Speaker system

[Detailed Description of the Invention]

Field of the Invention The present invention relates to the speaker system which has both directivity. PRIOR ART It is Becoming■ to show the movie which used the big screen by improvement in video imaging technique also at home in recent years possible. - Have come. In connection with this, a sound device is also attached to a big screen, and is by carrying out, and force and sound quality have come to be required. A sound device combined with home picture reproducer 13 as shown in Drawing 8 from such a background, It is what is called surround acoustic field playback equipment that used 2 or speaker system 11 beyond it ahead to televiewer 10 in 2~3 speaker systems 8, the side, or back in many cases. Signals with which the front channel of this surround acoustic field playback equipment is reproduced, such as a soft sound and background music, and a back channel deal with the signal concerning the indirect sound and sound which compounded the signal of the front channel using the special processing unit. Although the performance corresponding to the signal dealt with fundamentally is called for about the speaker system of each channel, If the tones of a part for direct Otonari which comes from the front, and the ingredient of the indirect sound and sound which come from back differ, in order to give a televiewer sense of incongruity, the speaker system of the front and back has an if possible desirable thing of the same form. A back channel reaches directly and installing a speaker system so that the sound from a speaker system may not carry out the acoustic image normal position to 3-televiewer on the relation treating indirect sound, There is the method of attaining decentralization of a sound source and achieving above-mentioned effect by being wished at the point which achieves good surround effect, for example, surrounding a televiewer, using speaker system 11 for back in large numbers, as shown in Drawing 8. however, one side -- from the problem of a setting position, or a point of expense -- if possible -- few -- it is required that an effect should be acquired by use of some speaker systems. The speaker system as shown in the sectional view of Drawing 9 as a speaker system for back from the above point is proposed. The speaker unit to which 1.2 has the same performance in Drawing 9, and 3 are cabinets, and speaker units 1 and 2 are electrically connected so that it may operate by a reverse phase mutually. Drawing 10 shows the sound pressure frequency characteristic in the front of speaker unit 1 of a speaker system, or speaker unit 2 shown with the sectional view of Drawing 9. The equivalent distance of the source of sound 4- of speaker units 1 and 2 in the speaker system shown with the sectional view of Drawing 9 Drawing 11, It is an example of polar-coordinates directional characteristics when the front side of Oo speaker unit 2 is 180 degrees the front side of speaker unit l in the zone more than the frequency used as half a wave, The front of speaker unit 1.2 shows both the directivity that serves as the sound pressure minimum from the sound pressure maximum and speaker unit 12 in an equidistant position, i.e., the side of a cabinet. Object of the Invention Although Drawing 12 is an example of arrangement of the sound device which combined with the home picture reproducer the speaker system shown in Drawing 9 as the speaker system for back, As shown in this figure, when a speaker system is installed, the directional characteristics of speaker system 12 for back, since it is both directivity as shown in Drawing 11, sound pressure serves as the minimum near a viewing-and-listening position, and the sound of speaker system 12 for back does not reach direct vision listener 10 -- few -- some -- the surround effect good to televiewer 10 with use can be given. However, the speaker system shown in Drawing 9, the -- the zone not more than frequency f0 where the equivalent distance between the sound sources of speaker unit 1*2 will be half a wave as shown inO [ 1 ] figure Since the sound pressure of speaker unit 1.2 denies mutually, there is and it produces the rapid fall of a sound pressure level, since large level adjusting is needed by the amplifier side which lowers the frequency which a cabinet is made on a large scale and distance between speaker units 1*2 is made greatly, and in which a denial begins to occur, or drives a speaker system if it is going to reproduce to low-pass -- a practical use upper flame -- a Listen problem is produced. the present invention takes an example by the above-mentioned problem -- few -- some, the surround effect good to a televiewer with use can be given, and it aims at providing the speaker system which moreover does not cause the rapid fall of a sound pressure level in low-pass. Means for solving problem To achieve the above objects, the present invention attaches the speaker unit which has the same performance to both Baffle boards which carry out for relativity to the 1 Baffle board of a cabinet, The above-mentioned inside of a cabinet is divided, and two cavities are provided, and let one side of the Cavite be an encapsulated type, It electrically connects so that the duct which has an opening to the Baffle board with which the speaker unit concerning the above-mentioned cavity was attached in another side may be provided, and it may be made to operate as a bus reflex type and both the speaker unit may become negative phase mutually. The present invention attaches the speaker unit which has the same performance to both Baffle boards which carry out for relativity to the 1 Baffle board of a cabinet, The above-mentioned inside of a cabinet is divided, and two cavities are provided, and let one side of the Cavite be an encapsulated type, Baffle which counters the Baffle board with which the speaker unit concerning the above-mentioned cavity was attached in another side -- it electrically connects so that the duct which has an opening temporarily may be provided, and it may be made to operate as a bus reflex type and both the speaker unit may become negative phase mutually. The present invention attaches the speaker unit which has the same performance to both Baffle boards which carry out for relativity to the 1 Baffle board of a cabinet, It is based on the composition electrically connected so that Cabinet and the inside of the above may be divided, might provide two cavities, one side of the Cavite might be used as an encapsulated type, and another side might be operated as a rear surface open type and both the speaker unit might operate by a reverse phase mutually. OPERATION the composition which the present invention described above -- few -- some -- the surround effect good to a televiewer with use can be given, and, moreover, the rapid level fall of sound pressure in low-pass is not caused. EXAMPLE Hereinafter, one example of the present invention is described while referring to drawings. In Drawing 1, speaker unit 1.2 which has the same performance is attached to Baffle board 5 which carries out for relativity to 1 Baffle board 4 of cabinet 3, respectively. Duct 7 is provided in Baffle board 4 so that as for cabinet 3 an internal cavity is divided, speaker unit 2 may operate as an encapsulated type and operation and speaker unit 1 may operate as a bus reflex type with diaphragm 6. Speaker units 1 and 2 are electrically connected so that it may operate by a reverse phase mutually. In the zone beyond frequency f0 where the equivalent distance between the sound sources of speaker units 1 and 2 will be half a wave in the above-mentioned composition, Since the sound emitted from speaker units 1 and 2 serves as the same amplitude reverse phase characteristic, it shows both the directivity that serves as the sound pressure minimum from the sound pressure maximum and speaker units 1 and 2 in an equidistant position, i.e., the side of Cabinet l-3, at the front of speaker units 1 and 2. Since speaker unit ■ is sealing operation and speaker unit 2 is bus reflex operation in low-pass on the other hand, In the front of speaker unit 1 when only speaker unit 1 is driven, it is Drawing 2 a1. At the front of speaker unit 2 when only speaker unit 2 is driven, it becomes the sound pressure frequency characteristic of the To draw. Therefore, although speaker units 1 and 2 are reverse phases, since amplitude levels differ, the denial of sound pressure is eased, and a rapid fall of a sound pressure level like the speaker system shown in the sectional view of Drawing 9 can be prevented. In the speaker system by this composition, Drawing 2 C is a sound pressure frequency characteristic in the speaker unit 1 front when speaker unit 1.2 is driven [ both ]. In Drawing 3, speaker units 1 and 2 which have the same performance are attached to Baffle board 5 which carries out for relativity to 1 Baffle board 4 of cabinet 3, respectively. As for cabinet 3, duct 7 is provided in Baffle board 5 so that an internal cavity is divided, speaker unit 2 may operate as an encapsulated type and operation and speaker unit 1 may operate as a bus reflex type with diaphragm 6. Speaker units 1 and 2 are electrically connected so that it may operate by a reverse phase mutually. In the zone beyond frequency f0 where the equivalent distance between the sound sources of speaker units 1 and 2 will be half a wave in the above-mentioned composition, Since the sound emitted from speaker unit 1.2 serves as the same amplitude reverse phase characteristic, it shows both the directivity that serves as the sound pressure minimum from the sound pressure maximum and speaker units 1 and 2 in an equidistant position, i.e., the side of cabinet 3, at the front of speaker units 1 and 2. Since speaker unit 2 is sealing operation and speaker unit 1 is bus reflex operation in low-pass on the other hand, In the front of speaker unit 1 when only speaker unit 1 is driven, it is Drawing 4 a1. At the front of speaker unit 2 when only speaker unit 2 is driven, it becomes the sound pressure frequency characteristic of the To draw. Therefore, since amplitude levels differ although it is a reverse phase, the denial of sound pressure is eased, and speaker units 1 and 2 can prevent a rapid fall of a sound pressure level like the speaker system shown in the sectional view of Drawing 9. In the speaker system by this composition, Drawing 4 C is a sound pressure frequency characteristic in the speaker unit 1 front when speaker units 1 and 2 are driven [ both ]. In Drawing 5, speaker unit 1.2 which has the same performance is attached to Baffle board 5 which carries out for relativity to 1 Baffle board 4 of cabinet 3, respectively. Cabinets 3 are Baffle board 4, Baffle board 5, inside partition 6, and side board 7b+. c The sealing portion which comprises d, Baffle board 5 and inside partition 6, side board 7a b It is part 11 to the rear surface opening portion which comprises d. - The rate is carried out. Speaker units 1 and 2 are electrically connected so that it may operate by a reverse phase mutually. Since the sound emitted from speaker unit 1.2 in the above-mentioned composition in the zone more than the frequency from which the equivalent distance between the sound sources of speaker units 1 and 2 will be half a wave serves as the amplitude reverse phase characteristic, The front of speaker units 1 and 2 shows both the directivity that serves as the sound pressure minimum from the sound pressure maximum and speaker unit 1*2 in an equidistant position, i.e., the side of cabinet 3. Speaker unit 1 is [ in / on the other hand / low-pass ] encapsulated type operation, Like [ the sound pressure frequency characteristic in the speaker unit 2 front when the sound pressure frequency characteristic in the speaker Unit 1 front since speaker unit 2 is operation of a rear surface open type, when only speaker unit 1 is driven drives only 6th / The / figure 81 speaker unit 2 / of 6th / The / figure To ], A different low-pass reproduction limit is shown. Therefore, speaker system 12 which the denial of sound pressure was eased since amplitude levels differed although speaker units 1 and 2 are reverse phases, and was shown in the sectional view of Drawing 9 - of -- the rapid fall [ like ] of a sound pressure level can be prevented. In the speaker system by this composition, Drawing 6 C is a sound pressure frequency characteristic in the speaker unit 1 front when speaker units 1 and 2 are driven [ both ]. Although speaker units 1 and 2 which have the same performance are used in the example, it cannot be overemphasized that the composition which uses the multiway loudspeaker system which comprised a speaker unit which has the same performance, respectively, and a Dividing network is also effective. Drawing 7 is an arrangement plan of the sound W device which combined the speaker system in the present invention with home picture reproducer 13 as the speaker system for back, the speaker system called using speaker system 9 for back at a time for one right and left -- small -- the good surround effect can be given to televiewer 10, using it some. Details of an invention according to [ as explained ] the present invention -- few -- some -- the surround effect good to a televiewer with use can be given, and the speaker system which moreover does not cause the rapid fall of a sound pressure level in low-pass can be realized.

[Brief Description of the Drawings]

In Drawing 7 of A Bi in the 1st example of the present invention, Drawing 1 is an arrangement plan of the sound device combined with the home picture reproducer by using the speaker system of the present invention as the speaker system for back, The arrangement plan of the sound device which combined the speaker system of the former [ Drawing / 8 ] with the home picture reproducer as the speaker system for back, 14 - ■ 2 ... speaker unit, 3 ... a cabinet and 4.5 ... Baffle board, 6 ... inside diaphragm, 7 ... duct, 8 ... speaker system for the front, 9 ... speaker system for back, 1 o ... a televiewer and 1471 [ I4 ... An input terminal, 15 ... Internal wiring material. ] ... The speaker system for back, 12 ... The speaker system for back, 13 ... Visual equipment