Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R1/00—Details of transducers, loudspeakers or microphones
  • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
  • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
  • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
  • H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R1/00—Details of transducers, loudspeakers or microphones
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
  • G03B21/00—Projectors or projection-type viewers; Accessories therefor
  • G03B21/54—Accessories
  • G03B21/56—Projection screens
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N5/00—Details of television systems
  • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R1/00—Details of transducers, loudspeakers or microphones
  • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
  • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
  • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R3/00—Circuits for transducers, loudspeakers or microphones
  • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N9/00—Details of colour television systems
  • H04N9/12—Picture reproducers
  • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
  • H04N9/3141—Constructional details thereof
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
  • H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
  • H04R2201/401—2D or 3D arrays of transducers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
  • H04R2205/022—Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
  • H04R2430/20—Processing of the output signals of the acoustic transducers of an array for obtaining a desired directivity characteristic
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04S—STEREOPHONIC SYSTEMS 
  • H04S3/00—Systems employing more than two channels, e.g. quadraphonic

Definitions

• the present invention relates to a speaker device with a projection screen suitable for use in reproducing content such as a movie.
• a panel-type array speaker in which a plurality of speaker units are arranged one-dimensionally or two-dimensionally has extremely high directional characteristics and sound field characteristics compared to conventional individual speakers. It can be changed or set at any time.
• the directional characteristics of the array speakers are made into a beam shape, and different audio services are provided for different listeners (listeners).
• the sound source direction can be set substantially arbitrarily by providing sound waves to the listener after reflecting the sound on the ceiling or wall surface.
• various forms of loudspeaker systems can be configured, such as controlling a wavefront of a sound wave radiated from an array loudspeaker to simulate a point sound source or a surface sound source, or performing silencing at a specific position.
• a speaker system that arranges one arra-spee force in front of the listening position and reproduces sound of two or more channels with only one arra-spee force is a special feature. It has been proposed in Japanese Unexamined Patent Publication No. Hei 9-233335, and Japanese Unexamined Patent Publication No. Hei 6-205496.
• This speed system is the sound of a system that plays audio along with video such as a movie. It is suitable for voice reproduction.
• sound waves radiated from the array speaker are reflected as beam-like directivity on the side wall, rear wall, ceiling, etc. of the listener and reach the listener, as if the sound waves were finally reflected.
• the sound source is perceived as if there is a sound source in the direction of the wall, and the sound image localization in all directions can be performed with only one panel's arspy force placed in front of the listener.For example, a 5.1-channel multi-channel Surround playback becomes possible.
• the listening environment (listening room) is a room like a normal rectangular parallelepiped, and there are walls 14 L and 14 R on the left and right sides of the listener 12, and above the listener 12 There is a ceiling 14 C, and the listener sits on a chair placed on the floor 14 G.
• a video projector 13 is attached to the ceiling 14 C of the room as shown in FIG. 2, and a wall 14 F on the front of the room is viewed from the listener 12.
• a projection screen 11 for displaying an image projected from the video projector 13 is provided below the projection screen 11, there is arranged an alloy speed 10. In this example, the listener 1 2 sits down looking at the projection screen 11 1.
• the speaker unit drive signal is generated for each audio signal of each channel of the multi-channel surround signal, and is generated so that the directivity of the sound wave from the array speaker by each signal becomes desired.
• the sound wave from the array speaker has a beam-like directivity, reflects off the right wall 14 R of the listener 12, then reaches the listener 12 and is heard Thus, a plurality of speaker unit drive signals are generated.
• the sound wave from the array speaker has a beam-like directivity, and is reflected by the left wall 14 L of the listener 12 and reaches the listener 12.
• a plurality of speaker unit drive signals are generated so as to be listened to.
• a plurality of speed unit drive signals are generated from the center channel audio signal so that the sound wave from the array speaker 10 directly reaches the listener 12 and is heard. Furthermore, from the audio signals of the rear left and right channels, the sound wave from the array speaker has a beam-like directivity and is reflected on the ceiling, the left and right walls of the listener and the rear wall, and then reaches the listener 12. A plurality of speaker drive signals are generated to be heard.
• the listeners 12 are located below the projection screen 11 on the front of the room because the listener 12 feels as if there is a sound source of each channel even in the direction of arrival of the sound wave.
• 5.1-channel multi-channel surround playback can be performed.
• the panel-shaped loudspeaker 10 requires a small occupied floor space for installation, and even if the size of the room changes, changing the radiation direction of the beam-like sound waves makes it possible to achieve a desired stereo feeling. Channels ⁇ Excellent quality of surround sound.
• the localization of the sound of the center channel which is made to directly reach the listener 12, particularly, because the aligning force 10 is installed below the projection screen 11.
• the position will be the position of the area below the projection screen 11.
• Audio information recorded on DVDs (Digital Versatile D isc) etc. as a multi-channel surround system together with image information is transmitted to the center channel or left and right front channels, as in a movie theater screening system. It is designed to localize the sound image on the screen, and it is an unnatural reproduction sound field for the sound channel to be located below the projection screen 11.
• the sound of the center channel is correctly localized at the center of the screen because the sound is played with the speed placed behind the screen, that is, behind the screen, as viewed by the audience. Disclosure of the invention
• An object of the present invention is to provide a novel array speaker device with a projection screen that can solve the problems of the conventional technology as described above.
• Another object of the present invention is to provide an array speaker device with a projection screen in which the sound image localization position of the sound of the center channel is located at the center of the projection screen.
• An array speaker device with a projection screen according to the present invention proposed to achieve the object as described above has a plurality of speaker units, an opening, and a plurality of speaker units each having a diaphragm.
• a plurality of cabinets that are housed in such a manner that they are located on the inner side of the opening, and a projection screen for displaying a projected image, which is a sound-permeable screen. Are arranged so that they are flush with each other, and the projection screen is mounted in contact with or close to the opening.
• the projection screen is extended on the cabinet opening side so as to cover all surfaces having openings of the plurality of cabinets.
• a cushioning material is provided on the surface of the cabinet having the opening.
• the projection screen is extended in contact with the cushioning material so as to cover all surfaces having openings of the plurality of cabinets.
• a frame is provided around the plurality of cabinets, and the projection screen is spread on the frame.
• the device includes a power amplifier for generating a unit drive signal to be supplied to each of the plurality of speaker units.
• This power amplifier has a plurality of output channels, and integrally forms a plurality of speed units and a plurality of cabinets corresponding to the number of output channels of the power amplifier.
• the apparatus according to the present invention further includes a directivity forming circuit composed of a plurality of filter circuits, wherein an input audio signal is input to the plurality of filter circuits, and an output of each filter circuit is output to the plurality of filter circuits.
• a directivity forming circuit composed of a plurality of filter circuits, wherein an input audio signal is input to the plurality of filter circuits, and an output of each filter circuit is output to the plurality of filter circuits.
• Another array speaker device with a projection screen is a speaker unit.
• a cabinet having an opening and accommodating the speaker unit such that the diaphragm is on the inner side of the opening, and a sound-transmitting screen for displaying a projected image, wherein the cabinet has an opening.
• a plurality of speaker modules each including a projection screen extending on the opening side of the cabinet so as to cover the surface having the projection screen.
• FIG. 1 is a perspective view showing a configuration example of an AV system using a conventional array speaker device.
• FIG. 2 is a side view showing a configuration example of an AV system using a conventional array speaker device.
• FIG. 3 is a side view showing a configuration example of an AV system using the array speaker device with a projection screen according to the present invention.
• FIG. 4 is an assembled perspective view showing the joints constituting the present invention.
• FIG. 5 is an enlarged perspective view showing a part of the array speaker.
• FIG. 6 is a side sectional view showing a part of an array speaker in an enlarged manner.
• FIG. 7 is a perspective view showing an array speaker.
• FIG. 8 is a perspective view showing the entire array speaker device with a projection screen according to the present invention.
• FIG. 9 is a sectional view showing a main part of an array speaker device with a projection screen according to the present invention.
• FIG. 10 is a diagram showing one channel of the audio signal of the audio signal generation circuit for an array speaker used in the present invention.
• FIG. 11 is a side view for explaining the system configuration for measuring the frequency characteristics of radiated sound by the array speaker device with a projection screen according to the present invention.
• FIG. 12 is a diagram showing the frequency characteristics of the sound radiated from the speaker.
• FIGS. 13A to 13E are diagrams illustrating examples of frequency characteristics of sound waves transmitted from a speaker through a projection screen.
• FIG. 14 is a side sectional view showing another example of the array speaker device according to the present invention.
• FIG. 15 is a plan view showing an example of the arrangement of speaker units used in the array speaker device according to the present invention.
• FIG. 3 shows an arrangement example of an AV (Audio and Visual) system configured by using the array speaker device according to the present invention.
• the projection screen 20 has an array speaker. It is provided and configured on the front side, which is the acoustic radiation surface of the force 30.
• a sound-transmitting screen is used as the projection screen 20, in this example.
• the sound-transmitting screen has a large number of fine holes made at predetermined intervals.
• the array speaker device 100 is provided on the front wall 14F side of the room as viewed from the listener 12 and the image projected by the video projector 13 is projected onto a projection screen. 20 will be displayed on top. Otherwise, the configuration is the same as that of the AV system shown in Figs. 1 and 2 described above.
• FIGS. 3 to 6 show the configuration of the array speaker 30 used in the present invention.
• the array speaker 30 of this example includes an array speaker body 31 and a frame 32, and the array speaker body 31 is housed in a frame 32.
• the projection screen 20 is fixed to the frame 32 and fixed to the upper and lower sides, the left and right sides, or the four sides of the upper, lower, left, and right sides.
• the array speaker 30 of this example has a plurality of speaker units 33 constituting the array speaker body 31 each having an individual speaker power unit cabinet 41. Is stored.
• the cabinet 41 has a substantially cubic or rectangular parallelepiped shape, and is mounted so that the speaker unit 33 is accommodated therein.
• the speaker unit 33 for example, a small dome type unit having a diameter of 8 cm is used.
• the diaphragm 34 of each speaker unit 33 is exposed to the outside through the opening of the cabinet 41, and the sound wave caused by the vibration of the speaker unit 33 from the opening side of the cabinet 41. It is radiated.
• FIG. 6 shows a cross-sectional view of one cabinet 41 to which the speaker unit 33 is attached.
• the speaker unit 33 has a top 34 t of the diaphragm 34 that is closer to the inside of the cabinet 41 than the end surface 41 a of the speaker unit 33 of the cabinet 41 as shown in FIG. 6. Attached to the cabinet 41.
• the projection screen 20 is also extended when the projection screen 20 is extended so as to be in close contact with or in contact with the end surface 41 a of the speaker unit 33 of the cabinet 41 on the sound wave emission side. This is to prevent the speaker unit 3 from coming into contact with the diaphragm 34 of the speaker unit 33.
• a back air chamber is formed on the back surface of the speed unit 33 opposite to the diaphragm 34 side, and the back air chamber is formed.
• a sound absorbing material 42 such as glass wool is filled or affixed to the inside or a part of the wall of the air chamber.
• FIG. 6 shows an example in which a sound absorbing material 42 such as glass wool is filled.
• a cushioning material 43 made of felt, rubber, gel rubber, foamed polyurethane, or the like is provided on the end surface 41 a of the speaker unit 33 of the cabinet 41 on the sound wave emitting side. It is affixed in the shape of a letter. 6 and 7, illustration of the cushioning material 43 is omitted.
• the cabinet 41 to which the speaker unit 33 is attached as described above exposes the diaphragms 34 of the speaker unit 33 all in the same direction.
• a plurality of two-dimensional arrays are arranged so that they are arranged as if they were arranged in a row.
• a ray speaker body 31 is configured.
• a speaker terminal to which a speaker unit drive signal to be supplied to the speaker unit 33 is input is provided on the back side of the speaker unit 33 of each cabinet 41.
• the frame 32 includes an opening space 35 serving as a storage space for the array speaker main body 31 as shown in FIG.
• the dimensions of the height, width, and depth are larger than the dimensions of the height, width, and depth of the array speaker body 31 having the above-described configuration, as shown in FIG.
• the array speaker main body 31 is housed in the frame 32 such that the periphery thereof is surrounded by the frame 32 in the opening space 35.
• the sound wave radiating surface of the array speaker 30, that is, the surface formed by the end faces 41 a of the plurality of cabinets 41 and the portion forming the opening space 35 of the frame 32, has a sound wave of 30 ⁇ .
• the end surface 32 a on the radiation surface side is made to be flush.
• the projection screen 20 is extended and fixed to the frame 32 on the sound wave emitting surface side of the array speaker 30 formed as described above.
• the projection screen 20 is a peripheral portion of the frame 32 and is fixed by a holding plate 36 in the example shown in FIG.
• the frame 32 is made of a strong material that can sufficiently withstand the tension of the projection screen 20 and is configured to have a structure having such strength.
• the holding plate 36 has the same shape slightly larger than the frame 32, and the four sides of the projection screen 20 are sandwiched between the frame 32 and the projection screen 20. 0 may be expanded.
• the holding plate 36 is an independent plate for the top, bottom, left and right, and between those plates and the frame 32, the projection screen The four sides may be sandwiched, and fixed with fixing screws.
• the projection screen 20 is, as shown in FIG. 9, a cushioning material formed on the end face 41 a of each speaker unit unit 41 of the speaker unit 31. 4 It comes into contact or close contact with 3.
• the array speaker body 31 is pressed against the projection screen 20 with the end face 41 a side of the cabinet 41. In this way, the array speaker body 31 can be mounted in the opening space 35 of the frame 32.
• the array speaker main body 31 and the projection screen 20 are attached to the respective end faces 41a of the plurality of cabinets 41 for the speed unit as shown in FIG.
• the cushioning material 43 is fixed to the frame 32 in a state where the cushioning material 43 is in contact with the rear surface of the projection screen 20.
• the cushioning material 43 of each speaker unit cabinet 41 and the projection screen 20 may be fixed with an adhesive or the like, but in order to cope with repair replacement of the speaker unit 33, etc. Desirably not fixed. Moreover, even if the rear surface of the projection screen 20 is not closely attached to the cushioning material 43 and is close to the space, as described later, the array speaker 30 of this example is sufficient. Therefore, there is no need to dare to fix the cushioning member 43 and the projection screen 20 with an adhesive or the like.
• the audio signal generation circuit for array speakers generates a plurality of unit drive signals to be supplied to each of the plurality of speaker units 33 from the audio signals of each channel of the multi-channel surround.
• an audio signal generation circuit 50 for an error rate for one channel of the input audio signal will be described below with reference to FIG.
• the circuits 50 of FIG. 10 are provided for the number of channels.
• a control circuit 52 described later can be provided in common for the multiple channels.
• FIG. As described above, the directivity forming signal generation circuit 51, the control circuit 52, the adjustment operation section 53, the channel synthesis circuit 541, 542, 543,..., 54 ⁇ ( ⁇ is the number of the speaker units 33) ) And output amplifiers 551, 552, 553, ⁇ , 55 ⁇ .
• the audio input signal of the channel is supplied to the directivity forming signal generation circuit 51 through the audio input terminal S in.
• the directivity forming signal generation circuit 51 configures the main speaker body 31 based on a control signal CT from the control circuit 52 from an input audio signal of the channel input through the audio input terminal Sin.
• a plurality of unit drive signals to be supplied to a plurality of speed units 33 are generated.
• the plurality of unit drive signals are set so that the direction of the main axis of the directivity of sound waves radiated from the array speaker main body 31 in the form of a beam is determined by the control signal CT from the control circuit 52. Generated.
• the control circuit 52 is supplied with an adjustment operation signal from the adjustment operation section 53.
• the adjustment operation section 53 is provided with a knob 531 for adjusting the direction of the main axis of the directivity of the beam sound wave radiated from the array speaker main body 31 and a knob 532 for adjusting the amplitude of the beam sound wave. .
• the direction adjusting knob 5 31 When the direction adjusting knob 5 31 is adjusted, a portion related to the delay amount control of the control signal CT is adjusted, and the unit drive signal from the directivity forming signal generation circuit 51 is adjusted by the control signal CT. The direction of the main axis of the directivity of the beam sound wave determined by the above is adjusted.
• the amplitude adjusting knob 532 When the amplitude adjusting knob 532 is adjusted, a portion related to the amplitude control of the control signal CT is adjusted, and the amplitude (level) of the beam sound wave determined by the unit drive signal is adjusted by the control signal CT. Is done.
• the directivity forming signal generation circuit 51 is composed of the same number of filter circuits 5 1 1, 5 1 2, 5 1 3, 5 1 n as the number of the speech units 33 constituting the array speaker body 3 1. , And the audio signal of the channel input through the input terminal S in is supplied to each of the filter circuits 5 1 1, 5 1 2, 5 13,..., 5 1 ⁇ . Then, as shown in FIG. 10, the control signal CT from the control circuit 52 is composed of the filter circuits 5 1 1, 5 1 2, 5 1 3,... Of the directivity forming signal generation circuit 51. 5 1 ⁇ Are a bundle of a plurality of control signals individually supplied to each of them.
• the filter circuits 511, 512, 513,..., 51n are composed of, for example, an analog filter or a digital filter.
• the input audio signal from the audio input terminal S in is used as a digital audio signal, or the digital audio signal is input at the input stage of the directivity forming signal generation circuit 51. It needs to be converted to a signal.
• each of the filter circuits 5 1 1, 5 1 2, 5 1 3, ..., 5 1n is composed of analog filters
• the capacitance value of the variable capacitance element and the resistance value of the variable resistor are controlled, for example.
• the delay time and amplitude are adjusted.
• the control signal CT is a bundle of a set of filter coefficients to be supplied to each filter circuit, and the delay time and the delay time are controlled by changing and controlling the filter coefficient values of those sets. The amplitude is adjusted.
• the plurality of unit drive signals generated by the directivity forming signal generation circuit 51 are supplied to the channel synthesis circuits 541, 542, 543,..., 54 ⁇ and the output amplifier 55.
• 1, 55 2, 55 3,..., 55 ⁇ (where ⁇ is the number of speaker units 33) are supplied to the corresponding speaker units 33 of the array speaker body 31.
• the array speaker audio signal generation circuit 50 for the array speaker, the beam sound wave radiated from the array speaker body 31 is reflected on the right wall surface 14R of the listener 12 and then the listener 1 A plurality of loudspeaker unit drive signals having directivity so that the loudspeaker unit 2 reaches and is heard are generated. Also, from the audio signal of the left channel, the array speaker audio signal generation circuit 50 reflects the beam-shaped sound wave radiated from the array speaker main body 31 onto the left wall surface 14 L of the listener 12, A plurality of speaker unit drive signals having directivity reaching the listener 12 and being listened to are generated.
• the beam sound wave radiated from the array speaker main body 31 directly reaches the listener 12 and is heard.
• a plurality of speaker unit drive signals having such directivity are generated.
• a plurality of speaker unit drive signals are generated so as to provide directivity such that the sound image based on the audio signal is at a desired localization position.
• the plurality of speaker unit drive signals as described above are supplied to the plurality of speaker units 33 of the array speaker body 31.
• the directivity beam as described above is output from the array speaker power body 31.
• a sound wave is emitted.
• the sound waves radiated from this arresting force 13 pass through the projection screen 20 and travel to the outside (that is, toward the direction where the listener is present).
• the center channel audio signal is radiated from the projection screen 20 to reach the listener 12, so that the listener 12 can reproduce the center channel audio without causing discomfort. You will be able to listen.
• the projection screen 20 slightly vibrates due to the sound wave radiated from the array speaker 13, but its displacement is very small, so that it hardly affects the image projected on the projection screen 20.
• the vibration of the projection screen 20 is restricted by the cushioning material 43 large enough to surround the periphery of the small speaker unit 33, so that the natural vibration of the projection screen 20 occurs in the low frequency range.
• the damping effect of the cushioning material 43 is sufficiently suppressed.
• the acoustic design may be performed assuming that the respective sound waves are radiated from the projection screen 20.
• the main body 31 is arranged on the rear side of the projection screen 20 so that the sound image based on the audio signal of the center channel is substantially at the center of the projection screen 20.
• an effect is obtained in which the image projected on the projection screen is hardly affected.
• the projection screen 20 is brought into contact or close contact with the end face 41 a of the cabinet 41 in which the speaker units 33 constituting the array speaker 30 are individually housed, through the cushioning material 43.
• the projection screen 20 is It is not always necessary to make contact with the sound wave emitting surface of one speaker 30. Sufficient characteristics can be obtained by arranging the sound wave emitting surface close to the sound wave emitting surface of the artificial speaker 30.
• the projection screen 20 is extended on the frame 32, and the array speaker main body 31 is arranged so that its sound wave emitting surface is close to the projection screen 20 with a small space therebetween. And fixed to the frame 32. In this case, the buffer material 43 need not be provided.
• FIG. 11 is a diagram for explaining the device configuration for this experiment. That is, as shown in FIG. 11, the microphone 61 is arranged at a position one meter away from the front surface (display surface of the projected image) of the projection screen 20. On the other hand, a speaker 62 is installed at a distance L from the back of the projection screen 20. Then, the sound wave radiated from the speech force 62 is picked up by the microphone 61, converted into an electric signal, that is, a sound signal, the sound signal is subjected to frequency analysis, and the frequency of the sound transmitted through the projection screen 20 is measured. Try to measure properties.
• Fig. 12 shows the frequency characteristics of the sound picked up by the microphone 61 without intervening the projection screen from the speech force 62 for comparison with the frequency characteristics of the sound picked up by the device of Fig. 11. It is shown.
• FIG. 13A shows a case where the distance between the speech force 62 and the projection screen 20 is 1 cm.
• FIG. 13B shows a case where the distance L between the speaker 62 and the projection screen 20 is 2 cm.
• FIG. 13C shows a case where the distance L between the speaker 62 and the projection screen 20 is 4 cm.
• Fig. 13D shows that the distance L between the speech force 62 and the projection screen 20 is 8 cm, and Fig. 13E shows that the distance L between the speaker 62 and the projection screen 20 is 16 cm. Is the case.
• the frequency characteristics are slightly degraded, but almost without the projection screen shown in Fig. 12. Similar to the frequency characteristics, but when the distance L is 8 cm or more, the effect of interference between the sound wave radiated from the speaker 62 and the reflected wave from the projection screen 20 is seen on the high frequency side. And the deterioration becomes large.
• the listener 12 can hear the playback sound almost the same as when the projection screen 20 does not exist, and even if there is a space between the projection screen 20 and the sound wave emitting surface of the array speaker body 31. It can be seen that good acoustic characteristics can be obtained by setting the distance L between the speaker and the projection screen 20 to 8 cm or less, preferably 4 cm or less.
• the projection screen 20 is extended with respect to the frame 32 so that the projection screen 20 is in contact with or closely contacting the radiating surface of the arc-spy force main body 31 housed in the frame 32.
• a sound-transmitting projection screen is attached to each of the unit cabinets 41 via a cushioning material or a cushioning material, and the speaker unit cabinet 41 attached with the projection screen is two-dimensionally attached. By arranging them in an array, an array speaker device with a projection screen may be formed.
• the array speaker audio signal generation circuit 50 shown in FIG. 10 may be installed in an empty space in the frame 32 together with the array speaker force main body 31.
• the projection screen may be extended to the frame 32 so as to cover the space including the installation space for the array speaker audio signal generation circuit 50, or the array speaker audio signal generation circuit 50 The portion of the signal generation circuit 50 may not be covered with the projection screen.
• each of the output amplifiers 55 1, 55 2, 55 3, 55 ⁇ of the array speaker audio signal generation circuit 50 is a speaker unit cabinet. 4 It may be provided within 1.
• the speaker units are arranged in a square lattice, but may be arranged in a staggered lattice, for example.
• the cabinet 41 is not a cube or a rectangular parallelepiped, but a hexagonal prism. They can also be arranged in a pattern.
• the adjacent speaker unit cabinets 41 are connected and arranged in close contact with each other, but the speaker unit cabinets 41 are arranged so as to be appropriately separated from each other. It may be.
• the speaker units are all arranged two-dimensionally. However, it is needless to say that the speaker units may be arranged one-dimensionally. It should be noted that the present invention is not limited to the above-described examples, and it is understood by those skilled in the art that various changes, substitutions, or equivalents can be made without departing from the scope of the appended claims and the gist thereof. it is obvious. INDUSTRIAL APPLICABILITY As described above, according to the present invention, for example, in the case of multi-channel surround playback, the sound signal of the center channel is placed at the center of the projection screen. The original multi-channel surround feeling can be obtained.
• the plurality of speaker units constituting the array speaker are housed in individual cabinets, respectively, and are in contact with or close to the projection screen. Therefore, even if the projection screen vibrates due to the sound wave radiated from the speaker unit, the vibration is slightly displaced by the sound wave of each speaker unit, and has little effect on the image viewing.

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• Health & Medical Sciences (AREA)
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• General Health & Medical Sciences (AREA)
• Multimedia (AREA)
• General Physics & Mathematics (AREA)
• Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
• Stereophonic System (AREA)
• Overhead Projectors And Projection Screens (AREA)
• Transforming Electric Information Into Light Information (AREA)
• Circuit For Audible Band Transducer (AREA)

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• 2002
  • 2002-12-10 JP JP2002357393A patent/JP3900278B2/ja not_active Expired - Fee Related
• 2003
  • 2003-10-31 EP EP03770100A patent/EP1571870A1/en not_active Withdrawn
  • 2003-10-31 US US10/532,396 patent/US20050271230A1/en not_active Abandoned
  • 2003-10-31 KR KR1020057007208A patent/KR20050084875A/ko not_active Ceased
  • 2003-10-31 CN CNA2003801050120A patent/CN1720760A/zh active Pending
  • 2003-10-31 WO PCT/JP2003/014018 patent/WO2004054314A1/ja not_active Ceased

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