JPH062392Y2 - Loudspeaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the invention: [Industrial field of application] The present invention relates to a loudspeaker, and is particularly used in the field of expanding and enhancing a low frequency range.

[Prior Art] FIG. 2 is a block diagram of a low-frequency range expansion type loudspeaker used in the field of audio. This bass range expansion type loudspeaker is a loudspeaker which connects an amplifier 1 equipped with a SEPP-OTL system circuit and a speaker system 3 and further drives two sets of SEPP-OTL circuits 2a and 2b in reverse phase. The bass range is expanded by adding a so-called BTL circuit type loudspeaker that connects the bass speaker system 4 between the respective output points.

[Problems to be Solved by the Invention] Such a conventional bass range expansion type loudspeaker device can measure the bass range, but requires two amplifiers 1 and 2 and, from a different viewpoint, Three SEPP-OTL circuit type amplifiers (1, 2a, 2b) are required, which is expensive.

The present invention has been made in view of the above points, and was made as an attempt to provide a loudspeaker capable of expanding and enhancing the low frequency range at low cost.

Configuration of the Invention: As shown in the block diagram of FIG. 1, the present invention has an input terminal to which an L channel or R channel input signal of a monaural signal or a stereo signal is applied and a first power amplifier connected to the input terminal. 11 and a low frequency band amplifier 14 connected to the input terminal for amplifying a low frequency signal component of the input signal, a phase inverter 13 connected to the output of the low frequency band amplifier 14 and a phase inverter 13 connected to the output of the phase inverter 13 Power amplifier 10 having a second power amplifier 12 and a first output terminal 11a connected to the output of the first power amplifier 11 and a second output terminal 12a connected to the output of the second power amplifier 12; A speaker device 20 having a speaker 22 for mid-high frequencies and a speaker 21 for mid-high frequencies is provided, and one input end of the speaker 21 for mid-high frequencies has the first output terminal 11 The other input ends of the bass speaker 22 are connected to the ground, respectively, and one input end of the bass speaker 22 is connected to the first input terminal a.
The other input end of the output terminal 11a is the second output terminal 12
A loudspeaker connected to each of a.

[Embodiment] FIG. 1 shows a circuit block diagram of an embodiment of the present invention. In FIG. 1, the low frequency band amplifier 14 uses a fixed resistor R3 and a variable resistor VR as a feedback resistor of an operational amplifier A, and capacitors C1 and R4 and a semiconductor inductance L are connected in series between the midpoint of the variable resistor VR and ground. The impedance element of the connection is connected so that the amplification degree in a predetermined low band can be varied. The speaker device 20 includes a mid-high range speaker 21 and a low-range speaker 22. The first power amplifier 11 and the second power amplifier 12 are in positive phase between the inputs,
Alternatively, the power amplifier has a reverse phase, and the second power amplifier 12
The phase of the input signal passing through
It will be reversed once. When the input and output of the first power amplifier 11 are in the positive phase and the input and output of the second power amplifier 12 are in the opposite phase, the phase inverter 13 is included in the second power amplifier 12.

Then, one input terminal (+) of the mid-high range speaker 21 is connected to the first output terminal 11a (hot side terminal), and the other input terminal (-) is connected to the ground side terminal 11b of the first power amplifier 11, respectively. And one input end (+) of the bass speaker 22 is connected to the first output terminal 11a.
The other input terminal (−) is connected to the (hot side terminal) and the second output terminal 12a (hot side terminal), respectively.

In the loudspeaker according to the embodiment of the present invention, the low frequency band can be enhanced by the low frequency band amplifier 14, and the first power amplifier 1
The output between the first output terminal 11a for the output of 1 and the second output terminal 12a for the output of the second power amplifier 12 is the bass speaker 2
2 can be supplied to extend and enhance the bass range. Moreover, when the low frequency signal and the high frequency signal are simultaneously input, the input signal of the first power amplifier 11 becomes lower than the input level of the second power amplifier 12, and the output signal of the first power amplifier 11 causes waveform distortion. Therefore, the sound reproduced from the mid-high range speaker 21 is not distorted, and the output signal between the first output terminal 11a of the output of the first power amplifier 11 and the second output terminal 12a of the output of the second power amplifier 12 is low. Speaker 22
The low-frequency speaker 22 reproduces only the low-frequency signal due to its high-frequency cutoff characteristic.

That is, when the amplitude of the low frequency signal is up to the clip level Vc, the low frequency range can be expanded and enhanced, and the reproduced sound of the mid-high range speaker 21 and the low range speaker 22 is not distorted, which is low. It is possible to measure the expansion of the reproduced sound pressure level of the range signal.

Effect of the invention: The loudspeaker of this invention can expand and enhance the low range,
Two SEPP-OTL circuit type amplifiers are sufficient as an amplifier for driving the mid-high range speaker 21 and the low-range speaker 22, and the cost is low. Moreover, not only in the case of only the low frequency signal, but when the low frequency signal and the high frequency signal are input at the same time, the distortion of the reproduction of the high frequency signal does not occur,
The low frequency signal is the clip level of the first power amplifier 11 and the second level.
The amplitude can be expanded up to the clip level Vc determined by the clip level of the power amplifier 12, and a reproduced sound without distortion can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining the present invention, and FIG. 2 is a block diagram for explaining a conventional example. DESCRIPTION OF SYMBOLS 10 ... Power amplifier device, 11 ... 1st power amplifier, 12 ... 2nd power amplifier, 13 ... Phase inverter, 14 ... Low frequency band amplifier, 20 ... Speaker device, 21 ... Mid-high range speaker,
22 ... Low-pitched speaker.

Claims (1)

[Scope of utility model registration request] 1. An input terminal to which an input signal is applied, a first power amplifier (11) connected to the input terminal, and a low frequency band amplifier connected to the input terminal for amplifying a low frequency signal component of the input signal. (14) and the low frequency band amplifier (1
4) A phase inverter (13) connected to the output and a second power amplifier (12) connected to the output of the phase inverter (13).
And a first output terminal (11a) connected to the output of the first power amplifier (11) and a second output terminal (12a) connected to the output of the second power amplifier (12). ), A speaker device (20) having a bass speaker (22) and a mid-high range speaker (21), and one input end of the mid-high range speaker (21) has the first output terminal (11a). ) Is connected to the ground at the other input end, and one input end of the bass speaker (22) is connected to the first output terminal (11a) and the other input end is connected to the second output terminal (12a). The loudspeaker is characterized in that it is connected to each.