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(¥ 2,000) 20 Inventor 3, Patent applicant address Osaka Prefecture Kadoma city Oda Kamon 100
address Address Tokyo Nakano-ku Kiryu-cho 5-chome 6th 23 specification ■ Japan Patent
Office 0 JPA 50-671290 Published Japan 50. (1975) 6.5 Japanese Patent Application No. 4H3311, lA It is said that the directivity should be broadened in St. No. 11-/) St 55 inside the
agency. Shika 1 Name of invention
Direct sound, indirect sound ratio variable type speaker system
3. Detailed Description of the Invention The present invention relates to a direct sound, indirect
sound ratio variable type speaker system. Conventionally, with regard to the directivity of a
speaker, a sound pressure value prop at a specific frequency or angle is used, and from the
viewpoint of service area, in general, the meaning of directivity is spatial when listening points
are determined. It is not something but it is thought as follows. That is, the power radiated on the
central axis to the listener from the speaker acts as a direct sound, and the power radiated other
than on the central axis is reflected once by the peripheral wall, floor, ceiling, etc. of the room,
Because it acts as an indirect to reach the listener, the magnitude of the directivity must be
understood as the energy ratio of the direct sound to the indirect sound at the listening point.
Therefore, simply making the speaker system wide-directional does not necessarily give the best
sound reproduction, but it depends on conditions such as the size and shape of the room to be
listened to, the degree of reflection of the wall, the arrangement of the speakers, etc. It is
necessary to control the indirect sound and the direct sound ratio. In particular, when the
reflection from a mural or floor surface is too large EndPage: 1, making the directivity wide
destroys the sense of stereotaxy necessary at the time of stereo reproduction, and if making it
narrow directivity, the above-mentioned drawbacks are eliminated It is easy to cause hall effect
etc. Therefore, without changing the directivity characteristics and controlling the direct sound
and indirect sound ratio, the best acoustic □ reproduction can not be performed under any
conditions. The present invention is intended to solve the above problems, and provides a
speaker system capable of achieving optimum sound reproduction by changing the energy ratio
of direct sound and indirect sound. An embodiment of the present invention will be described
below with reference to the drawings. This device is a speaker system including a narrow
directivity pattern 1 as shown in FIG. 1) and a non-directivity pattern 2 as shown in FIG. 1 (B). As
shown in FIG. 2, each of the narrow directional speaker 3 and the wide directional speaker 4 is
provided with level adjusters 5 and 6 for adjusting human power, and by adjusting these, direct
sound and indirect sound can be obtained. It is a speaker system which made it possible to
change energy ratio. In the embodiment of FIG. 2, the operation of the direct sound / indirect
sound energy ratio variable type loudspeaker of the present invention will be described. In the
case 7 shown in FIG. 3 (A), only the narrow directivity Spinica is driven with the resistance R1-0
of the level adjuster 5 and the resistance R of the level adjuster 6, 2 = 6-0 shown in FIG.
Directivity pattern, which emits a large amount of direct sound to the listener. Further, 8 shown
in FIG. 3 (B) is directivity pattern 1 (4) when only the wide directivity speaker is driven, with
resistances R1 =: s <and R2 = O of the level adjuster of FIG. In i, '1', by emitting sound waves
backward and laterally, it is decided to emit more indirect sound to the listener.
In the case of 9 and 10 shown in FIG. 3 (e), when the polarity of the speaker is in phase at a
certain ratio such as RI = α, R2-s, any ratio of direct sound to indirect sound is set. It shows what
can be done. Special sound field reproduction is also possible by changing the phase of the
human power symbol of the speaker. In this way, by combining the directivity of the narrow
directivity speaker and the wide directivity speaker, a speaker system having various directivity
patterns can be configured. In addition to the above effects, the present invention is capable of
optimum reproduction adapting to various conditions of re-live-field such as hall effect as
psychological effects, and also according to the type of sound source and the taste of the listener
/ person. It has an effect that it is possible to emphasize the sense of perspective and wideness.
4. Brief description of the drawings "Fig. 1 (A) is a pattern diagram of a narrow directional
speaker, Fig. 1 (B) is a diagram of a wide directional speaker pattern, and Fig. 2 is an embodiment
of the present invention 3 (A) shows the directivity pattern when only the narrow directivity
speaker is driven, and FIG. 3 (B) shows the directivity pattern when only the wide directivity
speaker is driven. FIG. 3 (C) is a diagram showing directivity patterns and turns when the two
speakers are driven at a constant rate of Vi. 1 ··· Narrow directivity pattern 2 ··· Wide directivity
pattern 3 ····· Narrow directivity speaker 4 ··· Wide directivity speaker-EndPage: 25.6 · · · · · · · · · · · ·
Wide-directional hatan. 9.10 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · resistance. Patent applicant Matsushita Electric Industrial Co., Ltd. Fig.1 Fig.2 5, List of
attached documents 3, Inventors other than the above, Patent applicant or agent (1) Inventor's
address same place (2) Agent's address Tokyo Nakano Ward Gamo-cho 5-chome 6-23rd
EndPage: 3