Speaker system and a method for improving sound quality thereof

Abstract

A speaker system suppresses standing waves generated in the system and reproduces clear and dynamic bass sound. The system includes a cabinet formed of acoustic insulation walls, and at least one partition wall situated inside the cabinet to form a space by surrounding the space. The partition wall suppresses the standing waves generated inside the cabinet and is formed of a material having high internal loss. The space has a total capacity more than one tenth of a capacity of the cabinet, wherein a closed end of the partition wall is located between one-half and four-fifths of a distance from one end to the other end, and an opening area of the same partition wall is located at a side opposite to the closed end in a longitudinal direction of the cabinet. The opening area is located between four-fifths and five fifths of a distance from one end to the other end. The material has a density per volume greater than 0.1 g/cm 3 , a density per area from 0.01 g/cm 2 to 0.21 g/cm 2 and a characteristic of semi - transmission for the standing waves. The partition wall has a closed end portion. The closed end portion is formed of at least one of the partition wall and the acoustic isolation walls. The space is a substantially closed space.

1. A speaker system for a speaker comprising, ;
 a cabinet formed of an acoustic isolation wall walls, and having a maximum length L among width, depth and height of an inside of the cabinet, ; 
 a sound source to generate standing waves inside the cabinet, ; and 
 at least one partition wall situated inside the cabinet to form a space by surrounding the space, said partition wall suppressing the standing waves, a least a part of said partition wall being formed of a material which has high internal loss and a density per volume greater than 0.1 g/cm 3 , and a closed end portion surrounding the space, said closed end portion being formed of at least one of the partition wall and the acoustic isolation walls, walls; 
 wherein said material has a density per area from 0.01 g/cm 2  to 0.21 g/cm 2  and a characteristic of semi-transmission for at least two kinds of standing waves of wavelengths of the length L and twice of said length L among the standing waves, said space is a substantially closed space, and a surface of said partition wall directed toward the sound source is substantially flat and uninterrupt uninterrupted by any protrusion which reflects said two kinds of standing waves.  
 
     
     
       2. A speaker system according to  claim 1 , wherein said space has a total capacity more than one tenth of a capacity of the cabinet. 
     
     
       3. A speaker system according a  claim 1 , wherein said partition wall is made of a paper box. 
     
     
       4. A method of improving sound quality of a speaker system having a cabinet formed of an acoustic isolation wall walls, said cabinet having a maximum length L among width, depth and height of an inside of the cabinet, comprising forming at least one partition wall to form a space for suppressing standing waves generated inside the cabinet by a sound source and a closed end portion surrounding the space, at least a part of said partition wall being formed of a material which has high internal loss and a density per volume greater than 0.1 g/cm 3 , and said closed end portion being formed of at least one of the partition wall and the acoustic isolation wall walls wherein said material has a density per area from 0.01 g/cm 2  to 0.21 g/cm 2  and a characteristic of semi-transmission for at least two kinds of standing waves of wavelengths of the length L and twice of said length L among the standing waves, said space is a substatially substantially closed space, and a surface of said partition wall directed toward the sound source is substantially flat and uninterrupt uninterrupted by any protrusion which reflects said two kinds of standing waves. 
     
     
       5. A method ( of improving sound quality of a speaker system) according to  claim 4 , wherein said partition wall is made of a paper box. 
     
     
       6. A speaker system for a speaker comprising, :
 a cabinet ( 7 ) formed of acoustic isolation walls ( 2 ,  8 ,  5 ), and having a maximum length L among width, depth and height of an inside of the cabinet ( 7 ), ; and  
 at least one partition wall ( 9 ,  9 a,  9 b) situated inside the cabinet ( 7 ) to form a space by surrounding the space, said partition wall ( 9 ,  9 a,  9 b) suppressing standing waves produced inside the cabinet ( 7 ) by a sound source ; , said partition wall ( 9 ,  9 a,  9 b) being formed of a material having high internal loss; , said space having a total capacity more than one tenth of a capacity of the cabinet ( 7 ),  
 wherein a closed end ( 9 a) of the space is located between one-half and four-fifths of a distance from one end of the length L to the other end, an opening area (O) of the same space being located at a side opposite to the closed end ( 9 a) in a longitudinal direction of the cabin ( 7 ) having the length L; , said opening area (O) being located between four-fifths and five-fifths of a distance from one end of the length L to the other end; , the partition wall ( 9 ,  9 b) in the longitudinal direction continuing from the closed end ( 9 a) to the opening area (O); , a cross-sectional dimension of the space being shorter than a depth of the space; , and a surface of said partition wall directed toward the sound source is substantially flat and uninterrupt uninterrupted by any protrusion which reflects said standing waves.  
 
     
     
       7. A speaker system according to  claim 6 , wherein said partition wall is made of a paper box. 
     
     
       8. A method of suppressing standing waves generated inside a cabinet by a sound source, said cabinet being formed of an acoustic isolation wall walls, said cabinet comprising forming at least one partition wall to form a space and a closed end portion surrounding the space, at least a part of said partition wall being formed of a material which has high internal loss and a density per volume greater than 0.1 g/cm 3 , and said closed end portion being formed of at least one of the partition wall and the acoustic isolation wall walls, wherein said material has a density per area from 0.01 g/cm 2  to 0.21 g/cm 2  and a characteristic of semi-transmission for the standing waves, said space is a closed space, and a surface of said partition wall directed toward the sound source is substantially flat and uninterrupt uninterrupted by any protrusion which reflects said standing waves. 
     
     
       9. A method according to  claim 8 , wherein said partition wall is made of a paper box.