JPS6057124B2 - Recording and playback machine - Google Patents

Description

Detailed Description of the Invention When a video signal reproduced from a magnetic tape or the like by a video recorder/player (VTR) is supplied to a television receiver for monitoring, the input of the receiver is switched to the VTR side. cannot receive broadcast signals.

However, when displaying the reproduced image of a VTR on the screen of the receiver, it is also necessary to selectively receive the TV broadcast signal and display the reproduced image in the lower right area of the receiver's screen. It is very convenient to reduce the size and make it bloom. This invention makes it possible to realize such simultaneous playback by simply adding a simple circuit to the VTR without making any changes to the receiver.

FIG. 1 shows an example of the present invention, in which the portion above the broken line is a television receiver, and the portion below is a VTR.

In the receiver, 11 is an antenna, 12 is a changeover switch for broadcast signals and VTR reproduction signals, 13 is a tuner including a video intermediate frequency amplifier and a video detector, 14 is a video amplifier, 15 is a picture tube, and switch 12 By switching to the contact T side, broadcast signals can be received.

On the other hand, in the VTR, 21 is a magnetic tape, 22 is a rotating magnetic head, 23 is a recording system, 24 is a reproduction system, and 25 and 26 are recording/reproduction changeover switches.

Further, 27 is a tuner for selectively receiving a broadcast signal of a desired channel and recording it on the tape 21, and includes a video intermediate frequency amplifier and a video detector. Furthermore, 2
Reference numeral 8 denotes a high frequency modulator that modulates the signal reproduced from the tape 21 into a signal of a specific channel, for example, a certain open channel. When recording, switch 25 and 26 are connected to contact R.
Switch to the side.

Therefore, the broadcast signal selectively received by the tuner 27 is supplied to the recording system 23 through the switch 26, and the recording signal is supplied to the head 22 through the switch 25 and recorded on the tape 21. And when playing, switch 25
and 26 to the contact P side, and switch 12 in the receiver to the contact V side.

Therefore, the signal reproduced from the tape 21 by the head 22 is taken out through the switch 25 and through the reproduction system 24, and the broadcast signal selectively received from the tuner 27 is taken out through the switch 26. In this case, the reproduction system 24 is locked to the synchronization signal of the broadcast signal SA as an external synchronization signal. That is, the reproduced signal Sv is supplied to the synchronization separation circuit 31 and the horizontal synchronization signal is extracted.
This is supplied to the control circuit 33, and the broadcast signal SA is supplied to the synchronization separation circuit 32 to extract a horizontal synchronization signal and a vertical synchronization signal, which are supplied to the control circuit 33.
Drum servo is applied by the horizontal synchronization signal of the reproduction signal Sv and the horizontal synchronization signal of the broadcast signal SA, and capstan servo is applied by the reproduction control signal and the vertical synchronization signal of the broadcast signal SA. The drum servo based on this horizontal synchronization signal reduces the residual jitter of the reproduced signal Sv to about 0.1 μSec. In this way, the reproduction system 24
The reproduced signal Sv obtained is supplied to one input end of the switch circuit 34.

On the other hand, the broadcast signal SA is supplied to a memory 35 for image reduction. The memory 35 is a line memory consisting of a so-called EED, CCD, etc. The control circuit 33 forms a write pulse to which the broadcast signal SA is written, and the control circuit 33 also forms a read pulse to write the broadcast signal SA. The reproduced signal Sv is read out as a broadcast signal Sτ in which the image is reduced to, for example, the lower right area of the screen. Then, this broadcast signal Sτ is transmitted to the switch circuit 3
4 is supplied to the other input terminal. On the other hand, the control circuit 33 generates a signal Sw (see FIG. 4) which is RlJ during the period of the lower right area of the screen due to the reproduction signal Sv and becomes RO during the period of other areas, and this is the switching signal. During the RO period of the signal Sw, the switch circuit 34 is switched to the state shown in the figure, and during the period of the signal SW (RL), the switch circuit 34 is switched to the state opposite to the state shown in the figure. It will be done.

Therefore, the switch circuit 34 outputs a signal that is replaced with the broadcast signal ST in which the image is reduced in the period of the lower right area of the screen out of the reproduced signal Sv (see FIG. 4).
is obtained. This signal is then supplied to the high frequency modulator 28, modulated into a signal of a specific channel, and supplied to the receiver.

Therefore, if you set the tuner 13 on the receiver to tune to this specific channel, the receiver screen will display a At the same time, the reproduced image of the television is displayed in a state where the reproduced image is reduced in size in the lower right area. Note that the reproduced image in a reduced state on the television can be displayed not in the lower right area of the screen but in any other area, and its size can also be arbitrarily selected.

In addition, as shown in FIG. 3, conversely, a reduced version of the VTR playback image can be projected in such a way as to be inserted into the TV playback image.

Furthermore, the reproduced image of the VTR and the reproduced image of the television may be superimposed on the screen of the receiver and displayed simultaneously.

According to this invention, since the output signal of the tuner in the VTR, which is not used during playback in a normal VTR, is used to synthesize the VTR playback signal, simultaneous playback of the TV broadcast signal and the TR playback signal is possible. Furthermore, line memory can be used to control the servo of the VTR with the synchronization signal in the broadcast signal, so the memory capacity can be reduced, costs can be reduced, and the circuit can be simplified.

From the above, the present invention can be realized without making any modifications to the receiver.
By simply adding a simple circuit to the TR, ■When playing swimming,
■TR playback images and TV playback images based on broadcast signals can be displayed simultaneously on the screen of the receiver.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an example of a recording/playback device according to the present invention together with a television receiver, and FIGS. 2 to 4 are diagrams for explaining the same. 21 is a magnetic tape, 22 is a rotating magnetic head, 23 is a recording system, 24 is a reproduction system, 25 and 26 are recording and reproduction switching switches, 27 is a tuner, 28 is a high frequency modulator, 31 and 32 are synchronous separation circuits, 33 is a A control circuit, 34 a switch circuit, and 35 a memory for image reduction.

Claims (1)

[Claims] 1. In a recording/playback machine having a first tuner for selectively receiving broadcast signals and recording them on a recording medium, upon playback, the signals reproduced from the recording medium and the broadcasts selectively received by the first tuner are reproduced. The image of one of the signals is reduced using a line memory, and combined with the other, and supplied to a television receiver having a second tuner that receives the broadcast signal, and the servo of the recording/reproducing machine is connected to the broadcast signal. It is characterized in that the signal reproduced from the recording medium and the broadcast signal selectively received by the first tuner can be simultaneously monitored on the screen of the television receiver by controlling using a synchronization signal inside. Recording and playback machine.