JPH0136398Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the structure of a speaker system that actively utilizes the plate vibration of a cabinet to obtain good reproduced sound.

The plate material that makes up the speaker system cabinet vibrates under the influence of internal standing wave sound pressure and the reaction force of the speaker unit, and radiates sound separately from the speaker unit. Generally, the sound caused by this plate vibration is transmitted to the speaker unit. The reverberant sound reaches 20 to 30 dB below the reproduced sound of the speaker unit, and the reverberant sound lasts for a longer time than the reproduced sound of the speaker unit.Moreover, the sustained reverberant sound is caused by a unique vibration mode determined by the dimensions and material of the cabinet board material. Because it has frequency characteristics, it is superimposed on the sound reproduced by the speaker unit, causing a deterioration in the sound quality of the speaker system. For this reason, conventionally the plate material is reinforced to suppress cabinet plate vibration, but this merely changes the vibration mode of the plate material, suppressing the plate vibration and reducing the effect of the plate vibration on the reproduced sound. It could not be completely removed. In order to eliminate these drawbacks of the conventional example, the present invention uses an exciter to change the characteristics of the plate vibration described above, and actively radiates sound to the outside, thereby making the sound reproduced by the speaker system even more effective. It gives a sense of relaxation.

In FIG. 1, reference numeral 1 denotes a cabinet, on which a wall plate is attached at least one or more speaker units 2a, 2b, which are connected to an input terminal 4 via a dividing circuit 3 for the speaker unit. It has the same configuration as the speaker system.

There are several (2 in the figure) on the wall of cabinet 1.
vibrator exciters 5a and 5b are attached, and each is connected to the input terminal 4 of the speaker system via frequency correction amplifiers 6a and 6b whose frequency characteristics can be adjusted individually.

In the figure, the vibrators 5a and 5b are attached to the full plate 1a and the side plate 1b, respectively.
Since the purpose is to generate plate vibration, the mounting location is not limited to this. Plate vibration varies depending on the shape and dimensions of the plate, so generally one exciter is installed on each wall, and the characteristics of each frequency correction amplifier are adjusted to match the vibration of each component of the cabinet. The best effect can be obtained if

Although the structure of the vibrator is not particularly limited, as shown in FIG.
The voice coil 22 of the electrodynamic electro-mechanical converter is held by a damper 23 and is mounted on a cabinet wall 24.
A simple and practical method is to attach the plate to the plate and cause the plate to vibrate due to the reaction with the magnetic circuit.

The characteristics and effects of the frequency correction amplifier connected to the vibration exciter are taken as one example among the plurality of vibration exciters, and the effect on plate vibration is shown in the third example for the buffer plate 1a.
To explain with a diagram, the acceleration characteristic of the plate vibration of the example cabinet has the frequency characteristic shown in 31, and the high-level vibration around 250 to 500 Hz and around 2.5 KHz gives the reproduced sound a unique characteristic. It was damaging the sound quality.

If the signal corrected by the output characteristic 33 of the frequency correction amplifier 6 is applied to the vibrator 5 and the cabinet is excited, the plate vibration acceleration level will be as shown in 32, the energy distribution will be uniform, and the reproduced sound will be The negative effects that give the sound its own unique characteristics are removed, and on the contrary, it has the effect of adding richness to the reproduced sound.

In another embodiment (not shown), if the signal applied to the vibrator is only a low frequency component, the cabinet radiation in the low frequency range is increased, which has the effect of increasing the bass sound in a small system.

For further simplification, the frequency correction amplifier may be omitted, or even if an attenuator is simply connected, this will have a considerable effect in increasing the richness of the reproduced sound.

As mentioned above, the speaker system of the present invention has a plurality of vibrators attached to the cabinet wall plate, and actively utilizes the plate vibration to enrich the reproduced sound and provide an excellent hearing sensation. .

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of the speaker system of the present invention, FIG. 2 is a sectional view of the vibrator, and FIG. 3 is a plate vibration acceleration frequency characteristic diagram. 1 is a cabinet, 5a, 5b... are exciters,
6a, 6b... are frequency correction amplifiers.

Claims (1)

[Scope of utility model registration request] A plurality of vibration exciters 5a, 5 are installed on the cabinet 1 wall plate.
A speaker system characterized in that b,... are attached.