JPS5825796A - Variable directional speaker system - Google Patents

Abstract

PURPOSE:To vary the directivity, by reproducing the reproducing frequency band by private speakers divided into two or more and providing wide directional and narrow directional speakers for the middle or more band and operating one or both of them to adjust the level. CONSTITUTION:The output of an amplifier 12 drives a wide directional tweeter 9 through an HPF 16 and drives a wide directional squawker 8 through a BPF 15b and a control part 18 and drives a narrow directional squawker 7 through the control part 18 and drives a woofer 6 through an LPF 14. The control part 18 switches and uses one or both of squawkers 7 and 8 and adjusts 25, 26 levels of squawkers 7 and 8 independently. They are stored in an enclosure so that the woofer 6 radiates sounds the floor while keeping prescribed dimensions from the floor and the squawker 7 radiates sounds in the single direction horizontally and the squawker 8 and the tweeter 9 radiate sounds in all directions horizontally. Thus, the sound volume and the directivity are controlled freely to obtain a desired acoustic effect.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker system with variable directivity, and in particular a control unit that combines speakers with different directivity for reproduction of frequencies above the midrange and controls the level of input applied to each. consists of an adjusting means and a switching means,
It is an object of the present invention to provide a variable directivity speaker system whose directivity can be varied continuously or instantaneously.

In general, the directivity of a speaker is determined automatically when the system is completed, and in the low range it is close to omnidirectional.
The effect of the baffle surface of the enclosure increases as the frequency range increases, and in the high frequency range it becomes equivalent to an infinite baffle.
It becomes π space radiation.

If the directivity of the speaker is fixed in this way, the timbre will vary depending on the listening conditions, such as the shape and size of the room, differences in reverberation time, listening position, etc. Performance cannot be fully demonstrated. Furthermore, problems in compatibility between music and speakers occur because the directivity of the speakers is fixed.

Hitherto, speaker systems with variable directivity have been devised to solve the above problems, but no specific technology has been disclosed, and the system has problems of limited practicality.

The present invention provides a variable directivity speaker system that solves the above problems, and one embodiment thereof will be described below with reference to the drawings. Figures 1 (5), (B), and (Q are side, front, and bottom views of an embodiment of the variable directional speaker system of the present invention C, respectively, and Figure 2 is a polar pattern of the narrow directional speaker. FIG. 3 shows a polar pattern of a wide directional speaker.

The variable directional speaker system 1 has a reproduction frequency band of 3
It is a divided three-way speaker system, and roughly consists of a rectangular parallelepiped enclosure body 2, a rectangular parallelepiped single enclosure 3 whose bottom area is smaller than the enclosure main body 2, and a rectangular parallelepiped single enclosure 4 whose bottom area is smaller than the single enclosure 3. , enclosure body 2
A single enclosure 3 is installed near the center of the top, and a single enclosure 4 is further stacked on top of the single enclosure 3, and the single enclosure 3.4 is covered with a cover 5.

The enclosure body 2 has legs 2b at the four corners of its bottom surface 2a.
A predetermined gap is provided between the bottom surface 2a and the floor or the like. Also, inside the enclosure body 2, there are speakers woo/1-6 (e.g. cone type speakers) dedicated to low frequency reproduction.
is attached toward the lower side of the bottom surface 2a, and furthermore, a narrow directional squawker 7 is attached toward the front side. The narrow directional squawker 7 is a speaker dedicated to mid-range reproduction, for example, a horn type speaker, and as shown in FIG. 2, its directivity begins to increase at a frequency around 500 Hz.

The single enclosure 3 is an omnidirectional speaker unit in which wide directional squawkers 8, which are speakers exclusively for mid-edge reproduction, are arranged on all sides of the enclosure.

Similarly, the single enclosure 4 is an omnidirectional speaker unit in which wide directional tweeters 9, which are speakers dedicated to high frequency reproduction, are arranged on all sides of the single enclosure 4. The wide directional squawker 8 and the wide directional tweeter 9 are, for example, dome-shaped speakers, as shown in FIG.
Z ~ 8 kl (has a characteristic of wide directivity in z).

Next, we will discuss the circuit of the variable directional speaker system 1 in the fourth section.
This will be explained with figures. FIG. 4 shows a block diagram of one channel of an embodiment of the variable directional speaker system according to the present invention.

The circuit 11 of the variable directional speaker system 1 includes an amplifier 12 on the input side. ! :, output side speaker section 13, low-pass filter 14 for low range, band-pass filter 15 for mid-range
a, 15b, a network 17 having an Il bypass filter 16G, and a control section 18 which is a main part of the present invention. The speaker section 13 includes a woofer 6
, a narrow directivity squawker 7, a wide directivity squawker 8, and a wide directivity tweeter 91.The output of the amplifier 12 passes through filters 14, 15a, 15b, and 16 to reproduce each frequency band.

A mid-range filter 15a in the network 17.

15b is a narrow directional squawker 7 and a wide directional squawker 8
A total of two circuits, one circuit for each network, each having the same number of circuit identifications, are provided for exclusive use, and each circuit is connected to the control section 1B.

The control unit 18 consists of a switching mechanism 19 that instantly changes the directivity of the midrange and an adjustment mechanism 20 that continuously changes the directivity. be controlled. The switching mechanism 19 includes a switch 22 that opens and closes between the wide directional squawker 8 and the filter 15b, a switch 23 that opens and closes between the narrow directional squawker 7 and the filter 15a, and the filter 15a.

It consists of a switch 24 that opens and closes a circuit that simultaneously sends the frequency that has passed through the squawker 15b to each squawker 7.8, and the respective switches 22, 23, and 24 are interlocked. That is, when switch 22 is ON, switches 23 and 24' are OFF.
It becomes FF, and only the wide directional SC' force 8 operates. When switch 23 is ON, switches 22 and 24 are OFF.
I', and only the narrow directional squawker 7 operates. Furthermore, when switch 24 is ON, switches 22 and 23 are OFF.
F, and each squawker 7.8 operates simultaneously. The adjustment mechanism 20 includes an attenuator 25 connected between the switch 22 and the wide directional squawker 87, and an attenuator 26 connected between the switch 23 and the narrow directional squawker 7.
- to adjust the level of the midrange signal sent to each squawker 7.8.

Next, a case will be described in which the variable directional speaker system 1 is operated to enjoy music. Figure 5 shows the directivity polar pattern of a single enclosure using the 4a wide directivity tweeter, and Figure 6 shows when the sound pressure level ratio between the wide directivity squawker and the narrow directivity squawker is changed. FIG. 7 shows the @wave l# characteristic at a measuring distance of 2 m on the axis in an anechoic configuration of the variable directional speaker system.

When the speaker system 1 is operated, the low frequency range is reorganized by the woofer 6, and the sound is reflected from the floor etc. and radiated to the surroundings.

The high violet is also reproduced by the tweeter 9 and radiated to the surroundings.

Its directivity is omnidirectional as shown in FIG. The midrange squawker 7.8 is connected to the switches 22 and 2 of the switching mechanism 19.
According to 3.24, either one or both of them can be operated simultaneously. The directionality of the midrange is set by the control section 18. 1 aircraft 4111
9 and the regulator tfII 20. For example, when placing emphasis on a spatial impression, etc., turn on the switch 22 and use the attenuator 25 to continuously change the sound pressure level in order to generate sound with the squawker 8, and when placing emphasis on a sense of force, In order for the squawker 7 to generate sound, the switch 23 is turned on and the attenuator 26 changes the sound pressure level continuously. Furthermore, we aim to balance the impression of sparseness with the sense of force, and adjust not only the increase or decrease of the sound but also the size of the sound image, the sense of spaciousness, the sense of perspective, etc. to match the original characteristics of the music or to suit the music's taste. When listening to the sound, turn on the switch 24 and turn on the attenuator 25 to make the squawker 7.8 sound.
The sound pressure level ratio is continuously changed from 2 to 6 degrees.

By this operation, state 81 showing narrow directivity (the state where the sound pressure level of the squawker 8 is slightly reduced and the sound pressure level of the squawker 7 is increased) and state B showing wide directivity (the state where the sound pressure level of the squawker 7 is increased) are obtained as shown in FIG. (a state in which the sound pressure level is set to 50° and the sound pressure level of the squawker 8 is increased) is arbitrarily selected according to preference. As shown in Fig. 247, the frequency characteristics when the speaker system 1 produces sound are as follows: the on-axis characteristic when the narrow directivity is expressed by IfM0, and the on-axis characteristic when the wide directivity is expressed as Qd.
I) and are almost in agreement with each other.

Switch 22.2 of the disconnection mechanism 19 of the control unit 18
3.24, it is possible to instantly change the directivity from narrow directivity to wide directivity, so it is easy to combine preferences for each music genre, and the narrow directivity squawker 7, The sound pressure level ratio can be varied by selecting either the wide directional squawker 8 or simultaneous sound generation.

Therefore, by selecting an appropriate value for directivity depending on the genre of music, you can produce acoustic effects that cannot be obtained with speakers with fixed directivity, and demonstrate the original performance of an excellent speaker system. By expanding the listening area, the listening area is apparently enlarged, and even if the listener moves a little, the movement of the sound image will not be as noticeable as in the conventional case. Furthermore, by freely moving the control unit 18 independently to the listening position, the listener can freely adjust the directivity from wide directivity to narrow directivity at the listening position and enjoy the music while checking the effect. I can do it.

In the above embodiment, only the mid-range has variable directivity t*4
However, the present invention is not limited to this, and the treble band may also have variable directivity. There are also four squawkers 8 and tweeters in a single enclosure 3°4. Each squawker 8 and each tweeter 9 may be provided with a switch so that the listener can selectively change the number of sounds produced by the squawker 8 or tweeter 9 depending on the genre of music or preference.

In addition, the circuit of the network in the mid-edge frequency band does not need to be provided with one circuit each with the same identification number as in the above embodiment, but can be shared and only the 1' circuit is used, or it can be configured with two or more circuits depending on the division. You may do so.

As mentioned above, the variable directional speaker system of the present invention is designed to vary the directivity of a speaker that can reproduce frequencies above the mid-range (range). A control section is provided which consists of an adjustment means for adjusting the level of the input applied to each speaker, and a switching means for making both or one of the above speakers produce sound, and the control section can be connected to the enclosure main body. Because of the configuration, it is possible to select the speaker that produces the sound while continuously changing the input level at will, so the size of the sound, the sense of spaciousness, and even the sense of perspective can be adjusted to suit the listener's preference. It is possible to easily select the directivity suitable for the genre of music, and furthermore, it is possible to freely change the directivity while checking the sound effect at the listening position. It has features such as:

[Brief explanation of the drawing]

Figure 1 (C1 is a side view, front view, and bottom view of an embodiment of the variable directional speaker system according to the present invention, respectively, and Figures 2 and 3 are the variable directional speaker according to the present invention) A polar pattern diagram of a narrow directional speaker and a polar pattern diagram of a wide directional speaker applied to an embodiment of the system, FIG. 4 shows an embodiment of the electric circuit system of the variable directional speaker system according to the present invention. The block diagram in Figure 5 is as shown in Figure 1 (2), CB), (('3
Figure 6 is a polar pattern diagram of the main body enclosure in which a wide directional tweeter is installed.
Figure 7 is a state diagram when changing the sound pressure level ratio between wide directional squawker and narrow directional squawker in Figure 1 (5), (
(g), (0) is a diagram showing the frequency characteristics at a measurement distance of 2 m on the axis in the anechoic chamber. l... variable directional speaker system, 2... enclosure body, 3. ．． 4...Single enclosure, 6
-- Woofer, 7... Narrow directivity squawker, 8... Wide directivity squawker, 9... Wide directivity tweeter, 17...
e-network, 18...control section, 19...
・Switching mechanism, 20...Adjustment mechanism, 22゜23.24・
...Switch, 25, 26...Fist attenuator. (C) Diagram [F]) 1b 2b

Claims (1)

[Claims] In a speaker system in which the reproduction frequency band is divided into two or more and each is reproduced by a dedicated speaker, a wide directional speaker and a narrow directional speaker are provided for reproduction of the frequency band above the middle range, and the wide directional speaker is - A control comprising an adjustment means for adjusting the level of input applied to the narrow directional speaker, and a switching means for switching the wide directional speaker and the narrow directional speaker to operate simultaneously or one of them. What is claimed is: 1. A variable directivity speaker system comprising: a control section, and the overall directivity can be varied by operating at least one of the adjusting means and the core switching means of the control section.