JPH08116586A - Audio system - Google Patents

Abstract

PURPOSE: To provide the audio system whose extension is facilitated by the use of a simple configuration. CONSTITUTION: A head unit 1 is provided with a high pass filter 12 extracting a high frequency component signal of an audio signal from a source 11, a changeover switch 14 switching selectively a high frequency component signal of an audio signal extracted by the high pass filter 12 or an audio signal outputted from the source 11, and an amplifier 13 amplifying a signal selected by the changeover switch 14. An output signal from the amplifier 13 is reproduced by a satellite speaker 2 for reproducing high frequency component and an output signal obtained by extracting a low frequency component of the audio signal with the power amplifier 4 with a low pass filter and amplifying it is reproduced by a sub woofer 3 for low frequency component reproduction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio system, and more particularly to an audio system having a simple structure and easily expanding the system.

[0002]

2. Description of the Related Art As shown in FIG. 2, a multi-system in a conventional audio system is a so-called head unit (main body) in which a source such as a cassette tape and a tuner and an amplifier are built in one housing. The audio signal from the pre-out output of 1 is separated by the channel divider 5 into the mid-high range component and the low-range component, and then the respective component signals are amplified by the power amplifiers 6 and 7, and the mid-high range component is output by the satellite speaker 2. The low frequency component is reproduced by the woofer speaker 8.

Further, in the simple multi-system, FIG.
As shown in, the built-in amplifier built in the head unit 1 amplifies the audio signal component of the entire band and reproduces it from the satellite speaker 2, and the pre-out output of the head unit 1 is provided with a low-pass filter (LPF). Only the low frequency component is amplified by the power amplifier 4 and reproduced from the subwoofer speaker 3.

[0004]

Among the conventional systems as described above, in the audio system shown in FIG. 2, the channel divider 5 and the power amplifier 6 for each band are provided.
Since 7 and 7 are required, there is a problem that the system becomes very expensive. Further, when the head unit 1 has a built-in power amplifier, this power amplifier is not used at all, which is wasteful.

Further, in the system shown in FIG. 3, since all the band components are reproduced from the satellite speaker 2, after all,
There is a problem in sound quality that the low frequency component is reproduced from both the satellite speaker 2 and the subwoofer speaker 3.

Therefore, an object of the present invention is to provide an audio system which has a simple structure and whose system expansion is easy.

[0007]

In order to solve the above-mentioned problems, an audio system according to the present invention comprises a high-pass filter for extracting a high frequency component signal of an audio signal output from a source, and an audio output from the source. Signal and a high-frequency component signal of the audio signal extracted by the high-pass filter, and a head unit having a changeover switch, an amplifier for amplifying the signal selected by the changeover switch, and an output from the amplifier Satellite speaker for high frequency component reproduction for reproducing signal and outputting sound, power amplifier having low pass filter function for extracting low frequency component of the audio signal and amplifying the extracted low frequency component, and the power amplifier The subwoofer speaker for low-frequency component reproduction that reproduces the output signal from the Configured to include a mosquito, a.

Here, the cutoff frequency of the high pass filter can be made variable, and the volume level of each band of the high pass filter can be adjusted.

[0009]

According to the present invention, the head unit has a high-pass filter for extracting a high-frequency component signal of an audio signal from the source, an audio signal output from the source, and a high-frequency component signal of the audio signal extracted by the high-pass filter. A switch for selectively switching between and is provided with an amplifier for amplifying the signal selected by the switch, and an output signal from this amplifier is reproduced and output by a satellite speaker for reproducing high frequency components, and a power with a low-pass filter is provided. An output signal obtained by extracting and amplifying the low frequency component of the audio signal by an amplifier is reproduced and output by a subwoofer speaker for reproducing the low frequency component.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a basic configuration block diagram showing an embodiment of an audio system according to the present invention.

In FIG. 1, the head unit 2 includes a source 11, a high-pass filter (HPF) 2, and an amplifier 13.
And the changeover switch 14 is built in. The high-pass component of the audio signal from the source 11 is extracted by the high-pass filter 12 and sent to the input terminal S1 of the changeover switch 14. On the other hand, the audio signal from the source 11 is sent to the input terminal S2 of the changeover switch 14. The change-over switch 14 is the source 11 supplied to the input terminals S1 and S2.
From the high-pass filter 2 and the audio signal from the high-pass filter 2 are selected and output to the amplifier 13.
The signal amplified by the amplifier 13 is output from the speaker out terminal, and the satellite amplifier 2 reproduces sound. In addition, the audio signal from the source 11 is fed from the pre-out terminal to a low-pass filter (LPF) built-in amplifier 4
After the low frequency component is extracted by, the signal is amplified and reproduced by the subwoofer speaker 3.

In the above embodiments, the cutoff frequency of the high pass filter 12 can be made variable,
It is also possible to adjust the volume for each band. Also,
The output of the high-pass filter 12 may be used by connecting an external amplifier instead of using the built-in amplifier 13.

[0013]

As described above, according to the audio system of the present invention, the problem that the low frequency component is reproduced from both the satellite speaker and the subwoofer speaker as shown in FIG. 3 and the sound quality is deteriorated is solved. To be done. Further, since the mid-high range is reproduced by using the amplifier 13 built in the head unit 1, it is not necessary to provide the two external amplifiers 6 and 7 as shown in FIG. 2, and an inexpensive system can be realized. Furthermore, since the channel divider 5 shown in FIG. 2 is not required, not only can the system configuration be further simplified and an inexpensive system can be realized, but also the connection configuration can be simplified and the system expandability can be facilitated. Becomes

Further, according to the present invention, since the changeover switch is provided, it is easy to upgrade the audio system. For example, when purchasing the head unit, the changeover switch is connected to the input terminal S2 side, and the source 1
The audio signal of the entire band from 1 is amplified by the amplifier 13 and reproduced and output from the satellite speaker 2. However, if the low frequency component is emphasized and reproduced and output, the pre-out output of the head unit 1 is performed. If the amplifier 4 with built-in low-pass filter and the subwoofer 3 are connected to the terminals and the changeover switch 14 is connected to the input terminal S1 side, the high frequency component is reproduced from the satellite speaker 2 and the low frequency component is reproduced from the subwoofer speaker 3. It will be output and the system upgrade can be done easily.

[Brief description of drawings]

FIG. 1 is a basic configuration block diagram showing an embodiment of an audio system according to the present invention.

FIG. 2 is a basic configuration block diagram of a conventional audio system.

FIG. 3 is a basic configuration block diagram of another conventional audio system.

[Explanation of symbols]

 1 Head unit 2 Satellite speaker 3 Subwoofer speaker 4 Power amplifier with LPF 5 Channel divider 6,7 Power amplifier 11 Source 12 High pass filter 13 Built-in amplifier 14 Changeover switch

Claims (3)

[Claims] 1. A high-pass filter for extracting a high-frequency component signal of an audio signal output from a source, and an audio signal output from the source and a high-frequency component signal of the audio signal extracted by the high-pass filter are selected. A head unit having a changeover switch for selectively changing the signal, an amplifier for amplifying a signal selected by the changeover switch, a satellite speaker for reproducing a high frequency component for reproducing the output signal from the amplifier and outputting the sound, A power amplifier having a low-pass filter function for extracting a low-frequency component of an audio signal and amplifying the extracted low-frequency component, and a sub-range for reproducing a low-frequency component for reproducing an output signal from the power amplifier to output a sound. An audio system comprising: a woofer speaker. 2. The audio system according to claim 1, wherein a cutoff frequency of the high pass filter is variable. 3. The audio system according to claim 1, wherein the volume level of each band of the high pass filter is adjustable.