JPH02134008A - Acoustic equipment capable of connecting external equalizer - Google Patents

Abstract

PURPOSE:To simplify the constitution by detecting it that a car stereo main body is not connected to an external equalizer and connecting an audio circuit and an amplifier electrically. CONSTITUTION:Since a control signal from an external equalizer 2 is not inputted to a switch drive circuit 9 when the external equalizer 2 is not connected to a car stereo main body 1, a switch drive circuit 9 closes a switch 8. Then an audio signal from an audio circuit 3 is inputted to an amplifier 4 through a connection circuit 7 and not through the external device and outputted in sound from an external speaker 11. Since the unconnection to the external equalizer 2 is detected automatically and the audio circuit 1 and the amplifier 4 are connected electrically in this way, it is not required to mount externally mount components such as a short-circuit pin to the outside of the car stereo main body 1 thereby simplifying the constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 7 The present invention relates to audio equipment to which an external equalizer can be connected, such as a car stereo.

[Prior Art] As a car stereo to which an external graphical liner unit 1 can be connected to the main body of the car stereo, there is a car stereo as shown in FIG. 3.

Figure 3 shows the car stereo main body 21 and the external equalizer 2.
2 is connected and operating. The car stereo body 21 has built-in an audio circuit 23 that outputs an audio signal and an amplifier 24 that amplifies the audio signal. Furthermore, it has a connection pin 25 that is an output terminal for outputting the audio signal from the audio circuit 23 to the external equalizer 22, and a connection pin 26 that is an input terminal for inputting the audio signal from the external equalizer 22.

Here, if you want to operate only the car stereo main unit 21 without using the external equalizer 22, connect the connection pins 25 and 26, which are the input/output terminals with the external equalizer 22, to each other and connect the audio circuit 23 and the amplifier 24. It is an essential condition for the circuit to connect between them. Normally,
For this purpose, a configuration is adopted in which a small short pin is used and the short pin is connected to the car stereo body 21 from the outside.

However, when a short pin is connected to the outside of the car stereo main body 21, a protective cover for the short pin is required, which increases the number of exterior parts, and also increases the number of man-hours for assembly, reducing work efficiency. There are drawbacks that reduce it. Furthermore, as a result of the protrusion of the outer surface of the car stereo main body 21, there are disadvantages such as wasting space and spoiling the appearance.

On the other hand, the car stereo main body 21 shown in FIG.
When applied to the away method, since the show 1 to pins are not connected at the stage of installing the device, there is a drawback that the car stereo itself becomes unusable if the external equalizer is removed.

Note that the above drawbacks are not limited to car stereos, but exist in general audio equipment to which an external equalizer can be connected. The same applies to so-called component i type devices that do not have a built-in amplifier and are connected to an external amplifier.

[Problems to be Solved by the Invention] The present invention has been proposed to solve the problems of the prior art as described above, and its purpose is to automatically It has a simple configuration that can detect that it is not connected to an external equalizer and connect the audio circuit and amplifier electrically.
An object of the present invention is to provide an audio device to which an external listener can be connected.

[Means for Solving the Problems] Audio signals from the audio equipment GJ1 and A-dio circuit to which the external equalizer 1 according to the present invention can be connected are directly sent to the built-in amplifier or external amplifier without passing through an external firearm. A connection circuit for input is provided, a switching means is provided in the middle of this connection circuit, a switching means driving circuit is provided to drive the switching means, and a control signal from an external equalizer is input to the switching means driving circuit. The terminal is 89 digits long.

Then connect an external equalizer and control it via the control terminal? When the jU signal is input, the switching means is set to the open state by the switching means drive circuit, and when an external equalizer is not connected and no control signal is input, the switching means is set to the closed state by the switching means driving circuit. It is characterized by

[Function] In the present invention having the above configuration, when an external equalizer is not connected, the opening/closing means is automatically closed, and the audio signal from the audio circuit is transmitted without passing through an external device. Can be input directly to the built-in amplifier or external amplifier. Therefore, the so-called Take-away
Even if the external equalizer is removed after the device is installed, it can be used only with the device itself.

In addition, since the present invention only requires incorporating a connection circuit, a switching means, a switching means driving circuit, and a control terminal into the main body of the device, the work is easy. If the parts are grown, there will be no wasted space.

[Embodiment] An embodiment of the audio equipment according to the present invention will be specifically described below with reference to FIG.

In FIG. 1, a car stereo main body 1 and an external equalizer 2 are connected and the connection state when they are in operation is reduced.

First, the car stereo body 1 includes an audio circuit 3 that outputs an audio signal, an amplifier 4 that amplifies the audio signal, and an output terminal 5 that outputs the audio signal from the audio circuit 3 to an external equalizer 2. external equalizer 2
An input terminal 6 for inputting an audio signal from is provided. The above-mentioned obscene configuration is similar to the prior art described above.

In this embodiment, a connection circuit 7 is provided which directly inputs the audio signal from the audio circuit 3 to the amplifier 4 without passing through an external device. A switch 8 is provided. The switch 8 is driven by a switch drive circuit (opening/closing means drive circuit) 9, and the switch drive circuit 9 is configured to receive a control signal from the external equalizer 2 through a control terminal 10. It has become. Here, the switch drive circuit 9 is set to open the switch 8 when there is a control signal from the external equalizer 2, and to close the switch 8 when there is no control signal.

Note that 11 in the figure is an external speaker connected to the amplifier 4.

The operation of the embodiment of FIG. 1 having the above-described configuration is as follows.

First, as shown in FIG. 1, when the external equalizer 2 is connected to the car stereo main body 1, a control signal from the external equalizer 2 is input to the switch drive circuit 9 via the control terminal 10, and the switch drive circuit 9 is input to the switch drive circuit 9 via the control terminal 10. Circuit 9 is switch 8
Open state. Therefore, the audio signal from the audio circuit 3 is outputted to the external equalizer 2 via the output terminal 5, and after having its frequency characteristics adjusted, is inputted to the amplifier 4 in the car stereo body 1 via the input terminal 6. Audio is output from the external speaker 11.

Further, when the external equalizer 2 is not connected to the car stereo main body 1, the control signal from the external equalizer 2 is not input to the switch drive circuit 9, so the switch drive circuit 9 closes the switch 8. Therefore, the audio signal from the audio circuit 3 is directly input to the amplifier 4 via the connection circuit 7 without going through any external equipment, and is output as audio from the external speaker 11.

As described above, in this embodiment, when operating the car stereo main body 1 without connecting to the external equalizer 2,
It automatically detects that it is not connected to the external equalizer 2 and can electrically connect the audio circuit 1 and the amplifier 4. Since it is no longer necessary to install external parts, it can contribute to simplifying the configuration and improving work efficiency.

Further, in this embodiment, the car stereo body 1 includes a connection circuit 7,
Since only the switch 8, switch drive circuit 9, and control terminal 10 are incorporated, the work is easy.
If the circuit configuration is miniaturized or the component configuration is integrated with other built-in circuits, no space will be wasted.

In addition, this embodiment uses the so-called l'-ake-away
Even if the external equalizer 2 is removed after the equipment is installed, it can be used only with the car stereo main body 1, improving versatility.

Note that the present invention is not limited to the above embodiments,
For example, as shown in FIG. 2, a microcomputer 12 is connected between the control terminal 10 and the switch drive circuit 9, and the microcomputer 12 determines the presence or absence of a control signal and sends an operating signal to the switch drive circuit 9. It is also possible to configure it as follows.

Further, the present invention is applicable not only to car stereos but also to general audio equipment to which an external equalizer can be connected. Furthermore, it can be similarly applied to so-called component type equipment that does not have a built-in amplifier and is connected to an external amplifier.

[Effects of the Invention] As explained above, the 8-sound device to which an external equalizer of the present invention can be connected can be used in practical use as in the past by providing a connection circuit, a switching means, a switching means driving circuit, and a control terminal. It automatically detects that it is not connected to an external equalizer and connects the audio circuit and amplifier electrically without using short pins, which have many drawbacks.The configuration is simple and easy to work with. This has the advantage of being easy to use and having excellent practicality.

[Brief explanation of drawings]

Figure 1 shows a sound WI to which the external equalizer of the present invention can be connected.
FIG. 2 is a block circuit diagram showing one embodiment of the N unit, FIG. 2 is a block circuit diagram showing another embodiment of the present invention, and FIG. 3 is a block circuit diagram showing an audio device to which a conventional external liner can be connected. Illustrated. DESCRIPTION OF SYMBOLS 1... Car stereo body, 2... External equalizer 3... Audio circuit, 4... Amplifier, 5... Output terminal, 6... Input terminal, 7... Connection circuit, 8...・
- Switch, 9... Switch opening/closing means, 10... Control terminal, 11... External speaker, 12... Microcomputer.

Claims (1)

[Scope of Claim] An audio device to which an external equalizer can be connected, comprising: an audio circuit that outputs an audio signal, an output terminal that outputs the audio signal from the audio circuit to the external equalizer, and a built-in amplifier that outputs the audio signal from the external equalizer. Or an input terminal for inputting to an external amplifier, a connection circuit for inputting the audio signal from the audio circuit directly to the built-in amplifier or external amplifier without going through an external device, and an opening/closing means provided in the middle of the connection circuit. , an opening/closing means drive circuit that opens the opening/closing means when there is a control signal from an external equalizer and closes the opening/closing means when there is no control signal; An audio device to which an external equalizer can be connected, characterized in that it is equipped with a control terminal for inputting to an external equalizer.