JPH02285889A - Video signal recording and playback device - Google Patents

Abstract

PURPOSE:To remarkably simplify the conversion operation of a television system by providing a conversion mode detecting means to detect the conversion mode of a television system conversion means from a system detected by a television system detecting means and a system selected by first and second television system selection means. CONSTITUTION:In reproduction, a conversion origin selection means 15 selects the television system selected by the television system detecting means 10, and a conversion destination selection means 16 selects the system selected by a television system selection switch 11, and designates the operating mode of a television system conversion circuit 7. In recording, television broadcast received at an antenna 1 and a tuner 2 or an external input signal inputted from a signal input terminal 3 is selected at a signal switch 4, and is sent out to the television system conversion circuit 7 passing a signal switch 5. After the conversion operation of the signal is performed at the television system conversion circuit 7 according to the conversion mode detected at a conversion mode detector 13, a prescribed processing for recording is applied on the signal at a recording and reproduction processing circuit 9, and it is recorded on a recording medium via a head 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a video signal recording and reproducing device capable of converting a signal of one television system into a signal of another television system and reproducing or recording the same. .

Conventional technology Currently, the world's television standards include NTSCIP.
There are methods such as AL and SECAM, each of which differs in field frequency, number of scanning lines, color signal transmission method, etc. On the other hand, a home video tape recorder (hereinafter abbreviated as VTR).

Conventionally, since it complies with the standard television format broadcast in each country, it is not compatible with video tapes recorded in different formats, and cannot be played back and viewed. There are multi-system VTRs that have recording and playback processing circuits compatible with multiple television broadcasting systems for specific regions that can receive multiple television broadcasting systems, but even if you use this, it is not possible to watch video tapes of each system. For this reason, it was impossible to convert and record television signals from one television system to another. In order to playback and watch multi-format video tapes on a television receiver of a specific system, or to convert and record a television signal of one system to another, you need a multi-format VTR. A television format conversion device was needed to convert the television format.

Problems to be Solved by the Invention However, using a multi-system VTR and a television system conversion device as described above is expensive because the devices are separate devices, requires a large space, and requires different However, each time a videotape of the system is played back, it is necessary to change the connection between the devices, change the conversion mode setting of the device, and the operation becomes complicated.

In view of the above-mentioned problems, the present invention is low-cost, compact, and easy to operate, allowing you to play back and watch video tapes of multiple formats, and to convert and record television signals of one format into television signals of another format. It is an object of the present invention to provide a video signal recording and reproducing device that can perform the following functions.

Means for Solving the Problems In order to solve the above problems, the video signal recording and reproducing apparatus of the present invention includes a recording and reproducing processing means capable of recording and reproducing television system signals of at least two or more systems, and a television system for the signals to be reproduced. television system detection means for detecting a television system, television system conversion means for converting a television signal system, and first and second television system selection means for specifying a conversion mode of the television system conversion means. and conversion mode detection means for detecting a conversion mode of the television system conversion means from the system detected by the television system detection means and the systems selected by the first and second television system selection means. It is something that

Effects of the present invention With the above-described configuration, it is possible to record or reproduce television signals of multiple formats, and to convert the format of the television signal to be reproduced or the format of the television signal to be recorded, with a single device. As a result, the device can be configured to be low-cost and compact, and if the television system selected by the first television system selection means is set to the television broadcast system of the country, the system can be used during playback. The television format signal of the playback tape automatically detected by the television format conversion means is converted into the television format of the home country and played back, and when recording, the television format signal of the home country is transmitted to the second television format selection means. Since it is possible to convert and record to the format selected by , conversion operations during recording and playback can be performed very easily.

When used in another country, the same procedure as described above can be achieved by simply setting the television broadcasting system of that country as the system selected by the first television system selection means.

Embodiment Below, a video signal recording and reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a video signal recording and reproducing apparatus according to an embodiment of the present invention. In Figure 1, 1 is an antenna, 2 is a tuner, 3 is a video signal input terminal, 4 is a signal switcher that switches the signal from the tuner 2 and the signal from the video signal input terminal 3, and 5 and e are for recording and playback. A signal switcher that switches the signal flow depending on the time, 7 a television system conversion circuit that converts the television signal system, and 8 a circuit for recording signals on a recording medium and reproducing signals from the recording medium. 9 is a recording and reproducing processing circuit that performs recording processing for recording signals on a recording medium and reproducing processing for reproducing output signals from the recording medium in accordance with at least two or more television systems; 1o; 11 and 12 are television format detectors for detecting the television format of signals reproduced from a recording medium; 11 and 12 are conversion modes of the television format conversion circuit 7 (for example, a mode for converting NTSC format into PAL format, or a mode for converting PAL format into NTSC format; A television system selection switch 13 is used to convert the television system from the system detected by the television system detector 10 and the system selected by the television system selection switches 11 and 12. A conversion mode detector detects the conversion mode of the circuit 7, and 14 is a video signal output terminal.

The operation of the video signal recording and reproducing apparatus configured as described above will be explained first.

First, during reproduction, the signal reproduced from the head 8 is subjected to predetermined reproduction processing in the recording and reproduction processing circuit 9, and then sent through the signal switching device 6 to the system conversion circuit 7. In the system conversion circuit 7, the television system is converted according to the conversion mode detected by the conversion mode detector 13, and then passed through the signal switch 6 and output from the signal output terminal 14. The television system detector 1o detects the television system of the signal reproduced by the recording and reproducing processing circuit 9, and controls the recording and reproducing processing circuit 9 so that the output from the recording and reproducing processing circuit 9 is obtained according to the detected system. At the same time, a detection output is sent to the conversion mode detector 13. Detection of the conversion mode by the conversion mode detector 13 is performed as follows.

FIG. 2 shows a specific example of the conversion mode detection circuit 13 in FIG. 1. In the figure, reference numeral 15 denotes conversion source selection means for selecting the television system before conversion of the television signal converted by the television system conversion circuit 7;
1 is a conversion destination selection means for selecting a television system after conversion, and the other numbers are the same as in FIG. As shown in the figure, during playback, the conversion source selection means 15 selects the television system detected by the television system detection means 1o, and the conversion destination selection means 16 selects the system selected by the television system selection switch 11. The operation mode of the television format conversion circuit 7 is designated by

Note that if the source television system and the destination television system are the same, the television system conversion circuit 7 does not convert the television system and outputs the signal in the original system. In the present invention, the expressions "television system conversion circuit" and "television system conversion means" refer to not only perform a conversion operation when the source system and destination system are different, but also perform a conversion operation when they are the same. It is assumed that the expression is used to include things that do not exist.

Next, the operation during recording will be explained. During recording, in FIG. 1, the television broadcast received by the antenna 1 and tuner 2 or the external input signal input from the signal input terminal 3 is selected by the signal switch 4 and passed through the signal switch 5 to the television format conversion circuit 7. sent to. This signal is converted by the television format conversion circuit 7 according to the conversion mode detected by the conversion mode detector 13, then subjected to predetermined recording processing by the recording/reproduction processing circuit 9, and then recorded through the head 8. recorded on the medium.

In the conversion mode detector 13, as shown in FIG.
The conversion source selection means 15 is a television system selection switch 1
1, and the conversion destination selection means 16 selects the system selected by the television system selection switch 12. If the source television system and the destination television system are the same, the television system conversion circuit 7 does not perform television system conversion, as in the case of reproduction.

In the embodiment described above, the television broadcasting system selection switch 11 may be set so that the television broadcasting system of the home country is normally selected. Then, when playing back, the television system detector 1o automatically plays back the signal recorded on the recording medium in that broadcasting system, converts it to the TV system of your country, and outputs it, so you can check which system it was recorded in. Even if it is a recording medium, you can easily watch it on your home country's television receiver by simply performing the playback operation.

Furthermore, at the time of recording, by simply specifying the television system for recording onto a recording medium using the television system selection switch 12, it is possible to easily record television broadcasts from one's own country or signals from other video equipment. Furthermore, when using the system in another country, the same method as described above can be achieved by simply changing the system selected by the television system selection switch 11 to the broadcasting system of that country.

As described above, according to this embodiment, there is provided a recording and reproducing processing circuit capable of recording and reproducing television format signals of at least two formats, a television format detector that detects the television format of the signal to be reproduced, and a television format detector that detects the television format of the reproduced signal. a television format conversion circuit for converting the format of the 3-channel signal; first and second television format selection switches for specifying the conversion mode of the television format conversion means; Method and the above first and second
By providing a conversion mode detector that detects the conversion mode of the television system converter circuit from the system selected by the television system selection switch, it is possible to record or reproduce television signals of multiple systems. Since it is possible to convert the format of the television signal to be used or the format of the television signal to be recorded using one device, the device can be made smaller and cheaper, and the conversion operation of the television format during recording and playback is easy. It will be very easy to do.

In this embodiment, the conversion mode detector 13 may be configured by a hardware switching circuit, or may be implemented by software using a microcomputer or the like.

Effects of the Invention As described above, according to the present invention, it is possible to record or reproduce a multi-system television broadcast signal, or to convert the system of the television signal to be reproduced or the system of the television broadcast signal to be recorded. It is possible to obtain excellent effects such as being able to implement the device at a low cost and in a small size, and also making it possible to extremely simplify the operation of converting the television system. Furthermore, if it is compatible with television systems around the world, it can be used in any country in the world with the same specifications, and the manufacturing process can also be standardized without having to change processes depending on the destination.

[Brief explanation of drawings]

FIGS. 1 and 2 are circuit diagrams showing an embodiment of the video signal recording and reproducing apparatus of the present invention. 1...Antenna, 2...Tuner, 3
......Signal input terminal, 4,5.6...Signal switcher, 7.TV system conversion circuit, 8.
...Head, 9...Recording and reproducing processing circuit,
1o...Television system detection circuit, 11.1
2...Television system selection switch, 13.
...Conversion mode detector, 14...Signal output terminal.

Claims (2)

[Claims] (1) Recording and reproducing processing means capable of recording and reproducing television system signals of at least two or more systems, television system detecting means that detects the television system of the reproduced signal, and television that converts the television signal system. a television system converting means; first and second television system selecting means for specifying a conversion mode of the television system converting means; A video signal recording and reproducing apparatus comprising conversion mode detection means for detecting a conversion mode of the television system conversion means from the system selected by the television system selection means. (2) The conversion mode detection means includes a conversion source selection means for selecting a television system before conversion of the signal converted by the television system conversion means, and a conversion destination selection means for selecting a system after conversion, The conversion source selection means selects the system detected by the television system detection means during playback,
In other cases, the method selected by the first television method selection means is selected, and the conversion destination selection means selects the method selected by the first television method selection means during playback; In this case, the system selected by the second television system selection means is selected, and the television system conversion means corresponds to the system selected by the conversion source selection means and the system selected by the conversion destination selection means. 2. The video signal recording and reproducing apparatus according to claim 1, wherein the video signal recording and reproducing apparatus is configured to perform a television signal conversion operation.