JPH0580060B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/playback device, and in particular has a portable magnetic recording/playback device and a battery charging function, a power supply function, a tuner function, a recording reservation function, and a control function that can be connected to the portable magnetic recording/playback device. This relates to a device equipped with a tuner unit.

Conventionally, when a tuner unit is connected to a VTR and used as a system, the relationship between both interfaces in the control system and the input/output configuration are as shown in FIG.

In the figure, 1 is a VTR, 2 is a connector that connects the output from tuner unit 3 to VTR 1, and the output of tuner unit 3 is connected to VTR 1.
1, the switch 4 is mechanically linked and opened. 5 is a battery when using the VTR 1 as a portable type, 6 is a DC/DC converter that supplies voltage to each circuit of the VTR 1 when the power switch 7 is turned on, and 8 is a timer function and control inside the tuner unit 3. 9 is a system control microcomputer (system control means) that controls the VTR 1 system, and its control output is sent to the signal circuit, servo circuit, deck section, etc. .

Further, in the tuner unit 3, 10 is a power transformer for the tuner unit 3, which receives commercial power as input. Reference numeral 12 denotes a power supply circuit for applying voltage to a microcomputer (drive control means) 13 having a timer function and a control function, and the output of the power transformer 10 is sent through the rectification circuit 11. The rectifier circuit 11, the power supply circuit 12, the microcomputer 13, and a display 14 that displays the current time and program setting time based on the output from the microcomputer 13.
operates at all times while the primary side of the power transformer 10 is connected to the commercial power source. This results in
A program set for recording reservation is held in the memory of the microcomputer 13. Also, 16 is
This is a power supply circuit for supplying power to the VTR 1 and a tuner circuit 17 for selecting a program to be recorded, and the output from the rectifier circuit 15 is input to this via a power switch 18. Reference numeral 19 denotes a charging switch, and by switching this in the charging mode, the output of the power supply circuit 16, that is, the voltage, changes to the VTR1.
The voltage is applied to the charging terminal of the internal battery 5 via an overcharge prevention circuit 20 for preventing overcharging. 21 is a two-circuit recording reservation switch; 22 is a recording reservation ON switch which is activated by a recording reservation ON signal outputted from the microcomputer 13 when the recording reservation state is entered. 23 is an operation key used when setting the recording reservation timer.

Next, the operation will be explained.

When using VTR1 alone as a portable type, switch 4 is on, so
Using the battery 5 as a voltage supply source, the power switch 7
The VTR 1 operates when the switch is turned on.

Next, the operation when the VTR 1 and tuner unit 3 are connected by connecting the connector 2 will be explained.

Switch 4 is open because connector 2 is connected, and power is supplied from tuner unit 3.

Therefore, in order to operate VTR1 now,
First, turn on the power switch 18 of tuner unit 3.
ON, release the recording reservation switch 21 (the switch is
ON state), after turning off the charging switch 19.
Power switch 7 of VTR 1 must be turned on. Further, after the operation is finished, it is necessary to turn off both the power switch 7 of the VTR 1 and the power switch 18 of the tuner unit 3.

Similarly, to charge the battery 5, it is necessary to turn on the power switch 18 of the tuner unit 3 and then operate the charging switch 19.

In addition, in the case of recording reservation, tuner unit 3
Turn on the power switch 18, and turn on the recording reservation switch 2.
1 (the switch is in the OFF state) and the power switch 7 of the VTR 1 is turned ON, the reservation mode cannot be entered unless a series of switch operations are performed.

In addition, if you turn on the recording reservation switch 21,
Since it is on standby, VTR1 operation and battery 5
Charging becomes impossible.

Since the conventional VTR 1 and tuner unit 3 are constructed as described above, it is necessary to operate the power switches of both the VTR 1 and tuner unit 3 when operating the VTR 1 and after the operation is completed. Similarly, it was troublesome to have to operate the power switch of the tuner unit 3 during charging operations and recording reservations. Particularly during recording reservation, the power supply is turned off by the reservation switch 21, making it impossible to charge or operate the VTR, which limits the operating range.

This invention was made in order to eliminate the drawbacks of the conventional devices as described above, and includes bidirectional control lines for the VTR and tuner unit, so that both
An object of the present invention is to provide a magnetic recording and reproducing device that can improve operability and operational performance as a system by operating the device while grasping the operating state of the other party using a control means provided on the device. It is said that

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

FIG. 2 shows the configuration of the main body of the VTR 1, which is connected to the tuner unit 3 shown in FIG. 3 through a connector 2. In the figure, 3
0 is the first power switch control circuit, which is activated when the momentary type power switch 31 is turned on.
When the capacitor 32, bias resistor 33,
A trigger pulse is generated according to the charging time constant by the switching transistor 34. 30' is a second power switch control circuit, which functions similarly to the first power switch control circuit 30 described above. A voltage detection circuit 40 generates a trigger pulse according to the charging time constant using switching transistors 41 and 42, a capacitor 43, and a bias resistor 44 when power is supplied from the tuner unit 3, and sends the trigger pulse to the power ON circuit 50. Connected. 50 is the power supply
The ON circuit turns on the latch relay 51 using the power switch 31 when operating with the battery 5, and using the output pulse of the voltage detection circuit 40 when operating with the external power supply from the tuner unit 3.
This circuit turns off the latch relay 51 using an output pulse from the system control microcomputer 9. In this way, the power ON circuit 50 opens and closes the contacts 52 of the latch relay 51 to turn the power ON and OFF. Reference numeral 60 denotes an output circuit, which uses the output from the system control microcomputer 9 to switch the switching transistor 61 to send a control signal to the tuner unit 3. Note that 63 is a bias resistor and 62 is an output resistor.

Next, the configuration of the tuner unit 3 shown in FIG. 3 will be explained.

Reference numeral 70 denotes a control signal input circuit that receives control signals from the VTR 1 and is connected to the microcomputer 13. 80 is an output circuit, which controls the voltage from the microcomputer power supply circuit 12 by a transistor 81 that is switched by a control signal from the microcomputer 13;
Send it to VTR1 as a control signal. Reference numeral 90 denotes a charging switch, and this switching signal is input to the microcomputer 13, and depending on the situation, the charging changeover switch 91 is controlled to enter the charging mode. Reference numeral 92 denotes a VTR power supply switch for the tuner unit 3, which is opened and closed under the control of the microcomputer 13 when receiving a power ON command from the VTR 1, when the recording reservation timer is ON, or when charging.

a, b, c, d, E, and F are connection lines that connect the VTR 1 and tuner unit 3, a is a control line from tuner unit 3 to VTR 1, and b is a control line that connects VTR 1 and tuner unit 3.
Control line from VTR 1 to tuner unit 3, c
is the power supply line, d is the voltage supply line for charging battery 5, E is the video signal line to be recorded on the VTR,
F is a ground wire.

Next, the operation will be explained.

First, the VTR 1 and the tuner unit 3 are connected by the connector 2, and the tuner unit 3
We will explain when receiving power supply from.

Now assume that VTR1 is in the OFF state. At this time, the voltage supplied to the microcomputer 13 operating the timer in the tuner unit 3 is sent to the control line a from the microcomputer power supply circuit 12 via the output circuit 80. This voltage is applied to the switching transistor 61 of the output circuit 60 in the VTR1.
Since it is in the OFF state, it is sent back to the tuner unit 3 via the control line b through the load resistor 63 and the output resistor 62, and after being input to the control signal input circuit 70, it is connected to the microcomputer 13. At this time, the microcomputer 13 determines that the VTR 1 and tuner unit 3 are connected through the connector 2 since the voltage is sent back.

Next, the power switch 31 is turned on to operate the VTR 1. At this time, in the first power switch control circuit 30, since the voltage from the control line a is applied, the capacitor 32 and the bias resistor 3
3. A trigger pulse is created according to the charging time constant of the switching transistor 34. At this time, a signal as shown in FIG. 4a, which is modulated by the created pulse width, is sent to the control line b. On the other hand, the microcomputer 13 in the tuner unit 3 receives this pulse via the control signal input circuit 70, determines this as an ON signal for the power switch 31, and turns on the VTR power supply switch 92 of the tuner unit 3.
Outputs a control signal to turn on.

As a result, power is supplied from the power supply circuit 16 to the VTR 1 via the power supply line c. received supply
In the voltage detection circuit 40 of the VTR 1, since the switching transistor 41 is turned on, a trigger pulse is created according to the charging time constant by the capacitor 43, the bias resistor 44, and the switching transistor 42, and the voltage detection circuit 40 It outputs a signal as shown in Figure b. The power ON circuit 50 receives this output, turns on the latch relay 51, and uses its contact 52 to turn on the power to the VTR 1.
This timing is shown in FIG. 4c. In this way, when the VTR 1 is powered on and the system control microcomputer 9 starts operating, a control signal is sent to the control line b via the output circuit 60 to notify that the VTR 1 has entered the operating state (FIG. 4 d). As shown in , three pulse codes with a pulse width T, for example T=5 msec, are sent out. As a result, the microcomputer 13 of the tuner unit 3 recognizes that the VTR 1 has entered the operating state.

Next, a case will be described in which the power of the VTR 1 is turned off from this state. When the power switch 31 of the VTR 1 is pressed, the power ON circuit 50 and the first power switch control circuit 3 are activated in the same way as when the power is ON.
0 works. However, the microcomputer 13 in the tuner unit 3 that receives the output from the first power switch control circuit 30 determines that the VTR 1 is currently in operation, and therefore does not accept the trigger pulse, which is the power switch ON signal. In addition, the power ON circuit 50
Although the trigger pulse similar to that of the first power switch control circuit 30 is created, there is no change in the state because it works in the direction of turning on the latch relay 51 only during that period.

On the other hand, the system control microcomputer 9 receives the same trigger pulse as the first power switch control circuit 30 from the second power switch control circuit 30'.
is currently in operation, so this is interpreted as a power OFF signal. In this case, it is fine as long as VTR 1 is in stop mode, but if it is in any other playback, fast forward, or rewind mode, stop that operation, unload it, move the tape to the stop mode position, and then The control microcomputer 9 switches the switching transistor 61 of the output circuit 60 and sends three power-off pulse codes of pulse width T ₁ , for example, T ₁ =10 msec, as shown in FIG. 5a, to the control line b. After that, the system control microcomputer 9 sends a pulse equivalent to the trigger pulse created when the power switch 31 is turned on to the power ON circuit 50, releases the latch of the latch relay 51, turns off the contact 52, and turns on the VTR 1. Turn off the power. This timing is shown in FIG. 5b.

On the other hand, after receiving the power OFF pulse code output from the system control microcomputer 9, the microcomputer 13 in the tuner unit 3 turns on the VTR power supply switch 92 in anticipation of the operating time.
Controls OFF operation. This timing is shown in FIG. 5c.

Next, VTR 1 receives a command from tuner unit 3.
The scheduled recording operation of turning on the VTR 1 and causing the VTR 1 to record will be described.

When the scheduled recording setting time comes, a signal is output from the timer of the microcomputer 13, and in response to this, the microcomputer 13 checks whether the VTR 1 is currently operating. This is the VTR1ON shown earlier in Figure 4d.
It can be easily detected by whether or not the pulse code of time is being sent to the microcomputer 13.

At this time, if VTR1 is in operation,
To prevent unnecessary recording, scheduled recording is not performed. Also, if VTR1 is OFF,
To schedule recording, turn on the tuner unit 3's VTR power supply switch 9 in the same way as when turning on the power.
Turn on 2 to supply power to VTR1, and
Turn on. Thereafter, the microcomputer 13 of the tuner unit 3 receives a pulse code from the system control microcomputer 9 of the VTR 1 indicating that the power of the VTR 1 has been turned on.

As soon as the microcomputer 13 receives this pulse code, it controls the switching transistor 81 of the output circuit 80 to shift to the recording mode, and sets the pulse width T ₂ as shown in FIG. 6a, for example, T ₂ = Three pulse codes of 15 msec are input to the system control microcomputer 9 through the control line a and the input circuit 8. In response to this, VTR1 enters recording mode.

When the recording end time comes, similarly to the above, three pulse codes of pulse width T ₃ , for example T ₃ =20 msec, are sent to the system control microcomputer 9 of the VTR 1 to request power OFF as shown in FIG. 6b. send. The subsequent operation is the same as when the power is turned off.

Next, the charging operation is performed by the charging switch 90 in the tuner unit 3. VTR1 is used for charging.
Since this is performed when it is in the OFF state, it is performed after the microcomputer 13 determines whether or not the VTR 1 is in operation, as in the case of scheduled recording. That is, the microcomputer 13
If VTR1 is in the OFF state, the VTR is turned off by the control signal.
Turn on the power supply switch 92, switch the charge selector switch 91 to the charging side to perform charging, detect the completion of charging with a signal from the overcharge prevention circuit 20, and switch the charge selector switch 91 to the power supply side. , turn off the VTR power supply switch 92.

If VTR1 is in operation, first turn off VTR1 in the same way as when ending scheduled recording.
Then, as soon as the microcomputer 13 receives a power OFF pulse code from the system control microcomputer 9 in the VTR 1, charging is performed in the same manner as described above.

In the apparatus of this embodiment, both the VTR 1 and the tuner unit 3 operate while grasping the operating state of the other party, so that flexible operation is possible and the following effects are achieved.

1 The tuner unit power switch goes out.

2. Since the tuner unit is powered off except when the VTR is operating or charging, unnecessary power consumption can be prevented.

3. Since the DC level is superimposed on the various control signals carried on the control signal lines, and each control signal is obtained by pulse modulation, that is, by changing the pulse width, the number of control lines can be reduced.

4. No power is consumed at the control signal line interface except when operating by control pulses.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and the same effects as in the above-mentioned embodiments can be obtained even if the present invention is implemented as follows.

1. In the above embodiment, control lines a and b are used in both directions, but one control line may be used as long as the control lines are exclusively used in a time-sharing manner.

2 Control pulse code for 5msec, 10msec,
Three cycles of 20 msec each were used, but the pulse code width and number of cycles can be freely selected according to the system. Furthermore, either positive logic or negative logic may be in the active state.

3. A remote control signal for controlling the functional operation of the VTR may be superimposed on the control signal carried on the control line.

4. Although pulse codes with different pulse widths are used as the control signal, the control signal may be set to a DC level, and control may be performed by detecting the level of the DC level.

As described above, according to the magnetic recording and reproducing apparatus according to the present invention, a portable VTR and a tuner unit are bidirectionally connected by a control line, and both parties can grasp the operating status of the other party by means of their control means. Since the system is designed to operate while operating the system, it is possible to improve the operability and the operating performance of the system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a power control system of a conventional magnetic recording/playback device, FIG. 2 is a block diagram of a power control system of a portable VTR of a magnetic recording/playback device according to an embodiment of the present invention, and FIG. 4, 5, and 6 are signal waveform diagrams for explaining the operation of the magnetic recording and reproducing apparatus according to an embodiment of the present invention. . 1... Portable VTR, 3... Tuner unit, 9... System control microcomputer (system control means), 13... Microcomputer (drive control means), 31... Portable VTR power switch, 92... VTR power supply switch ,a,b
...control line. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A portable magnetic recording/playback device (hereinafter referred to as a VTR) that is driven by an internal battery power source or an external power source for recording and playback, as well as charging the battery of the VTR, making recording reservations for the VTR, tuning, and
A tuner unit for supplying power to the VTR, a control line that bidirectionally connects the VTR and the tuner unit, and a control line that connects the VTR to the tuner unit.
system control means for controlling the operation of the VTR and outputting a power on/off request signal to the drive control means (to be described later) of the tuner unit via the control line when the power switch of the VTR is turned on or off; installed in the tuner unit to control the operation of the tuner unit, and to turn on and off the power to the tuner unit upon receiving a power on/off request signal from the system control means, thereby turning on and off the power to the VTR;
When the recording reservation timer turns on, turn on the power to the tuner unit and turn on the power to the VTR, and when the charge switch signal is input, turn on the power to the tuner unit and turn on the power to the above VTR.
1. A magnetic recording and reproducing device comprising: drive control means for controlling charging of a battery of a VTR.