CN1175708C - Speaker device - Google Patents

Abstract

The present invention relates to a loudspeaking device which can stably obtain the desired direction through the combination of omnidirectionality and bidirectionality in full frequency including ultralow frequency. A loudspeaker (22) is arranged on one end surface of a sound box (21). A circular acoustic wave transmission opening (23) covered by acoustic resistance material (24) is arranged on the other end surface of the sound box (21). Air vibration generated at the back surface of a vibrating plate of the loudspeaker is used as acoustic waves to be transmitted to the outside by the acoustic wave transmission opening, and extends through a central shaft in the direction of a main shaft (reference shaft) of the loudspeaker (22). A low-frequency filter is formed from the acoustic resistance and the acoustic quality of the acoustic wave transmission opening (23) and the acoustic capacitance presented by the air in the sound box. The directivity is obtained by utilizing the group delay time of the acoustic waves transmitted from the acoustic wave transmission opening (23) by the low-frequency filter in the passband. The optional group delay time can be set irrespective of the dimensions and the shapes of the sound box (21), and the desired directionality can be stably obtained in full frequency including ultralow frequency. By utilizing the directivity, the present invention can correct the acoustic pressure level difference generated by the different attenuation of a right sound track and a left sound track along with the distance, and expand the listening range with good stereophonic effect.

Description

Loudspeaker arrangement

Technical field

The present invention relates to loudspeaker arrangement, this loudspeaker arrangement is until ultralow frequency, can both stably have the desirable directivity that obtains by isotropic directivity and amphitropic combination, the scope of listening to that obtains good three-dimensional phonoreception with less system configuration can be enlarged in addition, the scope of listening to that obtains good surround sound effect can also be enlarged.

Background technology

So far, as loudspeaker arrangement, known that hermetic type arranged and back style of opening.Here, the directional characteristic of low frequency is isotropic directivity in the loudspeaker arrangement of hermetic type, is the amphicheirality in the back in the Kai Fangxing loudspeaker arrangement.In addition, under the situation of the medium-high frequency that loudspeaker arrangement can not be regarded as desirable point sound source, itself just has directivity the loudspeaker arrangement emitting sound wave.In other words, in existing loudspeaker arrangement, can only obtain isotropic directivity or amphicheirality as the directional characteristic of low frequency.

In addition, Figure 28 represents that existing stereo loudspeaker arrangement is configured in the state in the listening room 100.This loudspeaker arrangement is made of with loudspeaker arrangement 1R with loudspeaker arrangement 1L and R channel L channel, L channel has the voice signal regeneration loudspeaker arrangement that can make the regeneration of L channel voice signal with loudspeaker arrangement 1L, and R channel has the voice signal regeneration loudspeaker arrangement that can make the right channel sound signal regeneration with loudspeaker arrangement 1R.

If use such loudspeaker arrangement, then on the center line M of loudspeaker arrangement 1L, 1R listen to the position, for example at a point, basically the correct phonotape and videotape location between loudspeaker arrangement 1L, the 1R can be obtained, therefore the original stereo stage of stereophony can be reproduced., beyond the center line M listen to the position, for example at the b point, owing to the sound wave equal reason that decay on distance, the phonotape and videotape location becomes the direction of being partial to loudspeaker arrangement 1R, can not reproduce the original stereo stage of stereophony.

That is, in Figure 28, if with the voice signal of identical signal excitation loudspeaker arrangement 1L, 1R regeneration loudspeaker arrangement, then the phonotape and videotape of position, for example a putting of listening on the center line M of loudspeaker arrangement 1L, 1R is positioned at the central the place ahead shown in the arrow.Therefore, if make common stereophonic signal regeneration, then can between loudspeaker arrangement 1L, 1R, reproduce continuous stereo stage (representing with chain-dotted line La among the figure).

Here, about the phonotape and videotape of stereophony sound equipment location, following character arranged acoustically known.If existence is poor from the sound pressure level of the sound wave of loudspeaker arrangement 1L, 1R, then the phonotape and videotape of listening to position, for example a point on the center line M of loudspeaker arrangement 1L, 1R will move to the direction of the high loudspeaker arrangement of sound pressure level.In addition, no matter the signal of the voice signal regeneration usefulness loudspeaker arrangement of excitation loudspeaker arrangement 1L, 1R how, if produce the time of delay of 1～30ms, then the direction of the loudspeaker arrangement that will early arrive in time to sound wave of the phonotape and videotape of listening to position, for example a point on the center line M of loudspeaker arrangement 1L, 1R moves.This phenomenon is called as effect in advance, and this is known.

On the basis of this character acoustically, investigate the center line M phonotape and videotape location of listening to position, for example b point in addition of loudspeaker arrangement 1L, 1R.At this b point because the radio reception point is different with the distance of loudspeaker arrangement 1L, 1R, so be under the situation of isotropic directivity in the directivity of loudspeaker arrangement 1L, 1R, in from the sound wave of loudspeaker arrangement 1L, 1R generation poor the time of advent, it is poor to produce sound pressure level simultaneously.That is, from time of advent of the sound wave of loudspeaker arrangement 1R early, from the sound pressure level height of the sound wave of loudspeaker arrangement 1R.

Therefore, the phonotape and videotape of listening to position, for example b point beyond the center line M of loudspeaker arrangement 1L, 1R except above-mentioned sound pressure level difference and the effect in advance by the time difference generation, shown in the arrow among Figure 28, is partial to the direction location of loudspeaker arrangement 1R significantly.Therefore, the stereo stage the during regeneration of common stereophonic signal is partial to loudspeaker arrangement 1R one side (representing with two chain-dotted line L6 among the figure).

Propose to utilize the method for the directivity of loud speaker to improve the problem of the deflection of above-mentioned stereo stage so far, proposed to seek to enlarge the renovation process of the stereophony sound equipment of listening to the position that can obtain good three-dimensional phonoreception in other words.Figure 29 regenerates the voice signal of loud speaker 1L, 1R to be installed among closed box 3L, the 3R with loud speaker 2L, 2R, and listen to the position from central authorities, make separately main shaft (reference axis) towards about 45 ° with interior direction, this is that a kind of vibrating plate based on loud speaker 2L, 2R has limited area and utilizes the method for the directivity of the medium-high frequency that loud speaker itself had.In addition, Figure 30 is to use voice signal regeneration loudspeaker arrangement 4L, the 4R of amphicheirality's's (directivity of 8 fonts) loud speaker as the medium-high frequency of taking on loudspeaker arrangement 1L, 1R, simultaneously loudspeaker arrangement 4L, 4R are installed on reflecting plate 6L, the 6R in case 5L, the 5R of open at its front, and listen to the position from central authorities, make separately main shaft towards about 45 ° with interior direction.In addition, solid line a _L, a _RThe directivity of representing loudspeaker arrangement 4L, 4R respectively.

If adopt Figure 29 and example shown in Figure 30, then because the emission sound wave of loudspeaker arrangement 1L, 1R has directivity, listen to position, for example b point (with reference to Figure 28) beyond the center line M, sound pressure level from the sound wave of loudspeaker arrangement 1R descends, some rising of sound pressure level from the L channel of loudspeaker arrangement 1L, based on about the sound wave of two sound channels with the difference of range attenuation, the sound pressure level difference moves towards the direction that is corrected, and has enlarged the position of listening to that can obtain good three-dimensional phonoreception.

,, suppose to make lower frequency have directivity, just need to use bigbore loudspeaker arrangement 2L, 2R, make the structure of system become big if adopt example shown in Figure 29.In addition, if adopt example shown in Figure 30, suppose that the low frequency boundary of reproduction band is wide, just need to increase the reflecting plate 6L6R that loudspeaker arrangement 4L, 4R are installed, with shown in Figure 29 routine the same, the structure change of system greatly.

In addition, Figure 31 represents that existing front surround sound loudspeaker arrangement is configured in the state in the listening room 100.This loudspeaker arrangement is made of with loudspeaker arrangement 11R with loudspeaker arrangement 11L and R channel L channel.For example, loudspeaker arrangement 11L has the voice signal regeneration loud speaker that makes left voice signal regeneration, the surround sound signal regeneration loud speaker that makes the surround sound signal regeneration is arranged simultaneously, loudspeaker arrangement 11R has the voice signal regeneration that makes right voice signal regeneration to use loud speaker, and the surround sound signal regeneration loud speaker that makes the surround sound signal regeneration is arranged simultaneously.

In the case, the surround sound signal regeneration is so mounted in the audio amplifier with loud speaker, that is, its main shaft constitutes the direction beyond the predetermined angular towards the frontal of audio amplifier or with respect to its frontal.The main shaft of voice signal regeneration loudspeaker arrangement 12L, the 12R of Figure 31 and loudspeaker arrangement 11L, 11R is towards the frontal F of audio amplifier 14L, 14R _L, F _RThe same, representative ring is around the main shaft SA of stereophonic signal regeneration with loudspeaker arrangement 13L, 13R _L, SA _RAlso towards frontal F _L, F _RExample.In addition, the main shaft of the voice signal of Figure 32 and loudspeaker arrangement 11L, 11R regeneration loudspeaker arrangement 12L, 12R is towards the frontal F of audio amplifier 14L, 14R _L, F _RDifference, it is that representative ring is around the main shaft SA of stereophonic signal regeneration with loud speaker 13L, 13R _L, SA _RTowards with respect to frontal F _L, F _RConstitute the example of predetermined angular δ direction in addition.

In front surround sound loudspeaker arrangement shown in Figure 31, on the center line M of loudspeaker arrangement 11L, 11R listen to the position, for example under the situation that the e point is listened to, though can obtain original surround sound effect, but for example beyond the center line M listen to the position, for example under the situation that f point is listened to, have the significantly shortcoming of decline of surround sound effect.Below, Yi Bian the principle of dual track front surround sound regenerative system is described, Yi Bian the reason that position ring so significantly descends around stereophonic effect of listening to beyond center line M is described.

This front surround sound regenerative system is the system that utilizes two loudspeaker arrangements (loudspeaker arrangement that left and right acoustic channels is used) acquisition surround sound effect in the place ahead, not only can both produce phonotape and videotape forwardly but also at horizontal or rear, presenting the stereo stage of wide-angle sensuously, is a kind of system that can give such sensation of for example listening to the music in big arenas.Therefore, the front surround-sound system is a kind of simulation stereo system regenerative system that utilizes the sense of hearing, is different from the traditional multichannel stereo system regenerative system that presents three-dimensional actual sound field at auditory space.

At first, two channel stereo signal is by constituting as the M signal component of single signal and the S signal component of the direction that provides the phonotape and videotape location.That is, the L signal of L channel (left voice signal) is M, S two component sums, L=M+S in other words, and the R signal of R channel (right voice signal) is the poor of M, S two components, R=M-S in other words.Therefore, the S signal component is nothing but the signal of the difference of L signal and R signal, is its size and the different and different signals of polarity with the direction of phonotape and videotape location.

Promptly, e point place on the center line M of loudspeaker arrangement 11L, 11R in Figure 31, when phonotape and videotape is positioned central the place ahead, the S signal component is zero, when only M signal component or phonotape and videotape are positioned central the place ahead and take back, the polarity of S signal component just is identical positive polarity with the M signal component, and when phonotape and videotape was positioned central the place ahead and takes in addition, the polarity of S signal component was the polarity different with the M signal component.Therefore, as S=± S ₀The time, under the situation that is positioned to take back in central the place ahead at phonotape and videotape, L=M+ (+S ₀)=M+S ₀, R=M-(+S ₀)=M-S ₀, i.e. L＞R, under phonotape and videotape is positioned situation that central the place ahead takes over, L=M+ (S ₀)=M-S ₀, R=M-(S ₀)=M+S ₀, i.e. L＜R.

Secondly, in the surround sound regenerative system of front, except the original L of stereophony, R signal, make based on the polarity of the S signal component in the surround sound signal of S signal component and L, the R signal consistent, and overlap on L, the R signal and regenerate, perhaps adopt the method for using special-purpose loud speaker to regenerate.The surround sound signal is basically based on the S signal component, but in order to obtain more real-time surround sound effect, can carry out time delay to the S signal component, reverberation is additional or strengthen specific signal processing such as frequency component.In other words, surround sound regenerative system in front is basically nothing more than being the system that the S signal component that comprises in original L, the R signal is carried out appropriate signals processing, further enhancing regeneration.By adopting such renovation process, on the center line M of loudspeaker arrangement 11L, 11R in Figure 31 listen to the position, for example at e point place, can obtain the stereophonic effect of being attempted.

Here, the physics sound equipment condition of the regeneration sound of listening to position, for example e point on the center line M of loudspeaker arrangement 11L, 11R is: all equate from the size of each signal tone component of M, the S of loudspeaker arrangement 11L, 11R emission and surround sound, and arrive at synchronization.This condition is sensuously reproduce continuous stereo stage that is produced by M, S two signal tone components and the surround sound effect conditions needed of being attempted by the generation of surround sound signal tone component between loudspeaker arrangement 11L, 11R, is extremely important., on the center line M of loudspeaker arrangement 11L, 11R in Figure 31 listen to the position, for example at f point place, in the regeneration sound of loudspeaker arrangement 11L, 11R, produce level difference and time difference, do not satisfy above-mentioned condition.

In addition, when using special-purpose loud speaker 13L, 13R (with reference to Figure 32 and Figure 33) regeneration surround sound signal, from the center line M of loudspeaker arrangement 11L, 11R listen to the position, for example from the e point, the main shaft SA of loud speaker 13L, 13R _L, SA _RTowards frontal or direction toward the outer side.As such surround sound signal regeneration with loud speaker 13L, 13R, the miniature loudspeaker about can using bore as 8cm generally speaking.At bore is under the situation of the miniature loudspeaker about 8cm, and as shown in figure 34, approximately from frequency 1kHz, the directivity relevant with the size of bore begins to show, and frequency high directivity more is strong more.

Therefore, the surround sound signal tone of listening to position, for example f point beyond the center line M of loudspeaker arrangement 11L, 11R among Figure 31, owing to the direction of loudspeaker arrangement 11L, 11R is different with range attenuation with sound wave with the different directivity that cause of distance, so R channel one side is big, L channel one side is little.Particularly in the surround sound signal regeneration with the main shaft of loud speaker 13L, 13R (with reference to Figure 33) under the situation of direction toward the outer side, the level difference that is produced by the directivity of the surround sound signal tone of left and right acoustic channels is remarkable all the more.Therefore, as mentioned above, the surround sound effect of listening to position, for example f point beyond the center line M of loudspeaker arrangement 11L, 11R among Figure 31 significantly descends.

In view of the above-mentioned problems, the object of the present invention is to provide a kind ofly by isotropic directivity and amphitropic combination, the desirable directivity that makes acquisition is until all stable loudspeaker arrangement of ultralow frequency.In addition, another object of the present invention is to provide a kind of stereo loudspeaker arrangement that can enlarge the scope of listening to that can obtain good three-dimensional phonoreception with less system.In addition, a further object of the present invention is to provide a kind of front surround sound loudspeaker arrangement that can enlarge the scope of listening to that can obtain good surround sound effect.

Summary of the invention

Stereo loudspeaker arrangement of the present invention is made of with loudspeaker arrangement with loudspeaker arrangement and R channel L channel, above-mentioned L channel has first loud speaker that makes the regeneration of L channel voice signal with loudspeaker arrangement, above-mentioned R channel has second loud speaker that makes the right channel sound signal regeneration with loudspeaker arrangement, in above-mentioned loudspeaker arrangement, first part of raising one's voice that constitutes with above-mentioned first loud speaker of loudspeaker arrangement by above-mentioned L channel, and with second part of raising one's voice that above-mentioned second loud speaker of loudspeaker arrangement constitutes directivity is arranged all by above-mentioned R channel, this directivity is that the combination of the amphicheirality by having peak response on the main shaft of the place ahead of loud speaker and isotropic directivity respectively obtains, above-mentioned L channel is installed in the audio amplifier respectively with first loud speaker of loudspeaker arrangement and above-mentioned R channel second loud speaker with loudspeaker arrangement, and makes main shaft separately reach clockwise direction first angle that tilts respectively in the counterclockwise direction with respect to the frontal of audio amplifier.For above-mentioned L channel with first of the loudspeaker arrangement part of raising one's voice, and by above-mentioned R channel with above-mentioned second of the loudspeaker arrangement part of raising one's voice, respectively loud speaker is installed on the end face of audio amplifier, on the end face different, be provided with simultaneously the sound wave emission port that utilizes sound-resistance material to cover with an above-mentioned end face of above-mentioned audio amplifier, the acoustic capacitance that presents by the air in the above-mentioned audio amplifier, the acoustic resistance of above-mentioned sound wave emission port, and acoustic mass constitutes the low-frequency filter of sound equipment, utilize by above-mentioned low-frequency filter from the above-mentioned group delay time of sound wave emission port emitting sound wave in passband, making from the front of above-mentioned loud speaker and the synthetic sound pressing element of these two sound source emitting sound wave of sound wave emission port has directivity, and this directivity is to obtain by isotropic directivity that has peak response on the main shaft of the place ahead of above-mentioned loud speaker and amphitropic combination.

In addition, stereo loudspeaker arrangement of the present invention is made of with loudspeaker arrangement with loudspeaker arrangement and R channel L channel, above-mentioned L channel has first and second loud speaker that makes the regeneration of L channel voice signal with loudspeaker arrangement, above-mentioned R channel has the 3rd and the 4th loud speaker that makes the right channel sound signal regeneration with loudspeaker arrangement, in above-mentioned loudspeaker arrangement, first part of raising one's voice that constitutes with above-mentioned second loud speaker of loudspeaker arrangement by above-mentioned L channel, and with second part of raising one's voice that above-mentioned the 4th loud speaker of loudspeaker arrangement constitutes directivity is arranged all by above-mentioned R channel, this directivity is that the combination of the amphicheirality by having peak response on the main shaft of the place ahead of loud speaker and isotropic directivity respectively obtains, above-mentioned L channel is installed in the audio amplifier with above-mentioned first loud speaker of loudspeaker arrangement and above-mentioned R channel respectively with above-mentioned the 3rd loud speaker of loudspeaker arrangement, and make main shaft separately consistent with the frontal of audio amplifier, above-mentioned L channel is installed in the audio amplifier respectively with above-mentioned second loud speaker of loudspeaker arrangement and above-mentioned R channel above-mentioned the 4th loud speaker with loudspeaker arrangement, and makes main shaft separately reach clockwise direction first angle that tilts respectively in the counterclockwise direction with respect to the frontal of audio amplifier.

Listen to the position from the center line of two loudspeaker arrangements, constitute make L channel with and the main shaft of the loud speaker of first and second part of raising one's voice of the voice signal regeneration of the loudspeaker arrangement used of R channel towards the inboard.Therefore, the directivity that the combination of utilization by first and second the raise one's voice amphicheirality that has of part and isotropic directivity obtains, can on the center line that leaves two loudspeaker arrangements listen to position correction by about two sound channels poor with the sound pressure level that the difference of range attenuation causes, can enlarge the scope of listening to that obtains good three-dimensional phonoreception.

Stereo loudspeaker arrangement of the present invention is made of with loudspeaker arrangement with loudspeaker arrangement and R channel L channel, above-mentioned L channel has first loud speaker that makes the regeneration of L channel voice signal and second loud speaker that makes the surround sound signal regeneration with loudspeaker arrangement, above-mentioned R channel has the 3rd loud speaker that makes the right channel sound signal regeneration and the 4th loud speaker that makes the surround sound signal regeneration with loudspeaker arrangement, in above-mentioned loudspeaker arrangement, above-mentioned L channel is installed in the audio amplifier with above-mentioned first loud speaker of loudspeaker arrangement and above-mentioned R channel above-mentioned the 3rd loud speaker with loudspeaker arrangement, and make main shaft separately reach clockwise direction first angle that tilts respectively in the counterclockwise direction with respect to the frontal of audio amplifier, above-mentioned L channel is installed in the audio amplifier with above-mentioned second loud speaker of loudspeaker arrangement and above-mentioned R channel above-mentioned the 4th loud speaker with loudspeaker arrangement, and making separately main shaft reach clockwise direction respectively in the counterclockwise direction with respect to the frontal of audio amplifier tilts and the second identical or different angle of above-mentioned first angle, first part of raising one's voice that constitutes with above-mentioned first loud speaker of loudspeaker arrangement by above-mentioned L channel, and second raise one's voice that directivity, this directivity are all arranged is that the amphicheirality by having peak response on the main shaft of the place ahead of loud speaker and the combination of isotropic directivity respectively obtain to part with what above-mentioned the 3rd loud speaker of loudspeaker arrangement constituted by above-mentioned R channel.

In addition, stereo loudspeaker arrangement of the present invention is made of with loudspeaker arrangement with loudspeaker arrangement and R channel L channel, above-mentioned L channel has first and second loud speaker that makes the regeneration of L channel voice signal and the 3rd loud speaker that makes the surround sound signal regeneration with loudspeaker arrangement, above-mentioned R channel has the 4th and the 5th loud speaker that makes the right channel sound signal regeneration and the 6th loud speaker that makes the surround sound signal regeneration with loudspeaker arrangement, in above-mentioned loudspeaker arrangement, above-mentioned L channel is installed in the audio amplifier with above-mentioned first loud speaker of loudspeaker arrangement and above-mentioned R channel above-mentioned the 4th loud speaker with loudspeaker arrangement, and make main shaft separately consistent with the frontal of audio amplifier, above-mentioned L channel is installed in the audio amplifier with above-mentioned second loud speaker of loudspeaker arrangement and above-mentioned R channel above-mentioned the 5th loud speaker with loudspeaker arrangement, and make main shaft separately reach clockwise direction first angle that tilts respectively in the counterclockwise direction with respect to the frontal of audio amplifier, above-mentioned L channel is installed in the audio amplifier with above-mentioned the 3rd loud speaker of loudspeaker arrangement and above-mentioned R channel above-mentioned the 6th loud speaker with loudspeaker arrangement, and making separately main shaft reach clockwise direction respectively in the counterclockwise direction with respect to the frontal of audio amplifier tilts and the second identical or different angle of above-mentioned first angle, first part of raising one's voice that constitutes with above-mentioned second loud speaker of loudspeaker arrangement by above-mentioned L channel, and second raise one's voice that directivity, this directivity are all arranged is that the amphicheirality by having peak response on the main shaft of the place ahead of loud speaker and the combination of isotropic directivity respectively obtain to part with what above-mentioned the 5th loud speaker of loudspeaker arrangement constituted by above-mentioned R channel.

Listen to the position from the center line of two loudspeaker arrangements, constitute make L channel with and the main shaft of the loud speaker of first and second part of raising one's voice of the voice signal regeneration of the loudspeaker arrangement used of R channel towards the inboard.Therefore, the directivity that the combination of utilization by first and second the raise one's voice amphicheirality that has of part and isotropic directivity obtains, can on the center line that leaves two loudspeaker arrangements listen to position correction by about two sound channels poor with the sound pressure level that the difference of range attenuation causes, can enlarge the scope of listening to that obtains good three-dimensional phonoreception.In addition, listen to the position from the center line of two loudspeaker arrangements, constitute make L channel with and the main shaft of the 3rd and the 6th loud speaker of the surround sound signal regeneration of the loudspeaker arrangement used of R channel towards the inboard.Therefore, utilization makes the directivity of the loud speaker medium-high frequency of surround sound signal regeneration, can revise by about the level difference that causes with the difference of range attenuation of the surround sound signal tone of two sound channels, simultaneously, can also further enlarge the scope of listening to that obtains good surround sound effect except enlarging the listening to the scope of tut signal (LR signal) regeneration sound.

The simple declaration of accompanying drawing

Fig. 1 is the perspective view of expression loudspeaker arrangement of the present invention.

Fig. 2 is the circuit connection diagram of equivalent electric circuit of the mechanical system of expression loudspeaker arrangement.

Fig. 3 is the figure that the theory analysis of synthetic acoustic pressure is used.

Fig. 4 is the figure of the directional characterisitic of expression when α is changed.

Fig. 5 is the figure of expression by the variation of the direction frequency characteristic of β value decision.

Fig. 6 is the figure of the directional characterisitic of expression when β is changed.

Fig. 7 is the figure of the output sound pressure frequency characteristic of expression loudspeaker arrangement.

Fig. 8 is the perspective view of expression stereo loudspeaker arrangement of the present invention.

Fig. 9 is the figure of major axes orientation of the loud speaker of the expression voice signal regeneration that makes loudspeaker arrangement shown in Figure 8.

Figure 10 is the perspective view of the loudspeaker arrangement that uses in the hearing test of expression loudspeaker arrangement shown in Figure 8.

Figure 11 is the figure of usefulness such as result of the hearing test of explanation loudspeaker arrangement shown in Figure 8.

Figure 12 is the perspective view of expression stereo loudspeaker arrangement of the present invention.

Figure 13 is the figure of major axes orientation of the loud speaker of the expression voice signal regeneration that makes loudspeaker arrangement shown in Figure 12.

Figure 14 is the perspective view of the loudspeaker arrangement that uses in the hearing test of expression loudspeaker arrangement shown in Figure 12.

Figure 15 is the figure of usefulness such as result of the hearing test of explanation loudspeaker arrangement shown in Figure 12.

Figure 16 is the perspective view of expression stereo loudspeaker arrangement of the present invention.

Figure 17 is the figure of major axes orientation of the loud speaker of the expression voice signal, the surround sound signal regeneration that make loudspeaker arrangement shown in Figure 16.

Figure 18 is the perspective view of the middle loudspeaker arrangement that uses of hearing test (surround sound effect) of expression loudspeaker arrangement shown in Figure 16.

Figure 19 is the figure of usefulness such as result of the hearing test (surround sound effect) of explanation loudspeaker arrangement shown in Figure 16.

Figure 20 is the perspective view of expression stereo loudspeaker arrangement of the present invention.

Figure 21 is the figure of major axes orientation of the loud speaker of the expression voice signal, the surround sound signal regeneration that make loudspeaker arrangement shown in Figure 20.

Figure 22 is the perspective view of expression front of the present invention surround sound loudspeaker arrangement.

Figure 23 is the figure of major axes orientation of the loud speaker of the expression surround sound signal regeneration that makes loudspeaker arrangement shown in Figure 22.

Figure 24 is the perspective view of the loudspeaker arrangement that uses in the hearing test of expression loudspeaker arrangement shown in Figure 22.

Figure 25 is result's etc. the figure of the hearing test of explanation loudspeaker arrangement shown in Figure 22.

Figure 26 is the perspective view of expression front of the present invention surround sound loudspeaker arrangement.

Figure 27 is the figure of major axes orientation of the loud speaker of the expression surround sound signal regeneration that makes loudspeaker arrangement shown in Figure 26.

Figure 28 is the figure that explanation surround sound loudspeaker arrangement is used.

Figure 29 is that expression enlarges the illustration that the scope of listening to can obtain good three-dimensional phonoreception is used.

Figure 30 is that expression enlarges another illustration that the scope of listening to can obtain good three-dimensional phonoreception is used.

Figure 31 is the figure of the existing front of expression surround sound loudspeaker arrangement.

Figure 32 is that representative ring is around the stereophonic signal regeneration illustration of the main shaft of loud speaker towards frontal.

Figure 33 is a representative ring around stereophonic signal regeneration with the main shaft of the loud speaker illustration of direction toward the outer side.

Figure 34 is the output acoustic pressure direction frequency characteristic illustration of expression loud speaker.

The optimal morphology of the usefulness that carries out an invention

Fig. 1 represents the loudspeaker arrangement 20 as optimal morphology.Loud speaker 22 is installed on the end face of rectangular-shaped audio amplifier 21, is provided with the circular sound wave emission port (opening portion) 23 that covers with sound-resistance material 24 at the end face (above among the figure) different with this end face simultaneously.This sound wave emission port 23 is used for the air vibration that the back side from speaker diaphragm produces is transmitted into the outside as sound wave, and the axle that connects its center extends along the direction of the main shaft (reference axis) of loud speaker 22.

The equivalent electric circuit that the electrical system and the sound system of loudspeaker arrangement 20 is transformed into mechanical system equivalently is at the medium and low frequency band, as shown in Figure 2.Among the figure, F is the vibromotive force that makes the vibrating reed vibration, uses the constant voltage exciting, as the formula (1).

$F=\frac{\mathrm{BlE}}{\mathrm{Rv}}\·\·\·\left(1\right)$

E: the driving voltage of voice coil loudspeaker voice coil

Rv: the resistance of voice coil loudspeaker voice coil

Bl: force coefficient

B: the magnetic flux density in magnetic flux gap

L: the effective length of voice coil loudspeaker voice coil

s ₀Be the equivalent strength of the support elastic body of vibrating reed, r ₀Be the equivalent mechanical resistance that comprises electromagnetic braking resistance, m ₀It is the effective mass of vibrating reed.s ₁Be the equivalent strength after elasticity with air in the audio amplifier is converted into the area of vibrating reed, the volume of establishing the air in the audio amplifier is V, and the effective area of vibrating reed is A, and available (2) formula is represented.

${\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="C9718132100451.png,C9718132100461.png"\; state="\{\{state\}\}">s</figure-callout>}}_1=\frac{\mathrm{\&rho;}{c}^2{A}^2}{V}\&CenterDot;\&CenterDot;\&CenterDot;\left(2\right)$

ρ: the density of air

C: velocity of sound

r ₁Be the equivalent mechanical resistance after acoustic resistance with the sound-resistance material 24 of sound wave emission port 23 is converted into the area of vibrating reed, m ₁Be that the acoustic mass relevant with the sound wave emission with the structure of sound wave emission port 23 is converted into equivalent mass behind the area of vibrating reed.V ₁Be the vibration velocity of vibrating reed, V ₂It is the equivalent vibration velocity after air vibration speed with sound wave emission port 23 is converted into the area of vibrating reed.

In addition, in above-mentioned loudspeaker arrangement 20, have the emission resistance respectively in vibrating reed one side and sound wave emission port 23 1 sides of loud speaker 22, the power of supplying with this emission resistance as the sound equipment power emission in air., emission resistance and r ₀, r ₁Comparing, is minimum value, to V ₁, V ₂Not influence, thus in equivalent electric circuit shown in Figure 2 with its omission.

Secondly, with Fig. 3 the synthetic sound from two sound source emitting sound wave of the front (front of speaker diaphragm) of loud speaker 22 and sound wave emission port 23 is compressed into capable theory analysis.Here, front and the space length of sound wave emission port 23 on the major axes orientation of the loud speaker 22 of two sound sources of establishing loud speaker 22 is d.In addition, be conceived to from the front of loud speaker 22 and the durection component of two sound source emitting sound wave in horizontal plane of sound wave emission port 23, if the direction of main shaft in the loud speaker front is 0 °, and establishes the angle that main shaft and the direction (direction of radio reception position) had in mind constitute and be the θ angle in the counterclockwise direction.

Among the figure, be to be that the front of loud speaker 22 and sound wave emission port 23 these two sound sources can be regarded point sound source as under the situation more than the 1m under the situation of medium and low frequency apart from r between 8～10cm, radio reception position and the loud speaker 22 at d.In addition, roughly regarding the sound wave of radio reception position as plane wave also has no relations.

After handling like this, because the vibration velocity of vibrating reed is V ₁So, from the front emitting sound wave of loud speaker 22 acoustic pressure P in the radio reception position ₁Available (2) formula is represented.

${\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="C9718132100451.png,C9718132100461.png"\; state="\{\{state\}\}">P</figure-callout>}}_1=\frac{\mathrm{j\&omega;\&rho;A}{\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="C9718132100451.png,C9718132100461.png"\; state="\{\{state\}\}">V</figure-callout>}}_1}{4\mathrm{\&pi;r}}{e}^{-j\frac{\mathrm{\&omega;r}}{c}}\&CenterDot;\&CenterDot;\&CenterDot;\left(3\right)$

Secondly, from the acoustic pressure P of sound wave emission port 23 emitting sound wave in the radio reception position ₂Be different from P ₁, it be the delay of d cos θ place generation reasonable time in distance, and owing to the air vibration at the vibrating reed back side is negative polarity, available (4) formula is represented.In the formula, d " r.

${\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="C9718132100451.png,C9718132100501.png"\; state="\{\{state\}\}">P</figure-callout>}}_2=-\frac{\mathrm{j\&omega;\&rho;A}{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="C9718132100451.png,C9718132100501.png"\; state="\{\{state\}\}">V</figure-callout>}}_2}{4\mathrm{\&pi;r}}{e}^{-j\frac{\mathrm{\&omega;r}}{c}}\&CenterDot;e^{-j\frac{\mathrm{\&omega;d}}{c}\cos \mathrm{\&theta;}}\&CenterDot;\&CenterDot;\&CenterDot;\left(4\right)$

Therefore, because synthetic acoustic pressure P (θ) is P ₁+ P ₂So available (5) formula is represented.

$P\left(\mathrm{\&theta;}\right)=\frac{\mathrm{j\&omega;\&rho;A}}{4\mathrm{\&pi;r}}{e}^{-j\frac{\mathrm{\&omega;r}}{c}}(V_1-V_2{e}^{-j\frac{\mathrm{\&omega;d}}{c}\cos \mathrm{\&theta;}})\&CenterDot;\&CenterDot;\&CenterDot;\left(5\right)$

Equivalent electric circuit from Fig. 2 as can be known, the vibration velocity V in the formula ₂Available (6) formula is represented.

${\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="C9718132100451.png,C9718132100501.png"\; state="\{\{state\}\}">V</figure-callout>}}_2=\frac{{\mathrm{<figure-callout\; id="1"\; label="V"\; filenames="C9718132100451.png,C9718132100461.png"\; state="\{\{state\}\}">V</figure-callout>}}_1}{1+\mathrm{j\&omega;}\frac{r_1}{{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="C9718132100451.png,C9718132100461.png"\; state="\{\{state\}\}">s</figure-callout>}}_1}+{\left(\mathrm{j\&omega;}\right)}^2\frac{m_1}{{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="C9718132100451.png,C9718132100461.png"\; state="\{\{state\}\}">s</figure-callout>}}_1}}\&CenterDot;\&CenterDot;\&CenterDot;\left(6\right)$

(6) formula is represented the secondary low-pass filter characteristic, produces by s in passband ₁, r ₁, m ₁The group delay time of the certain value of decision.The time delay that this time delay and the θ in d cos θ/c that the space obtains change has formed the directivity after amphicheirality and the isotropic directivity combination.Therefore, with (6) formula substitution (5) formula, after the arrangement, and when ω/c=k, following (7) formula.

$P\left(\mathrm{\&theta;}\right)=\frac{\mathrm{j\&omega;\&rho;A}{V}_1{e}^{-\mathrm{jkr}}\&CenterDot;\mathrm{<figure-callout\; id="4"\; label="jkd"\; filenames="C9718132100451.png,C9718132100492.png"\; state="\{\{state\}\}">jkd</figure-callout>}}{4\mathrm{\&pi;r}(1+\mathrm{j\&omega;}\frac{r_1}{{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="C9718132100451.png,C9718132100461.png"\; state="\{\{state\}\}">s</figure-callout>}}_1}+{\left(\mathrm{j\&omega;}\right)}^2\frac{m_1}{s_1})}$

$\&times;\{\frac{1-e^{-\mathrm{jkd}\cos \mathrm{\&theta;}}}{\mathrm{jkd}}+\frac{r_{1}c}{s_{1}d}+\mathrm{jkd}\&CenterDot;\frac{m_1}{s_1}{\left(\frac{c}{d}\right)}^2\}\&CenterDot;\&CenterDot;\&CenterDot;\left(7\right)$

In (7) formula, if with first expansion in series in { }, then following (8) formula.

$\frac{1-e^{-\mathrm{jkd}\cos \mathrm{\&theta;}}}{\mathrm{jkd}}=\cos \mathrm{\&theta;}-\frac{\mathrm{<figure-callout\; id="2"\; label="jkdco\; s"\; filenames="C9718132100451.png,C9718132100501.png"\; state="\{\{state\}\}">jkdco</figure-callout>}{s}^{}{}^2\mathrm{\&theta;}}{2!}$

$+\frac{{\left(\mathrm{jkd}\right)}^2{\mathrm{<figure-callout\; id="3"\; label="cos"\; filenames="C9718132100451.png,C9718132100492.png"\; state="\{\{state\}\}">cos</figure-callout>}}^3\mathrm{\&theta;}}{3!}-\frac{{\left(\mathrm{jkd}\right)}^3{\mathrm{<figure-callout\; id="4"\; label="cos"\; filenames="C9718132100451.png,C9718132100492.png"\; state="\{\{state\}\}">cos</figure-callout>}}^4\mathrm{\&theta;}}{4!}+\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\left(8\right)$

By (8) formula as can be known, in the frequency of kd＜＜1, if the high-order term more than 1 time of jkd is omitted, then (8) formula becomes cos θ.Therefore, the expression of first in { } in (7) formula amphicheirality component.Different therewith, in { } in (7) formula second and the 3rd are irrelevant with θ, so represent the isotropic directivity component.

Therefore, shown in (9) formula, with the acoustic pressure P of frontal (θ=0 °) (θ=0 °) with P (θ) benchmark, then in the frequency of kd＜＜1, shown in (10) formula.

$\frac{r_{1}c}{s_{1}d}=\mathrm{\&alpha;}\&CenterDot;\&CenterDot;\&CenterDot;\left(9\right)$

$=\frac{\cos \mathrm{\&theta;}}{1+\mathrm{\&alpha;}}+\frac{\mathrm{\&alpha;}}{1+\mathrm{\&alpha;}}\&CenterDot;\&CenterDot;\&CenterDot;\left(10\right)$

By (10) formula as can be known, synthetic acoustic pressure P (θ) has the directivity after amphicheirality's component and the isotropic directivity component combination.Can utilize the distribution condition of α value change two components of expression isotropic directivity component.By (9) formula as can be known, this α represents r ₁/ s ₁Ratio with d/c.In Fig. 2, r ₁/ s ₁Expression is by s ₁, r ₁, m ₁Group delay time in the passband of the band pass filter that constitutes.D/c is the front and the 23 space length d needed times of these two sound sources on major axes orientation of sound wave emission port of sonic propagation loud speaker 22.

Fig. 4 represents that the α value is at 0.5,1.0,2.0 o'clock, the directional characterisitic of being tried to achieve by (10) formula.

In (10) formula, α≤1 o'clock, P under certain angle (θ) vanishing., α＞1 o'clock, P under any angle (θ) is non-vanishing.α≤1 o'clock supposes that the angle θ of P (θ) vanishing is θ ₁, then as shown in Figure 4, α=1 o'clock, θ ₁Be 180 °, α=0.5 o'clock, θ ₁Be 120 ° and 240 ° of both directions.Like this, θ=θ ₁The time why P (θ) vanishing, be because the once above high-order term of the jkd that exists in amphicheirality's component of representing with (8) formula is omitted the event., owing in fact there is this high-order term, along with frequency gets higher, the directional characterisitic of amphicheirality's component is not just 8 fonts of circle.Its result, the compound direction figure is also different with the basic directional characterisitic shown in (10) formula.That is, directivity is by deterioration.

For this directivity degradation is reduced to higher frequency, can be under certain angle, the once above high-order term of the jkd that exists in the amphicheirality's component that will represent with (8) formula with the isotropic directivity component is eliminated higher number of times.Take (7) formula and (8) formula, utilize the 3rd in { } in (7) formula, the jkd in can cancellation under certain angle (8) formula once.

Therefore, about the 3rd in { } in (7) formula, shown in (11) formula, if the angle θ that offsets is replaced θ ₂, then cancellation conditions can be represented with (12) formula.In (12) formula, at θ ₂In=0 °～360 ° the scope, cos ²θ ₂≤ 1.Therefore, the value of the β of satisfied (12) formula is β≤0.5.

$\frac{m_1}{s_1}{\left(\frac{c}{d}\right)}^2=\mathrm{\&beta;}\&CenterDot;\&CenterDot;\&CenterDot;\left(11\right)$

$\frac{{\mathrm{<figure-callout\; id="2"\; label="cos"\; filenames="C9718132100451.png,C9718132100501.png"\; state="\{\{state\}\}">cos</figure-callout>}}^2\mathrm{\&theta;}2}{2}=\mathrm{\&beta;}\&CenterDot;\&CenterDot;\&CenterDot;\&CenterDot;\left(12\right)$

Fig. 5 is illustrated under the situation of α=1 (single direction), makes the β value divide 5 phase change in 0～1 scope, and tries to achieve the result of the variation that θ causes by the frequency of P (θ)/P (0 °) in the angle of 90 ° and 180 ° according to (7) formula.Here, the condition of β=0 means m ₁=0., m in fact ₁Can not be for zero, so the condition of β=0 can not realize.

As can be seen from Figure 5, under the low frequency situation of kd≤0.4, the synthetic sound voltage level of the back side direction of loud speaker 22 (θ=180 °) is than frontal (θ=0 °) more than the low 20dB, and laterally the synthetic sound voltage level of (θ=90 °) is the single direction figure than the low 6dB of frontal., along with frequency gets higher, the directivity deterioration when the frequency of kd ≈ π, has directivity hardly.The degradation of this directivity is difference with the difference of β value.

Fig. 6 represent kd=1.5 (during d=7cm, the situation that the directional characterisitic during f=1.2KHz) frequency changes with the variation of β value.As seen from the figure, though the β value can not need be set as far as possible little value for for zero, can both obtain good directivity until higher frequency.The β value is set in 0.5 when following, and the frequency of kd=1.5 is counted as the high frequency limit of actual directivity.

Above theoretical research is the situation that can regard the medium and low frequency of desirable point sound source as about the front and the sound wave emission port 23 of loud speaker 22., in fact because the vibrating reed and the sound wave emission port 23 of loud speaker 22 have limited area, so when medium-high frequency, each is launched sound wave itself and has directivity.Therefore, as mentioned above, give the directivity of utilizing the group delay time, be applicable to the medium and low frequency that the emitting sound wave of loud speaker own does not have directivity, it is appropriate doing like this.

Like this directivity of the loud speaker of Xing Chenging itself with the difference of the bore of size, shape and the loud speaker of the audio amplifier that loud speaker is installed etc. difference., begin with the limiting frequency of directivity and the bore relation of being inversely proportional to of loud speaker, if study known theory analysis and actual measured results etc., situation is as follows.That is, the effective diameter of establishing speaker diaphragm is D, begins can regard as with the limiting frequency of directivity the frequency of satisfied (13) formula.

$\frac{\mathrm{\&omega;}}{c}D=\frac{\mathrm{\&pi;}}{2}\&CenterDot;\&CenterDot;\&CenterDot;\left(13\right)$

If the wavelength X with the emission sound wave is represented (13) formula, then, 4D=λ is arranged according to the relation of ω/c=2 π/λ, the wavelength X of emission sound wave can be regarded 4 times the frequency of the effective diameter D of vibrating reed as.Therefore, as mentioned above, be applied to begin frequency range with below the limiting frequency of directivity in order to give the directivity of utilizing the group delay time, shown below imposing a condition is appropriate.

In loudspeaker arrangement shown in Figure 1 20, as previously described, the high frequency limit of actual directivity can be regarded the frequency of satisfied (14) formula as.

$\frac{\mathrm{\&omega;}}{c}d=\frac{\mathrm{\&pi;}}{2}\&CenterDot;\&CenterDot;\&CenterDot;\left(14\right)$

Therefore, with this frequency setting be make the emission sound waves of loud speaker 22 itself begin with directivity frequency, promptly satisfy the frequency of (13) formula, can think reasonably.Therefore, impose a condition, get (15) by (13), (14) formula

d＝D ……(15)

In other words, it is appropriate the front of loud speaker 22 and the sound wave emission port 23 space length ds of these two sound sources on major axes orientation being set at the effective diameter D that equals speaker diaphragm.In addition, this to impose a condition for the single direction with α=1 be that directivity in the scope of center, α=0.5～2.0 is also set up.

Embodiment when secondly, illustrating single direction as directivity.

Use dynamic loudspeaker as loud speaker 22, bore is 8cm, and the effective diameter of vibrating reed is 7cm, and effective area is 38.5cm ²Audio amplifier 21 is the rectangular shape of putting forward, and the loud speaker installed surface is of a size of: highly, width is respectively for 8.6cm, length is 14cm, and the volume of air is 600cm in the audio amplifier ³Sound wave emission port 23 is rounded, be arranged on audio amplifier 21 above, the effective area of this sound wave emission port 23 is 26cm ²In addition, according to the condition of (15) formula, the front of loud speaker 22 and the sound wave emission port 23 space length ds of these two sound sources on major axes orientation are set at 7cm.

The acoustic resistance of the sound-resistance material 24 of sound wave emission port 23 if represent with the equivalent mechanical resistance behind the area that is converted into speaker diaphragm according to (2), (9) formula, then in the MKS system of units, is r ₁=0.745 (kg/sec).Therefore, be A if establish the effective area of sound wave emission port 23 ₁, the equivalent mechanical resistance r that represents with the effective area of sound wave emission port 23 then ₁' become shown in (16) formula.Therefore, use A ₁(16) formula of removing, the acoustic resistance density (the equivalent mechanical resistance of per unit area) that gets the sound-resistance material 24 of sound wave emission port 23 is 130.8 (kg/secm ²).

${{{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="C9718132100451.png,C9718132100461.png"\; state="\{\{state\}\}">r</figure-callout>}}_1}^{\&prime;}=r_1\left(\frac{A_1}{A}\right)}^2=0.34[\mathrm{kg}/\sec ]\&CenterDot;\&CenterDot;\&CenterDot;\left(16\right)$

Solid line a among Fig. 7, chain-dotted line b, dotted line c represent the output acoustic pressure direction frequency characteristic of the loudspeaker arrangement 20 of this embodiment, and medium and low frequency has single direction as can be known.Effective diameter at vibrating reed is under the situation of 7cm, and according to (13), loud speaker itself begins to be about 1.2KHz with the limiting frequency of directivity.Therefore, by setting d=D=7cm, can obtain frequency and be about following, the enough single direction of practicality of 1.5KHz.Solid line a among Fig. 7, chain-dotted line b, the output acoustic pressure direction frequency characteristic when dotted line c represents not establish sound wave emission port 23 do not have directivity when medium and low frequency.

In addition, no matter how above-mentioned, in loudspeaker arrangement shown in Figure 1 20, the variable open area device that the area that changes sound wave emission port 23 is used can be set also.As this variable open area device, can consider to be similar to for example iris ring mechanism of camera.If change the area of sound wave emission port 23, then the acoustic resistance of sound wave emission port 23 and acoustic mass change thereupon, low-frequency filter by the acoustic capacitance that is presented by air in these acoustic resistances, acoustic mass and the audio amplifier constitutes changed from the group delay time of sound wave emission port 23 emitting sound wave in passband.Therefore, by the variable open area device is set, can adjust the group delay time arbitrarily, the user is the adjustment of travel direction characteristic simply.

In addition, be not limited to the numerical value of above explanation, can suitably select the acoustic resistance density of the bore and the sound-resistance material 24 of sound wave emission port 23.

Like this, the acoustic capacitance that air presents in the acoustic resistance of loudspeaker arrangement 20 usefulness sound wave emission ports 23 shown in Figure 1 and acoustic mass and the audio amplifier 21 constitutes low-frequency filter, utilize and pass through this low-frequency filter, obtain directivity from the group delay time of sound wave emission port 23 emitting sound wave in passband.Therefore, irrelevant with the size and dimension of audio amplifier 21, can set the group delay time arbitrarily, can both stably obtain desirable directivity until ultralow frequency.

For example, front by will being set at sonic propagation loud speaker 22 group delay time and 1/2～2 times of 23 these the space length d needed times of two sound sources on major axes orientation of sound wave emission port can be given the directivity that super heart-shaped directivity, heart-shaped directivity (single direction) etc. combine isotropic directivity and amphicheirality.

In addition, 0.7～1.5 times the value that is set at the effective diameter D of speaker diaphragm by front and the sound wave emission port 23 space length d of these two sound sources on major axes orientation with loud speaker 22, being limited to loud speaker itself begins can give desirable directivity effectively with in the frequency range below the frequency of directivity.

Secondly, Fig. 8 represents the stereo loudspeaker arrangement 30 of another optimal morphology.This loudspeaker arrangement 30 is made of with loudspeaker arrangement 31R with loudspeaker arrangement 31L and R channel L channel.

In the audio amplifier 32L that constitutes loudspeaker arrangement 31L, in front and form loud speaker installed surface 33L between the right flank, voice signal regeneration is installed on this loud speaker installed surface 33L with loud speaker 34L.At this moment, as shown in Figure 9, the main shaft MA of loud speaker 34L _LFrontal F with respect to audio amplifier 32L _LThe angle r that is regulation in the counterclockwise direction for example tilts 40 °～50 ° to be installed on the audio amplifier 32L.

On the end face (in figure above) different, be provided with sound wave emission port (opening portion) 36L of the circle that covers with sound-resistance material 35L with the loud speaker installed surface 33L of audio amplifier 32L.This sound wave emission port 36L is used for the air vibration that the back side from the vibrating reed of loud speaker 34L produces is transmitted into the outside as sound wave, forms the axle that runs through its center along the direction of the main shaft (reference axis) of loud speaker 34L.

In the case, acoustic capacitance and the acoustic resistance of sound wave emission port 36L and the low-frequency filter that acoustic mass constitutes sound equipment that presents with the air in the audio amplifier 32L.And, utilize by this low-frequency filter from the sound wave emission port 36L group delay time of emitting sound wave in passband, can give the directivity of following acquisition, promptly in loudspeaker arrangement 31L, be pressed on the place ahead main shaft of loud speaker 34L the directivity that isotropic directivity by having peak response and amphitropic combination obtain from the front of loud speaker 34L and the synthetic sound of these two sound source emitting sound wave of sound wave emission port 36L.

Between the front of the audio amplifier 32R that constitutes loudspeaker arrangement 31R and the left side, form loud speaker installed surface 33R, voice signal regeneration loud speaker 34R is installed on this loud speaker installed surface 33R.This situation as shown in Figure 9, loud speaker 34R is mounted obliquely within on the audio amplifier 32R, makes its main shaft MA _RFrontal F with respect to audio amplifier 32R _RConstitute predetermined angular γ along clockwise direction, for example 40 °～50 °.

Sound wave emission port (opening portion) 36R of the circle that is covered with sound-resistance material 35R is set on the end face different with the loud speaker installed surface 33R of audio amplifier 32R (among the figure top).This sound wave emission port 36R is used for the air vibration that the back side from the vibrating reed of loud speaker 34R produces is transmitted into the outside as sound wave, and the axle that runs through its center extends along the direction of the main shaft (reference axis) of loud speaker 34R.Therefore, the same with above-mentioned loudspeaker arrangement 31L, in loudspeaker arrangement 31R, from the front of loud speaker 34R and the synthetic sound pressing element of these two sound source emitting sound wave of sound wave emission port 36R directivity is arranged, this directivity is to obtain by isotropic directivity that has peak response on the main shaft of the place ahead of loud speaker 34R and amphitropic combination.

Here, as mentioned above, the principle of passing through the directivity that isotropic directivity and amphitropic combination obtain that is had about loudspeaker arrangement 31L, 31R is identical with loudspeaker arrangement 20 shown in Figure 1, so its explanation is omitted.

In stereo loudspeaker arrangement 30 shown in Figure 8, the main shaft MA of voice signal regeneration loud speaker 34L, 34R _L, MA _RRespectively with respect to the frontal F of audio amplifier 32L, 32R _L, F _RIn the counterclockwise direction, the tilt angle γ of regulation of clockwise direction, listen to position (with reference to Fig. 9), the main shaft MA of loud speaker 34L, 34R from the center line M of loudspeaker arrangement 31L, 31R _L, MA _RTowards the inboard.In addition, loudspeaker arrangement 31L, 31R have the directivity that isotropic directivity by having peak response and amphitropic combination obtain respectively on the main shaft of the place ahead of loud speaker 34L, 34R.

Therefore, beyond on the center line M of loudspeaker arrangement 31L, 31R listen to the position, for example at b point (with reference to Figure 28), the sound pressure level of R channel descends, the sound pressure level of L channel has some risings simultaneously, based on about two sound channels with the difference of range attenuation, it is poor to revise sound pressure level.If therefore adopt stereo loudspeaker arrangement 30 shown in Figure 8, can enlarge the scope of listening to that obtains good three-dimensional phonoreception.

The applicant as mentioned above, in order to confirm whether to have enlarged the scope of listening to that obtains good three-dimensional phonoreception, has carried out bearing test in stereo loudspeaker arrangement 30 shown in Figure 8.Figure 10 is illustrated in this bearing test, the loudspeaker arrangement 41 that uses with loudspeaker arrangement with loudspeaker arrangement and R channel as L channel.This loudspeaker arrangement 41 has one-way.

Audio amplifier 42 is cuboid, and the loud speaker installed surface is of a size of longitudinal and transverse each 8.6cm, and the volume of air is 600cm in the long 14cm, audio amplifier ³Use dynamic loudspeaker as voice signal regeneration with loud speaker 43, bore is 8cm, and the effective diameter of vibrating reed is 7cm, and effective area is 38.5cm ²Sound wave emission port 44 is rounded, be arranged on audio amplifier 42 above, its effective area is 26cm ²In addition, according to (15) formula, the space length d of the major axes orientation of the front of loud speaker 43 and sound wave emission port 44 these two sound sources is set at 7cm.

If the acoustic resistance of the sound-resistance material 45 of sound wave emission port 44 is expressed as the equivalent mechanical resistance that usefulness (2), (9) formula are converted into the area of speaker diaphragm, then in the MKS system of units, be expressed as r ₁=0.745 (kg/sec).Therefore, be A if establish the effective area of sound wave emission port 44 ₁, then as mentioned above, the equivalent mechanical resistance r that represents with the effective area of sound wave emission port 44 ₁' represent by (16) formula.In addition, use A ₁(16) formula of removing, then the acoustic resistance density of the sound-resistance material 45 of sound wave emission port 44 (the equivalent mechanical resistance of per unit area) is 130.8 (kg/secm ²).

Solid line a among above-mentioned Fig. 7, chain-dotted line b, dotted line c represent the output acoustic pressure direction frequency characteristic of loudspeaker arrangement 41, have single directivity at medium and low frequency as can be known.In addition, the reproduction band of positive direction (0 ° of direction) (3dB is following) is 300Hz～20KHz.Effective diameter at vibrating reed is under the situation of 7cm, and according to (13) formula, the limiting frequency that loud speaker itself begins to have directivity is about 1.2KHz.Therefore, by setting d=D=7cm, be that 1.5KHz is when following in frequency, different with the sound pressure level of 0 ° of direction, the sound pressure level of the 90 ° of directions 6dB that descends approximately, the sound pressure level decline 15dB～20dB of 180 ° of directions can obtain single direction enough in practicality.Solid line d among Fig. 7, chain-dotted line e, the output acoustic pressure direction frequency characteristic when dotted line f represents to be provided with sound wave emission port 44 are isotropic directivity at medium and low frequency.

Use loudspeaker arrangement 41 shown in Figure 10 as L channel with loudspeaker arrangement and R channel loudspeaker arrangement, under state shown in Figure 11, it is configured in the reverberation time is about in 0.2 second the listening room 100 and has carried out bearing test.In bearing test, tried to achieve the scope of listening to that can obtain good three-dimensional phonoreception in order to following method.

Promptly, on the center line M of two loudspeaker arrangements 41,41 listen to the position, for example at the signal tone (for example vowel etc.) of a point location in central the place ahead, even listen to the position beyond the center line M, if be positioned to listen to the direction in the centre position (c point) of two loudspeaker arrangements 41,41 of seeing the position from this, then listen to the position and can reproduce stereo stage continuous between two loudspeaker arrangements 41,41, can obtain good three-dimensional phonoreception at this.Therefore, in bearing test, listening to the position, for example be conceived to be positioned the signal tone in central the place ahead at a point on the center line M of two loudspeaker arrangements 41,41, tried to achieve the position of listening to beyond the center line M, this signal tone is positioned the scope of direction in the centre position of two loudspeaker arrangements 41,41.

In Figure 11, to suppose the sound wave emission port 44 of loudspeaker arrangement 41 closed to form closed, the main shaft that makes loud speaker 43 simultaneously is towards frontal (direction that is parallel to the sidewall of listening room 100), with this 1. as condition, dotted line L _-1Be illustrated under this condition situation 1., can obtain the boundary of the scope of listening to of good three-dimensional phonoreception, from this dotted line L _-1To the scope of center line M one side, obtained good three-dimensional phonoreception.1. the scope of listening to that can obtain good three-dimensional phonoreception is limited in the narrow scope by this condition.

In addition, suppose the sound wave emission port 44 of loudspeaker arrangement 41 closed to form closed, the main shaft that makes loud speaker 43 simultaneously in 45 °, with this 2. as condition, chain-dotted line L _-2Be illustrated under this condition situation 2., can obtain the boundary of the scope of listening to of good three-dimensional phonoreception, from this chain-dotted line L _-2To the scope of center line M one side, obtained good three-dimensional phonoreception.Under this condition situation 2., to compare with condition situation 1., the scope of listening to that can obtain good three-dimensional phonoreception is extended many.

Different therewith, suppose the sound wave emission port 44 of loudspeaker arrangement 41 opened, make the frequency range below about 1.5KHz be one-way, the main shaft that makes loud speaker 43 simultaneously in 45 °, with this 3. as condition, solid line L _-3Be illustrated under this condition situation 3., can obtain the boundary of the scope of listening to of good three-dimensional phonoreception, from this solid line L _-3To the scope of center line M one side, obtained good three-dimensional phonoreception.Under this condition situation 3., to compare with condition situation 2., the scope of listening to that can obtain good three-dimensional phonoreception is further extended.The directivity of this expression low frequency is big to the audio-video location influence of listening to the position beyond the center line M of two loudspeaker arrangements 21,21.

Can acquisition can followingly consider by the expansion effect of the scope of listening to of the good three-dimensional phonoreception of such one-way generation.For example, in Figure 11, away from the center line M of two loudspeaker arrangements 41,41 listen to the position, for example at the d point, about 10 ° of the main shaft of the deviation in driction loud speaker 43 that the d of the loudspeaker arrangement 41 that L channel is used is ordered (10 ° of θ ≈), but when departing from this degree, can regard the direction of the peak response that almost is loudspeaker arrangement 41 as.

Different therewith, about 85 ° of the main shaft of the deviation in driction loud speaker 43 that the d of the loudspeaker arrangement 41 that R channel is used is ordered (85 ° of θ ≈).Therefore, the directional characterisitic of the one-way from Fig. 4 (heart-shaped directivity), the remolding sensitivity peak response (=1) of the loudspeaker arrangement 41 that R channel is used is hanged down 5.2dB, becomes 0.55.Even can think at the d point, the decline of the sound pressure level that is caused by this directivity also has the effect of good phonotape and videotape location.

If think like this, under the situation of super heart-shaped directivity, the low 8.4dB of remolding sensitivity peak response during θ=85 ° becomes 0.38 (with reference to Fig. 4), can think that super heart-shaped directivity listens to aspect the scope more effective than one-way (heart-shaped directivity) in expansion.

The amphicheirality in the one-way (heart-shaped directivity) and the component ratio of isotropic directivity are 1: 1, and the above-mentioned component ratio of super heart-shaped directivity is 1: 0.5, and amphicheirality's component is 2 times of isotropic directivity component.; if the component ratio of amphicheirality's component becomes higher directivity; then the low-frequency limit owing to reproduction band narrows down, so from practical aspect, the directivity with directional characterisitic of the scope from one-way (heart-shaped directivity) to super heart-shaped directivity suits.

In addition, about the main shaft that makes loud speaker 43 angle towards the interior side direction of two loudspeaker arrangements 41,41, if too towards the inboard, for example under the situation that the point of the d in Figure 11 is listened to, reason owing to the directivity relevant with the diameter of speaker diaphragm, R channel descends at treble significantly with the sound pressure level of loudspeaker arrangement 41, the high pitch deficiency so tonequality becomes.Therefore, from expansion effect and tonequality two aspects of listening to scope, above-mentioned angle towards interior side direction suits at 40 °～50 °.

Secondly, Figure 12 represents another stereo loudspeaker arrangement 50 as preference.This loudspeaker arrangement 50 is made of with loudspeaker arrangement 51R with loudspeaker arrangement 51L and R channel L channel.

Loudspeaker arrangement 51L is a kind of loudspeaker arrangement of two-way mode, constitutes the front that voice signal regeneration is installed in the audio amplifier 52L that roughly is rectangular-shaped with the bass horn 53L and the loudspeaker 54L of loud speaker.Bass horn 53L and loudspeaker 54L are installed in front one side of audio amplifier 52L like this,, make the frontal of its main shaft towards audio amplifier 52L that is.In addition, on audio amplifier 52L, the upper portion at the angle that will be made of its front and right flank cuts away, and forms loud speaker installed surface 55L, and voice signal regeneration is installed on this installed surface 55L with loud speaker 56L.At this moment, as shown in figure 13, loud speaker 56L is installed on the audio amplifier 52L like this, i.e. its main shaft MA _LFrontal F with respect to audio amplifier 52L _LThe angle γ of the regulation that tilts in the counterclockwise direction, for example 40 °～50 °.

In addition, on the end face (in figure above) different, be provided with sound wave emission port (opening portion) 58L of the circle that covers with sound-resistance material 57L with the loud speaker installed surface 55L of audio amplifier 52L.This sound wave emission port 58L is used for the air vibration that the back side from the vibrating reed of loud speaker 56L produces is transmitted into the outside as sound wave, forms the axle that runs through its center along the major axes orientation of loud speaker 56L.Though above not explanation, in the inside of audio amplifier 52L, the casing part that loud speaker 56L is installed is spaced mutually with another casing part.

In the case, acoustic capacitance and the acoustic resistance of sound wave emission port 58L and the low-frequency filter that acoustic mass constitutes sound equipment that presents with the air in the casing part that loud speaker 56L is installed of audio amplifier 52L.And, utilize by this low-frequency filter from the sound wave emission port 58L group delay time of emitting sound wave in passband, can give the directivity of following acquisition, promptly in the speaker portion that the loud speaker 56L by loudspeaker arrangement 51L constitutes, be pressed on the place ahead main shaft of loud speaker 56L the directivity that isotropic directivity by having peak response and amphitropic combination obtain from the front of loud speaker 56L and the synthetic sound of these two sound source emitting sound wave of sound wave emission port 58L.

Loudspeaker arrangement 51R is a kind of loudspeaker arrangement of two-way mode, constitutes the front that voice signal regeneration is installed in the audio amplifier 52R that roughly is rectangular-shaped with the bass horn 53R and the loudspeaker 54R of loud speaker.Bass horn 53R and loudspeaker 54R are installed in front one side of audio amplifier 52R like this,, make the frontal of its main shaft towards audio amplifier 52R that is.In addition, on audio amplifier 52R, the upper portion at the angle that will be made of its front and left surface cuts away, and forms loud speaker installed surface 55R, and voice signal regeneration is installed on this installed surface 55R with loud speaker 56R.At this moment, as shown in figure 13, loud speaker 56R is installed on the audio amplifier 52R like this, i.e. its main shaft MA _RFrontal F with respect to audio amplifier 52R _RThe angle γ of the regulation that tilts along clockwise direction, for example 40 °～50 °.

In addition, sound wave emission port (opening portion) 58R of the circle that is covered with sound-resistance material 57R is set on the end face different with the loud speaker installed surface 55R of audio amplifier 52R (among the figure top).This sound wave emission port 58R is used for the air vibration that the back side from the vibrating reed of loud speaker 56R produces is transmitted into the outside as sound wave, and the axle that runs through its center extends along the major axes orientation of loud speaker 56R.Though above not explanation, in the inside of audio amplifier 52R, the casing part that loud speaker 56R is installed is spaced mutually with another casing part.

In the case, acoustic capacitance and the acoustic resistance of sound wave emission port 58R and the low-frequency filter that acoustic mass constitutes sound equipment that presents with the air in the casing part that loud speaker 56R is installed of audio amplifier 52R.And, utilize by this low-frequency filter from the sound wave emission port 58R group delay time of emitting sound wave in passband, can give the directivity of following acquisition, promptly in the speaker portion that the loud speaker 56R by loudspeaker arrangement 51R constitutes, be pressed on the place ahead main shaft of loud speaker 56R the directivity that isotropic directivity by having peak response and amphitropic combination obtain from the front of loud speaker 56R and the synthetic sound of these two sound source emitting sound wave of sound wave emission port 58R.

In stereo loudspeaker arrangement 50 shown in Figure 12, the main shaft MA of voice signal regeneration loud speaker 56L, 56R _L, MA _RRespectively with respect to the frontal F of audio amplifier 52L, 52R _L, F _RIn the counterclockwise direction, the tilt angle γ of regulation of clockwise direction, listen to position (with reference to Figure 13), the main shaft MA of loud speaker 56L, 56R from the center line M of loudspeaker arrangement 51L, 51R _L, MA _RTowards the inboard.In addition, the directivity that on the main shaft of the place ahead of loud speaker 56L, 56R, has the combination of amphicheirality by having peak response and isotropic directivity to obtain respectively by the loud speaker 56L of loudspeaker arrangement 51L, 51R, speaker portion that 56R constitutes.

Therefore, beyond on the center line M of loudspeaker arrangement 51L, 51R listen to the position, for example at b point (with reference to Figure 28), the sound pressure level of R channel descends, the sound pressure level of L channel has some risings simultaneously, based on about two sound channels with the difference of range attenuation, it is poor to revise sound pressure level.Therefore, if adopt stereo loudspeaker arrangement 50 shown in Figure 12, then the stereo loudspeaker arrangement 30 with shown in Figure 8 is the same, can enlarge the scope of listening to that obtains good three-dimensional phonoreception.

The applicant as mentioned above, in order to confirm whether to have enlarged the scope of listening to that obtains good three-dimensional phonoreception, has carried out bearing test in stereo loudspeaker arrangement 50 shown in Figure 12.Figure 14 is illustrated in this bearing test, the loudspeaker arrangement 60 that uses with loudspeaker arrangement with loudspeaker arrangement and R channel as L channel.This loudspeaker arrangement 60 is to have disposed loudspeaker arrangement shown in Figure 10 41 on the top of loudspeaker arrangement 61.Loudspeaker arrangement 61 is loudspeaker arrangements of a kind of two-way mode, and it is in the audio amplifier 62 of wide=20cm, length=22cm, height=30cm, and the bore that voice signal regeneration usefulness has been installed is the bass horn 63 of 14cm and the loudspeaker 64 that bore is 8cm.

Use loudspeaker arrangement 60 shown in Figure 14 as L channel with loudspeaker arrangement and R channel loudspeaker arrangement, under state shown in Figure 15, it is configured in the reverberation time is about in 0.2 second the listening room 100 and has carried out bearing test.At this moment, adopted the method identical, tried to achieve the scope of listening to that can obtain good three-dimensional phonoreception with the situation of Figure 11.In addition, the main shaft of the bass horn 63 of the loudspeaker arrangement 61 of two-way mode and loudspeaker 64 disposes towards frontal (sidewall that is parallel to listening room 100).In addition, at the main shaft of the loud speaker 43 that makes loudspeaker arrangement 41 under the state of frontal, the sound pressure level of listening to the position, for example ordering at a on the center line M of two loudspeaker arrangements 60,60 of this loudspeaker arrangement 41 is set to such an extent that compare low 3dB with the sound pressure level of the loudspeaker arrangement 61 of two-way mode.

In Figure 15, to suppose the sound wave emission port 44 of loudspeaker arrangement 41 closed to form closed, the main shaft that makes loud speaker 43 simultaneously is towards frontal, with this 4. as condition, dotted line L _-4Be illustrated under this condition situation 4., can obtain the boundary of the scope of listening to of good three-dimensional phonoreception, from this dotted line L _-4To the scope of center line M one side, obtained good three-dimensional phonoreception.The same with the condition situation 1. among Figure 11,4. the scope of listening to that can obtain good three-dimensional phonoreception is limited in the narrow scope by this condition.

In addition, suppose the sound wave emission port 44 of loudspeaker arrangement 41 closed to form closed, the main shaft that makes loud speaker 43 simultaneously in 45 °, with this 5. as condition, chain-dotted line L _-5Be illustrated under this condition situation 5., can obtain the boundary of the scope of listening to of good three-dimensional phonoreception, from this chain-dotted line L _-5To the scope of center line M one side, obtained good three-dimensional phonoreception.Under this condition situation 5., compare with condition situation 4., the scope of listening to that can obtain good three-dimensional phonoreception is extended many, but compares with the condition situation 2. among Figure 11, become narrower.

Different therewith, suppose the sound wave emission port 44 of loudspeaker arrangement 41 opened, make the frequency range below about 1.5KHz be one-way, the main shaft that makes loud speaker 43 simultaneously in 45 °, with this 6. as condition, solid line L _-6Be illustrated under this condition situation 6., can obtain the boundary of the scope of listening to of good three-dimensional phonoreception, from this solid line L _-6To the scope of center line M one side, obtained good three-dimensional phonoreception.

Under this condition situation 6., compare with condition situation 5., the scope of listening to that can obtain good three-dimensional phonoreception is further enlarged, but compare with the condition situation 3. among Figure 11, some have been narrowed down, but under above-mentioned sound pressure level condition, on the emission sound wave that produces by the loudspeaker arrangement 61 that will be attached to from the emission sound wave of small-sized unidirectional loudspeaker arrangement 41 towards the two-way mode of frontal, we can say effect with the remarkable expansion of the scope of listening to that can obtain good three-dimensional phonoreception.

At this moment, about the directivity of additional loudspeaker arrangement 41, the directivity that has the directional characterisitic of the scope from heart-shaped directivity to super heart-shaped directivity as mentioned above suits.In addition, the set angle about the main shaft of directionality speaker suits it towards the inboard in 40 °～50 ° scope.

Like this, Fig. 8, stereo loudspeaker arrangement 30 shown in Figure 12,50 owing to the position of listening to from the center line of two loudspeaker arrangements, L channel is used and R channel uses the main shaft of loud speaker towards the inboard with the voice signal regeneration of loudspeaker arrangement, the speaker portion that is made of with loud speaker voice signal regeneration of these two loudspeaker arrangements has the directivity that the combination by amphicheirality and isotropic directivity obtains simultaneously, so listen to the position beyond on the center line of two loudspeaker arrangements, based on about two sound channels with the difference of range attenuation, it is poor to revise sound pressure level, can enlarge the scope of listening to that can obtain good three-dimensional phonoreception.In addition, the speaker portion that is made of with loud speaker voice signal regeneration of two loudspeaker arrangements is the parts with directivity that the combination by amphicheirality and isotropic directivity obtains, for example utilize from the group delay time of sound wave emission port emitting sound wave, can obtain directivity, with the directivity of utilizing loud speaker itself to have like that in the past or utilize the part of amphicheirality's loud speaker to compare, help making the system configuration miniaturization.

Secondly, Figure 16 represents another stereo loudspeaker arrangement 70 as preference.This loudspeaker arrangement 70 is made of with loudspeaker arrangement 71R with loudspeaker arrangement 71L and R channel L channel.

Loudspeaker arrangement 71L is a kind of loudspeaker arrangement of two-way mode, constitutes the front that voice signal regeneration is installed in the audio amplifier 72L that roughly is rectangular-shaped with the bass horn 73L and the loudspeaker 74L of loud speaker.Bass horn 73L and loudspeaker 74L are installed in front one side of audio amplifier 72L like this,, make the frontal of its main shaft towards audio amplifier 72L that is.In addition, on audio amplifier 72L, the upper portion at the angle that will be made of its front and right flank cuts away, and forms loud speaker installed surface 75L, and voice signal regeneration is installed on this installed surface 75L with loud speaker 77L with loud speaker 76L and surround sound signal regeneration.At this moment, as shown in figure 17, loud speaker 76L, 77L are installed on the audio amplifier 72L like this, i.e. its main shaft MA _L, SA _LFrontal F with respect to audio amplifier 72L _LThe angle γ of the regulation that tilts in the counterclockwise direction, for example 40 °～50 °.

In addition, on the end face (in figure above) different, be provided with sound wave emission port (opening portion) 79L of the circle that covers with sound-resistance material 78L with the loud speaker installed surface 75L of audio amplifier 72L.This sound wave emission port 79L is used for the air vibration that the back side from the vibrating reed of loud speaker 76L produces is transmitted into the outside as sound wave, forms the axle that runs through its center along the major axes orientation of loud speaker 76L.Though above not explanation, in the inside of audio amplifier 72L, the casing part that loud speaker 76L is installed is spaced mutually with another casing part.

In the case, acoustic capacitance and the acoustic resistance of sound wave emission port 79L and the low-frequency filter that acoustic mass constitutes sound equipment that presents with the air in the casing part that loud speaker 76L is installed of audio amplifier 72L.And, utilize by this low-frequency filter from the sound wave emission port 79L group delay time of emitting sound wave in passband, can give the directivity of following acquisition, promptly in the speaker portion that the loud speaker 76L by loudspeaker arrangement 71L constitutes, be pressed on the place ahead main shaft of loud speaker 76L the directivity that isotropic directivity by having peak response and amphitropic combination obtain from the front of loud speaker 76L and the synthetic sound of these two sound source emitting sound wave of sound wave emission port 79L.

Loudspeaker arrangement 71R is a kind of loudspeaker arrangement of two-way mode, constitutes the front that voice signal regeneration is installed in the audio amplifier 72R that roughly is rectangular-shaped with the bass horn 73R and the loudspeaker 74R of loud speaker.Bass horn 73R and loudspeaker 74R are installed in front one side of audio amplifier 72R like this,, make the frontal of its main shaft towards audio amplifier 72R that is.In addition, on audio amplifier 72R, the upper portion at the angle that will be made of its front and left surface cuts away, and forms loud speaker installed surface 75R, and voice signal regeneration is installed on this installed surface 75R with loud speaker 77R with loud speaker 76R and surround sound signal regeneration.At this moment, as shown in figure 17, loud speaker 76R, 77R are installed on the audio amplifier 72R like this, i.e. its main shaft MA _R, SA _RFrontal F with respect to audio amplifier 72R _RThe angle γ of the regulation that tilts along clockwise direction, for example 40 °～50 °.

In addition, sound wave emission port (opening portion) 79R of the circle that is covered with sound-resistance material 78R is set on the end face different with the loud speaker installed surface 75R of audio amplifier 72R (among the figure top).This sound wave emission port 79R is used for the air vibration that the back side from the vibrating reed of loud speaker 76R produces is transmitted into the outside as sound wave, and the axle that runs through its center extends along the major axes orientation of loud speaker 76R.Though above not explanation, in the inside of audio amplifier 72R, the casing part that loud speaker 76R is installed is spaced mutually with another casing part.

In the case, acoustic capacitance and the acoustic resistance of sound wave emission port 79R and the low-frequency filter that acoustic mass constitutes sound equipment that presents with the air in the casing part that loud speaker 76R is installed of audio amplifier 72R.And, utilize by this low-frequency filter from the sound wave emission port 79R group delay time of emitting sound wave in passband, can give the directivity of following acquisition, promptly in the speaker portion that the loud speaker 76R by loudspeaker arrangement 71R constitutes, be pressed on the place ahead main shaft of loud speaker 76R the directivity that isotropic directivity by having peak response and amphitropic combination obtain from the front of loud speaker 76R and the synthetic sound of these two sound source emitting sound wave of sound wave emission port 79R.

Here, as mentioned above, the principle that has the directivity that obtains by isotropic directivity and amphitropic combination about the speaker portion that constitutes respectively with loud speaker 76L, 76R of loudspeaker arrangement 71L, 71R is identical with loudspeaker arrangement 20 shown in Figure 1, so its explanation is omitted.

In stereo loudspeaker arrangement 70 shown in Figure 16, the main shaft MA of voice signal regeneration loud speaker 76L, 76R _L, MA _RRespectively with respect to the frontal F of audio amplifier 72L, 72R _L, F _RIn the counterclockwise direction, the tilt angle γ of regulation of clockwise direction, listen to position (with reference to Figure 17), the main shaft MA of loud speaker 76L, 76R from the center line M of loudspeaker arrangement 71L, 71R _L, MA _RTowards the inboard.In addition, the directivity that on the main shaft of the place ahead of loud speaker 76L, 76R, has the combination of amphicheirality by having peak response and isotropic directivity to obtain respectively by the loud speaker 76L of loudspeaker arrangement 71L, 71R, speaker portion that 76R constitutes.

Therefore, beyond on the center line M of loudspeaker arrangement 71L, 71R listen to the position, for example at b point (with reference to Figure 28), the sound pressure level of R channel descends, the sound pressure level of L channel has some risings simultaneously, based on about two sound channels with the difference of range attenuation, it is poor to revise sound pressure level.Therefore, if adopt stereo loudspeaker arrangement 70 shown in Figure 16, then can enlarge the scope of listening to that obtains good three-dimensional phonoreception.

In addition, in stereo loudspeaker arrangement 70 shown in Figure 16, the main shaft SA of surround sound signal regeneration loud speaker 77L, 77R _L, SA _RRespectively with respect to the frontal F of audio amplifier 72L, 72R _L, F _RThe angle γ of clockwise direction inclination regulation in the counterclockwise direction.Therefore, listen to position (with reference to Figure 17), the main shaft SA of loud speaker 77L, 77R from the center line M of loudspeaker arrangement 71L, 71R _L, SA _RTowards the inboard.

In general, the S signal component as the fundamental component of surround sound signal is the signal that has fundamental component in the medium-high frequency.And the vibrating reed of loud speaker 77L, 77R has limited area, so as shown in figure 34, emission sound wave itself just has directivity in medium-high frequency.

Therefore, as mentioned above, because the main shaft SA of loud speaker 77L, 77R _L, SA _RTowards the inboard, so beyond on center line M listen to the position, for example at f point (with reference to Figure 31), the sound pressure level of R channel descends, the sound pressure level of L channel has some risings simultaneously, based on about the surround sound signal tone of two sound channels with the difference of range attenuation, and to the directive effect of revising the sound pressure level difference.Therefore, if adopt stereo loudspeaker arrangement 70 shown in Figure 16, then can enlarge the scope of listening to that obtains good three-dimensional phonoreception.

The same with stereo loudspeaker arrangement 50 shown in Figure 12, the applicant use loudspeaker arrangement shown in Figure 14 60 as L channel with loudspeaker arrangement and R channel loudspeaker arrangement, by hearing test, confirmed in stereo loudspeaker arrangement 70 shown in Figure 16, as mentioned above, enlarged the scope of listening to (with reference to Figure 15) that obtains good three-dimensional phonoreception.

Like this except voice signal (LR signal) regenerating unit (loudspeaker arrangement) that has enlarged the scope of listening to, the applicant is also using surround sound loudspeaker arrangement 77L, 77R shown in Figure 16 to make under the situation of surround sound signal regeneration, in order to confirm whether can enlarge the scope of listening to that obtains good three-dimensional phonoreception, carried out bearing test.Figure 18 is illustrated in this bearing test, the loudspeaker arrangement 80 that uses with loudspeaker arrangement with loudspeaker arrangement and R channel as L channel.This loudspeaker arrangement 80 is to have disposed loudspeaker arrangement 81 to form between loudspeaker arrangement shown in Figure 14 61,41.Loudspeaker arrangement 81 has been installed bore and is the loud speaker 83 that the surround sound signal regeneration of 8cm is used in the airtight audio amplifier 82 of wide=9cm, length=7cm, height=9cm, its reproduction band is 300Hz～20kHz.

Use loudspeaker arrangement 80 shown in Figure 180 as L channel with loudspeaker arrangement and R channel loudspeaker arrangement, under state shown in Figure 19, it is configured in the reverberation time is about in 0.2 second the listening room 100 and has carried out bearing test.Experimental condition is as follows.7. among Figure 19 is such a case: do not use loudspeaker arrangement 41 as existing systems, the main shaft of the bass horn 63 of the loudspeaker arrangement 61 of two sound channels and loudspeaker 64 is under the state of frontal (sidewall that is parallel to listening room 100) about making, and makes surround sound regeneration tilt 30 ° laterally with the main shaft of the loud speaker 83 of loudspeaker arrangement 81.8. among Figure 19 is such a case: do not use loudspeaker arrangement 41 as existing systems, the main shaft of the bass horn 63 of the loudspeaker arrangement 61 of two sound channels and loudspeaker 64 is under the state of frontal about making, make surround sound regeneration with the main shaft of the loud speaker 83 of loudspeaker arrangement 81 towards frontal.9. among Figure 19 is such a case: use loudspeaker arrangement 41 as system of the present invention, the main shaft of the bass horn 63 of the loudspeaker arrangement 61 of two sound channels and loudspeaker 64 is towards frontal, tilt under 45 ° the state main shaft of the loud speaker 43 of loudspeaker arrangement 41 to the inside simultaneously about making, and makes surround sound regeneration tilt 45 ° to the inside with the main shaft of the loud speaker 83 of loudspeaker arrangement 81.

In addition, at the main shaft of the loud speaker 43 that makes loudspeaker arrangement 41 under the state of frontal, the sound pressure level of listening to the position, for example ordering at e on the center line M of two loudspeaker arrangements 80,80 of this loudspeaker arrangement 41 is set to such an extent that compare low 3dB with the sound pressure level of the loudspeaker arrangement 61 of two-way mode.

In Figure 19, dotted line L _-7Be illustrated under the above-mentioned experimental condition situation 7., can obtain the boundary of the scope of listening to of good stereophonic effect, from this dotted line L _-7To the scope of center line M one side, obtained good stereophonic effect.In addition, chain-dotted line L _-8Be illustrated under the above-mentioned experimental condition situation 8., can obtain the boundary of the scope of listening to of good stereophonic effect, from this chain-dotted line L _-8To the scope of center line M one side, obtained good stereophonic effect.Compare with situation 7. in this case, the scope of listening to that can obtain good stereophonic effect enlarges to some extent, but is limited in the narrow scope.

Different therewith, solid line L _-9Be illustrated under the above-mentioned experimental condition of the present invention situation 9., can obtain the boundary of the scope of listening to of good surround sound effect, from this solid line L _-9To the scope of center line M one side, obtained good surround sound effect.Compare with situation 8. in this case, the scope of listening to that can obtain good stereophonic effect enlarges significantly.Therefore, confirmed in stereo loudspeaker arrangement 70 shown in Figure 16, more can enlarge the scope of listening to that can obtain good stereophonic effect.

In addition, though stereo loudspeaker arrangement 70 shown in Figure 16 is that voice signal regeneration is installed in respectively on the loud speaker installed surface 75L (75R) with loud speaker 77L (77R) with loud speaker 76L (76R) and surround sound signal regeneration, also can use with two loud speakers of a loud speaker double as.In the case, becoming increases the surround sound signal in voice signal, drive a loud speaker with the signal that has increased the surround sound signal.

Secondly, Figure 20 represents another stereo loudspeaker arrangement 90 as preference.This loudspeaker arrangement 90 is made of with loudspeaker arrangement 91R with loudspeaker arrangement 91L and R channel L channel.

In the audio amplifier 92L that constitutes loudspeaker arrangement 91L, in front and form loud speaker installed surface 93L between the right flank, voice signal regeneration is installed on this loud speaker installed surface 93L with loud speaker 95L with loud speaker 94L and surround sound signal regeneration.At this moment, as shown in figure 21, loud speaker 94L, 95L are installed on the audio amplifier 92L like this, i.e. its main shaft MA _L, SA _LFrontal F with respect to audio amplifier 92L _LThe angle γ of the regulation that tilts in the counterclockwise direction, for example 40 °～50 °.

In addition, on the end face (in figure above) different, be provided with sound wave emission port (opening portion) 97L of the circle that covers with sound-resistance material 96L with the loud speaker installed surface 93L of audio amplifier 92L.This sound wave emission port 97L is used for the air vibration that the back side from the vibrating reed of loud speaker 94L produces is transmitted into the outside as sound wave, forms the axle that runs through its center along the major axes orientation of loud speaker 94L.Though above not explanation, in the inside of audio amplifier 92L, the casing part that loud speaker 94L is installed is spaced mutually with another casing part.

In the case, acoustic capacitance and the acoustic resistance of sound wave emission port 97L and the low-frequency filter that acoustic mass constitutes sound equipment that presents with the air in the casing part that loud speaker 94L is installed of audio amplifier 92L.And, utilize by this low-frequency filter from the sound wave emission port 97L group delay time of emitting sound wave in passband, can give the directivity of following acquisition, promptly in the speaker portion that the loud speaker 94L by loudspeaker arrangement 91L constitutes, be pressed on the place ahead main shaft of loud speaker 94L the directivity that isotropic directivity by having peak response and amphitropic combination obtain from the front of loud speaker 94L and the synthetic sound of these two sound source emitting sound wave of sound wave emission port 97L.

In the audio amplifier 92R that constitutes loudspeaker arrangement 91R, in front and form loud speaker installed surface 93R between the left surface, voice signal regeneration is installed on this loud speaker installed surface 93R with loud speaker 95R with loud speaker 94R and surround sound signal regeneration.At this moment, as shown in figure 21, loud speaker 94R, 95R are installed on the audio amplifier 92R like this, i.e. its main shaft MA _L, SA _LFrontal F with respect to audio amplifier 92R _LThe angle γ of the regulation that tilts along clockwise direction, for example 40 °～50 °.

In addition, on the end face (in figure above) different, be provided with sound wave emission port (opening portion) 97R of the circle that covers with sound-resistance material 96R with the loud speaker installed surface 93R of audio amplifier 92R.This sound wave emission port 97R is used for the air vibration that the back side from the vibrating reed of loud speaker 94R produces is transmitted into the outside as sound wave, forms the axle that runs through its center along the major axes orientation of loud speaker 94R.Though above not explanation, in the inside of audio amplifier 92R, the casing part that loud speaker 94R is installed is spaced mutually with another casing part.

In the case, acoustic capacitance and the acoustic resistance of sound wave emission port 97R and the low-frequency filter that acoustic mass constitutes sound equipment that presents with the air in the casing part that loud speaker 94R is installed of audio amplifier 92R.And, utilize by this low-frequency filter from the sound wave emission port 97R group delay time of emitting sound wave in passband, can give the directivity of following acquisition, promptly in the speaker portion that the loud speaker 94R by loudspeaker arrangement 91R constitutes, be pressed on the place ahead main shaft of loud speaker 94R the directivity that isotropic directivity by having peak response and amphitropic combination obtain from the front of loud speaker 94R and the synthetic sound of these two sound source emitting sound wave of sound wave emission port 97R.

In stereo loudspeaker arrangement 90 shown in Figure 20, the main shaft MA of voice signal regeneration loud speaker 94L, 94R _L, MA _RRespectively with respect to the frontal F of audio amplifier 92L, 92R _L, F _RIn the counterclockwise direction, the tilt angle γ of regulation of clockwise direction, listen to position (with reference to Figure 21), the main shaft MA of loud speaker 94L, 94R from the center line M of loudspeaker arrangement 91L, 91R _L, MA _RTowards the inboard.In addition, the directivity that on the main shaft of the place ahead of loud speaker 94L, 94R, has the combination of amphicheirality by having peak response and isotropic directivity to obtain respectively by the loud speaker 94L of loudspeaker arrangement 91L, 91R, speaker portion that 94R constitutes.

Therefore, beyond on the center line M of loudspeaker arrangement 91L, 91R listen to the position, for example at b point (with reference to Figure 28), the sound pressure level of R channel descends, the sound pressure level of L channel has some risings simultaneously, based on about two sound channels with the difference of range attenuation, it is poor to revise sound pressure level.Therefore, if adopt stereo loudspeaker arrangement 90 shown in Figure 20, then the stereo loudspeaker arrangement 70 with shown in Figure 16 is the same, can enlarge the scope of listening to that obtains good three-dimensional phonoreception.

In addition, in stereo loudspeaker arrangement 90 shown in Figure 20, the main shaft SA of surround sound signal regeneration loud speaker 95L, 95R _L, SA _RRespectively with respect to the frontal F of audio amplifier 92L, 92R _L, F _RThe angle γ of clockwise direction inclination regulation in the counterclockwise direction.Therefore, listen to position (with reference to Figure 21), the main shaft SA of loud speaker 95L, 95R from the center line M of loudspeaker arrangement 91L, 91R _L, SA _RTowards the inboard.Therefore, the same with stereo loudspeaker arrangement 70 shown in Figure 16, listen to the position beyond on the center line M of loudspeaker arrangement 91L, 91R, based on from the surround sound signal tone of the left and right acoustic channels of loud speaker 95L, 95R difference with range attenuation, revise level difference, therefore can enlarge the scope of listening to that obtains good surround sound effect.

In addition, though stereo loudspeaker arrangement 90 shown in Figure 20 is that voice signal regeneration is installed in respectively on the loud speaker installed surface 93L (93R) with loud speaker 95L (95R) with loud speaker 94L (94R) and surround sound signal regeneration, also can use with two loud speakers of a loud speaker double as.In the case, becoming increases the surround sound signal in voice signal, drive a loud speaker with the signal that has increased the surround sound signal.

Like this, Figure 16, stereo loudspeaker arrangement 70 shown in Figure 20,90 owing to the position of listening to from the center line of two loudspeaker arrangements, L channel is used and R channel uses the main shaft of loud speaker towards the inboard with the voice signal regeneration of loudspeaker arrangement, the speaker portion that is made of with loud speaker voice signal regeneration of these two loudspeaker arrangements has the directivity that the combination by amphicheirality and isotropic directivity obtains simultaneously, so listen to the position beyond on the center line of two loudspeaker arrangements, based on about two sound channels with the difference of range attenuation, it is poor to revise sound pressure level, can enlarge the scope of listening to that can obtain good three-dimensional phonoreception.

In addition, the speaker portion that is made of with loud speaker voice signal regeneration of two loudspeaker arrangements is the parts with directivity that the combination by amphicheirality and isotropic directivity obtains, for example utilize from the group delay time of sound wave emission port emitting sound wave, can obtain directivity, with the directivity of utilizing loud speaker itself to have like that in the past or utilize the part of amphicheirality's loud speaker to compare, help making the system configuration miniaturization.

In addition, owing to the position of listening to from the center line of two loudspeaker arrangements, make L channel with and the main shaft of the loud speaker of the surround sound signal regeneration of the loudspeaker arrangement used of R channel towards the inboard, so listen to the position beyond on the center line of two loudspeaker arrangements, utilization makes the directivity of medium-high frequency of the loud speaker of surround sound signal regeneration, based on about two sound channels with the difference of range attenuation, can carry out the correction of level difference, also have the effect of listening to expanded range of above-mentioned voice signal (LR signal) regeneration sound simultaneously, can also enlarge the scope of listening to that can obtain good stereophonic effect significantly in addition.

In addition, the acoustic capacitance that is presented by the acoustic resistance and the air in acoustic mass and the audio amplifier of sound wave emission port constitutes low-frequency filter, utilize by this low-frequency filter from the group delay time of sound wave emission port emitting sound wave in passband, obtain directivity, irrespectively set the group delay time arbitrarily with the size and dimension of audio amplifier, prevent ultralow frequency can both stably obtain desirable directivity.

Secondly, Figure 22 represents another positive stereo loudspeaker arrangement 110 as preference.This loudspeaker arrangement 110 is made of with loudspeaker arrangement 111R with loudspeaker arrangement 111L and R channel L channel.

Loudspeaker arrangement 111L is a kind of loudspeaker arrangement of two-way mode, constitutes the front that voice signal regeneration is installed in the audio amplifier 112L that roughly is rectangular-shaped with the bass horn 113L and the loudspeaker 114L of loud speaker.Bass horn 113L and loudspeaker 114L are installed in front one side of audio amplifier 112L like this,, make the frontal of its main shaft towards audio amplifier 112L that is.In addition, on audio amplifier 112L, the upper portion at the angle that will be made of its front and right flank cuts away, and forms loud speaker installed surface 115L, and the surround sound signal regeneration is installed on this installed surface 115L with loud speaker 116L.At this moment, as shown in figure 23, loud speaker 116L is installed on the audio amplifier 112L like this, i.e. its main shaft MA _LFrontal F with respect to audio amplifier 112L _LThe angle [alpha] of the regulation that tilts in the counterclockwise direction, for example 40 °～50 °.

Loudspeaker arrangement 111R is a kind of loudspeaker arrangement of two-way mode, constitutes the front that voice signal regeneration is installed in the audio amplifier 112R that roughly is rectangular-shaped with the bass horn 113R and the loudspeaker 114R of loud speaker.Bass horn 113R and loudspeaker 114R are installed in front one side of audio amplifier 112R like this,, make the frontal of its main shaft towards audio amplifier 112R that is.In addition, on audio amplifier 112R, the upper portion at the angle that will be made of its front and left surface cuts away, and forms loud speaker installed surface 115R, and the surround sound signal regeneration is installed on this installed surface 115R with loud speaker 116R.At this moment, as shown in figure 23, loud speaker 116R is installed on the audio amplifier 112R like this, i.e. its main shaft MA _RFrontal F with respect to audio amplifier 112R _RThe angle [alpha] of the regulation that tilts along clockwise direction, for example 40 °～50 °.

In positive stereo loudspeaker arrangement 110 shown in Figure 22, the main shaft MA of loud speaker 116L, 116R _L, MA _RRespectively with respect to the frontal F of audio amplifier 112L, 112R _L, F _RThe angle [alpha] of clockwise direction inclination regulation in the counterclockwise direction.Therefore, listen to position (with reference to Figure 23), the main shaft MA of loud speaker 116L, 116R from the center line M of loudspeaker arrangement 111L, 111R _L, MA _RTowards the inboard.

In general, the S signal component as the fundamental component of surround sound signal is the signal that has fundamental component in the medium-high frequency.And the vibrating reed of loud speaker 116L, 116R has limited area, so as shown in figure 34, emission sound wave itself just has directivity in medium-high frequency.

Therefore, as mentioned above, because the main shaft MA of loud speaker 116L, 116R _L, MA _RTowards the inboard, so beyond on center line M listen to the position, for example at f point (with reference to Figure 31), the sound pressure level of R channel descends, the sound pressure level of L channel has some risings simultaneously, based on about the surround sound signal tone of two sound channels with the difference of range attenuation, revise level difference.Therefore, if adopt positive stereo loudspeaker arrangement 110 shown in Figure 22, then can enlarge the scope of listening to that obtains good surround sound effect.

The applicant as mentioned above, in order to confirm whether to have enlarged the scope of listening to that obtains good surround sound effect, has carried out bearing test in positive stereo loudspeaker arrangement 110 shown in Figure 22.Figure 24 is illustrated in this bearing test, the loudspeaker arrangement 120 that uses with loudspeaker arrangement with loudspeaker arrangement and R channel as L channel.This loudspeaker arrangement 120 is to have disposed loudspeaker arrangement 125 on the top of loudspeaker arrangement 121.Loudspeaker arrangement 121 is loudspeaker arrangements of a kind of two-way mode, in the audio amplifier 122 of wide=20cm, length=22cm, height=30cm, the bore that voice signal regeneration usefulness has been installed is the bass horn 123 of 14cm and the loudspeaker 124 that bore is 8cm, and reproduction band is 50Hz～20kHz.In addition, loudspeaker arrangement 125 is in the airtight audio amplifier 126 of wide=9cm, length=7cm, height=9cm, and it is 8cm surround sound signal regeneration loud speaker 127 that bore has been installed, and reproduction band is 300Hz～20kHz.

Use loudspeaker arrangement 120 shown in Figure 24 as L channel with loudspeaker arrangement and R channel loudspeaker arrangement, under state shown in Figure 25, it is configured in the reverberation time is about in 0.2 second the listening room 100 and has carried out bearing test.And, in this bearing test, make constitute L channel with and the main shaft (reference axis) of the bass horn 123 of the loudspeaker arrangement 121 of the loudspeaker arrangement 120 used of R channel and loudspeaker 124 towards frontal (direction that is parallel to the sidewall of listening room 100), under this state, recorded the scope of listening to that can obtain good surround sound effect under following three kinds of situations, these three kinds of situations are: 1. make tilt laterally 30 ° situation of the main shaft of the loud speaker 127 of loudspeaker arrangement 125; 2. the main shaft of loud speaker 127 that makes loudspeaker arrangement 125 is towards the situation of frontal; 3. make tilt to the inside 45 ° situation of the main shaft of the loud speaker 127 of loudspeaker arrangement 125.

In Figure 25, dotted line L _-11Be illustrated in the surround sound signal regeneration is tilted under 30 ° the situation laterally with the main shaft of loud speaker 127, can obtain the boundary of the scope of listening to of good surround sound effect, from this dotted line L _-11To the scope of center line M one side, obtained good surround sound effect.In addition, chain-dotted line L _-12Be illustrated in make loud speaker 127 main shaft under the situation of frontal, can obtain the boundary of the scope of listening to of good surround sound effect, from this chain-dotted line L _-12To the scope of center line M one side, obtained good surround sound effect.In the case, compare with tilt laterally 30 ° situation of the main shaft that makes loud speaker 127, can obtain good surround sound effect to have listened to expanded range some.

Different therewith, solid line L _-13Be illustrated in the main shaft that makes loud speaker 127 and tilt to the inside under 45 ° the situation, can obtain the boundary of the scope of listening to of good surround sound effect, from this solid line L _-13To the scope of center line M one side, obtained good surround sound effect.In the case, compare towards the situation of frontal, further enlarged the scope of listening to that can obtain good surround sound effect with the main shaft that makes loud speaker 127.Therefore, in front surround sound loudspeaker arrangement 110 shown in Figure 22, confirmed to enlarge the scope of listening to that can obtain good surround sound effect.

Secondly, Figure 26 represents another positive stereo loudspeaker arrangement 130 as preference.This loudspeaker arrangement 130 is made of with loudspeaker arrangement 131R with loudspeaker arrangement 131L and R channel L channel.

In the audio amplifier 132L that constitutes loudspeaker arrangement 131L, in front and form loud speaker installed surface 133L between the right flank.And loudspeaker arrangement 131L is a kind of loudspeaker arrangement of two-way mode, and bass horn 134L and loudspeaker 135L are installed on this loud speaker installed surface 133L.Bass horn 134L and loudspeaker 135L regenerate with the function of loud speaker except having as voice signal, also have as the function of surround sound signal regeneration with loud speaker.At this moment, as shown in figure 27, bass horn 134L and loudspeaker 135L are installed on the audio amplifier 132L like this, i.e. its main shaft MA _LFrontal F with respect to audio amplifier 132L _LThe angle beta of the regulation that tilts in the counterclockwise direction, for example 40 °～50 °.

In addition, in the audio amplifier 132R that constitutes loudspeaker arrangement 131R, in front and form loud speaker installed surface 133R between the left surface.And loudspeaker arrangement 131R is a kind of loudspeaker arrangement of two-way mode, and bass horn 134R and loudspeaker 135R are installed on this loud speaker installed surface 133R.Bass horn 134R and loudspeaker 135R regenerate with the function of loud speaker except having as voice signal, also have as the function of surround sound signal regeneration with loud speaker.At this moment, as shown in figure 27, bass horn 134R and loudspeaker 135R are installed on the audio amplifier 132R like this, i.e. its main shaft MA _RFrontal F with respect to audio amplifier 132R _RThe angle beta of the regulation that tilts along clockwise direction, for example 40 °～50 °.

In front surround sound loudspeaker arrangement 130 shown in Figure 26, make the loud speaker (134L, 135L) of surround sound signal regeneration, the main shaft MA of (134R, 135R) _L, MA _RRespectively with respect to the frontal F of audio amplifier 132L, 132R _L, F _RThe angle beta of clockwise direction inclination regulation in the counterclockwise direction.Therefore, listen to position (with reference to Figure 27), the main shaft MA of loud speaker (134L, 135L), (134R, 135R) from the center line M of loudspeaker arrangement 131L, 131R _L, MA _RTowards the inboard.Therefore, the same with front surround sound loudspeaker arrangement 110 shown in Figure 22, listen to the position beyond on the center line M of loudspeaker arrangement 131L, 131R, based on from the surround sound signal tone of two sound channels about loud speaker (134L, 135L), (134R, 135R) difference with range attenuation, revise level difference, can enlarge the scope of listening to that obtains good surround sound effect.

In addition, be shown in the example though loudspeaker arrangement 110,130 is loudspeaker arrangements in the two-way mode, be not limited to this mode certainly.Main points be to make L channel with and the loud speaker of the surround sound signal regeneration of the loudspeaker arrangement used of R channel be installed on the audio amplifier like this, that is, make loud speaker main shaft separately reach the angle that clockwise direction tilts to stipulate in the counterclockwise direction with respect to the frontal of audio amplifier.

Figure 22, front surround sound loudspeaker arrangement shown in Figure 26 110,130 are owing to listen to the position from the center line of two loudspeaker arrangements like this, make L channel with and the main shaft of the loud speaker of the surround sound signal regeneration of the loudspeaker arrangement used of R channel towards the inboard, therefore, utilization makes the directivity of medium-high frequency of the loud speaker of surround sound signal regeneration, can revise by about the surround sound signal tone of two sound channels with the level difference that the difference of range attenuation causes, therefore can enlarge the scope of listening to of the good surround sound effect of acquisition.

The possibility of industrial utilization

As mentioned above, loudspeaker arrangement of the present invention is owing to can enlarge acquisition good three-dimensional phonoreception Listen to the scope of listening to of the good surround sound effect of scope and acquisition, so for example be applicable to Television receiver and audio system etc.

Claims (13)

1. stereo loudspeaker arrangement, it is made of with loudspeaker arrangement with loudspeaker arrangement and R channel L channel, above-mentioned L channel has first loud speaker that makes the regeneration of L channel voice signal with loudspeaker arrangement, above-mentioned R channel has second loud speaker that makes the right channel sound signal regeneration with loudspeaker arrangement, and this stereo loudspeaker arrangement is characterised in that:

First the raise one's voice part and second raise one's voice directivity is partly all arranged with what above-mentioned second loud speaker of loudspeaker arrangement constituted that constitutes with above-mentioned first loud speaker of loudspeaker arrangement by above-mentioned L channel by above-mentioned R channel, this directivity is that the combination of the amphicheirality by having peak response on the main shaft of the place ahead of loud speaker and isotropic directivity respectively obtains

Above-mentioned L channel is installed in the audio amplifier respectively with first loud speaker of loudspeaker arrangement and above-mentioned R channel second loud speaker with loudspeaker arrangement, and makes main shaft separately reach clockwise direction first angle that tilts respectively in the counterclockwise direction with respect to the frontal of audio amplifier;

Above-mentioned L channel is raised one's voice part and above-mentioned R channel with above-mentioned second of the loudspeaker arrangement part of raising one's voice with first of loudspeaker arrangement,

Respectively loud speaker is installed on the end face of audio amplifier, on the end face different, is provided with the sound wave emission port that utilizes sound-resistance material to cover simultaneously with an above-mentioned end face of above-mentioned audio amplifier,

The acoustic capacitance, the acoustic resistance of above-mentioned sound wave emission port and the low-frequency filter that acoustic mass constitutes sound equipment that present by the air in the above-mentioned audio amplifier,

Utilize by above-mentioned low-frequency filter from the above-mentioned group delay time of sound wave emission port emitting sound wave in passband, making from the front of above-mentioned loud speaker and the synthetic sound pressing element of these two sound source emitting sound wave of sound wave emission port has directivity, and this directivity is to obtain by isotropic directivity that has peak response on the main shaft of the place ahead of above-mentioned loud speaker and amphitropic combination.

2. stereo loudspeaker arrangement according to claim 1 is characterized in that:

Above-mentioned first angle is 40 °～50 °.

3. stereo loudspeaker arrangement, it is made of with loudspeaker arrangement with loudspeaker arrangement and R channel L channel, above-mentioned L channel has first and second loud speaker that makes the regeneration of L channel voice signal with loudspeaker arrangement, above-mentioned R channel has the 3rd and the 4th loud speaker that makes the right channel sound signal regeneration with loudspeaker arrangement, and this stereo loudspeaker arrangement is characterised in that:

First the raise one's voice part and second raise one's voice directivity is partly all arranged with what above-mentioned the 4th loud speaker of loudspeaker arrangement constituted that constitutes with above-mentioned second loud speaker of loudspeaker arrangement by above-mentioned L channel by above-mentioned R channel, this directivity is that the combination of the amphicheirality by having peak response on the main shaft of the place ahead of loud speaker and isotropic directivity respectively obtains

Above-mentioned L channel is installed in the audio amplifier respectively with above-mentioned first loud speaker of loudspeaker arrangement and above-mentioned R channel above-mentioned the 3rd loud speaker with loudspeaker arrangement, and makes main shaft separately consistent with the frontal of audio amplifier,

Above-mentioned L channel is installed in the audio amplifier respectively with above-mentioned second loud speaker of loudspeaker arrangement and above-mentioned R channel above-mentioned the 4th loud speaker with loudspeaker arrangement, and makes main shaft separately reach clockwise direction first angle that tilts respectively in the counterclockwise direction with respect to the frontal of audio amplifier.

4. stereo loudspeaker arrangement according to claim 3 is characterized in that:

Above-mentioned L channel is raised one's voice part and above-mentioned R channel with above-mentioned second of the loudspeaker arrangement part of raising one's voice with first of loudspeaker arrangement

Respectively loud speaker is installed on the end face of audio amplifier, on the end face different, is provided with the sound wave emission port that utilizes sound-resistance material to cover simultaneously with an above-mentioned end face of above-mentioned audio amplifier,

The acoustic capacitance, the acoustic resistance of above-mentioned sound wave emission port and the low-frequency filter that acoustic mass constitutes sound equipment that present by the air in the above-mentioned audio amplifier,

Utilize by above-mentioned low-frequency filter from the above-mentioned group delay time of sound wave emission port emitting sound wave in passband, making from the front of above-mentioned loud speaker and the synthetic sound pressing element of these two sound source emitting sound wave of sound wave emission port has directivity, and this directivity is to obtain by isotropic directivity that has peak response on the main shaft of the place ahead of above-mentioned loud speaker and amphitropic combination.

5. stereo loudspeaker arrangement according to claim 3 is characterized in that:

Above-mentioned first angle is 40 °～50 °.

6. stereo loudspeaker arrangement, it is made of with loudspeaker arrangement with loudspeaker arrangement and R channel L channel, above-mentioned L channel has first loud speaker that makes the regeneration of L channel voice signal and second loud speaker that makes the surround sound signal regeneration with loudspeaker arrangement, above-mentioned R channel has the 3rd loud speaker that makes the right channel sound signal regeneration and the 4th loud speaker that makes the surround sound signal regeneration with loudspeaker arrangement, and this stereo loudspeaker arrangement is characterised in that:

Above-mentioned L channel is installed in the audio amplifier with above-mentioned first loud speaker of loudspeaker arrangement and above-mentioned R channel above-mentioned the 3rd loud speaker with loudspeaker arrangement, and make main shaft separately reach clockwise direction first angle that tilts respectively in the counterclockwise direction with respect to the frontal of audio amplifier

Above-mentioned L channel is installed in the audio amplifier with above-mentioned second loud speaker of loudspeaker arrangement and above-mentioned R channel above-mentioned the 4th loud speaker with loudspeaker arrangement, and making separately main shaft reach clockwise direction respectively in the counterclockwise direction with respect to the frontal of audio amplifier tilts and the second identical or different angle of above-mentioned first angle

First the raise one's voice part and second raise one's voice that directivity, this directivity are all arranged is the combination acquisition of the amphicheirality by having peak response on the main shaft of the place ahead of loud speaker and isotropic directivity respectively to part with what above-mentioned the 3rd loud speaker of loudspeaker arrangement constituted that constitutes with above-mentioned first loud speaker of loudspeaker arrangement by above-mentioned L channel by above-mentioned R channel.

7. stereo loudspeaker arrangement according to claim 6 is characterized in that:

Above-mentioned L channel is raised one's voice part and above-mentioned R channel with above-mentioned second of the loudspeaker arrangement part of raising one's voice with first of loudspeaker arrangement

Respectively loud speaker is installed on the end face of audio amplifier, on the end face different, is provided with the sound wave emission port that utilizes sound-resistance material to cover simultaneously with an above-mentioned end face of above-mentioned audio amplifier,

The acoustic capacitance, the acoustic resistance of above-mentioned sound wave emission port and the low-frequency filter that acoustic mass constitutes sound equipment that present by the air in the above-mentioned audio amplifier,

Utilize by above-mentioned low-frequency filter from the above-mentioned group delay time of sound wave emission port emitting sound wave in passband, making from the front of above-mentioned loud speaker and the synthetic sound pressing element of these two sound source emitting sound wave of sound wave emission port has directivity, and this directivity is to obtain by isotropic directivity that has peak response on the main shaft of the place ahead of above-mentioned loud speaker and amphitropic combination.

8. stereo loudspeaker arrangement according to claim 6 is characterized in that:

Above-mentioned first and second angle is 40 °～50 °.

9. stereo loudspeaker arrangement according to claim 6 is characterized in that:

Use in the loudspeaker arrangement at above-mentioned L channel, above-mentioned first loud speaker and above-mentioned second loud speaker that makes the surround sound signal regeneration that makes the regeneration of L channel voice signal of dual-purpose,

Use in the loudspeaker arrangement above-mentioned the 3rd loud speaker and above-mentioned the 4th loud speaker that makes the surround sound signal regeneration that makes the right channel sound signal regeneration of dual-purpose at above-mentioned R channel.

10. stereo loudspeaker arrangement, it is made of with loudspeaker arrangement with loudspeaker arrangement and R channel L channel, above-mentioned L channel has first and second loud speaker that makes the regeneration of L channel voice signal and the 3rd loud speaker that makes the surround sound signal regeneration with loudspeaker arrangement, above-mentioned R channel has the 4th and the 5th loud speaker that makes the right channel sound signal regeneration and the 6th loud speaker that makes the surround sound signal regeneration with loudspeaker arrangement, and this stereo loudspeaker arrangement is characterised in that:

Above-mentioned L channel is installed in the audio amplifier with above-mentioned first loud speaker of loudspeaker arrangement and above-mentioned R channel above-mentioned the 4th loud speaker with loudspeaker arrangement, and makes main shaft separately consistent with the frontal of audio amplifier,

Above-mentioned L channel is installed in the audio amplifier with above-mentioned second loud speaker of loudspeaker arrangement and above-mentioned R channel above-mentioned the 5th loud speaker with loudspeaker arrangement, and make main shaft separately reach clockwise direction first angle that tilts respectively in the counterclockwise direction with respect to the frontal of audio amplifier

Above-mentioned L channel is installed in the audio amplifier with above-mentioned the 3rd loud speaker of loudspeaker arrangement and above-mentioned R channel above-mentioned the 6th loud speaker with loudspeaker arrangement, and making separately main shaft reach clockwise direction respectively in the counterclockwise direction with respect to the frontal of audio amplifier tilts and the second identical or different angle of above-mentioned first angle

First the raise one's voice part and second raise one's voice that directivity, this directivity are all arranged is the combination acquisition of the amphicheirality by having peak response on the main shaft of the place ahead of loud speaker and isotropic directivity respectively to part with what above-mentioned the 5th loud speaker of loudspeaker arrangement constituted that constitutes with above-mentioned second loud speaker of loudspeaker arrangement by above-mentioned L channel by above-mentioned R channel.

11. stereo loudspeaker arrangement according to claim 10 is characterized in that:

Above-mentioned L channel is raised one's voice part and above-mentioned R channel with above-mentioned second of the loudspeaker arrangement part of raising one's voice with first of loudspeaker arrangement

Respectively loud speaker is installed on the end face of audio amplifier, on the end face different, is provided with the sound wave emission port that utilizes sound-resistance material to cover simultaneously with an above-mentioned end face of above-mentioned audio amplifier,

The acoustic capacitance, the acoustic resistance of above-mentioned sound wave emission port and the low-frequency filter that acoustic mass constitutes sound equipment that present by the air in the above-mentioned audio amplifier,

Utilize by above-mentioned low-frequency filter from the above-mentioned group delay time of sound wave emission port emitting sound wave in passband, making from the front of above-mentioned second loud speaker and the synthetic sound pressing element of these two sound source emitting sound wave of sound wave emission port has directivity, and this directivity is to obtain by isotropic directivity that has peak response on the main shaft of the place ahead of above-mentioned second loud speaker and amphitropic combination.

12. stereo loudspeaker arrangement according to claim 10 is characterized in that:

Above-mentioned first and second angle is 40 °～50 °.

13. stereo loudspeaker arrangement according to claim 10 is characterized in that:

Use in the loudspeaker arrangement at above-mentioned L channel, above-mentioned second loud speaker and above-mentioned the 3rd loud speaker that makes the surround sound signal regeneration that makes the regeneration of L channel voice signal of dual-purpose,

Use in the loudspeaker arrangement above-mentioned the 5th loud speaker and above-mentioned the 6th loud speaker that makes the surround sound signal regeneration that makes the right channel sound signal regeneration of dual-purpose at above-mentioned R channel.

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