JP2600179Y2 - Sound equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio device having a CD changer and a head unit, and more particularly to an audio device suitable for switching between a CD changer output and a source output.

[0002]

2. Description of the Related Art Conventionally, a reproduction output signal from a CD changer is supplied to a head unit, and the head unit
When the changer mode was set, the playback output signal of the CD changer could be output from the speaker via the source switch.

When the head unit is set in a source section, for example, a tuner, a signal from the tuner can be output from a speaker via a source switch.

As described above, the output signal from the CD changer and the output signal from the source section can be arbitrarily output from the speaker by switching the source switch.

[0005]

SUMMARY OF THE INVENTION In the above-described audio equipment having a conventional CD changer and a head unit, the CD magazine is operated by operating a magazine eject switch of the CD changer with the head unit set to the CD changer mode. When ejected, a display indicating "no CD magazine" is displayed on the display of the head unit. Therefore, the user has to insert the CD magazine again and load it into the CD changer to operate the CD changer, or to switch to another source to operate.

However, when the CD magazine is ejected while the head unit is in the CD changer mode, C
The output of the D changer is in a non-signal state, and there is a disadvantage that the speaker output remains in a silent state unless the user performs any operation.

The present invention has been made in view of the above points, and aims at solving the drawbacks of the prior art. The source switch of the head unit is controlled by a magazine eject switch operation signal, and other objects are controlled. It is to provide audio equipment that is automatically switched to the source.

[0008]

The audio device of the present invention is a C device.
In an audio apparatus including a D changer and a head unit, the CD changer includes a magazine for loading a CD, a reproducing unit for reproducing the CD loaded in the magazine, and an eject switch for discharging the magazine. First control means for outputting a control signal in response to the operation of the eject switch, wherein the head unit switches an input selected by switching an input from the reproducing means or an input from another source. Source switching means for outputting a signal to an amplifier, storage means for storing an input selected before the source switching means is switched, and storage means in response to a control signal output from the first control means And a second control unit for controlling the source switching unit so as to switch to the input stored by the control unit.

[0009]

The CD changer is connected to the source changeover switch of the head unit, and another source output signal is connected to the source changeover switch. When the CD magazine is ejected, the source changeover switch changes just before the operation of the magazine eject switch. This is an audio device that controls to select a source (hereinafter, referred to as a last source).

According to the invention, a mute circuit is provided at the output of the CD changer, and the magazine eject switch is operated to eject the CD magazine. On the other hand, when a magazine eject instruction signal is input to a microcomputer (hereinafter simply referred to as a microcomputer) by operating a magazine eject switch, the mute circuit is controlled, and the output of the CD changer is turned off.

The magazine discharge instruction signal is supplied to the microcomputer of the head unit via a communication line connecting the microcomputer of the CD changer and the microcomputer of the head unit, and controls the source changeover switch to select the last source. .

That is, by operating the magazine eject switch, the CD magazine is ejected, the mute circuit operates, and the output of the CD changer becomes a no-signal state.
The source switch of the head unit is switched to the last source and output.

As described above, when the CD magazine is ejected by the magazine eject switch, the output of the head unit becomes
For example, the output can be switched to the last source that has been listened to before, and the silent state as in the related art can be eliminated.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an audio apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing the configuration, and FIG. 2 is a flowchart showing the operation of the head unit.

In FIG. 1, reference numeral 1 denotes a CD changer. The CD changer 1 reproduces a CD by loading a CD magazine into a CD reproducing device 2. Reference numeral 3 denotes a mute circuit provided at the output of the CD reproducing device 2,
The mute circuit 3 mutes the reproduction output signal of the CD reproducing device 2 and outputs the signal to a CD changer reproduction output terminal 5 via an umb 4.

Reference numeral 6 denotes an operation key for sending instruction data to the microcomputer 8, reference numeral 7 denotes a magazine eject switch for instructing ejection of the CD magazine, and reference numeral 8 denotes a microcomputer. , RAM, input port, output port (not shown),
A program for controlling the CPU is written in the ROM, and the CPU fetches necessary data from the input port according to the program, or performs arithmetic processing while transmitting and receiving data to and from the RAM. The data is output to the data output terminal 9 in response.

Reference numeral 10 denotes a head unit. The head unit 10 includes a reproduction signal input terminal 12 connected to the CD changer reproduction output terminal 5 and a signal line 11;
It has a data output terminal 9 and a data input terminal 17 connected by a communication line 18. Reference numeral 13 denotes another source unit. The source unit 13 is, for example, a tuner unit 14, a tape unit 1 or the like.
5, a DAT unit 16 and the like.

Reference numeral 19 denotes a source changeover switch. The source changeover switch 19 can switch between a reproduction signal of the CD changer 1 and an output signal of another source section 13. 2
1 is output. Reference numeral 22 denotes an operation key for arbitrarily switching the source. An operation signal from the operation key 22 is supplied to a microcomputer 23, and the microcomputer 23 can control the source switch 19 and the display 24.

By operating the operation key 22 of the head unit 10, the audio device thus configured can output a source signal from the speaker 21 in accordance with the switching state of the source switch 19.

When the head unit 10 is switched to the CD changer 1 and the output signal from the CD reproducing device 2 is output from the speaker 21, the user operates the magazine eject switch 7 of the CD changer 1 for some reason. Then, when the CD magazine is ejected, the operation signal of the magazine eject switch 7 is sent to the microcomputer 8.
And the mute circuit 3 provided at the output of the CD reproducing device 2 is muted ON to control the output terminal 5 to be in a no-signal state.

At the same time, the ejection instruction signal of the magazine eject switch 7 is transmitted from the microcomputer 8 to the communication line 18.
Is supplied to the microcomputer 23 of the head unit 10 through
The display 24 indicates "no CD magazine".

The operation in which the microcomputer 23 of the head unit 10 receives the command of the ejection instruction from the magazine eject switch 7 and controls the source changeover switch 19 will be described with reference to the flowchart shown in FIG.

When the microcomputer 23 of the head unit 10 receives a command from the magazine eject switch 7 via the communication line 18 (step S1), the microcomputer 23
Reference numeral 3 controls the source changeover switch 19, recalls a source (hereinafter, referred to as a last source) that had been switched immediately before operating the magazine eject switch from the memory RAM of the microcomputer 23 (step S2), and switches to the last source (step S2). Step S3), the magazine eject switch 7 outputs a signal from the last source to the speaker 21 via the amplifier 20.

As described above, the magazine eject switch 7 of the CD changer 1 is ejected, the CD magazine is ejected, the mute circuit 3 is turned on, and the output terminal 5 of the CD changer 1, that is, the signal line 11 of the head unit 10 is connected. Even if the input terminal 12 is in a no-signal state,
The source changeover switch 19 of the head unit 10 automatically switches to the last source and is output from the speaker 21, so that no sound is left.

The last source may be a received signal from the tuner unit 14, a reproduced signal from the tape unit 15, a reproduced signal from the DAT unit 16, or the like. In addition, the operation of the magazine eject switch 7 is displayed on the display 24 for the user who is operating, and a signal is issued by a beep sound or the like. The operation may be switched to the last source.

[0026]

As described above, the audio device according to the present invention can automatically output the last source signal by operating the magazine eject switch of the CD changer even if the output of the CD changer becomes a no-signal state. Therefore, there is an effect that defects such as a silent state caused by operation of the magazine eject switch can be eliminated.

In particular, when the in-vehicle CD changer unit is installed in the vehicle compartment and another operation such as switching to another source or loading of another CD magazine cannot be performed after the operation of the magazine eject switch, it is automatically performed. In addition, it is very effective that the source changeover switch is switched to the last source to continue the output, and there are effects such as improved operability and convenience.

In addition, it has excellent features such as a simple structure, and because it depends on the software of the microcomputer, it is easy to implement without increasing the cost.

[Brief description of the drawings]

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

FIG. 2 is a flowchart illustrating the operation of the head unit of the present invention.

[Explanation of symbols]

 Reference Signs List 1 CD changer 2 CD playback device 3 Mute circuit 5 CD changer playback output terminal 6 Operation key 7 Magazine eject switch 8 Microcomputer 9 Data output terminal 10 Head unit 11 Signal line 12 CD changer playback signal input terminal 13 Source unit 17 Data input terminal 18 Communication line 19 Source switch 21 Speaker

Claims (2)

(57) [Scope of request for utility model registration] 1. An audio device comprising a CD changer and a head unit, wherein the CD changer is a CD
For loading a magazine, a reproducing means for reproducing a CD loaded in the magazine, an eject switch for ejecting the magazine, and a first control for outputting a control signal in response to an operation of the eject switch Means, the head unit comprising: a source switching means for outputting a signal of a selected input to an amplifier by switching an input from the reproducing means or an input from another source;
A storage means for storing an input selected before the source switching means is switched, and a storage means for switching to an input stored in the storage means in response to a control signal output from the first control means. An audio device comprising: a second control unit that controls a source switching unit. 2. An audio apparatus according to claim 1, further comprising a mute circuit for muting an output of said reproducing means when said magazine is ejected.