JP3239108B2 - Module selection control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device having a plurality of device modules, and more particularly to a device for selectively controlling these device modules.

[0002]

2. Description of the Related Art As shown in FIG. 3, for example, a synthesizer module (2) controlled by a microcomputer (1), an electronic volume (3), an MD (mini-disc) player module (4), a CD (compact disc) Audio equipment in which a plurality of device modules such as a player module (5) and a liquid crystal display module (6) are built in a common cabinet and integrated is widely used.

In this type of electronic equipment, control of each equipment module by a microcomputer is performed by a control signal composed of data and a clock and a module selection signal for selecting one equipment module to be controlled. . Here, as a connection method between the microcomputer and a plurality of device modules, the microcomputer is provided with a data terminal, a clock terminal, and a module selection terminal for each device module,
Data line, clock line, and module selection signal line 3
There is a method of connecting a microcomputer and each device module individually using wires, but in this case, not only the number of ports of the microcomputer is increased, but also the control circuit of the microcomputer and a plurality of device modules are separately provided. When they are arranged on a substrate, there is a problem that the number of connections between the substrate of the microcomputer and the substrate of another device module increases.

Therefore, as shown in FIG. 3, a microcomputer (1) has a data terminal DA common to equipment modules.
TA and a clock terminal CLK are provided, and these terminals are
A plurality of modules connected to each device module via control signal lines L2 and L3 branched into a plurality of branch lines and outputting a module selection signal indicating that each of the plurality of device modules has been selected as a control target. Select terminals TU_CS, VOL_CS, MD_CS,
By providing a CD_CS and an LCD_CS and connecting each module selection terminal to a corresponding device module, the number of ports of the microcomputer and the number of connections are reduced. In this connection state, when a control signal is output from the data terminal DATA and the clock terminal CLK of the microcomputer (1), the same control signal is output to each device module. More specifically, a control signal output from the microcomputer (1) is stored in a buffer (not shown) in each device module. Then, the microcomputer (1) gives a module selection signal from the module selection terminal only to the equipment module to be actually controlled. The device module to which the module selection signal has been applied captures the control signal stored in the buffer and performs processing of other circuits inside the device. In addition, since the control signal stored in the buffer is not taken in the device module to which the module selection signal is not given, the control signal is substantially ignored. In the module selection control device of FIG. 3, the microcomputer (1) is provided with an output terminal TU_MUTE for a mute signal,
When (2) is the control target, a mute signal is supplied from the microcomputer (1) to the synthesizer module (2), and the audio output level of the synthesizer module (2) is forcibly set to zero, It has been practiced to prevent the generation of noise sound due to the channel selection operation. Generally, a latch signal for taking in a data signal is used as a module selection signal.

[0005]

However, in the audio equipment equipped with the module selection control device shown in FIG. 3, while the radio broadcast is being received by the synthesizer module (2), the microcomputer (1) has a From a data terminal DATA and a clock terminal CLK to another device module, for example, an MD player module
When data and a clock for a recording operation are transmitted to (4), these control signals are also input to the synthesizer module (2). Here, the synthesizer module (2) is in a receiving operation, and there is a problem that unnecessary data and a clock input from the microcomputer (1) generate unnecessary radiation, thereby generating noise. This noise is received by the receiving circuit built in the synthesizer module (2), and the normal reception operation of the synthesizer module (2) is hindered.

An object of the present invention is to provide a module selection control device in which a control terminal is shared among a plurality of device modules, in which noise is not likely to occur during a reception operation of a tuner module. That is.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a simple module selection control device which utilizes a mute signal supplied from a microcomputer to a tuner module during a tuning operation of a tuner module. While maintaining the configuration, the generation of noise during the receiving operation of the tuner module was prevented.

In the module selection control signal according to the present invention, a plurality of equipment modules including a tuner module are connected to a control circuit, and the operation of each equipment module is controlled by the control circuit. Here, a control signal line for inputting a control signal to the tuner module is controlled to open and close according to an on / off state of a mute signal for silencing an output sound during a channel selection operation of the tuner module. With the interposition of the switch means, the switch means is opened during the reception operation of the tuner module.

In the above-described module selection control device of the present invention, when the tuner module is controlled by the control circuit, the mute signal is set to ON, and the switch means is closed in response to the mute signal. The control signal of the tuning operation command is input to the tuner module through the switch means. As a result, a tuning operation according to a command from the control circuit is performed. After the end of the channel selection operation, the mute signal is set to the off state, and the switch means is opened accordingly. Therefore, even if a control signal is transmitted from the control circuit to another device module during the reception operation of the tuner module, the control signal is interrupted by the open switch means and is not input to the tuner module. In this way, the input of unnecessary control signals to the tuner module during the receiving operation is prevented, so that there is no fear of generating noise.

In a specific configuration, the control circuit includes one mute terminal for outputting a mute signal and one or more control signals for outputting one or more control signals for controlling the operation of each device module. A terminal and a plurality of module selection terminals to output a module selection signal indicating that the module is selected as a control target are provided for each device module, the mute terminal is connected to a tuner module, and the control terminal has a plurality of control terminals. Connected to each device module via a control signal line branched into two branch lines,
The plurality of module selection terminals are connected to corresponding device modules. Further, a switch means which is controlled to open and close in accordance with the on / off state of the mute signal is interposed on a branch line of the control signal line connected to the tuner module, and the switch means is opened during the reception operation of the tuner module. It is. The control circuit is provided with a data output terminal and a clock output terminal as control terminals, and the command and the clock are supplied to each device module via individual control signal lines.

In the above specific configuration, when the user performs a tuning operation, a mute signal is set to ON by the control circuit, the mute signal is transmitted from the mute terminal to the tuner module, and the audio output of the tuner is in a silent state. Is set to Further, a control signal for a channel selection operation is created, and the control signal is transmitted to each device module via a branch signal line. Further, a module selection signal is output from a module selection terminal connected to the tuner module. At this time, the switch means is closed in accordance with the ON state of the mute signal, and since the module selection signal is output to the tuner module, the tuning operation in the tuner module is executed. When the reception frequency of the tuner module is tuned to a certain broadcast wave and the channel selection operation ends, the mute signal is set to off and the mute is released. At this time,
Since the switch means is opened according to the OFF state of the mute signal, even if a control signal is output from the control circuit to another device module, the control signal is not input to the tuner module.

In a further specific configuration, the switch means is supplied with the mute signal as an on / off control signal. When the mute signal is on, the switch means is closed, and when the mute signal is off, The switch means is opened. According to this specific configuration, since the mute signal itself is used as a control signal for opening / closing control of the switch means, there is no need to create an open / close control signal dedicated to the switch means, thereby simplifying the configuration of the control circuit. Becomes

[0013]

According to the module selection control device of the present invention, noise caused by controlling another device module during the reception operation of the tuner module does not occur.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an audio device will be specifically described below with reference to the drawings.
In the module selection control device according to the present invention, FIG.
As shown in the figure, a microcomputer (7) is connected to a synthesizer module (2), an electronic volume (3), an MD player module (4), a CD player module (5), and a liquid crystal display module (6). The microcomputer (7) controls these plurality of device modules. The microcomputer 7 is connected to a plurality of operation keys (not shown) for instructing each device module to perform various operations.

The microcomputer (7) has a mute terminal TU_MUTE for outputting a mute signal to the synthesizer module (2), a common data terminal DATA for outputting data to each device module, and a clock for each device module. Clock terminal C that outputs
LK and individual module selection terminals TU_CS, VOL_C for outputting a module selection signal to each device module
S, MD_CS, CD_CS, LCD_CS are provided. Mute terminal T of microcomputer (7)
U_MUTE is connected to the synthesizer module (2) via the signal line L1. Data terminal DATA
Is a signal line L branched into a plurality of branch lines L2_1 to L2_5.
2 are connected to the respective device modules (2) to (6). The clock terminal CLK has a plurality of branch lines L3_1 to L3_1.
It is connected to each of the device modules (2) to (6) via a signal line L3 branched to 3_5. Also, module selection terminals TU_CS, VOL_CS, MD_CS, CD_C
S and LCD_CS are connected to corresponding device modules (2) to (6) via signal lines L4 to L8, respectively.

An analog switch is provided on each of two branch lines L2_1 and L3_1 for inputting data and a clock supplied from a data terminal DATA and a clock terminal CLK of the microcomputer (7) to the synthesizer module (2). SW1 and SW2 intervene,
The switch means (8) to be opened and closed by a mute signal flowing through the signal line L1 is configured.

In the above-described module selection control device of the present invention, when the user performs a tuning operation, the microcomputer 7 sets the mute signal to ON as shown in FIG. The mute signal is supplied to a mute terminal TU_
The signal is output from the MUTE to the synthesizer module (2) and the switches SW1 and SW2. As a result, the audio output of the synthesizer module (2) is set to a silent state, and the switches SW1 and SW2 are closed as shown in FIG.

Thereafter, as shown in FIGS. 2 (b) and 2 (c), data and a clock for a channel selection command are output from a data terminal DATA and a clock terminal CLK of the microcomputer 7, respectively. At this time, since the switches SW1 and SW2 are closed, the data and clock output from the microcomputer (7) pass through the switches SW1 and SW2 and are input to the synthesizer module (2). Further, as shown in FIG. 2D, a module selection signal for the tuner module to take in data and clock is output from the module selection terminal TU-CS.
The tuning operation according to the command from (7) is performed. At this time, the data and the clock are also input to other device modules. However, since the module selection signal is not output to these device modules, the data and the clock input to the other device module are not output. Will be ignored.

When the tuning operation is completed by synchronizing the synthesizer module (2) with a certain broadcast wave, the microcomputer (7) turns off the mute signal as shown in FIG. 2 (a). The mute signal is output to the synthesizer module (2) and the switches SW1 and SW2. As a result, the mute of the synthesizer module (2) is released, and the switches SW1 and SW2 are
Opened as in (e).

In this state, when the user performs a certain operation on a device module other than the synthesizer module (2), for example, the electronic volume (3) as a control target,
Data and a clock for controlling the electronic volume (3) are output from the microcomputer (7), and the data and the clock are input to the electronic volume (3), so that the microcomputer and the microcomputer (7) respond to a command from the microcomputer (7). Volume adjustment is performed. Where the electronic volume
The data and clock for (3) are also output to the branch lines L2_1 and L3_1 connected to the synthesizer module (2), but these branch lines L2_1 and L3_
Since the switches SW1 and SW2 interposed in 1 are open, the data and the clock are not input to the synthesizer module (2).

As described above, in the module selection control apparatus according to the present invention, the data terminal DATA and the clock terminal CLK of the microcomputer (7) are supplied to each device module, thereby enabling the microcomputer to operate.
(7) The number of ports and the number of connections are reduced, and the switches SW1 and SW2 interposed between the signal lines L2 and L3 extending from the data terminal DATA and the clock terminal CLK are used to operate the synthesizer module (2) during the receiving operation. )
Unnecessary data and clock inputs are prevented, so that generation of noise can be reliably prevented. or,
Mute terminal TU_MUT of microcomputer (7)
Since the opening and closing of the switches SW1 and SW2 are controlled using E, it is not necessary to create a special control signal for controlling the opening and closing of these switches. A normal receiving operation of the module (2) can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a module selection control device according to the present invention.

FIG. 2 is a time chart showing an operation of the module selection control device.

FIG. 3 is a block diagram showing a configuration of a conventional module selection control device.

[Explanation of symbols]

 (7) Microcomputer (2) Synth tuner module (3) Electronic volume (4) MD player module (5) CD player module (6) Liquid crystal display module (8) Switch means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04B 1/20 G11B 31/00 527 H04B 1/10

Claims (4)

(57) [Claims] A control signal line for inputting a control signal to a tuner module in a module selection control device for connecting a plurality of device modules including a tuner module to a control circuit and controlling the operation of each device module. During the channel selection operation of the tuner module, there is interposed switch means that is opened and closed according to the on / off state of a mute signal for silencing the output sound, and the switch means is controlled during the reception operation of the tuner module. A module selection control device which is opened. 2. A module selection control device for connecting a plurality of equipment modules including a tuner module to a control circuit and controlling the operation of each equipment module, wherein the control circuit includes an output sound during a tuning operation of the tuner module. Should output a mute signal to silence
One mute terminal, one or more control terminals for outputting one or more control signals for controlling the operation of each device module, and a module selection signal indicating that the device is selected as a control target for each device module. A plurality of module selection terminals to be output to the mute terminal, the mute terminal is connected to a tuner module, the control terminal is via a control signal line branched into a plurality of branch lines,
Each of the plurality of module selection terminals is connected to a corresponding device module, and the control signal line connected to the tuner module is connected to a branch line of the control signal line in accordance with the on / off state of the mute signal. A module selection control device, characterized in that the switch means is opened during the reception operation of the tuner module, with a switch means controlled to open and close. 3. The switching means is supplied with the mute signal as an on / off control signal.
3. The module selection control device according to item 1. 4. The module selection control device according to claim 2, wherein the control circuit includes, as control terminals, a data output terminal and a clock output terminal.