JPH0411423Y2 - - Google Patents

Description

[Detailed description of the invention] A. Industrial application field This invention enables at least two video tape recorders to be housed in the same housing and connected to facilitate dubbing and editing of video tapes. This invention relates to improvements to double video tape recorders.

B. Overview of the invention The present invention is a double video tape recorder that is made up of at least two video tape recorders and facilitates dubbing and editing of video tapes. By switching the images based on the synchronization signal and displaying them separately on the screen of a single monitor receiver, it is possible to view the video output from both video tape recorders at the same time.

C. Prior Art Conventionally, one side is a video tape recorder for playback, the other side is a video tape recorder for recording,
For example, a double video tape recorder in which both are housed in the same housing and connected to facilitate dubbing and editing of the video tape recorder is disclosed in Japanese Patent Application No. 1983, for example.
Applications have already been filed under No. -37165, etc.

Problems to be solved by the D idea However, in the double video tape recorder as described above, the video output signal of either video tape recorder is appropriately selected and outputted using a switch. For example, when playing back both video tape recorders, or when playing back one video tape recorder and recording a television broadcast on the other video tape recorder, the disadvantage is that the video output of both cannot be monitored simultaneously. It was hot.

In order to eliminate the above drawbacks, it is possible to use two monitor receivers, or to supply the output signals of both video tape recorders to each of the two-screen television receivers shown in Japanese Patent Application Laid-open No. 53-100722. However, these methods are not general, and there is no point in projecting them at the same time.

The present invention aims to eliminate the above-mentioned drawbacks, and aims to divide the video output signals of both video tape recorders onto the screen of a single monitor receiver so that they can be viewed simultaneously.

E. Means for Solving the Problems Figure 1 shows a double video tape recorder of the present invention. In Figure 1, 1 is the first video tape recorder that performs playback operations, and the first video tape recorder that performs recording and playback operations. 2 video tape recorders. 3 is both videotape recorders 1 and 2
This switching circuit 3 is input with a video output signal, and this switching circuit 3 is controlled by switching pulses from a switching pulse generation circuit 4 generated in accordance with vertical and horizontal synchronizing signals. Reference numeral 5 denotes a monitor receiver, which displays the switching output signal of the switching circuit 3.

F Effect Therefore, in the double video tape recorder of the present invention, the video output signal of the first video tape recorder 1 and the video output signal of the second video tape recorder 2 are switched by the switching circuit 3, which is switched by the switching pulse. Then, the signal is switched to within the horizontal synchronizing signal period or within the vertical synchronizing signal period, and the video output signals of both video tape recorders are divided and displayed simultaneously on the screen of the monitor receiver 5.

G. Embodiment The switching signal generating circuit 4 of the above-mentioned double video tape recorder may be of any type, but a method as shown in FIG. 2, for example, is efficient. Second
In the figure, 6 is an input terminal for a video signal from a television camera or a television tuner, and this output is supplied to the first video tape recorder 1, and the synchronization signal is sent to a synchronization signal generation circuit 8 through a synchronization signal separation circuit 7. supply The synchronizing signal generating circuit 7 supplies the synchronizing signal output to the servo circuits of the first and second video tape recorders 1 and 2, thereby causing both video tape recorders to operate synchronously. Further, the synchronization signal is supplied to a pulse width control circuit 9 that constitutes the switching pulse generation circuit 4,
Here, the pulse width of the horizontal or vertical synchronizing signal is extended and output as a switching pulse to the switching circuit 3,
The video signals from the first and second video tape recorders are alternately switched and displayed on the monitor receiver 5. Also, in this pulse width control circuit, the resistor R
By changing the pulse width, the screen division ratio can be changed, or by using a control signal, the switching pulse can be fixed to either side, and it can be controlled to select one video tape recorder as a simple switch. .

Therefore, in the above embodiment, as shown in FIG. Since the switching is controlled by the switching circuit 3 using the switching pulse D whose pulse width is widened by the pulse width control circuit 9 based on The other half of the video output signal is used as the video output signal of the second video tape recorder, and the video output signal is divided into the left and right sides of the screen of the monitor receiver 5 and displayed.

If the synchronization signal used for the above switching pulse is a vertical synchronization signal, the screen of the monitor receiver can be divided into upper and lower parts, and when two or more video tape recorders are integrated, the vertical and horizontal By creating a switching pulse based on the synchronization signal, the screen of the monitor receiver can be divided vertically and horizontally, allowing multiple video tape recorders to be monitored simultaneously.

H. Effect As described above, in the double video tape recorder of the present invention, the video output signals of both sides are switched based on the synchronization signal, and the video output signals of both sides are divided and displayed on the screen of a single monitor receiver. Since you can watch the video output from the recorders at the same time, you can play back both video tape recorders at the same time, play one video tape recorder while recording on the other, or even splice recording. This makes it possible to check the beginning and end of a splice when editing, and there is no need to use a special monitor receiver.

[Brief explanation of the drawing]

1 and 2 are block diagrams showing an embodiment of the double video tape recorder of the present invention.
FIG. 3 is a waveform diagram at important points in the same block diagram. DESCRIPTION OF SYMBOLS 1...First video tape recorder, 2...Second video tape recorder, 3...Switching circuit, 4
...Switching pulse generating circuit, 5...Monitor receiver, 8...Synchronizing signal generating circuit.

Claims (1)

[Claims for Utility Model Registration] 1. In a double video tape recorder in which at least two video tape recorders are housed in the same housing and which enables dubbing and editing of video tapes, both video tape recorders; a synchronizing signal generating means for synchronously operating the two video tape recorders, a switching pulse generating means for generating a switching pulse based on the synchronizing signal, a switching means for switching the output signals of both video tape recorders using the switching pulse, and a switching output for the switching output. A double video tape recorder that outputs to a monitor receiver. 2. The synchronizing signal supplied to the switching pulse generating means is a horizontal synchronizing signal, and the switching pulse according to the horizontal synchronizing signal operates the switching means, and the output signals of both video tape recorders are divided into the left and right sides of the screen of the monitor receiver and displayed. A double video tape recorder according to claim 1, which is a utility model. 3. The synchronizing signal supplied to the switching pulse generating means is a vertical synchronizing signal, and the switching pulse according to this signal operates the switching means, and the output signals of both video tape recorders are divided into the upper and lower parts of the screen of the monitor receiver to be displayed. A double video tape recorder according to claim 1, which is a utility model. 4. At least four video tape recorders are provided, and the switching means is operated by switching pulses according to the vertical and Kodaira synchronization signals supplied to the switching pulse generating means, and the output signals of the plurality of video tape recorders are Claim 1 of the above-mentioned utility model registration is characterized in that the above-mentioned utility model is divided into upper, lower, left and right sides of the screen of a monitor receiver.
Double video tape recorder as described in Section 1. 5. The utility model registration request is characterized in that an external video input signal is supplied in place of one of the video tape recorders, and is displayed on the screen of a monitor receiver separately from the output signal of the video tape recorder. A double videotape recorder according to item 1.