JPH054134Y2 - - Google Patents

Description

[Detailed description of the invention] "Purpose of the invention" (Field of industrial application) The present invention relates to an audio system, and in particular, an audio system in which a specified source device starts or stops playing simply by operating an input source selector. Regarding.

(Prior Art) Conventionally, when switching the input source in an audio system, the input selector on the amplifier side is set to the desired source device, such as a player, and then the player's start switch is turned on, or Conversely, complicated operations such as first turning on the player's start switch and then operating the input selector were required.

Therefore, in recent years, in order to make the switching operation described above easier, simply by operating the input source selector, the specified source device will automatically start playing, and a display will be displayed indicating that the specific input source has been selected. It has been proposed to do so. The outline will be explained with reference to FIG. Signal S ₁ from manual input source selector (not shown)
When ~S _o is input to the central switching unit 10, the corresponding signal input units I ₁ ~ _{I o} are connected to the power amplifier P, and a selection indicating which source device K ₁ ~ _{K o} is selected is made. Signals L ₁ to _{L o} are input to the control microcomputer 11 . The control microcomputer 11 outputs display designation signals M ₁ to _{M o} indicating which of the selected source devices K ₁ to _{K o} is, and the display unit 12 receives the signals and displays a predetermined display. will be done. On the other hand, the control microcomputer 11 sends a signal to set the source devices K ₁ to _{K o} to the performance start state.
X ₁ -X _o and signals Y ₁ -Y _o for setting the source devices K ₁ -K _o to a performance stop state are output.

For example, when the signal S ₁ selected from the manual input source selector is input to the central switching section 10, the signal input section I ₁ is connected to the power amplifier P, and the selection signal L ₁ is input to the control microcomputer 11. Ru.

From the control microcomputer 11, a display designation signal _M1 is input to the display unit 12, which turns on the display indicating the selected source device _K1 , and also sends a signal _X1 to set the performance start state. Input to source device _K1 .

As a result, the performance signal of the source device _K1 is outputted to the output terminal OUT via the signal input section _I1 , the central switching section 10, and the power amplifier P.

Next, when the selected signal S ₂ instead of the signal S ₁ is input from the manual input source selector to the central switching section 10, the signal input section I ₂ is connected to the power amplifier P, and the selection signal L ₂ is used as the control signal. input into the microcomputer 11 for use.

From the control microcomputer 11, a display designation signal _M2 is input to the display unit 12, which turns on the display indicating the selected source device _K2 , and also sends a signal _X2 to set the play start state. A signal Y 1 is input to the source device K ₁ , and a signal Y ₁ for setting the performance stop state is input to the source device K ₁ .

Therefore, instead of the performance signal of the source device _K1 , the performance signal of the source device _K2 is sent to the output terminal via the signal input section _I2 , the central switching section 10, and the power amplifier P.
Output to OUT.

(Problem to be solved by the invention) However, in the above-mentioned conventional device, two lines are required to control each source device to start or stop playing, and it is also necessary to have two lines to control the signals given to these lines. Since a control microcomputer is also required, there are problems such as a complicated circuit, increased cost, and decreased reliability.

The present invention was developed in view of the above points, and its purpose is to greatly simplify the circuitry involved in controlling the performance start or stop of each source device, thereby reducing costs and improving reliability. The object of the present invention is to provide an audio system that can achieve the following.

"Structure of the invention" (Means for solving problems) The audio system according to the invention is an audio system capable of amplifying a signal from a desired source device among a plurality of source devices. comprises a central switching section, a display section that displays a display corresponding to the switching state of the central switching section, and a selection control circuit connected between the central switching section and the display section, the selection control circuit comprising: ,
A source designation signal from the central switching section is output to each of the source devices and the display section, and each of the source devices is controlled by a control signal from one signal line in response to turning on/off of the corresponding display. It is configured to be controlled to start or stop playing.

(Embodiment) An embodiment of the audio system according to the present invention will be described based on FIGS. 1 and 2.

FIG. 1 is an overall block diagram, and FIG. 2 is an example of a specific circuit configuration.

In the figure, 1 is the entire audio system, K ₁ to _{K o}
indicate source devices such as tuners and players, which are selectively input to the power amplifier P. 2 is a central switching section that receives a signal S ₁ from a manual input source selector (not shown).
The source devices K 1 to K _o are selectively switched depending on the source device K ₁ to K _o . I ₁ to I _o are signal input units, and 3 is a selection control circuit, which sends source designation signals D ₁ to D _o outputted from the central switching unit 2 to the display unit 4 and each source device K ₁ to _{K o} . It is now output.
Signal lines C ₁ -C _o to each source device K ₁ -K _o correspond to display designation signals M ₁ -M _o , respectively.

For example, when the signal S ₁ selected from the manual input source selector is input to the central switching section 2, the signal input section I ₁ is connected to the power amplifier P, and the source designation signal D ₁ is input to the selection control circuit 3. Ru.

As a result, the display designation signal _M1 from the selection control circuit 3 becomes high level, and the display unit 4 turns on the display indicated by the selected source device _K1 . At the same time, the signal line _C1 from the selection control circuit 3 also becomes high level, causing the source device _K1 to start playing. At this time, M ₂ ~ excluding display designation signal M ₁
C ₂ to _{C o} except for M _o and the signal line C ₁ are all at low level.

As a result, the performance signal of the source device _K1 is outputted to the output terminal OUT via the signal input section _I1 , the central switching section 2, and the power amplifier P.

Next, when the signal S ₂ selected from the manual input source selector instead of the signal S ₁ is input to the central switching section 2, the signal input section I ₂ is connected to the power amplifier P, and the source designation signal D ₂ is It is input to the selection control circuit 3.

From the selection control circuit 3, the display designation signal M ₂ changes from low level to high level and is output to the display unit 4, turning on the display indicating the selected source device K 2, and at the same time turning on the display indicating the selected source device K ₂ , as well as displaying the previous display designation signal. M ₁ changes from high level to low level, source device M ₁
The display indicating this will be turned off. At the same time, the signal line
C ₂ also changes from low level to high level, causing source device K ₂ to start playing, and signal line C ₁ changes from high level to low level,
The source device K ₁ enters the playing stop state. In this case, M ₁ to M _o excluding the display designation signal M ₂ and C ₁ to C _o excluding the signal line C ₂ are all at low level.

Therefore, instead of the performance signal of the source device _K1 , the performance signal of the source device _K2 is sent to the output terminal via the signal input section _I2 , the central switching section 2, and the power amplifier P.
Output to OUT.

In this way, the source devices K ₁ to _{K o} each have one signal line C ₁ to one source device.
You can control the start and stop of the performance with C _o ,
There is no need for two signal lines for one source device as in the past. Moreover, since the control system can be simplified, a control microcomputer is not required, and the circuit can be simplified and costs can be reduced.

Note that since the selection control circuit 3 acts as a type of relay circuit, if it is controlled to be on/off by the external signal X, the display can be turned off.

This function is generally used by connecting an external source device that is not on the display board, such as a television, and turning off all the displays when this is selected, thereby preventing misidentification of the display. A specific example of the circuit configuration will be explained based on FIG.
When the external signal X is low level,
Transistors Q ₁ and Q ₂ are turned off, transistor Q ₃ is turned on, and power supply Vcc is supplied to transistors T ₁ to _{T o} . This allows source designation signals D ₁ to D _o
Displays the on/off status of the specified signal M ₁ ~
The light is output as M _o , and the light emitting diodes H ₁ to H _o in the display section 12 are turned on as appropriate.

On the other hand, when external signal X is set to high level, transistors Q ₁ and Q ₂ are turned on, and transistor
Q ₃ is turned off, the power supply to transistors T ₁ to _{T o} is cut off, and all display designation signals M ₁ to _{M o} become low level, so that all the displays are turned off.

"Effects of the invention" According to the audio system of the invention, it is possible to automatically select multiple source devices using the signal from the central switching section, and also to send the signal for the selection to the display section. Since the signal is obtained from the signal, only one signal line is required for each source device, and the circuit can be simplified. Moreover, with the simplification of the circuit, there is no need for complex control, and arithmetic elements and the like can be saved, leading to significant cost reductions.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the audio system according to the present invention, FIG. 1 is an overall block diagram, FIG. 2 is a specific circuit configuration diagram, and FIG. 3 is a block diagram showing a conventional audio system. It is a diagram. 1... Entire audio system, 2... Central switching section, 3... Selection control circuit, 4... Display section, P...
…Power amplifier, K ₁ ~K _o …Source device, C ₁ ~
C _o ... Signal line, M ₁ ~ _{M o} ... Display specified signal.

Claims (1)

[Scope of utility model registration request] In an audio system capable of amplifying a signal from a desired source device among a plurality of source devices, the audio system includes a central switching section and a display section that displays a display corresponding to the switching state of the central switching section. and a selection control circuit connected between the central switching section and the display section, the selection control circuit outputting a source designation signal from the central switching section to each of the source devices and the display section, An audio system characterized in that each of the source devices is configured to be controlled to start or stop playing by a control signal from a single signal line, depending on whether a corresponding display is turned on or off.