JPS606587B2 - magnetic recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video recording and reproducing device, and when a program on a certain channel is being viewed on a television receiver and the program on this channel is to be recorded, the video tape recorder is turned off. The video tape recorder's channel can be automatically set to the same channel as the television receiver's channel by simply pressing the magnetic green screen, while the television receiver's channel can be set to the monitor channel. The aim is to provide a playback device.

First, let's look at the basic configuration of a magnetic recording/playback device based on Figure 1.
The operation will be explained.

In the figure, a television signal input from an antenna 1 is applied to a tuner 4 of a video tape recorder 3 on one side by a distributor 2, and the other side is supplied to one fixed terminal 5a of an antenna changeover switch 5. By selecting a desired channel in the channel selection circuit 6 of the video tape recorder 3, the program on that channel can be recorded by the recording/reproducing circuit 7. During this recording, to monitor the program on the channel in the green screen, first connect the antenna conversion switch 5 to the fixed terminal 5b side, and change the channel of the television receiver 8 to the monitor channel (usually the first channel or the first channel). 2 channels are selected.). This is because the frequency band of the television signal sent out from the video tape recorder 3 is converted into the first or second channel and then supplied. 9 in the figure is an RF converter for this purpose, and the signal converted to the first channel or the second channel by this RF converter 9 enters the tuner 10 of the television receiver 8 via the antenna changeover switch 5, and The program being recorded can be monitored using the receiver 8. If you want to watch a program on another channel without changing the recording operation, first turn the antenna selector switch 5 to the terminal 5a side and select the desired channel using the channel selection circuit 11 of the television receiver 8. Then you can watch the program on that channel. This makes it possible to do what is called a green screen for off-screen programs. On the other hand, during reproduction, the channel of the television receiver 8 is first set to the monitor channel, and the antenna changeover switch 5 is connected to the terminal 5b side.

When a playback spade (not shown) of the video tape recorder 3 is pressed here, playback operation is started and the playback image can be viewed on the television receiver 8. Further, the video tape recorder 3 has a pause function, and by pressing a pause button and operating a pause circuit (not shown) in the video tape recorder 8, the tape can be stopped either during printing or during playback. It is possible to temporarily stop the running of the TV, and it is also possible to obtain still images during playback.As is clear from the above, in this type of device, only the television receiver can operate. For example, if you are watching a program on channel 8 on this television receiver 8 and want to watch the program, first turn on the tuner 10 of the video tape recorder 3 to select the channel on the 8th channel.
A manual operation was required to switch channels, and then a recording button (not shown) had to be operated.

Furthermore, if you wanted to monitor these programs at the same time, you had to manually switch the channel on your television receiver to the monitor channel. In view of the above points, the present invention has been devised so that when a television receiver is receiving, for example, the 8th channel and a program on the 8th channel is to be green-screened, it is automatically done by simply operating the key-screen button on the video tape recorder. At the same time, the channel on the video tape recorder side is also switched to channel 8, while the channel on the television receiver is switched to the monitor channel.

An example of this will be described below with reference to FIGS. 2 to 5.

Here, at least the channel selection circuit 1 of the television receiver 8
1 is equipped with an oscillation circuit (not shown), which detects when the channel is switched, generates the same number of pulses as the number of shifted channels, and supplies these pulses to the channel selection pulse output terminal P. ing. In the figure, reference numeral 12 denotes a channel selection signal gate circuit whose input terminal is connected to the channel selection pulse output terminal P of the channel selection circuit 11, and which inverts the inputted channel selection pulse to select the video tape recorder 3. It is supplied to the channel up terminal U of the station circuit 6. When, for example, one pulse is applied to the channel up terminal U, the channel selection circuit 6 switches from the second channel to the third channel. 1
3 is a TV channel mode signal generation circuit whose input terminal is connected to the monitor channel terminal M of the channel selection circuit 11, and whose output is used as a gate signal to send the channel selection signal to the gate circuit 2.It also generates a VTR channel selection section reset signal as a control signal. circuit 14
supply each.

The monitor channel terminal M becomes a low level when a monitor channel is selected, and becomes a high level when another channel is selected. On the other hand, when the monitor channel terminal M of the television channel mode signal generating circuit is at a low level, that is, when the monitor channel is selected,
"1", when monitor channel terminal M is high level,
That is, when a channel other than the monitor channel is selected, a signal of "0" is output. Turtle 5 is a gate signal generation circuit whose input device is connected to the green terminal R of the video tape recorder 3, and whose output is applied to the channel selection signal gate circuit 2 as a gate signal. Here, a signal which is "1↓" when the video tape recorder 3 is in the recording state and "0" otherwise is generated at the green picture terminal R. Also, this signal from the recording terminal R is applied to the VTR channel selection section reset signal generation circuit 141 as a control signal. 96 is a TV channel monitor selection circuit, the input end of which is connected to the green screen terminal R, and the input end is connected to "
It operates when a signal "1" is added, and switches the channel of the television receiver 8 to the monitor channel.

Further, the VTR channel selection section reset signal generation circuit 14 outputs "0" from the TV channel mode signal generation circuit 13.
When the output terminal R is "0", an output is generated and the output signal is applied to the reset terminal T of the channel selection circuit 6. Further, the channel selection signal gate circuit 12 inverts the channel selection pulse appearing at the channel selection pulse output terminal P when the output of the TV channel mode signal generation circuit 13 is "0" and the output of the gate signal generation circuit 15 is "1". and is applied to the channel up terminal U of the channel selection circuit 6 in the video tape recorder 3. On the other hand, the gate signal generation circuit 15 generates a pulse that becomes "1" for only 30 seconds from the moment the input rises from "0" to "1". This time of 30 seconds is the time that can cover all the pulses when the number of channel selection pulses is the greatest. Next, its operation will be explained with reference to FIGS. 3 and 4. FIG. 3 shows the structure of the channel selection buttons of the video tape recorder 3 and the television receiver 8. In the television receiver 8, the upper left end is the monitor channel, and the second channel is on the right. The third channel is set as ``...''.Here, it is assumed that the first channel is set as the monitor channel.The video tape recorder 3 is also configured in the same way. Assume that the channel selection nail 11a of the television receiver 8 is operated to receive the sixth channel.

At this time, the monitor channel terminal M becomes high level, and therefore the TV channel mode signal generation circuit 13
The output is "0". On the other hand, since the green terminal R of the video tape recorder 3, that is, the output C, is also "0",
The VTR channel selection section reset signal generating circuit 14 generates an output "11" and applies it to the reset terminal T. As a result, the video tape recorder 3 is reset to the first channel which is the monitor channel. A switch circuit (not shown) is connected in parallel to the first channel selection switch (not shown) of the recorder 3,
The output of the VTR tuning unit reset signal generation circuit 14 closes the switch circuit and selects the first channel. At this time (point a in Figure 4), even if the channel of the television receiver 8 is switched from ``31'' to ``6'', both outputs and 2 are ``0'' and the channel selection signal gate circuit 12 is closed. Therefore, even if three channel selection pulses (FIG. 4A) are output to the channel selection pulse output terminal P, they will not be applied to the channel up terminal U.

Here, when the recording nail of the video tape recorder 3 is pressed to start the recording operation (point b in Figure 4), the recording terminal R is
It rises to "1" from "0".

This output C is applied to the VTR tuning unit reset signal generation circuit 14, gate signal generation circuit 15, and television channel monitor tuning circuit 16, respectively. As mentioned above, the VTR tuning section reset signal generating circuit 15
A pulse (FIG. 4, 2) that becomes "1" is generated only during this period.
On the other hand, the television channel monitor selection circuit 16 switches the channel of the television receiver 8 from the sixth channel to the monitor channel. In this case, for example, a switch circuit (not shown) is connected in parallel to a monitor channel selection switch (not shown), and the monitor channel is selected by closing this switch circuit. . At this time, the channel selection circuit 11 generates at the output terminal P the same number of pulses as the number of shifted channels, that is, five continuous pulses (FIG. 4A) by the action of the oscillation circuit.

In this case, the oscillation circuit detects each channel terminal and stops oscillation when the channel terminal is at a low level, that is, when located at the selected channel. At this time,
Since the output 2 of the channel selection signal gate circuit 12 is "1" and the output 2 is "0", it is opened to invert the channel selection pulse and supply it to the channel up terminal U of the video tape recorder 3. On the other hand, at this time (when the green drawing button is pressed), V
Since one input C of the TR channel selection section reset signal generation circuit 14 changes from "0" to "1", the reset signal (FIG. 4 E) disappears, and the channel selection circuit 6 can move from the first channel to the current channel. state. Therefore, the channel selection circuit 6 of the video tape recorder 3 moves in the upward direction by five stations, and the sixth channel is selected. Note that even if the channel selection circuit 11 of the television receiver 8 is operated to select another channel to receive the program on the broadcast waves during recording (point d in Figure 4), the television receiver 8 Although the program of the newly selected channel is displayed on the screen, since the output 2 of the gate signal generation circuit 15 is "0", the channel selection signal gate circuit 12 does not open, and the channel selection pulse is It is not supplied to the up terminal U of the channel selection circuit 6 of the tape recorder 3. That is, the video tape recorder 3 continues to record the program on the sixth channel. Also, when the channel of the television receiver 8 is selected as the monitor channel, the output is "1",
In addition to the fact that the channel selection signal gate circuit 12 does not operate,
Since the channel selection pulse does not appear, the channel selection circuit 6 of the video tape recorder 3 maintains the same channel.
As described above, according to this configuration, when a program on a certain channel is being viewed on the television receiver 8 and the program on the channel is desired to be recorded, the video tape recorder 3
By simply pressing the recording button, the video tape recorder 3 can be set to the same channel as the television receiver 8, and the television receiver 8 can be switched to the monitor channel.

That is, by simply operating the recording button, recording of a desired channel can be started, and that channel can be monitored. A specific example is shown in FIG.

In the figure, transistors 21, 22, and 23 constitute the channel selection signal gate circuit 12, respectively.
is connected to the tuning pulse output terminal P of the tuning circuit 11. A transistor 24 constitutes the television channel mode signal generation circuit 13, and its base is connected to the monitor channel terminal M.

Further, the transistor 24 has a relay coil 25 inserted between the collector and the 10B power source, and has a relay contact 26 controlled by the relay coil 25 in parentheses. Reference numeral 27 denotes a transistor constituting the VTR tuning section reset signal generation circuit 14, whose collector is connected to the reset terminal T of the tuning circuit 6.

The base of the transistor 27 is connected to the terminal A of the relay contact 26 via a backflow prevention diode, etc., and the terminal R is connected to the terminal A where a predetermined voltage (12V) appears during recording.
is connected to. 28 is a transistor constituting the gate signal generation circuit 15, and has a base for bias;
Further, resistors 29 and 30 and a capacitor 31 forming a charging/discharging circuit are connected.

32 is a transistor that constitutes the TV channel monitor selection circuit 16, a capacitor 33 and a resistor 34 that constitute a time constant circuit are connected to the base, and a relay coil 3 is connected to the collector.
5 and is provided with a relay contact 36 controlled by a relay coil 35 in parentheses.

This relay contact 36 is connected to the monitor channel selection switch (
(not shown) are connected in parallel. Next, its operation will be explained.

Now, when the sixth channel is selected on the television receiver 8, the monitor channel terminal M goes from a low level to a high level, and the transistor 24 is turned on. When the transistor 24 is turned on, current flows through the relay coil 25, and the relay contact 26 is switched from the terminal A side to the terminal B side. As a result, the transistor 27 is turned off, a reset signal is applied to the reset terminal T, and the video tape recorder 3 is reset to the first channel, which is the monitor channel. By turning on the switching element connected in parallel to the first channel selection switch (not shown) of the video tape recorder 3 using the reset signal, the first channel selection switch is turned on in the same way as when the selection switch is closed. to select the station. Next, when the recording spade of the video tape recorder 3 is pressed, a predetermined voltage appears at the green terminal R, turning on the transistor 32 for a certain period of time until the capacitor 33 is sufficiently charged.

When the transistor 32 is turned on, the relay coil 35 switches the relay contact 36 from the terminal A to the terminal B, so that the television receiver 8 selects the monitor channel (first channel). At the same time, the oscillation circuit (operation) starts operating. A channel selection pulse is generated at the terminal P until a channel terminal at - level is detected, that is, until a monitor channel is detected. In this case, five tuning pulses are generated. On the other hand, the transistor 28 remains active until the capacitor 31 is sufficiently charged (30 se
c) is off, and a voltage of 12V appears at its collector, so the transistor 22 is turned on, and the tuning pulse appearing at the terminal P is passed through the transistor 21 to the up terminal U of the tuning circuit 6 of the video tape recorder 3. supplied to As a result, the channel selection circuit 6 of the video tape recorder 3 selects the sixth channel from the first channel. Incidentally, the moment a predetermined voltage appears at the mirror terminal R, the transistor 27 turns on and the reset signal disappears.

Furthermore, in a device in which a pause channel in the same frequency band as the monitor channel is provided, and tape running is temporarily stopped by selecting the pause channel, one channel selection pulse appears at this time as well. There is a problem in that the channel of the video tape recorder 3 is increased by one due to this channel selection pulse. The transistor 23 prevents this from happening, and when the pause channel is selected (circuit-wise, this is the same as when the monitor channel is selected), the transistor 23 is turned on and the transistor 22 is turned on.
is turned off to prevent the channel selection pulse from being applied to the video tape recorder 3. As explained above, according to the present invention,
For example, if you are watching channel 8 on your television receiver and want to record a program on channel 8, you can automatically switch the video tape recorder's channel to channel 8 by simply operating the record button on the video tape recorder.
In addition to being able to set channels, you can also select channels on your television receiver as monitor channels.
Television receiver before operating the recording nail, which was required in the past.
This eliminates the need for channel switching operations on a video tape recorder, which is extremely convenient in practice.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the basic configuration of a magnetic recording/playback device, FIG. 2 is a block diagram of a magnetic green image playback device in an embodiment of the present invention, FIG. 3 is a front view of the main parts of the device, and FIG. 4 5 is a time chart for explaining the operation, and FIG. 5 is a circuit diagram showing a specific configuration. 3...Video tape recorder, 6,11...Tuition selection circuit,
8... Television receiver, 12... Channel selection signal gate circuit, 13... Television channel mode signal generation circuit, 14... VTR channel selection section reset signal generation. Circuit, 15...Gate signal generation circuit, 16...TV channel monitor selection circuit. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1 means for detecting that the recording button of the video tape recorder has been operated; means for setting the channel of the television receiver as a monitor channel by the output of the detection means; means for resetting the channel to the same channel as the monitor channel; means for detecting the movement of the channel of the television receiver and generating pulses of the same number as the number of moved channels; and operation for a certain period of time based on the output of the detection means. and means for applying the tuning pulse to a tuning circuit of a video tape recorder.