JPH0851676A - Control circuit - Google Patents

Abstract

PURPOSE:To securely perform specific control operation by the control input of a desired system among plural systems. CONSTITUTION:The system controller 6 of an LD player 1 detects a voltage input of 5V from a control signal input terminal C-IN to detect whether or not a control signal line 22 is connected and switches a changeover switch 4 to the side of the control signal input terminal C-IN when the voltage input of 5V can be detected, thereby performing playback control and stop control over an LD playback part 5 on the basis of the control signal inputted from an AV amplifier 10. The changeover switch 4 is switched to the side of a remote control reception part 3 unless the voltage input of 5V from the control signal input terminal C-IN can be detected to perform play back control and stop control over the LD playback part 5 with the remote control signal inputted from the remote control part 3 through the operation of a remote control operation unit 3 attached to the LD player 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit, and more particularly to a control circuit which performs a predetermined control operation based on a control input of one system selected from a plurality of systems.

[0002]

2. Description of the Related Art Preparing a plurality of LD players,
One LD player arbitrarily selected from the above plays the video signal and the music signal, outputs the video signal to the monitor TV to display the video, and outputs the music signal to the speaker after power amplification to reproduce the sound. If you want, AV of multiple systems
It is convenient to use an AV amplifier that has a source input terminal and can switch sources. Each LD player is equipped with a remote control receiver that receives a transmission signal from the attached remote controller, demodulates the remote control signal, and outputs the demodulated remote controller signal to the control unit of the microcomputer configuration. Can be operated by remote control.
On the other hand, the AV amplifier also has a remote control receiver that receives a transmission signal from the attached remote controller, demodulates the remote control signal, and outputs the demodulated remote control signal to the control unit of the microcomputer configuration.
The remote control unit allows remote control operations such as source switching.

However, if the remote control operation device attached to each LD player and the remote control operation device attached to the AV amplifier are individually used for remote control operation, the holding of the remote control operation device is troublesome and erroneous operation is likely to occur. Therefore, the AV amplifier is provided with the control function of the LD player, and
By sending a control signal from the amplifier to each LD player, it is possible to perform remote control operations such as LD playback and stop for the currently selected LD player using the remote control operation unit attached to the AV amplifier. , LD players have been put to practical use.

A system compatible LD player has a control signal input terminal to which a control signal from a system compatible AV amplifier can be input in addition to a remote control receiver. Since it is highly likely that an erroneous operation will occur if both the remote control operation by the remote control operation unit attached to the LD player and the control by the system compatible AV amplifier are effective, the output of the remote control receiver and the input from the control signal input terminal A switch for switching the output to the system controller (analog switch, etc.) is provided. When connected to a system compatible AV amplifier by a control signal line, the selector switch is switched to the control signal input terminal side, and the system compatible AV amplifier When the control signal line is not connected, the changeover switch is switched to the remote control receiver side, and only the operation of the attached remote controller is enabled.

[0005]

The changeover of the changeover switch in the conventional LD player compatible with the system is as follows.
When a control signal line is connected to the control signal input terminal, a mechanical switch that closes the mechanical contact and outputs a connection detection signal is provided, and when the connection detection signal is input from the mechanical switch, the control unit switches the changeover switch. This is done by switching to the control signal input terminal side, and when the connection detection signal is not input, the control section switches the selector switch to the remote control receiving section side. For this reason, when the control signal line is repeatedly attached and detached, the springiness of the mechanical switch becomes weak, which causes the contact to open and close improperly. Or, there was a fear that only the control by the AV amplifier would be effective. The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a control circuit capable of surely performing a predetermined control operation by a control input of a desired system among a plurality of systems.

[0006]

According to one aspect of the present invention, a first
And a switching means for selecting and outputting one system from among the control signal input of 1 and a plurality of second control signal inputs inputted from one or a plurality of second control signal input terminals. In a control circuit that performs a predetermined control operation based on the first control signal or the second control signal input via a voltage detection means for detecting the presence or absence of voltage input from each second control signal input terminal. And based on the detection result of the voltage detection means, when the system having the voltage input from the second control signal input terminal is detected, the switching means is switched to the side of the system, and each second control signal input terminal And a switching control means for switching the switching means to the side of the first control signal when a system with a voltage input from is not detected.

According to another aspect of the present invention, there is provided switching means for selecting and outputting one system from a plurality of systems of control signal inputs inputted from a plurality of control signal input terminals, and through the switching means. In a control circuit that performs a predetermined control operation based on an input control signal, a voltage detection unit that detects the presence or absence of voltage input from each control signal input terminal, and a system with voltage input based on the detection result of the voltage detection unit It is characterized in that it is provided with a switching control means for switching the switching means.

[0008]

According to one aspect of the present invention, when a system having a voltage input from each of the second control signal input terminals of one or a plurality of systems is detected, the switching means is switched to the side of the system. When the system with the voltage input from the second control signal input terminal is not detected, the switching means is switched to the side of the first control signal. As a result, it is possible to eliminate the need for a mechanical switch that is prone to failure, improve the reliability of the control input switching operation, and eliminate the possibility that the switching means will switch to the wrong system, and the first control signal input and one or more systems. Among the second control signal inputs, the desired control operation can be reliably performed by the control input of the desired system.

According to another aspect of the present invention, the presence or absence of voltage input from each control signal input terminal of a plurality of systems is detected, and the switching means is switched to the side of the system having a voltage input based on the detection result. Let This eliminates the need for mechanical switches and improves the reliability of control input switching operations.
There is no fear that the switching means will switch to the wrong system, and it is possible to reliably perform the predetermined control operation by the control input of the desired system among the control signal inputs of the plurality of systems.

[0010]

1 is a circuit diagram of an AV system according to an embodiment of the present invention. 1 is an LD player compatible with the system, which receives a transmission signal from an attached remote controller 2
By switching the remote control receiver 3 for demodulating and outputting the remote control signal as the first control signal, the output of the remote controller receiver 3 and the control signal as the second control signal input from the control signal input terminal C-IN. It is composed of a changeover switch 4 composed of an analog switch for outputting, and a microcomputer for performing a predetermined control operation such as LD reproduction control and stop control for the LD reproduction section 5 based on a remote control signal or a control signal inputted through the changeover switch 4. System controller 6, the video output terminal V-OUT and the audio output terminal A- for outputting the video signal and the music signal reproduced and output by the LD reproducing section 5 during the LD reproduction.
Has OUT.

The system controller 6 detects the presence / absence of a voltage input from the control signal input terminal C-IN, and based on the detection result, when there is a voltage input, the changeover switch 4
Is switched to the side of the control signal input terminal C-IN, and if there is no voltage input, switching control to switch to the side of the remote control receiver 3 is also performed.

Reference numeral 10 is a system-compatible AV amplifier,
A remote control receiver 13 that receives a transmission signal from a key input unit 11 and an attached remote controller 12 and demodulates and outputs the remote controller signal. Two first and second videos connectable to two system compatible LD players. Input terminals V-IN ₁ , V-IN ₂ , first and second audio input terminals A-IN ₁ , A-IN ₂ , first and second control signal output terminals C-OUT, C-OUT, audio source switching Selector switch 14, selector switch 15 for video source selection, key input unit 1
1 or the first and second control signals in response to operations such as reproduction and stop on the LD player, based on the input from the remote control receiver 13 to perform source switching control on the selector switches 14 and 15 according to the source switching operation. The system controller 16 is composed of a microcomputer that outputs a control signal to the system whose source is currently selected among the output terminals C-OUT and C-OUT.

Video output terminal V-OUT of the LD player 1,
Audio output terminal A-OUT, control signal input terminal
C-IN is the first video input terminal V-IN ₁ of the AV amplifier 10, the audio input terminal A-IN ₁ , the control signal output terminal C-
OUT and video signal line 20, audio signal line 21,
It is connected by a control signal line 22.

As shown in FIG. 2, the remote control receivers 3 and 13 output a constant 5V when the transmission signals are not received from the corresponding remote control operators 2 and 12, and receive the transmission signals including the remote control signals. Then, a remote control signal that repeatedly changes between 5V and 0V is output for 58.5 to 76.5 ms. The remote control signal has a reader part that determines the code reading timing and a custom code (maker code)
And the command code are combined, and the command code indicates the actual control content. The control signal output from the AV amplifier 10 has exactly the same format as the remote control signal, and is a constant 5 V when the key input unit 11 or the remote controller 12 is not operated. When the operation device 12 is operated, it repeatedly changes between 5V and 0V for 58.5 to 76.5 ms and transmits a command code and the like.

FIG. 3 and FIG. 4 show the system controller of the LD player 1.
9 is a flowchart showing the operation of the controller 6,
The operation of the above embodiment will be described below with reference to these drawings.
To do. When connecting the control signal line The system controller 6 periodically performs the interrupt processing of FIG.
Is running. In this interrupt processing, first of all 100 ms
Check if the timer that keeps time is running, and initially set it to NO.
Therefore, start the timer (steps 40 and 4 in FIG. 4).
1). Input from the control signal input terminal C-IN
It is checked whether the applied voltage is 5V (step 42). Con
The troll signal line 22 is connected and the AV signal
Assuming that the power supply of the power supply of the amplifier 10 is on
When 0, the key input unit 11 or the remote controller 12 is operated.
Input to the control signal input terminal C-IN when not
Since the control signal generated is 5V,
If YES in step 42, the changeover switch 4 is turned on.
Switch to the Troll signal input terminal C-IN side (Step 4
3) Stop the timer (step 44).

If the LD player 1 is operated by the key input unit 11 or the remote controller 12 of the AV amplifier 10 when the check in step 42 is performed, it is 0V as shown by an arrow A in FIG. When
It is checked whether the timer has completed the time measurement of 100 ms (step 45), and if not, do nothing. However, the timer will be operating in the next interrupt process (step 4
(YES at 0) Immediately check if the voltage input from the control signal input terminal C-IN is 5V (step 4).
2). If YES, the selector switch 4 is switched to the control signal input terminal C-IN side to stop the timer (steps 43 and 44). If NO, the timer is set to 100 m.
It is checked whether the timing of s has been completed (step 45), and if nothing has been done, nothing is done. As shown in Fig.2, the control signal returns to 5V constant in 76.5ms at maximum, so the control signal is 5V before the timer measures 100ms.
When the voltage V is detected, the changeover switch 4 is changed over to the control signal input terminal C-IN side.

In this case, the system controller 6 is shown in FIG.
According to the main flow of
When a command code is input from the V amplifier 10 side, reproduction control and stop control for the LD reproduction section 5 are performed according to the command code (steps 30 and 3 in FIG. 3).
1).

When the control signal line 22 is not connected when the control signal line is not connected, the control signal input terminal C-IN remains at 0V. Therefore,
In the interrupt processing of FIG. 4, the system controller 6 only repeats the judgment of NO at step 42 after the timer is started and until the time measurement of 100 ms is completed. In this case, when the timer has finished measuring the time of 100 ms, the system controller 6 switches the changeover switch 4 to the remote control receiver 3 side and stops the timer (steps 45, 46, 44). In this case, when the system controller 6 operates the remote controller 2 to input a command code from the remote controller receiver 3 side via the changeover switch 4 according to the main flow of FIG. 3, LD reproduction is performed according to the command code. Reproduction control, stop control, etc. for the unit 5 will be performed (steps 30, 3 in FIG. 3).
1).

According to this embodiment, the system controller 6 detects the presence / absence of a voltage input (here, 5V) from the control signal input terminal C-IN, and when the voltage input can be detected, the changeover switch 4 is input with the control signal. Terminal
Since it is switched to the C-IN side and switched to the remote control receiving section 3 side when the voltage input cannot be detected, it is electrically checked whether the control signal line 22 is connected and the control signal input is made. A mechanical switch for detecting whether or not the control signal line 22 is connected can be eliminated. Therefore, the reliability of the switching operation between the remote control signal input and the control signal input can be improved, there is no fear that the changeover switch 4 will be switched to the wrong system, and the system controller 6 can control the remote control receiver 3 and the control signal input terminal C-IN. Among them, a predetermined control operation can be surely performed by inputting a command from a desired system. Further, since it is not necessary to add a special circuit for detecting the control signal voltage, it is possible to reduce the cost by eliminating the need for the mechanical switch.

In the above-described embodiment, the LD player inputs the control signal as the second control signal for only one system, but it is possible to connect to a plurality of system compatible AV amplifiers. A plurality of control signal input terminals for inputting the control signal as the second control signal are provided, and one of the output of the remote control receiver and the control signal input of a plurality of systems is selected by the changeover switch to the system controller. If you want to input, you can deal with it as follows. That is, of the plurality of AV amplifiers, the control signal line other than the one desired to operate is disconnected from the control signal input terminal of the LD player, or the plurality of AV amplifiers and LD amplifiers are individually controlled by the control signal line. All of them are connected, and the power of only one AV amplifier desired to operate is turned on, and the power of the other AV amplifiers is turned off. And LD
In the player, the system controller detects whether there is a voltage input from each control signal input terminal, and
When a voltage input of 5V is detected for each control signal input terminal, the changeover switch is switched to a system having the voltage input, and when no voltage input of 5V is detected for any of the control signal input terminals, the remote controller receiver Switch to the output side.

Further, in the above embodiment, the first control signal is the remote control signal output from the remote control receiving section, but it may be another type of control signal such as a key code signal input from the key input section. .

FIG. 5 is a partially omitted circuit diagram of an LD player according to a modification of the present invention. In this LD player, there is no remote control receiver, but there are three systems of first to third control signal input terminals C-IN. _{1 to} C-IN ₃ are selected, one of which is selected by the changeover switch 4A and input to the system controller 6A configured by a microcomputer. In the changeover switch 4A, the system controller 6A has first to third control signal input terminals C-IN _{1 to} C-.
Switching control is performed based on the detection result of the presence or absence of voltage input from IN ₃ .

FIG. 6 is a flow chart showing the interrupt processing of the system controller 6A, and the operation of the above-described modification will be described with reference to this figure. The main processing performed by the system controller 6A is the same as in FIG. The first to third control signal input terminals C-IN _{1 to} C-IN
_Three AV amplifiers are individually connected to 3, but 1
It is assumed that only one power source is turned on. Further, i indicating the current detection target of the voltage input is assumed to be 1 in advance. The system controller 6A first checks whether the timer for measuring 100 ms is in operation. Since it is initially NO, the timer is started (steps 50, 5 in FIG. 6).
1). Then, it is checked whether there is a voltage input of 5V from the first control signal input terminal C-IN ₁ (step 5
2). When the power of the AV amplifier connected to the first control signal input terminal C-IN ₁ is turned on and no operation is performed on this AV amplifier side, the signal from the first control signal input terminal C-IN ₁ Since the voltage input is 5V, the changeover switch 4A is changed over to the side of the first control signal input terminal C-IN ₁ (step 53), and the timer is stopped (step 54).

If the LD player happens to be operated on the LD player on the side of the AV amplifier when the check in step 52 is performed, when the voltage is 0 V as shown by the arrow A in FIG. 2, the timer completes the timing of 100 ms. Check whether it has been done (step 55), and if nothing has been done, do nothing. However,
In the next interrupt processing, the timer is operating (YES in step 50), so it is immediately checked whether or not there is a voltage input of 5V from the first control signal input terminal C-IN ₁ (step 52). If YES, the selector switch 4A is switched to the side of the first control signal input terminal C-IN ₁ to stop the timer (steps 53 and 54). If NO, it is checked whether the timer has finished counting 100 ms. (Step 55), if not done, do nothing. As shown in Fig. 2, the first control signal returns to a constant 5V in 76.5ms at maximum, so there must be a voltage input of 5V from the first control signal input terminal C-IN ₁ before the timer measures 100ms. Is detected, the changeover switch 4A is changed over to the side of the first control signal input terminal C-IN ₁ .

In this case, when the system controller 6A inputs a command code from the side of the AV amplifier in the power-on state via the changeover switch 4A according to the main flow of FIG. 3, the system controller 6A performs a predetermined control according to the command code.

If the AV amplifier connected to the first and third control signal input terminals C-IN ₁ and C-IN ₃ is off, it is connected to the second control signal input terminal C-IN ₂ . When the power supply of the AV amplifier is turned on, it remains NO even if it is repeatedly checked for 100 ms whether there is a voltage input of 5 V from the first control signal input terminal C-IN ₁ . In this case, the system controller 6A sets i to 2 and stops the timer when the timer has finished measuring 100 ms (steps 55, 56, 54). Therefore,
During the next 100 ms, the second control signal input terminal C-IN
_Since it is checked whether there is a voltage input of ₂ to 5V, and it is detected that there is a voltage input of 5V at any time, the changeover switch 4A changes the second control signal input terminal C-IN ₂ To the side (steps 52 and 53).

A connected to the third control signal input terminal C-IN ₃ instead of the second control signal input terminal C-IN ₂
When only the V amplifier is powered on, it remains NO even if it is repeatedly checked for 100 ms whether there is a voltage input of 5 V from the second control signal input terminal C-IN ₂ In this case, the system controller 6A sets i to 3 and stops the timer when the timer finishes measuring 100 ms (steps 55, 56, 54). Therefore, during the next 100 ms, the third control signal input terminal C-IN ₃
Therefore, it is checked whether or not there is a voltage input of 5V, and it is detected that there is a voltage input of 5V at any time. Therefore, the changeover switch 4A switches the third control signal input terminal C-IN ₃ to To the side (steps 52 and 53).

According to this modification, the LD player does not have a remote control receiver, and the first to third control signal input terminals C-IN enable connection with three AV amplifiers.
Even if the system controller 6 has _{1 to} C-IN ₃ and one system of control signals selected by the changeover of the changeover switch 4A is input, each of the first to third control signal input terminals C-IN ₁ ~ By detecting the presence or absence of voltage input from C-IN ₃ and switching the switch 4A to the system that was able to detect the voltage input, the system with the control signal input can be electrically detected and the control signal line A mechanical switch for detecting the presence or absence of connection can be eliminated. Therefore, the reliability of the switching operation of the first to third control signal inputs can be improved, and there is no fear that the changeover switch 4A will be switched to the wrong system.
System controller 6A can be first to third of the control signal input terminal _{C-IN 1 ~C-IN 3} , reliably perform predetermined control operation by a command input from a desired lineage. Also, because it is not necessary to add a special circuit to detect the control signal voltage, the cost can be reduced and space can be saved by eliminating the need for mechanical switches, and the number of control signal input systems can be increased. Can be easily increased. Further, even if the three AV signal amplifiers and the LD player are still connected by the three control signal lines, the power of the AV signal amplifier, which is desired to operate, is turned on, and the other A
Since the LD player can be controlled by the desired AV amplifier simply by turning off the power source of the V amplifier, it is possible to save the labor of attaching and detaching the control signal line each time the AV amplifier desired to operate is replaced.

Although the LD player is taken as an example in the above-mentioned embodiments and modifications, the present invention is not limited to this, and various AV source devices, computer-related devices, communication-related devices are included. , In a control circuit or the like built in various electric equipment such as machine control equipment, the output of the remote control receiving means and the control signal from the control signal input terminal of one or a plurality of systems are switched and input to perform a predetermined control operation. It is applicable to various control circuits or various control circuits that switch and input control signals from control signal input terminals of a plurality of systems to perform predetermined control operations.

[0030]

According to one aspect of the present invention, when a system having a voltage input from each second control signal input terminal of one or a plurality of systems is detected, the switching means is switched to the side of the system. Since the switching means is switched to the side of the first control signal when the system with the voltage input from each second control signal input terminal is not detected, the mechanical switch which is prone to failure is unnecessary. Therefore, the reliability of the switching operation of the control input is improved, there is no fear that the switching means will switch to the wrong system, and a desired control signal can be selected from the first control signal input and the second control signal input of one or more systems. It is possible to surely perform a predetermined control operation by the system control input.

According to another aspect of the present invention, the presence or absence of voltage input from each control signal input terminal of a plurality of systems is detected, and the switching means is switched to the system side having the voltage input based on the detection result. As a result, the mechanical switch can be made unnecessary, the reliability of the control input switching operation is improved, there is no fear that the switching means will switch to the wrong system, and the control signal input of multiple systems It is possible to surely perform a predetermined control operation by the system control input.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an AV system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an output waveform of a remote control receiver.

FIG. 3 is a flowchart showing an operation of a system controller of the LD player.

FIG. 4 is a flowchart showing an operation of a system controller of the LD player.

FIG. 5 is a partially omitted circuit diagram of an LD player according to a modified example of the present invention.

FIG. 6 is a flowchart showing the operation of the system controller in FIG.

[Explanation of symbols]

1 LD player 2, 12 Remote control operation device 3, 13 Remote control receiving unit 4, 4A changeover switch 5 LD reproducing unit 6, 6A, 16 System controller 10 AV amplifier C-IN control signal input terminal C-IN ₁ First control signal input Terminal C-IN ₂ 2nd control signal input terminal C-IN ₃ 3rd control signal input terminal

Claims (2)

[Claims] 1. A switch for selecting and outputting one system from among a first control signal input and one or a plurality of systems of second control signal inputs inputted from one or a plurality of second control signal input terminals. In a control circuit having a means for performing a predetermined control operation based on the first control signal or the second control signal input through the switching means, the presence or absence of voltage input from each second control signal input terminal is checked. Based on the voltage detecting means for detecting and the detection result of the voltage detecting means, when a system having a voltage input is detected from the second control signal input terminal, the switching means is switched to the side of the system, and each second A control circuit comprising: switching control means for switching the switching means to the side of the first control signal when a system having a voltage input from the control signal input terminal is not detected. 2. A switching means for selecting and outputting one system from a plurality of systems of control signal inputs inputted from a plurality of control signal input terminals, and predetermined based on a control signal inputted through the switching means. In the control circuit that performs the control operation of, the voltage detection means that detects the presence or absence of voltage input from each control signal input terminal, and the switching control that switches the switching means to the system with voltage input based on the detection result of the voltage detection means. A control circuit comprising means and.