JPH0443781A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To simply attain reproduction and recording of a tape of multi-system with low cost and small size by providing a conversion control means controlling the conversion mode of the television system conversion means based on the television system selected by 1st - 3rd television system selection means. CONSTITUTION:The device is provided with a recording and reproducing processing circuit 4, a TV system conversion circuit 3 converting the system of a TV signal, a reproduction tape system selector switch 9 selecting the system of a signal reproduced from a magnetic tape, an input TV system selector switch 7 selecting the system of the input TV signal, a conversion destination TV system selector switch 8 selecting the TV system of a recording tape in the recording mode and the system of the output TV signal in the reproduction mode and a conversion controller 6 so that the multi-system TV signal is recorded or reproduced or the conversion of the TV system at recording and reproduction is implemented. Thus, low cost and small size are attained because of one device and each conversion is implemented simply.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus that can convert a television (hereinafter abbreviated as TV) signal into a different TV system signal and record or reproduce the converted signal.

Conventional technology Currently, TV systems in the world include NTSC and PAL.

Each system, such as SECAM, differs in field frequency, number of scanning lines, color signal transmission method, etc. On the other hand, home video tape recorders (hereinafter referred to as VTRs)
(abbreviated as ) has traditionally been compatible with the TV format broadcast in each country, so it was not possible to play back video tapes recorded in different formats or convert them to a different format for recording. . In some areas, there are VTRs that are compatible with multiple TV systems, but even if you use one, you still need a TV receiver that supports each system to watch tapes of each system. It has been impossible to convert the TV signal of one TV system into a signal of another TV format and record it. Therefore, in order to playback and watch tapes of multiple formats on a TV receiver of a specific format, or to convert and record a TV signal of one format to a signal of another TV format, it is compatible with multiple TV formats. A TV format converter was needed to convert the VTR and TV formats.

Problems to be Solved by the Invention However, as mentioned above, the TV system is compatible with multiple TV systems.
Using a TR and TV format converter requires separate devices, which is expensive and requires a large Nupai 7. In addition, it is necessary to change the connection between the devices for playback and recording, making operation complicated. The company faced challenges such as:

In view of the above-mentioned problems, the present invention is a low-cost, /J-type, and allows easy operation to playback and view tapes of multiple formats, converting TV signals of one format to TV signals of another format, and recording The purpose of the present invention is to provide a magnetic recording/reproducing device that can perform the following functions.

Means for Solving the Problems In order to solve the above problems, the magnetic recording and reproducing apparatus of the present invention comprises:
Recording/reproduction processing means capable of recording and reproducing television signals of at least two or more formats, television format conversion means converting television signal formats, and selecting a television signal format to be reproduced from a magnetic tape. a first television system selection means; a second television system selection means for selecting an input television signal system; a third television system selection means for selecting; and a third television system selection means for selecting;
and conversion control means for controlling the conversion mode of the television system conversion means based on the television system selected by the second and third television system selection means.

Effects of the Invention With the above-described configuration, the present invention can perform TV system conversion/reproduction or conversion/recording with a single device, thereby making the device low-cost and compact, and eliminating the need to change connections between devices for recording and playback.

Furthermore, by providing the first TV system selection means and the second TV system selection means with TV system detection means for automatically detecting the TV signal system, the user can select the third TV system at the time of each conversion playback and conversion recording. It is only necessary to specify the TV system selected by the selection means, and each conversion operation can be performed very easily.

Embodiment Below, a magnetic recording and reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of the main parts of a magnetic recording/reproducing apparatus according to an embodiment of the present invention. In Figure 1, 1 is a video signal input terminal, 2 is a signal switcher that switches the signal flow between the recording system and the playback system, and 3
4 is a recording/reproducing processing circuit; 6 is a magnetic head for recording signals on a recording medium and reproducing signals from the recording medium; 6 is a T.
A conversion controller that controls the conversion mode of the V system conversion circuit 3; 7 is an input TV system selection switch that selects the system of the TV signal input from the input terminal 1; 8 is a TV to which the TV system conversion circuit 3 converts; Destination TV system selection switch to select the system, 9 is the number T that is played back from the magnetic tape.
A reproduction tape system selection switch selects the V system; 1o is a signal switch that selects and switches between a converted signal and a non-converted signal; 11 is a video signal high-power terminal;

Next, the operation of the magnetic recording/reproducing apparatus configured as described above will be explained.

First, during reproduction, a signal reproduced from the magnetic head 5 is subjected to predetermined reproduction processing in the recording/reproduction processing circuit 4, and then sent through the signal switcher 2 to the TV format conversion circuit 3.

In the TV system conversion circuit 3, the TV system is converted in accordance with the control signal from the conversion controller 6, and then passed through the signal switch 1o and output from the signal output terminal 11. The playback tape system selection switch 9 selects the TV system of the playback tape, controls the recording/playback processing circuit 4 so that the output from the recording/playback processing circuit 4 is obtained in that system, and also sends the selection to the conversion controller 6. Send. The conversion controller 6 controls the TV format conversion circuit 3 to convert the Tvli code from the format selected by the reproduction tape format selection switch 9 to the format selected by the conversion destination selection switch 8.

Next, the operation during recording will be explained. At the time of recording, the TV broadcast @ number received by the tuner or the input 100 number inputted from the outside is input to the input terminal 1, and is sent to the TV format conversion circuit 3 through the official number switch 2. This signal is converted in the TV system conversion circuit 3 according to the control signal 8 from the conversion controller 6, and then processed for predetermined recording in the recording/reproduction processing circuit 4, and passed through the magnetic head 6 to the recording medium. recorded in The conversion controller 6 selects the conversion destination selection switch 8 from the method selected by the input TV method selection switch 7.
The TV system conversion circuit 3 is controlled to convert the TV signal to the system selected by .

In FIG. 1, the system of the signal inputted from the input terminal 1 and the system of the signal reproduced from the magnetic tape are configured to be selected by the input TV system selection switch 7 and the reproduction tape system selection switch 9, respectively. The signal format may be automatically detected. FIG. 2 shows an example of the configuration in that case. In FIG. 2, the same parts as in FIG. 1 are given the same numbers. The difference from Figure 2 is the input TV.
The system selection switch 7 is an input TV system detection circuit, and the playback tape system selection switch 9 is a playback tape system detection circuit 9. In FIG. 2, an input TV system detection circuit 7' detects the system of the signal input from the input terminal 1 and sends it to the conversion controller 6. Further, the reproduction tape method detection circuit 9 detects the method of the signal reproduced from the magnetic tape and sends it to the conversion controller 6. Other operations are the same as described above.

Input TV signal detection circuit 7' and reproduction method inspection circuit 9'
detects the TV system based on the signal field frequency and color signal system. FIG. 3 shows an example of the configuration of the TV system detection circuit. In the figure, 20 is the input terminal of the TV system detection circuit, 21 is the field frequency discrimination circuit, and 22 is the P
AL system discrimination circuit, 23 is a carrier frequency discrimination circuit, 24
is a system discriminator, and 25 is an output terminal of a TV system detector. In the figure, the field frequency 21 determines whether the field frequency of the input signal is 60° or approximately 60°, and the PAL system discrimination circuit 22 determines whether the input color signal is PA or approximately 60°.
The subcarrier frequency determining circuit 23 determines the frequency of the subcarrier of the input signal by determining whether the phase of the B-Y signal component is inverted for each line. The system discriminator 24 discriminates the TV system of the signal based on the discrimination outputs of the field frequency discrimination circuit 21, the PAL system discrimination circuit 22, and the subcarrier frequency discrimination circuit 23, and outputs the discrimination result to the output terminal 26. The system discriminator 24 may be constructed from a logic circuit or may use a microcomputer or the like.

As described above, according to the present embodiment, there is provided a recording/reproducing processing circuit that can record and reproduce TV system signals of at least two systems, a TV system conversion circuit that converts the TV signal system,
A reproduction tape method selection switch (or reproduction tape method detection circuit) that selects the method of TV @ number reproduced from the magnetic tape, and an input TV method selection switch (or input TV method detection circuit) that selects the method of input TV signals. and,
A conversion destination TV system selection switch that selects the output TV signal system in the playback mode and the TV system of the recording tape in the recording mode, and the conversion side? By providing a B device,
T for recording or playing back multi-system TV signals.
Since it is possible to convert the V signal format or the TV signal format to be recorded using one device, the device can be made smaller and cheaper, and the operation of converting the TV format during recording and playback can be performed very easily. It turns out.

Effects of the Invention As described above, according to the present invention, it is possible to record or reproduce TV signals of multiple formats, or to convert the format of a TV signal to be reproduced or the format of a TV signal to be recorded, with a single device. The present invention can be realized at a low price and in a small size, and the conversion operation of the TV system can be extremely simplified. 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]

1 and 2 are block diagrams showing the structure of an embodiment of the present invention, and FIG. 3 is a block diagram showing the structure of a TV system detection circuit. 1...input terminal, 2... is number switching device,
3...Television system conversion circuit, 4...
...recording/reproduction processing circuit, 6...magnetic head,
6... Conversion controller, 7... Input TV system selection switch, 7'... Input TV system detection circuit, 8... Conversion destination TV system selection switch, 9・
...Playback tape method selection switch, d...
- Playback tape system detection circuit, 1o...signal switch, 11...6 power terminal. Name of agent: Patent attorney Shigetaka Awano and 18 other figures

Claims (3)

[Claims] (1) a recording/reproducing processing means capable of recording and reproducing television system signals of at least two or more systems; and a television system converting means that converts the television signal system;
a first television system selection means for selecting a television signal system to be reproduced from a magnetic tape; a second television system selection means for selecting an input television signal system; and an output television signal in a reproduction mode. a third television system selection means for selecting a television system of the recording tape in the system and recording mode; and a television system selected by the first, second and third television system selection means. A magnetic recording and reproducing apparatus comprising: conversion control means for controlling a conversion mode of the television system conversion means. (2) The magnetic recording and reproducing apparatus according to claim 1, wherein the first television system selection means includes first television system detection means for detecting the system of the signal reproduced from the magnetic tape. . (3) The magnetic recording and reproducing apparatus according to claim 1 or 2, wherein the second television system selection means comprises second television system detection means for detecting the system of the input television signal.