (ko) * | 2014-11-24 | 2015-06-04 | 가락전자 주식회사 | 오디오 스트림 사이의 신호 동기화 방법 |
WO2016085011A1 (ko) * | 2014-11-24 | 2016-06-02 | 가락전자 주식회사 | 오디오 스트림 사이의 신호 동기화 방법 |
CN108141687B (zh) | 2015-08-21 | 2021-06-29 | Dts(英属维尔京群岛)有限公司 | 用于泄漏消除的多扬声器方法和装置 |
CN109196581B (zh) * | 2016-05-30 | 2023-08-22 | 索尼公司 | 局部静音声场形成设备和方法以及程序 |
US10531196B2 (en) * | 2017-06-02 | 2020-01-07 | Apple Inc. | Spatially ducking audio produced through a beamforming loudspeaker array |
CN112135225B (zh) * | 2019-06-25 | 2023-11-21 | 海信视像科技股份有限公司 | 扬声器***和电子设备 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03159500A (ja) * | 1989-11-17 | 1991-07-09 | Nippon Hoso Kyokai <Nhk> | 立体音響再生方法 |
JPH0819084A (ja) * | 1994-06-30 | 1996-01-19 | Kenwood Corp | スピーカシステム |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0160431B1 (en) * | 1984-04-09 | 1990-09-19 | Pioneer Electronic Corporation | Sound field correction system |
US5870484A (en) * | 1995-09-05 | 1999-02-09 | Greenberger; Hal | Loudspeaker array with signal dependent radiation pattern |
US5815578A (en) * | 1997-01-17 | 1998-09-29 | Aureal Semiconductor, Inc. | Method and apparatus for canceling leakage from a speaker |
WO2002078388A2 (en) * | 2001-03-27 | 2002-10-03 | 1... Limited | Method and apparatus to create a sound field |
-
2002
- 2002-12-09 JP JP2002356139A patent/JP3821229B2/ja not_active Expired - Fee Related
-
2003
- 2003-10-23 EP EP03758836A patent/EP1571885A1/en not_active Withdrawn
- 2003-10-23 KR KR1020057006483A patent/KR20050083765A/ko not_active Application Discontinuation
- 2003-10-23 CN CNA2003801040063A patent/CN1714601A/zh active Pending
- 2003-10-23 WO PCT/JP2003/013574 patent/WO2004054321A1/ja active Application Filing
- 2003-10-23 US US10/532,546 patent/US20050271223A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03159500A (ja) * | 1989-11-17 | 1991-07-09 | Nippon Hoso Kyokai <Nhk> | 立体音響再生方法 |
JPH0819084A (ja) * | 1994-06-30 | 1996-01-19 | Kenwood Corp | スピーカシステム |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9803293B2 (en) | 2008-02-25 | 2017-10-31 | Sixpoint Materials, Inc. | Method for producing group III-nitride wafers and group III-nitride wafers |
Also Published As
Publication number | Publication date |
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KR20050083765A (ko) | 2005-08-26 |
JP2004193698A (ja) | 2004-07-08 |
JP3821229B2 (ja) | 2006-09-13 |
EP1571885A1 (en) | 2005-09-07 |
US20050271223A1 (en) | 2005-12-08 |
CN1714601A (zh) | 2005-12-28 |
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