JPH0416081A - System conversion video tape recorder - Google Patents

Abstract

PURPOSE:To generate a recorded tape of various systems by identifying a broadcast system of a line input signal, designating the conversion to a desired broadcast system and controlling the conversion. CONSTITUTION:A system discrimination circuit 29 of a reproduction circuit 10 discriminates the system of a reproduction signal and sends a discrimination signal P29 to a system microcomputer 25, then the system microcomputer 25 decides the presence of system conversion in response to the discrimination signal P29 and a signal I28 of a system selector switch 28. Since a line input signal is recorded by the broadcast system desired by the user in this way, a broadcast program in the NTSC system is converted into the PAL or the SECAM system and recorded in Japan and the recorded tape is sent to Europe, then a user in the Europe reproduces the video image by the VTR of the PAL or SECAM system without use of a VTR with system conversion function and the video image is watched.

Description

DETAILED DESCRIPTION OF THE INVENTION The format conversion video tape recorder of the present invention will be explained according to the following items.

A. Field of industrial application B. Outline of the invention C. Prior art D. Problem to be solved by the invention E.2 Means for solving the problem F. Example [Figures 1 and 2] F-1 First example [Fig. 1] a0 Circuit configuration Operation C Effect F-2 Second embodiment [Fig. Specifically, the present invention aims to provide a new system conversion video tape recorder that can convert line input signals into a desired broadcast system and record the signals.

(B. Summary of the Invention) The present invention provides a line input terminal into which a video signal from an external video device is input, a method identification means for identifying a broadcast method of the line input signal sent via the line input terminal, A method specifying means for specifying conversion to a desired broadcasting method; a method converting means for performing method conversion processing on a line input signal; and a method converting means for converting a conversion command signal according to signals from the method identifying means and the method specifying means. By providing a conversion command means that sends pressure to the means and controls it, it is possible to perform desired format conversion on the line input signal and record it. This allows for format conversion to be performed freely without being affected, and tapes recorded in various formats can be created.

(C, Prior Art) The standard broadcasting system for color television is the NTSC system in Japan, the United States, etc., and the PAL system in Europe.
, SECAM system is known.

However, since these broadcasting systems are not compatible, some type of system conversion operation is required.

That is, in order to view a tape recorded on a PAL VTR on an NTSC television monitor in Japan, a VTR is required that has a function of converting the PAL to NTSC format.

(D. Problem to be Solved by the Invention) By the way, in conventional format conversion VTRs, format conversion can only be performed when playing back a recorded tape, and it is possible to arbitrarily convert line input signals from external video equipment. The problem is that it is not possible to perform system conversion.

In other words, format conversion cannot be performed until the video signal, etc., has been recorded on a magnetic tape, and in this case, the format-converted playback signal is always output using a predetermined fixed broadcasting format. , it is not possible to obtain playback output in accordance with various broadcasting systems or to create recording tapes.

Therefore, the system conversion VTR (PAL-h
NTSC) is in the NTSC format, for example, there is no problem in converting a tape recorded in Europe using the PAL format to the NTSC format and watching it in Japan. If you create a tape recorded with NTSC and send it to an area that uses the PAL system, the other party must also have a VTR with a system conversion function (NTSC-PAL in this case) in order to play it. Become.

In order to solve the above-mentioned problems, the system includes a line input terminal into which a video signal from an external video device is input manually, a method identification means for identifying the broadcasting method of the line input signal sent via the line input terminal, and a desired method. a method specifying means for specifying conversion to a broadcasting method; a method converting means for performing a method conversion process on the line input signal; and a method converting means for transmitting a conversion command signal corresponding to the signals from the method identifying means and the method specifying means. and a conversion command means for sending and controlling the conversion command.

Therefore, according to the present invention, it is possible to freely convert not only the format of the playback signal of a recorded tape but also the format of the line input signal from the broadcasting format recognized by the format identifying means to the broadcasting format specified by the format specifying means. Therefore, recorded tapes can be created in various formats without worrying about the broadcasting format.

(E Means for Solving the Problems) Therefore, the system conversion video tape recorder of the present invention (F Example) [Fig. 1, Fig. 2] Below, each embodiment is illustrated in detail of the system conversion video tape recorder of the present invention. Let's explain by following an example.

(F-1, First Embodiment) [Figure 1 (a, Circuit Configuration) Figure 1 shows the main part of the circuit configuration of the system conversion VTRI.

2 in the figure is a line input terminal, to which a video signal from an external video device (not shown) is manually input.

3 is a system discrimination circuit, and the video signal sent through the line input terminal 2 is NTSC or PAL.

This is provided to determine which SECAM broadcasting system is being followed based on differences in horizontal and vertical frequencies. If it is determined that the video signal is in the NTSC or PAL format, a corresponding discrimination signal (hereinafter referred to as "P3") is sent to the system microcomputer (described later), and the video signal is sent directly to the line/ The video signal is sent to the input terminal 4a of the tuner selector switch 4, and the video signal is sent to the SE
If it is determined that it is a CAM system, a conversion circuit (transcoder) 5 converts the video signal from the SECAM system to a PAL system, and then sends it to the input side terminal 4a of the line/tuner selector switch 4. .

6 is a broadcast system compatible tuner that can receive signals according to any of the broadcast systems, NTSC, PAL, and SECAM, and its output signal is output in the signal format according to the predetermined broadcast system, and the line/tuner selector switch 4 is sent to the input end terminal 4b of.

Reference numeral 7 denotes a recording/playback selector switch, which can be switched depending on whether the VTR is in control mode, record mode, or playback mode, and is installed after the line/tuner selector switch 4. There is.

That is, one of the input terminals 7a and 7b 7a (recording side)
Output side terminal 4c of line/tuner selector switch 4
The recording signal of the magnetic tape 9 reproduced by the magnetic head 8 is connected to the other side 7b (reproduction side), and the recording signal of the magnetic tape 9 is connected to the reproduction circuit 1.
It is sent after being subjected to processing such as demodulation using 0.

Reference numeral 11 denotes a Y/C separation circuit, which separates the video signal sent from the output terminal 7C of the recording/playback switch 7 into a Y (luminance) signal and a C (chroma) signal. This is what is sent to the conversion program.

This Y/C separation circuit 11 is necessary because the processing methods regarding brightness and color differ depending on the broadcasting system.
As a method for /C separation, for example, a low-pass filter or a band-pass filter may be used.

Reference numeral 12 denotes a format conversion block, which performs predetermined format conversion processing on Y/C+separated pressure, such as conversion of the number of fields, number of scanning lines, color subcarrier frequency, and inversion of color phase, and outputs the result. , and this allows PAL4
4NTSC format conversion is performed.

The format conversion block 12 once digitizes the Y signal and C signal, stores a predetermined amount of information, for example, two fields in memory, performs format conversion by performing predetermined signal processing on this, and converts it again. I'm trying to return it to an analog value.

That is, as shown in the figure, the system conversion block 12 includes an A/D conversion circuit [3.13'] which converts the Y signal and C signal from the Y/C separation circuit 11 into digital signals, a chroma decoder and noise reducer 14, and a chroma decoder and noise reducer 14. Boto VRAM15,
It consists of a line interpolation (interpolation) and a chroma encoder 16, and the circuit operations of these 14, 15, and 16 are performed by an address controller 18 based on a reference signal obtained from the Y signal by an AFC (automatic frequency control) circuit 17. Controls timing adjustment (time axis correction, etc.).

The format-converted Y signal and C signal are each converted into analog signals by D/A conversion circuits 19 and 19', and then mixed in a mixer 20.

Reference numeral 21 denotes a system selection switch, which is switched depending on whether the video signal applied by the mixer 20 is NTSC, PAL system, or SECAM system. That is,
An NTSC or PAL video signal is sent from the mixer 20 to the input terminal 21a, which is
The connection status differs depending on whether or not to convert to the AM system. If conversion to the SECAM system is not required, the contact switches to the output side terminal 21b, and the video signal is sent to the recording circuit 22.
and is sent to the line output terminal 23.

When converting to the SECAM system, the contact switches to the other output terminal 2ic, so in this case, the video signal converted from the PAL system to the SECAM system by the conversion circuit 24 is transferred to the recording circuit 22 or The signal is sent to the line output terminal 23.

25 is a system microcomputer which sends a system conversion command to the system conversion block 12 in response to the signal from the input section 26 and the determination signal P3 from the system determination circuit 3;
Controls switching of changeover switch 4.7.21.

That is, the human power section 26 is provided with a line/tuner selection switch 27 for selecting either line power or tuner output, and the system microcomputer 25 responds to the signal from the line/tuner selection switch 27. to change the line/tuner changeover switch 4.

The input unit 26 is also provided with a system selection switch 28 so that the video signal can be recorded or output in a desired broadcasting system.
The signal from this method selection switch 28 and the discrimination signal P
3, or a system discrimination circuit 29 (provided within the reproduction circuit 10) that performs signal discrimination regarding the reproduction signal system.

) (This is written as 'P29J.)
Accordingly, switching control of the system conversion switch 21 is performed.

Although not shown in the drawings, the human power section 26 is of course provided with various operation switches related to the control mode of the VTR, such as a record button and a playback button.
The microcomputer 25 plays a role as a control center for general control related to the VTR, such as controlling the changeover/playback switch 7 depending on the current control mode (recording mode or playback mode). Needless to say.

(b. Operation) The operation of the system conversion VTRI is performed as follows.

First, a case will be described in which a video signal output from an external video device is recorded on a magnetic tape as a signal of a desired format.

For example, it is a line input signal or a PAL signal, which is N
Consider the case of converting to the TSC system and recording on a magnetic tape.

First, select line manual power with the line/tuner selection switch 27, and select r with the method selection switch 28.
Select NTscJ and enter the recording mode by operating the input section 26.

In this case, the system discrimination circuit 3 determines whether the line input signal is PA
It is determined that it is an L signal, and a determination signal P3 (hereinafter, the content of P3 will be referred to as PAL).

The initial letter of the NTSC system will be expressed as "N" and rpJ. P,=rPJ is sent to the system microcomputer 25 as a signal.

The line/tuner selector switch 4 is at the line input end (that is, the 4a side), and the record/playback selector switch 7 is at the recording side (7a side), so the PAL video signal is transferred to these selector switches 4.7. The signal is sent to the Y/C separation circuit 11 via the Y/C separation circuit 11.

By the way, since rNTscJ is not selected by the system selection switch 28, the system microcomputer 25 sends a system conversion command to the system conversion block 12, and performs conversion processing from the PAL system to the NTSC system on the Y and C signals. .

In this case, since the system selector switch 21 is set to the NTSC or PAL side (that is, the 21b side), the output signal of the mixer 20 is recorded on the magnetic tape 9 via the recording circuit 22.

At this time, a video signal converted to the NTSC system is sent to the line output terminal 23, so this can be viewed by displaying it on an external video device, such as a TV monitor, or on another VTR (in this case, the NTSC system). ) for parallel recording, etc.

Regarding the operation when converting an NTSC system line input signal to a PAL system and recording, the system selection switch 28
The operation is the same as that described above, except that the line input signal and the discrimination signal P3 (= 'NJ) are different, so the explanation will be omitted. The case of converting to the format and recording will be explained.

In this case, the line input signal is set to SE by the system discrimination circuit 3.
When it is determined that the signal is a CAM signal, the conversion circuit 5 converts the format from the SECAM format to the PAL format.

The determination signal sent to the system microcomputer 25 is P3±"P".

Therefore, the system microcomputer 25 selects the method selection switch 2.
Whether or not to convert the format is determined depending on whether the format selected in step 8 is PAL or NTSC.

That is, if the PAL system is selected by the system selection switch 28, identity conversion to PAL-PAL is performed, and N
If the TSC format is selected, the data will be recorded on the magnetic tape 9 after format conversion to PAL-NTSC.

Next, convert the NTSC or PAL line input signal to SE.
The case of recording using the CAM method will be explained.

If the line input signal is in the PAL format, the format conversion block 12 performs identity conversion, but if the line input signal is in the NTS format,
In the case of C format, it is converted to PAL format.

Since the system selection switch 28 is set to rSECAJ, the system microcomputer 25 sends a switching signal to the system selection switch 21 and sets its contact to the 21c side.

As a result, the video signal output from the mixer 20 is converted from the PAL system to the SECAM system by the conversion circuit 24, and is sent to the recording circuit 22 and the line output terminal 23.

Next, a case where tuner output is selected by the line/tuner selection switch 27 will be described.

In this case, a switching signal sent from the system microcomputer 25 to the line/tuner selection switch 4 switches its contact to the tuner side (4b side).

The video signal frequency-selected by the broadcast system compatible tuner 6 is always determined to be a specific system, for example, the PAL system, so this is the line/tuner selector switch 4,
Y/C separation circuit 11 via recording/playback switch 7
sent to.

The system conversion block 12 performs a predetermined conversion process in accordance with a system conversion command from the system microcomputer 25 corresponding to the system selection switch 28. That is, PAL system or SECAM
In the case of the NTSC system, identity conversion is performed, and in the case of the NTSC system, a system conversion to the relevant system is performed.

Then, the system selection switch 21 is switched depending on whether recording is to be performed in the SECAM system, and the conversion circuit 2
It is determined whether or not to send the signal to the recording circuit 22 or the line output terminal 23 via the output terminal 4.

The above operations are summarized in Table 1 below. In the table, "127J" indicates the signal of the line/tuner selection switch 27, and when "1" or line manual power is selected, r
Indicates when OJ or tuner output is selected, ' I
28J indicates the signal of the method selection switch 28, and "N"
"P" represents the case where the NTSC system is selected, "P" represents the case where the PAL system is selected, and "r3" represents the case where the SECAM system is selected.

In addition, "S4" indicates the state of the line/tuner selector switch 4, "1" indicates that the line input end (4a) is selected, and "O" indicates that the tuner side (4b) is selected. Also, 'S21J indicates the state of the system selector switch 21, and '1' indicates NTSC or PA.
If the L side (21b side) is selected, "0" is SECA
This shows a case where the M side (21C side) is selected.

Note that the discrimination signal "P3" is as described above, but "-" in the table represents indeterminate, meaning that there is no need to discriminate the system when tuner output is selected.

Table 1 As shown in Table 1, the operation of the system conversion block 12 is defined based on the contents of the discrimination signals P3 and 128. That is, if both match, P3=“P” and 1. ,=
In the case of rSJ, identity conversion is performed, and in other cases, method conversion is performed.

Next, format conversion during playback will be briefly explained.

In this case, since the playback button on the input unit 26 is pressed and is in playback mode, the recording/playback switch 7 is switched to the 7b side as shown by the broken line in FIG. 1 under the control of the system microcomputer 25. .

Therefore, the 8-power signal of the reproduction circuit 10 or the Y/C separation circuit]1
After that, it will be sent to the system conversion block】2,
The mode discrimination circuit 29 of the reproduction circuit 10 discriminates the mode of the reproduced signal, and the discrimination signal P29 is sent to the system microcomputer 25, so the system microcomputer 25 uses this discrimination signal P2Q and the signal I28 of the mode selection switch 28. Decide whether or not to convert the system depending on the situation.

Regarding the details of the operation, it is best to consider P3 in Table 1 as the discrimination signal P29 of the system discrimination circuit 29, and ignore the p3=rB column, "I2A", and "S4".

(C effect) The above-mentioned format conversion VTRI not only converts the format of the playback signal of a recorded tape, but also converts the line input signal to a desired format and records it on a magnetic tape. A line output can be obtained, and since the format conversion block 12 is shared during recording/reproduction, format conversion can be realized without complicating the circuit.

In this way, it is possible to record the broadcasting system intended by the user regarding the line input signal.
If you convert the format to NTSC-P, record it, and send the recorded tape to Europe, the other party will have a format conversion function (NTSC-P).
PAL even if you do not have a VTR with AL, SECAM)
Alternatively, the video can be played back and viewed on a SECAM system VTR, and tapes can be exchanged internationally without worrying about television broadcasting systems.

(F-2 Second Embodiment) [Fig. 2] Fig. 2 shows a second embodiment IA of the system conversion video table recorder of the present invention.

The second embodiment IA differs from the first embodiment 1 only in that the line input terminals are separated for each broadcast format and that line switching is required manually. Therefore, only the different parts will be explained, and the explanation of the same parts will be omitted by giving the same reference numerals as those used for the same parts in the first embodiment.

30 is a line input terminal for NTSC signals, 31 is a line input terminal for PAL signals, and 32 is a line input terminal for SECAM signals.

33 is an NTSC/PAL changeover switch, and one of the input terminals 33a is connected to the NTSC/PAL switch from the line input terminal 30.
A signal is input manually, and the other input side terminal 32b receives a PAL signal from the line input terminal 31 or an S signal from the conversion circuit 5.
The ECAM signal or PAL signal is converted and then input manually.

The NTSC/PAL changeover switch 33 is controlled by the system microcomputer 25. That is, switching control is performed in response to signals from a line manual selection switch 34 provided at the input section 26, and the line input signal obtained from the output side terminal 33c is used to select the line at the subsequent stage. / is sent to the input side terminal 4a of the tuner switch 4.

Note that the circuits after the line/tuner changeover switch 4 are the same as in the first embodiment.

In this second embodiment IA, first, video output signals from external video equipment (signal sources) using different broadcasting methods are sent to each line input terminal 30, 31, and 32. Connect like this.

Then, the line input selection switch 34 is used to select a desired system, for example, the PAL system.

Then, under the control of the system microcomputer 25, the NTS
Contact point of C/PAL switch 33 or PAL side (33
b), so the line input terminal 31 or 32
It is possible to receive PAL signals or SECAM signals from

In the case of a SECAM signal, it is converted into a PAL signal by the conversion circuit 5, so the line input signal that passes through the NTSC/PAL changeover switch 33 is a PAL signal in any case.

When the line input selection switch 34 selects NTSC line manual input, the system microcomputer 25 controls the NTSC/PAL selector switch 33 to switch to NTSC mode.
This is the C side (33a).

As described above, the selection signal from the line input selection switch 34 corresponds to the discrimination signal P3 in the first embodiment IA, and in the case of this embodiment IA, this selection is made manually by the user. It is.

In the second embodiment IA, signals from a plurality of signal sources using different broadcasting systems can be accepted, and the circuit is simplified since the system discrimination circuit 3 is not required.

(G. Effect of the invention) As is clear from the above description, the format conversion video tape recorder of the present invention is a system that can convert video signals of a certain broadcasting system to a desired broadcasting system and record the video signal. The conversion video cheap recorder includes a line input terminal into which a video signal from an external video device is input;
a method identifying means for identifying the broadcasting method of the line input signal sent through the line input terminal; a method specifying means for specifying conversion to a desired broadcasting method; and a method for performing method conversion processing on the line input signal. The present invention is characterized in that it is provided with a conversion means and a conversion command means for sending a conversion command signal corresponding to the signals from the system identification means and the system specification means to the system conversion means and controlling the system conversion means.

Therefore, according to the present invention, it is possible to freely convert not only the format of the playback signal of a recorded tape but also the format of the line input signal from the broadcasting format recognized by the format identifying means to the broadcasting format specified by the format specifying means. Therefore, recorded tapes can be created in various formats without worrying about the broadcasting format.

[Brief explanation of drawings]

The drawings show an example of the implementation of the system conversion video tape recorder of the present invention. FIG. 1 is a circuit block diagram showing an embodiment of the vine 1, and FIG. 2 is a circuit block diagram showing a second embodiment. Explanation of symbols 1...Format conversion video tape recorder, 2...Line input terminal, 3...Format identification means, 12...Format conversion means, 25...Conversion command means, 28...Format Specifying means: IA... format conversion video table recorder, 30.31
．． 32...Line input terminal, 34...Method identification means

Claims (1)

[Claims] A system conversion video tape recorder capable of converting and recording a video signal of a certain broadcasting system into a desired broadcasting system, comprising: a line into which a video signal from an external video device is input; an input terminal, a method identification means for identifying a broadcasting method of a line input signal sent through the line input terminal, a method specifying means for specifying conversion to a desired broadcasting method, and a method conversion for the line input signal. A method conversion device comprising a method conversion means for performing processing, and a conversion command means for controlling the method by sending a conversion command signal to the method conversion means in accordance with signals from the method identification means and the method specification means. video tape recorder