JP2548705Y2 - Speaker device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker system used for a sound reproducing apparatus, and more particularly to a speaker connecting apparatus for connecting an amplifier and a speaker system.

[0002]

2. Description of the Related Art Hitherto, in a sound reproducing apparatus intended for high-fidelity reproduction, a multi-way loudspeaker system comprising a plurality of loudspeaker units and having a wide reproduction sound range has been generally used. FIG. 2 is a block diagram showing a conventional reproducing apparatus including a speaker system. In each of the parts shown by broken lines, 10 is an amplifier, 20 is a multi-way speaker system, and 30 is a connection cable for connecting the amplifier 10 and the speaker system 20. It is.

The loudspeaker system 20 includes a bass speaker unit LF and a treble speaker unit HF. The bass speaker unit LF is connected via a dividing network LS, CP to supply a bass sound signal. The treble speaker unit is connected via a treble dividing network CS, LP so that a treble sound signal is supplied.

A speaker cable 30 connected between the output terminals 12 and 14 of the amplifier 10 and the input terminals 22 and 24 of the speaker system is a conductive wire whose impedance value per unit length is sufficiently lower than the impedance of the speaker system. And the amplifier 10 and the speaker system 2
Wiring is performed so that the connection distance between 0 is not too long.

[0005]

However, contrary to the above, when the speaker cable 30 is connected, a thin cable is used, or the space between the amplifier 10 and the speaker system is changed depending on the installation location of the apparatus. In some cases, the distance may be too long, and the principles of connecting speakers may not be observed.

FIG. 2 shows the current flowing through the speaker cable when the reproducing apparatus is operated with the speaker connection deviating from the principle. Now
It is assumed that the resistance Rf exists in the conductor of the cable 30 connected between the terminals 12 and 22, and the resistance Rb also exists in the conductor of the cable 30 connected between the terminals 14 and 24. Thus, the speaker system 2 is output from the amplifier 10 output.
0 is supplied to the terminal 12 of the cable 30.
, A signal current i flows in the 22 direction, and a current i flows in the opposite direction from the terminal 24 in the 14 direction. When a current i flows through the resistors Rf and Rb of the speaker cable 30, which is common to the two speaker units LF and HF, a back electromotive force is generated there and is superimposed on the original signal current. The high frequency component of the unnecessary signal generated by the back electromotive force is directly introduced into the circuit of the treble unit HF through the terminal 24, and the sound signal in which the unnecessary component is superimposed on the original reproduced sound is reproduced by the speaker HF. That is, there is a problem in that the sound in the high-frequency portion reproduced from the speaker unit HF is affected by the back electromotive force and is turbid.

The present invention has been made in view of the above circumstances.
It is an object of the present invention to provide a speaker connection device capable of obtaining a transparent reproduced sound without being affected by the impedance of a connection cable.

[0008]

In order to achieve the above object, in the speaker device of the present invention, an amplifier output audio signal is divided into a plurality of signal bands by an unbalanced dividing network and supplied to a plurality of speaker units. In a speaker system for reproduction, a positive signal supply terminal connected to supply a sound signal to the plurality of speaker units through the dividing network, and a negative signal is supplied to each of the plurality of speaker units. A plurality of connected negative signal supply terminals are provided, each between the positive signal terminal and the audio signal output terminal of the amplifier, and between the plurality of negative signal supply terminals and the ground terminal of the amplifier. The speaker cable is connected.

[0009]

When a cable connected between the speaker system and the amplifier has an inherent resistance, a back electromotive force is generated in the cable by a signal current flowing through the cable. This back electromotive force goes around to the loudspeaker unit circuit side,
The quality of the reproduced high frequency audio signal is impaired. In the present invention, a separate signal supply terminal provided in the speaker system and a separate signal connection terminal between the speaker system and the signal output terminal of the amplifier are provided so that signals are separately supplied to the plurality of speaker units. The low impedance negative side circuit connected to the plurality of speaker units is separated by the speaker cable, so that even if a back electromotive force is generated in the cable by the current flowing through the cable, the back electromotive force is generated in the high frequency speaker unit. Power is prevented from sneaking around, and there is no characteristic deterioration of high-frequency sound reproduced from the high-frequency speaker.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention.
The same components as those described above are denoted by the same reference numerals, and description thereof will be omitted. In the figure, 10 is an amplifier, 20A is a speaker system, 40 is an amplifier 10 and a speaker system 20A.
Is a connection cable. Speaker system 20
A is provided with three audio signal input terminals 25, 26, and 27, and a speaker cable 40 is connected to these input terminals.
Is connected. The terminal 25 is supplied with a positive signal voltage (+) of the amplifier output 12, and the terminals 26 and 27 are supplied with a negative signal voltage (−). Terminal 2
The circuit 5 is divided into two circuits inside the speaker system 20A, one of which is connected to the bass unit LF via the unbalanced dividing network LS, and the other is for the treble via the unbalanced network CS. It is connected to the unit HF. The negative electrode of the bass unit LF is connected to the terminal 26, and the negative electrode of the treble unit HF is connected to the terminal 27.

The input terminals 25, 2 of the above speaker system
The cable 40 connected between the output terminals 12 and 14 of the amplifier 10 includes three conductors 40a and 40b,
40c, one side of the cable is connected to terminals 25, 26, and 27 of the speaker system, respectively, and on the other side of the cable connected to the amplifier, the conductor 40a is connected to the terminal 12, and the conductors 40b and 40c are connected to ground terminals. 14 in common.

Next, the operation of the invention will be described. Amplifier 10
Is supplied to the speaker system 20A through the cable 40 connected to the terminals 12 and 14. A plurality of conductors 40a, 40b, 40 constituting the cable 40
c has resistances R1, R2, and R3, respectively. When an audio signal is supplied from the amplifier 10 to the speaker system 20A, a current i1 flows through the conductor 40a.
The current i1 is split in two directions from the terminal 25 and flows into the unbalanced dividing filters LS and CS. At this time, since the resistance R1 of the conductive wire 40a is much smaller than the impedance of the dividing filters LS and CS, no back electromotive force is generated in the resistor R1 even when the current i1 flows.

On the other hand, the input terminal 26 of the speaker system is directly connected to the voice coil of the bass unit LF inside the system, and the impedance at the terminal 26 has a low value. The input terminal 27 is also connected to the voice coil of the treble unit HF, and its impedance is similarly low. Therefore, the conductors 40 b connected between these terminals 26 and 27 and the ground terminal 14 of the amplifier 10,
The resistances R2 and R3 of 40c are not negligible values, and the current i2 flowing from the terminal 26 to the ground terminal 14 of the amplifier is affected by the resistance R2. However, the terminal 26 is isolated from the circuit of the treble unit HF, and the resistor R2
The back electromotive force does not flow to the circuit on the treble unit HF side.

Similarly, the terminal 27 is connected to the bass unit L
Since it is isolated from the circuit of F, the back electromotive force generated in the resistance R3 of the conducting wire 40c does not go around to the low sound unit LF. Therefore, even if the cable connecting the speaker system becomes somewhat longer, the back electromotive force generated in the connection cable does not affect the circuit on the unit facing the speaker system. In particular, the treble unit HF is affected by the back electromotive force, and the high frequency portion of the reproduced signal is easily damaged. Can be minimized, and a transparent high-frequency portion can be reproduced.

[0015]

As described above, according to the loudspeaker device of the present invention, a signal supply terminal for supplying a signal to each of a plurality of speaker units is provided, and each signal supply terminal is provided between the signal supply terminal and the amplifier. Since the speaker cables were separately connected, the circuits of the multiple speaker units were isolated from each other,
As a result, mutual interference between the speaker unit circuits has been eliminated.

Therefore, there is a resistance component inherent in the speaker cable used. In particular, when a high-power reproduction signal is supplied to the speaker system, a back electromotive force is generated in the cable by the current flowing through the cable. Since the low impedance circuit sides of the speaker unit are isolated from each other, the back electromotive force does not flow to other speaker unit circuits. Therefore, in the treble speaker unit, it is possible to reproduce a transparent sound without deterioration of characteristics in a treble region due to the back electromotive force.

[Brief description of the drawings]

FIG. 1 is a block diagram of a reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Amplifier 20, 20A Speaker system 25 Positive signal input terminal 26, 27 Negative signal input terminal 30, 40 Speaker cable LF Low frequency speaker unit HF High frequency speaker unit LS, LP, CS, CP Dividing network

Claims (1)

(57) [Scope of request for utility model registration] 1. A speaker system for dividing an amplifier output audio signal into a plurality of signal bands by an unbalanced dividing network and supplying the divided signal bands to a plurality of speaker units for reproduction, wherein the audio signals are transmitted to the plurality of speaker units through the dividing network. And a plurality of negative signal supply terminals connected to supply a plurality of negative signals to the plurality of speaker units, wherein the plurality of speaker units are connected to each other. And a speaker signal output terminal of the amplifier and a speaker cable connected between the plurality of negative signal supply terminals and a ground terminal of the amplifier.