JPS61163710A - Loudspeaker device - Google Patents

Abstract

PURPOSE:To execute an economical radiation design in a device which contains a multi-amplifier using a power IC for constituting two power amplifiers, by providing a limiter corresponding to a sound pressure difference of a tweeter and a woofer, on an input of the power amplifier for the tweeter. CONSTITUTION:An input signal which has passed through a buffer amplifier 1 is applied to a high-pass filter 2 and a low-pass filter 5. The input signal which has passed through the high-pass filter 2 is outputted to a tweeter 4 through a power amplifier 3a. The input signal which has passed through the low-pass filter 5 is outputted to a woofer 6 through a power amplifier 3b. The input signal which has passed through the high-ass filter 2 is limited by a limiter constituted of Zener diodes 7, 8, therefore, an output of the power amplifier 3a is limited. In this way, by lowering the output of one power amplifier, an economical radiation design can be executed in a device which contains a multi- amplifier using a power IC which can constitute two power amplifiers.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a speaker device with a built-in power amplifier.

2. Description of the Related Art In recent years, in order to achieve compactness and high performance of speaker devices, it has become common to see speaker devices equipped with electronic circuits such as power amplifiers.

An example of the above-mentioned conventional speaker device will be described below with reference to the drawings.

FIG. 2 is a block diagram of a conventional two-way multi-amplifier built-in speaker device. 1 is a power amplifier using a power amplifier, 2 is a bypass filter, and 3 is a power amplifier using a power ICj.

Consists of 3b. 4 is a tweeter, 6 is a ronox filter, and 6 is a woofer.

Regarding the speaker device configured as described above.

The operation will be explained below.

First, an input signal that has passed through a buffer amplifier 1 is applied to a bypass filter 2 and a low-pass filter 6. The input signal that has passed through the bypass filter 2 is output to the tweeter 4 via the power amplifier a&. The input signal that has passed through the low-pass filter 6 is output to the woofer 6 via the high-frequency amplifier 3b.

Problems to be Solved by the Invention However, in the above configuration, even when the sound pressure of the tweeter 4 is higher than the sound pressure of the woofer 6d, the power amplifiers 3& and 3b are in the package of the power amplifier Ci. Since the same power supply is used, the output of the tweeter power amplifier 3& and the woofer power amplifier 3b becomes the same, resulting in unnecessary power being output to the tweeter power amplifier 3a, which requires a heat dissipation design that exceeds what is necessary. There was a problem that it was not possible.

In view of the above problems, the present invention provides a multi-amplifier built-in speaker device that uses a power IC that can configure two power amplifiers and has an economical fxw thermal design.

Means for Solving the Problems In order to solve the above-mentioned problems, the speaker device of the present invention has a power I which can constitute two power amplifiers.
A limiter is provided at the input of one of the power amplifiers to limit the level of the input signal.

Effect of the Invention The present invention has the above-described configuration, and the input of the power amplifier for the tweeter is provided with a limiter according to the sound pressure difference between the tweeter and the woofer, thereby limiting the input signal and limiting the output of the power amplifier. Even in a speaker device with a built-in multi-amplifier using a power IC that can constitute an amplifier, economical heat dissipation design can be performed.

Embodiment Hereinafter, a speaker device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a speaker device in an embodiment of the present invention. In FIG. 1, 1 is a buffer amplifier, 2 is a power amplifier using a bypass filter, and a 3H power IC, which is composed of two power amplifiers 31L and 3b. 4 is a tweeter, 6 is a low-pass filter, and 6 is a woofer, which have the same configuration as the conventional example. Zener diodes 7 and 8 are connected in series in opposite directions to form a limiter as shown in FIG.

The operation of the speaker device configured as described above will be described below.

The input signal that has passed through the buffer amplifier 1 is applied to a bypass filter 2 and a low-pass filter 6.

The input signal that has passed through bypass filter 2 is sent to power amplifier 3.
It is output to the tweeter 4 via a. Low pass filter 5
The input signal passing through is output to the woofer 6 via the power amplifier 3b. The above operation is the same as the conventional example, but since the input signal passing through the bypass filter 2 is limited by the limiter constituted by the Zener diode 7.8, the output of the power amplifier 32L is limited.

Effects of the Invention As described above, according to the present invention, one of the power amplifiers is equipped with a power IC that can configure two power amplifiers, and a limiter that limits the level of the input signal at the input of one of the power amplifiers. By lowering the output of the power amplifier, an economical heat dissipation design can be achieved even in a speaker device with a built-in multi-amplifier using a power IC that can configure two power amplifiers.

[Brief explanation of drawings]

FIG. 2 is a block diagram of a speaker device with a built-in speaker. 1... Buffer amplifier, 2... Bypass filter, 3, 31L, 3b... Power amplifier, 4... Group tweeter, 5... Low pass filter. , 6... Wooha. 7.8...Zener diode.

Claims (1)

[Claims] Power IC that can configure multiple power amplifiers
A speaker device comprising: a speaker connected to the plurality of power amplifiers; and a limiter that limits the level of an input signal at the input of one of the power amplifiers.