JPS6025194Y2 - Acoustic Feedback System - Google Patents

Description

[Detailed Description of the Invention] This invention relates to improvements in acoustic feedback systems.

As is well known, speaker devices that use a motional feedback system to improve the low-frequency characteristics of a speaker have been known.

Recently, speaker devices using acoustic feedback systems have been actively developed as an application of this motional feedback system.

Figure 1 shows the basic configuration of the acoustic feedback system as described above.
The electrical signal supplied to is amplified by an amplifier 12 and reproduced by a speaker 13.

Here, a part of the reproduced sound from the speaker 13 is converted back into an electrical signal by the acoustic feedback converter 14 and fed back to the input terminal of the amplifier 12.

The acoustic feedback system described above can reduce distortion like a general feedback system, and since the feedback signal is captured as a sound wave and fed back to the amplifier 12, the speaker 1
It has various special advantages, such as being able to reduce the distortion of the cone of No. 3.

Incidentally, in the acoustic feedback system as described above, it is desirable to install the acoustoelectric transducer 14 approximately at the center of the front surface of the speaker 13 in order to maximize the above-mentioned advantages.

However, when the above-mentioned acoustic feed balance system is applied to actual audio equipment, such as a speaker box, there are many structural difficulties in installing the acoustoelectric transducer 14 approximately in the center of the front of the speaker 13. Further, there is a problem in that the wiring for forming the feedback loop connecting the acoustoelectric transducer 14 and the amplifier 12 is exposed to the outside, spoiling the appearance.

This invention was made in consideration of the above-mentioned circumstances, and aims to provide an extremely good acoustic feedback system that has a simple structure, is easy to manufacture, and does not impair its aesthetic appearance.

Hereinafter, an embodiment in which this invention is applied to a speaker box will be described in detail with reference to the drawings.

In FIG. 2, reference numeral 21 denotes a speaker box formed into a substantially box shape as a speaker storage case, and speakers 23 and 24 are respectively attached to a baffle 22 provided on the front side of the box as shown in the figure. Openings 221 and 222 are formed for releasing the reproduced sound from 24 to the outside.

Furthermore, jacks 25 and 26 are provided at the upper and lower parts of the baffle 22 in the figure, and together with plugs 34 and 35, which will be described later, constitute connecting portions A and B.

One end of a lead wire 27 is connected to the jack 25, and the other end of the lead wire 27 is connected to the speaker 23.2.
It is connected to the input terminal of an amplifier (not shown) for driving 4.

On the other hand, 31 in FIG. 2 is a frame body, and a net 32 as a net-like member is pasted to an opening 331 of the frame body.
An acoustoelectric transducer 33 is attached at a position corresponding to approximately the center of the front surface of the speaker 24.

Additionally, jacks 25 and 26 provided on the baffle 22 of the speaker box 21 and plugs 34 and 35 that are detachable protrude from the upper and lower parts of the frame 31 in the figure.

The plug 34 of the plugs 34 and 35 and the acoustoelectric transducer 33 are connected by a lead wire 36 wired along the net 32.

Here, in the state shown in Figure 2, the plug 34.
35 and jacks 25 and 26 are connected as shown by dotted line arrows in the figure.

Then, the front surfaces of the speakers 23 and 24 are covered with the net 32, and the acoustoelectric transducer 33 is installed approximately at the center of the front surface of the speaker 24.

In addition, the connection part A consisting of the jack 25 and the plug 34 serves as both a mechanical connection and an electrical connection, and the output electrical signal from the acoustoelectric transducer 33 is connected to the lead wire 36 and the connection part A.
and is supplied to the input end of the amplifier via a lead wire 27.

Note that the connecting portion B consisting of the jack 26 and the plug 35 is for mechanical connection only.

Therefore, according to the configuration of the above embodiment, the acoustoelectric transducer 33 is attached to the net 32 and the lead wire 36 is wired along the net 32, so that the configuration is reasonably simple. At the same time, the lead wire 36 is not exposed to the outside and the appearance is not spoiled.

Furthermore, by simply connecting the plug 34.35 to the jack 25.26, the acoustoelectric transducer 33 can be located approximately at the center of the front surface of the speaker 24, and a feedback loop between the acoustoelectric transducer 33 and the amplifier can be configured. It is also extremely easy to manufacture because the connections for the purpose can be made at the same time.

Note that this invention is not limited to the above embodiments.

For example, as a jack, a recess is formed in conductive rubber, etc.
A plug may be inserted into the recess.

In addition, this invention can be modified and implemented in various ways without departing from its gist.

Therefore, as described in detail above, according to this invention, it is possible to provide an extremely good acoustic feedback system that has a simple structure, is easy to manufacture, and does not impair its aesthetic appearance.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of an acoustic feedback system, and FIG. 2 is a side sectional view showing an embodiment of the acoustic feedback system according to this invention. 21...Speaker box, 22...
Baffle, 23, 24...Speaker, 25, 2
6...Jack, 27...Lead wire,
31... Frame body, 32... Net, 33
...Acoustic electric transducer, 34, 35...
Plug, 37...Publication wire, A, B...Track connection part.

Claims (1)

[Scope of utility model registration request] An amplifier, a speaker driven by the output of the amplifier, a speaker housing housing housing the speaker therein and having an opening for emitting sound reproduced from the speaker to the outside; In a speaker device comprising a net-like member that covers an opening and has a connecting portion that is detachably connected to the speaker storage casing, an acoustic device that is attached to the mesh-like member and converts sound reproduced from the speaker into an electrical signal. 1. An acoustic feedback system comprising: an electrical transducer; and a feedback circuit that returns an output electrical signal from the acoustoelectric transducer to the input end of the amplifier via the connecting portion of the mesh member.