JPH0831223B2 - Electronic device and mode processing circuit of electronic device - Google Patents

Description

The present invention relates to an electronic device and a mode processing circuit of the electronic device.

[Outline of Invention]

The present invention provides a transition vector table in an electronic device that causes a mode transition by an external input command, and executes the mode transition in accordance with this transition vector table, so that the processing time of the input command is significantly shortened. It is the one.

[Conventional technology]

The VTR has various operation modes such as a play mode and a rewind mode, but when changing these operation modes, it is necessary to switch the mechanism such as turning on / off of a brake or a pinch roller.

When this mechanism is switched, it can be switched almost instantly by using a plunger.However, when a plunger is used, a considerably large current flows at the time of startup, and moreover, it is necessary to keep the current flowing during steady state. Therefore, the power supply circuit becomes large and the power consumption becomes large.

Therefore, it is considered to use a motor instead of the plunger. That is, if a motor is used, by using a gear together, it is possible to obtain a driving force required for switching the mechanism even with a small motor, reduce power consumption, and reduce the size of the power supply circuit. Can be converted.

However, when switching the mechanism using the motor in this way, it takes time to switch (switch) the mode. For example, from the stop mode to the playback mode, it takes about 2 seconds from the playback mode to the stop mode. 1.5 seconds It takes about 1.8 seconds from stop mode to recording mode.

Therefore, when pressing the first operation key and then the second operation key, the operation of the second operation key must be waited until the mode transition by the first operation key is completed.

However, this is very inconvenient to use, so a method of stacking the input of operation keys has been considered.

For example, as shown in FIG. 6, the time t ₁ earlier VTR is in stop mode, and pressing the recording key at time t _1. Then, the VTR (mechanism) mode is set at the time t.
Transition from ₁ to recording mode.

If, for example, the stop key is pressed at time t ₂ during this transition, this stop key is valid for the recording mode, which is the mode after the transition, so it is necessary to enter the stop mode after the transition. Memorized in.

Then, when the transition ends at the time point t ₃ , the VTR enters the recording mode. At this time, the stop mode instruction stored at the time point t ₂ is taken out from the mode stack, and this is put into execution.

Therefore, the VTR transits to the stop mode from the time point t ₃ and enters the stop mode from the time point t ₄ . It should be noted that even if the pause key is pressed at the time point t ₅ in the stop mode, this is not executed because the pause mode has no meaning in the stop mode.

Therefore, according to this stack method, it is possible to eliminate the operational trouble that the next operation key must not be pressed (it is ignored even if it is pressed) until the mode transition of the VTR is completed.

[Problems to be solved by the invention]

However, in the stack method described above, for example, as shown in FIG. 7, after pressing the stop key at time t ₂ ,
Press pause key to t _a, since the pause key is valid for recording mode is a mode after the transition, (by pressing the pause key when the recording mode, the recording pause mode), the mode stored in the mode stack Will be updated from stop mode to recording pause mode.

Therefore, from the point in time t ₃ VTR we continue to transition to the recording pause mode, and from the time t ₄ and the recording pause mode.

However, this is an operation mode different from the case of FIG. 6 even if the operation order of the stop key and the pause key is the same.

That is, if you press more than one valid operation key during a mode transition, the mode stored in the mode stack is updated to the mode of the last operation key pressed, and all previously pressed keys are ignored. I will end up. Therefore, the operation mode is changed to a different operation mode depending on the timing of pressing the operation key (whether during the mode change or after the change).

Therefore, in such a stack method, it is also considered that the mode stack has a multi-stage configuration, the input modes are sequentially stacked, and these are sequentially executed.

However, in this multi-stage stack method, it is necessary to perform garbage collection on the mode stack to remove meaningless modes in the mode stack.
The program of the microcomputer for mode control becomes complicated and takes time. Especially when processing an 8-bit mode with a CPU that has only 4-pit comparison instructions. Also, the RAM needs an area for mode stack.

The present invention is intended to solve the above problems.

[Means for solving problems]

Therefore, in the present invention, a transition vector table is provided and mode transition is performed according to this transition vector table.

[Action]

Transition to the target mode with the minimum number of mode transitions.

〔Example〕

Figure 1 shows the hardware related to VTR mode transition. (1) is the mechanism control part, which is the loading motor (11) for loading and unloading the tape, and the VTR (mechanism) mode. And a servo circuit (13) for controlling the drum and capstan.

Further, (2) is a mode controller composed of a microcomputer, the output of which is supplied to the control unit (1) to set each operation mode, and the control unit (1) indicates its state (mode). The signal is supplied to the controller (2).

Further, (3) is a key input means having respective operation keys, and (4) is a receiving circuit for receiving an operation key signal from the remote controller when operating the VTR by remote control. These circuits (3) ，
The key input signal from (4) is supplied to the controller (2). Further, (5) is a mode display means, which displays the VTR mode by the output of the controller (2).

Further, for example, a mode transition table and a transition vector table as shown in FIGS. 3 and 4 are provided in the ROM of the microcomputer constituting the controller (2).

Then, when the operation key of the input means (3) or the operation key of the controller of the remote controller is pressed, this is processed by the controller (2), and the processing result is supplied to the control unit (1) so that a predetermined operation mode is set. Control unit (1)
Is controlled and the mode is displayed by the display means (5).

FIG. 2 shows an example of mode transition for the key input of the operation key.

In the following description, the current mode is the VTR (mechanism) mode at that time, and the transition destination mode during the transition.

Final mode ... It is the last mode stored in the controller (2) at that time, and whether the pressed operation key is valid depends on whether it is valid for this final mode.
Further, the final mode is displayed on the display means (5).

Is. An area for storing the current mode and the final mode is provided in the RAM of the microcomputer forming the controller (2).

That is, in this example, since the VTR is in the stop mode before the time point t ₁ , the current mode is, of course, the stop mode, and the final mode and the display are also in the stop mode.

Then, when the play key is pressed at the time point t ₁ , the mode transition table shown in FIG. 3 is referred to. This table shows, when the operation key is pressed, whether the key input is valid or invalid for the final mode at that time, and if so, which mode should be transitioned to. Is. Then, at the time point t ₁ , the final mode is the stop mode, and since the reproduction key is key-in, the table shows that the reproduction mode should be set.

Therefore, from the time point t ₁ , the final mode and the display are set to the reproduction mode. Further, the VTR (mechanism) starts the transition from the stop mode to the playback mode, and the current mode is also set to the playback mode.

Then, when the stop key is pressed at time t ₂ during this transition, the mode transition table is referred to, which indicates that the mode should be transited to the stop mode, so that the final mode and the display are the stop mode. To be done. However, the VTR itself continues the transition to the reproduction mode (current mode) by the key input at the time point t ₁ .

Furthermore, pressing the recording key to the time point t ₃ in this transition, reference is mode transition table, according to this, since it has been shown that should transition to the recording mode, the final mode and display and recording mode To be done. However, the VTR itself continues the transition to the final mode by the key input at the time point t ₁ .

Then, at the time point t ₄ , when the transition to the reproduction mode by the key input at the time point t ₁ is completed, the transition vector table of FIG. 4 is referred to. This table shows whether the VTR should make a further mode transition from the current mode and the final mode at that time, and which mode should be transited when the mode transition should be made. In this case (time point t ₄ ), it is indicated that the current mode is the reproduction mode and the final mode is the recording mode, so that the reproduction pause mode should be further performed. Therefore, the VTR is
The transition to the playback pause mode is started from the time point t ₄ , and the current mode is also changed to the playback pause mode.

When the transition to the playback pause mode ends at time t ₅ , the transition vector table is referred to again. In this case, the current mode is the playback pause mode and the final mode is the recording mode. It has been shown that it should become. Therefore, the VTR starts the transition to the recording pause mode from the time point t ₅ , and the current mode is also set to the recording pause mode.

Furthermore, when the transition to the recording pause mode ends at time t ₆ , the transition vector table is referred to again. In this case, the current mode is the recording pause mode and the final mode is the recording mode. It has been shown to be. Accordingly, VTR starts transition from time t ₆ to the recording mode, current mode is the recording mode.

Then, when the transition to this recording mode is completed at time t ₇ , the transition vector table is referred to. In this case, since the current mode and the final mode are the same in the recording mode, no further mode transition is performed. Therefore, after the time point t ₇ , the VTR remains in the recording mode.

The above is one example of the mode transition, and when this is shown by a general algorithm, it is as shown in FIG.

That is, this algorithm is also a flow chart of a program executed by the microcomputer that constitutes the mode controller (2). Then, in step (21), it is checked whether or not there is a key input by the operation key, and when there is a key input, the processing of the microcomputer (controller (2)) proceeds from step (21) to step (22), and this step ( In 22), it is checked according to the mode transition table whether the key input checked in step (21) is valid or invalid for the final mode.

When it is determined in step (22) that the key input is valid, the process proceeds from step (22) to step (23), and according to the mode transition table, for example, at time t _{1 in} FIG.
The final mode and display are updated as shown in.

Then, the process proceeds from step (23) to step (31). Further, when there is no key input in step (21) and when it is determined that the key input is invalid in step (22), the process proceeds from step (21), (22) to step (31).

Then, in this step (31), it is checked whether the mode transition of the mechanism (VTR) is in transition or completed, and when it is in transition, the process returns from step (31) to step (21).

Therefore, during the period t ₁ ~t ₄ in FIG. 2, step (21) to (23), thus it is repeated (31).

However, when it is determined in step (31) that the transition of the mechanism has ended, the process proceeds from step (31) to step (32), and this step (32)
Is checked whether the current mode and the final mode are equal, and if they are not equal, the process proceeds from step (32) to step (33), and this step (33)
In, the transition vector table is referenced to determine a new transition destination, and the current mode is updated to the new transition destination.

Then, the process proceeds from step (33) to step (34), in which the transition to the current mode updated by step (33) is started, and then the process proceeds to step (21). Return.

Therefore, the processes of steps (31) to (34) are performed at the times t ₄ , t ₅ , and t ₆ in FIG.

When it is determined in step (32) that the current mode and the final mode are the same, the process returns from step (32) to step (21).

Thus, the time point t _7, so that this process is being performed.

Thus, according to the above processing routine, for example, the second
The modes change as shown in the figure.

The key input check in step (22) can also be executed by a condition judgment command without using the mode transition table. Furthermore, in the above, although it is the case of VTR, it is a tape deck, a video disc player, a CD.
The present invention can be applied to any electronic device such as a player that requires time to change modes.

〔The invention's effect〕

According to the present invention, no matter how many operation keys are pressed, the mode to be changed is optimized by the transition vector table, so that the mode at the time of pressing the operation key can be changed to the target mode with the minimum number of transitions.

In addition, operation key reception and mode display are executed immediately if the key input is valid, and mode transitions are performed at the minimum number of times, so the user does not feel the delay of transition, Apparently, the transition time can be eliminated.

Furthermore, since the garbage collection is unnecessary, the controller (2) can be programmed easily and in a short time. Also, the stack area is unnecessary.

Furthermore, the final mode is the same no matter what timing the operation key is pressed.

[Brief description of drawings]

FIG. 1 is a system diagram of an example of the present invention, and FIGS. 2 to 7 are diagrams for explaining the same. (1) is a mechanism controller, (2) is a mode controller, (3) is a key input means, and (5) is a mode display means.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Koji Iwamoto 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Kenichi Ito 6-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (2)

[Claims] 1. A first storage means for storing a final operation mode, a second storage means for storing a transition vector table showing a transition destination of the operation mode, and the above-mentioned inputting during the actual transition of the operation mode. Whether or not the command is valid is judged, and when it is valid, it is stored in the storage means as the final operation mode, and a new transition destination is referred from the final operation mode and the operation mode after transition by referring to the transition vector table. An electronic device having a mode processing circuit having a mode control means for determining the operation mode of, and performing the transition of the operation mode until the final operation mode and the operation mode after the transition become equal. 2. A first storage means for storing a final operation mode, a second storage means for storing a transition vector table showing a transition destination of the operation mode, and the above-mentioned input input during the actual transition of the operation mode. Whether or not the command is valid is judged, and when it is valid, it is stored in the storage means as the final operation mode, and a new transition destination is referred from the final operation mode and the operation mode after transition by referring to the transition vector table. And a mode control means for determining the operation mode of the electronic device, wherein the operation mode transition is performed until the final operation mode and the operation mode after the transition become equal.