JPH05219473A - Video signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide interchangeability for the transmission of information relating to a form of a picture. CONSTITUTION:A chroma signal from an input terminal 1B is fed to a DC potential discrimination circuit 8, in which a 2nd code signal corresponding to the information relating to a form of a picture in the video signal sent while being superimposed on the DC potential of the chroma signal is discriminated. The 2nd code signal from the discrimination circuit 8 is fed to a circuit 10 modulating a duty ratio of a CTL signal through an OR circuit 9. The signal from the modulation circuit 10 is fed to a magnetic head 11 and recorded on a CTL track of a recording medium 7. Furthermore, a luminance or a video signal from a switch 2 is fed to a code signal (VBID) extract circuit 13 and the extracted code signal is fed to a microcomputer 14 and a 1st code signal corresponding to the information relating to a form of the picture in the video signal provided in the video signal is discriminated. The 1st code signal from the microcomputer 14 is fed to an OR circuit 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording apparatus for recording and reproducing a video signal whose image format is different from the standard such as an image being compressed in one direction.

[0002]

2. Description of the Related Art An aspect ratio of 4: 3 (= 1.33:
With respect to the current video signal of 1), the aspect ratio is 16:
A video signal widened to 9 (= 1.78: 1) has been proposed, and a receiver for displaying such a widened video signal has been implemented. On the other hand, in a movie for theater, in addition to the so-called standard size with an aspect ratio of 4: 3, the European version Vista size with an aspect ratio of 1.66: 1, the American version Vista size with 1.85: 1, and 2. Various formats have been adopted, such as 18: 1 70 mm, 2.35: 1 cinemascope size.

By the way, most of the current broadcast wave and consumer VCRs are compatible with video signals having an aspect ratio of 4: 3, and few are compatible with video signals having an aspect ratio of 16: 9. .. Therefore, the widened video signal and movie for theater as described above are used for the current broadcast wave and VCR.
In the case of a video software for video, it is necessary to convert it into a current video signal with an aspect ratio of 4: 3.

Therefore, when such conversion is performed, the upper and lower sides of the image are aligned with the upper and lower sides of the screen as shown in FIG. 3A, and the image is compressed in the left and right direction to have an aspect ratio of 4: 3. , The so-called squeeze method is being studied. According to this, this video signal has an aspect ratio of 1
When the image is supplied to a 6: 9 image receiver, the image can be stretched to the left and right as shown by B in the figure, and a good wide image can be displayed.

However, when such a squeeze method is adopted, the video signal is exactly the same as the normal one. On the other hand, in a receiver having an aspect ratio of 16: 9 as described above, when a video signal having a normal aspect ratio of 4: 3 is supplied, the image in this video signal is compressed in the left-right direction and displayed on the screen. The aspect ratio of the center of the image is displayed in the range of 4: 3.

Therefore, normally, even when the above-mentioned squeeze system video signal is supplied, as shown in C in the figure, the aspect ratio at the center of the screen having the aspect ratio of 16: 9 is 4 :.
An image compressed in the left-right direction will be displayed within the range of 3. On the contrary, in the case where the process of displaying the image in the entire horizontal deflection width is being performed, when a normal video signal as shown in D of FIG. As shown, the image is stretched horizontally.

In this case, the aspect ratio is 4: 3.
With (= 12: 9) and 16: 9, the compression ratio in the left-right direction is 12: 16 = 3: 4, which is difficult to notice in a general image. For this reason, the viewer may not be aware of the image distortion, and there is a risk that unauthorized viewing will be performed with incorrect processing.

In order to eliminate such a fear, it has been proposed to convert the information regarding the image form of the video signal into a code signal and transmit the code signal together with the video signal. That is, in FIG. 4, 101 is a signal source for generating a video signal in which the aspect ratio is converted to 4: 3. From the video signal circuit 41 which constitutes the signal source 101, the video signal is output with the luminance signal and the chroma signal separated, for example.

Further, there is provided setting means 42 for setting whether the video signal generated from the video signal circuit 41 is a normal signal or a squeeze system signal. The signal from the setting means 42 is supplied to the video signal circuit 41 and is also supplied to the DC potential superposition circuit 43 provided in the chroma signal system from the video signal circuit 41. Then, the luminance signal and the chroma signal from the video signal circuit 41 are supplied to the input terminals A and B of the video signal recording / reproducing device 201.

The luminance signal and the chroma signal supplied to the input terminals A and B of the video signal recording / reproducing apparatus 201 are supplied to the recording processing circuit 44. The signal processed by the processing circuit 44 is passed through the recording amplifier 45 to the magnetic head 4
6 and is recorded on the recording medium 47. Further, the chroma signal from the input terminal B is supplied to the DC potential discriminating circuit 48, and this discriminating signal is supplied to the circuit 49 which modulates the duty ratio of the CTL signal. The signal from the modulation circuit 49 is supplied to the magnetic head 51 through the recording amplifier 50 and recorded on the CTL track of the recording medium 47.

Further, the signal reproduced from the recording medium 47 through the magnetic head 46 is supplied to the reproduction processing circuit 53 through the reproduction amplifier 52, and separated from the processing circuit 53 into the luminance signal and the chroma signal and taken out. A signal reproduced from the recording medium 47 through the magnetic head 51 is supplied to the duty ratio discriminating circuit 55 through the reproducing amplifier 54. The discrimination signal from the discrimination circuit 55 is supplied from the processing circuit 53 to the DC potential superimposing circuit 56 for the chroma signal system. Then, the luminance signal and the chroma signal from the processing circuit 53 are taken out to the output terminals C and D of the video signal recording / reproducing apparatus 201.

The reproduced signals from the output terminals C and D are supplied to the receiver 301 having an aspect ratio of 16: 9. That is, the reproduced signals from the output terminals C and D are transmitted to the receiver 301.
Is supplied to the image processing circuit 57 that constitutes the. Further, the chroma signal from the output terminal D is supplied to the DC potential discriminating circuit 58. As a result, it is determined whether the generated video signal set by the setting means 42 is a normal signal or a squeeze system signal.

This discrimination signal is supplied to the image processing circuit 57 to enlarge or reduce the reproduced image. The enlarged or reduced video signal has an aspect ratio of 16:
The image is supplied to the picture tube 59 of 9 and the reproduced image enlarged or reduced according to the form of the image is displayed. The reproduction image can be enlarged or reduced by controlling the horizontal and vertical deflection width of the picture tube 59.

In this way, the information of the squeeze system signal is modulated with the CTL signal and recorded together with the video signal, and the reproduced signal is separated into a luminance signal and a chroma signal and a DC potential is superimposed on the chroma signal. This information can be transmitted. Then, the transmitted information can be used to automatically and appropriately enlarge or reduce the reproduced image.

However, in this transmission method, the information to be transmitted is basically 1 bit, and other information cannot be transmitted. Further, in a so-called 8 mm VCR, since the CTL is not provided in the format, it is impossible to modulate the CTL signal and record it together with the video signal as described above. Further, if the reproduction signal is not separated into the luminance signal and the chroma signal, the transmission cannot be performed.

On the other hand, the inventor of the present application has previously proposed a method of transmitting information together with a video signal by converting a video signal into a code signal, inserting and adding the information relating to the form of the image (Japanese Patent Application No. 3-103).
159092). That is, in FIG. 5, in the signal source 102 to which this method is applied, the signal from the setting means 42 is supplied to the code signal generating circuit 61, and the generated code signal is provided in the luminance signal system from the video signal circuit 41. And is supplied to the insertion / addition circuit 62 for the code signal.

As a method of inserting and adding the code signal, for example, the 20th and 28th NTSC video signals are used.
By using three horizontal lines, 20-bit data is inserted and added as shown in A of FIG. Here, this 20-bit data is a 6-bit word 0, 4-bit words 1 and 2, and a 6-bit CRCC as shown in B of FIG.
Formed from. Then, the code signal according to the signal from the setting means 42 is provided in the first bit of word 0, for example.

That is, for this word 0, C in FIG.
As shown in (1), the first bit is a discrimination code indicating whether it is a squeeze signal in which the left and right sides of the image are compressed or a normal signal. The second bit is a discrimination code for determining whether it is a letterbox type signal or a normal signal. Further, the third bit is a code for discriminating whether the signal is a Vista size signal including a Muse-NTSC converter with an aspect ratio of around 1.78: 1 or a cinemascope size signal including 70 mm around 2.2: 1. It is said that. The fourth and fifth bits are undefined, and the sixth bit is a discrimination code for other processing (panning).

The luminance signal and the chroma signal from the signal source 102 are supplied to the input terminals A and B of the video signal recording / reproducing device 202. Here, the video signal recording / reproducing device 202 has the same structure as the conventional one. That is, the luminance signal and the chroma signal supplied to the input terminals A and B are supplied to the recording processing circuit 44, and the signal processed by this processing circuit 44 is passed through the recording amplifier 45 to the magnetic head 46.
And is recorded on the recording medium 47. Further, the signal reproduced from the recording medium 47 through the magnetic head 46 is supplied to the reproduction processing circuit 53 through the reproduction amplifier 52, is separated into the luminance signal and the chroma signal from the processing circuit 53, and is taken out to the output terminals C and D.

Further, the reproduced signals from the output terminals C and D are supplied to the receiver 302 having an aspect ratio of 16: 9 to which this method is applied. That is, the reproduction signals from the output terminals C and D constitute the image processing circuit 5 which constitutes the receiver 302.
7 is supplied. Further, the luminance signal from the output terminal C is supplied to the code signal extraction circuit 63 in which the luminance signal is inserted and added, and the extracted code signal is provided and supplied to the decoder 64. Then, the decoder 64 determines whether the generated video signal set by the setting means 42 is a normal signal or a squeeze system signal, and this determination signal is supplied to the image processing circuit 57. To be done.

Therefore, in this transmission method, information relating to the form of the image such as the squeeze system can be converted into a code signal and added to the video signal to be transmitted together with the video signal, and the transmitted information is used to reproduce the reproduced image. The enlargement or reduction can be automatically and appropriately performed. Then, according to this method, it is possible to transmit a plurality of bits of information. Further, it can be applied to a recording / reproducing apparatus such as a so-called 8 mm VCR in which no CTL is provided in the format. Further, it can be applied to the case where the reproduction signal is not separated into the luminance signal and the chroma signal.

However, in the above two transmission methods,
For example, the signal from the signal source 101 to which the method of transmitting information by superimposing a DC potential on the former chroma signal is
A video signal recording / reproducing apparatus 202 to which a method of converting the latter information into a code signal and inserting / adding it into a video signal for transmission is applied.
When supplied to the video signal recording / reproducing apparatus 202
Then, since the same recording and playback as the conventional one is performed,
Information about the image form such as the squeeze method is not recorded.

On the contrary, when the signal from the signal source 102 to which the latter method is applied is supplied to the video signal recording / reproducing apparatus 201 to which the former method is applied, the DC potential of the chroma signal is changed. Since there is no overlap, the video signal recording / reproducing apparatus 201 records / reproduces as a normal video signal,
Also in this case, the information regarding the image form such as the squeeze method is not recorded.

Further, when the signal from the video signal recording / reproducing device 202 to which the latter method is applied is supplied to the receiver 301 to which the former method is applied, the DC potential is superimposed on the chroma signal. Since there is no such information, information regarding the form of the image such as the squeeze method cannot be discriminated, and the process of enlarging or reducing the reproduced image cannot be performed.

When the signal from the video signal recording / reproducing apparatus 201 to which the former method is applied is supplied to the receiver 302 to which the latter method is applied, the information inserted and added in the video signal is added. Therefore, the information regarding the form of the image such as the squeeze method is not discriminated, and the enlargement or reduction of the reproduced image cannot be performed.

That is, in the above two transmission methods,
Due to these incompatibility, it is not possible to transmit information regarding the image form such as the squeeze method between the device to which the former method is applied and the device to which the latter method is applied. Therefore, even if the information about the image form such as the squeeze method is provided by any of the methods, the information is not discriminated, so that the reproduced image cannot be enlarged or reduced automatically and appropriately. It was
The present invention has been made in view of these points.

[0027]

The problem to be solved is that since the two transmission methods are not compatible with each other, information regarding image morphology such as a squeeze method may be transmitted between devices to which different methods are applied. It is impossible to automatically and appropriately enlarge or reduce the reproduced image because the transmission cannot be performed and the information is not discriminated.

[0028]

The first means according to the present invention comprises a first code signal provided in a video signal, the first code signal corresponding to information relating to the image form of the video signal, and the first code signal.
Of the second code signal corresponding to the information relating to the image form of the video signal, which is transmitted by a transmission means different from that of the above-mentioned code signal (DC potential discriminating circuit 8 / gate circuit 12,
When the extraction circuit 13 and the microcomputer 14) obtain only the first code signal but not the second code signal, the transmission signal (modulation circuit 10) corresponding to the first code signal is obtained. Is a video signal recording / reproducing apparatus for recording (magnetic head 11) on a recording portion other than the above video signal on the recording medium 7.

The second means according to the present invention detects a transmission signal (discrimination circuit) corresponding to information relating to the image form of the video signal reproduced (magnetic head 11) from the recording portion other than the video signal on the recording medium. 24) and corresponding to the information on the image form of the video signal from the transmission signal, the first
The video signal recording / reproducing apparatus is configured to generate the code signal (1) (generation circuit 30) and to provide the code signal (changeover switch 20) to output the code signal.

[0030]

According to this, recording is performed by forming a transmission signal corresponding to the first code signal from the second code signal,
Further, since the second code signal is formed and output from the transmission signal corresponding to the first code signal in the reproduced video signal, the information is transmitted to the signal source and the receiver of any transmission method. Transmission can take place.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the structure of a video signal recording / reproducing apparatus.
In the figure, A is a recording system and B is a reproducing system. In this figure,
A video signal in which a luminance signal and a chroma signal are mixed is supplied to the input terminal 1, a luminance signal is supplied to the input terminal 1A, and a chroma signal is supplied to the input terminal 1B. The signals from the input terminals 1 and 1A are selected by the switch 2 and supplied to the recording signal processing circuit 4 through one fixed contact of the changeover switch 3. Further, the chroma signal from the input terminal 1B is supplied to the recording signal processing circuit 4. The signal subjected to recording processing by this is passed through the recording amplifier 5 to the magnetic head 6
And is recorded in the video signal recording portion of the recording medium 7.

The chroma signal from the input terminal 1B is supplied to the DC potential discriminating circuit 8. As a result, the second code signal corresponding to the information relating to the image form of the video signal superimposed and transmitted on the DC potential of the chroma signal is determined. The second code signal from the discrimination circuit 8 is supplied to the circuit 10 which modulates the duty ratio of the CTL signal through the OR circuit 9. The signal from the modulation circuit 10 is supplied to the magnetic head 11 and recorded on the CTL track of the recording medium 7.

Further, the signal from the switch 2 is, for example, N
The gate circuit 1 is supplied to the gate circuit 12 for extracting the 20th and 283 horizontal lines of the TSC video signal.
The signal from 2 is a code signal (VBID) extraction circuit 13
Is supplied to. The code signal extracted here is supplied to the microcomputer (μ-com) 14, and the first code signal corresponding to the information regarding the image form of the video signal provided in the video signal is determined. The first code signal from the microcomputer 14 is supplied to the OR circuit 9. As a result, the CTL signal modulation circuit 1
At 0, no matter whether the first code signal or the second code signal is provided, modulation is performed according to the code signal and recorded on the CTL track of the recording medium 7.

The second code signal from the discriminating circuit 8 is supplied to the code signal generating circuit 15. As a result, the code signal generation circuit 15 generates the first code signal corresponding to the determined second code signal. The generated code signal is supplied to the other fixed contact of the changeover switch 3.

Reference numeral 16 is a gate pulse generating circuit corresponding to the 20th and 283 horizontal lines of the above-mentioned NTSC video signal, for example. The gate pulse from the generating circuit 16 is supplied to the changeover switch 3 through the switch 17 which is turned on only when the signal from the microcomputer 14 does not determine the first code signal. And the switch 3 according to this gate pulse
Is switched. As a result, the code signal generated by the code signal generation circuit 15 is added to the signal from the switch 2.

Further, the signal reproduced from the video signal recording portion of the recording medium 7 through the magnetic head 6 is reproduced by the reproducing amplifier 1.
Reproduction processing circuit 19 for luminance signal and chroma signal through 8
Is supplied to. The luminance signal from the reproduction processing circuit 19 is supplied to one fixed contact of the changeover switch 20, the signal from the changeover switch 20 is supplied to the mixing circuit 21, and is mixed with the chroma signal from the reproduction processing circuit 19. .. This mixed signal is taken out to the video signal output terminal 22.

The signal reproduced from the CTL track of the recording medium 7 through the magnetic head 11 is reproduced by the reproducing amplifier 23.
Through the duty ratio discriminating circuit 24.
The discrimination signal from the discrimination circuit 24 is supplied to the DC potential superimposing circuit 26 through the OR circuit 25, and the reproduction processing circuit 19
Is superimposed on the chroma signal from. And this processing circuit 1
The luminance signal and the chroma signal from 9 are taken out to the output terminals 22C and 22D of the video signal recording / reproducing apparatus.

Further, the luminance signal from the reproduction processing circuit 19 is, for example, the 20th and 283th video signals of the NTSC system.
It is supplied to a gate circuit 27 for extracting a horizontal line, and a signal from this gate circuit 27 is supplied to a code signal (VBID) extraction circuit 28. The code signal extracted here is supplied to the microcomputer (μ-com) 29, and the first code signal corresponding to the information regarding the image form of the video signal provided in the video signal is determined. The first code signal from the microcomputer 29 is supplied to the OR circuit 25. As a result, in the DC potential superimposing circuit 26, a DC potential signal corresponding to the code signal is superimposed on the chroma signal from the reproduction processing circuit 19 regardless of whether the first or second code signal is provided. ..

The second code signal from the discriminating circuit 24 is supplied to the code signal generating circuit 30. As a result, the code signal generation circuit 30 generates the first code signal corresponding to the determined second code signal. The generated code signal is supplied to the other fixed contact of the changeover switch 20.

Reference numeral 31 is a gate pulse generating circuit corresponding to the 20th and 283 horizontal lines of the above-mentioned NTSC video signal, for example. The gate pulse from the generating circuit 31 is supplied to the changeover switch 20 through the switch 32 which is turned on only when the signal from the microcomputer 29 does not determine the first code signal. Then, the switch 20 is switched according to the gate pulse. As a result, the code signal generated by the code signal generation circuit 30 is reproduced by the reproduction processing circuit 1.
It is inserted and added to the luminance signal from 9.

Therefore, in this video signal recording / reproducing apparatus, a signal source 1 to which a method (second code signal) for transmitting information by superimposing a DC potential on a chroma signal is applied, for example.
01 and the signal source 102 to which the method (first code signal) of transmitting information by converting it into a code signal and inserting and adding it into the video signal is transmitted. However, in this video signal recording / reproducing apparatus, the CTL
The signal is modulated and recorded on the CTL track of the recording medium 7.

From this video signal recording / reproducing apparatus, a code signal is inserted and added to a luminance signal, and a video signal in which a DC potential is superimposed on a chroma signal according to this code signal is reproduced. For example, a receiver 301 to which a method of transmitting information by superimposing a DC potential on a chroma signal (second code signal) is applied, and a method of transmitting information by converting it into a code signal by inserting it into a video signal (first It is possible to automatically and appropriately enlarge or reduce the reproduced image regardless of which of the image receivers 302 to which the code signal 1) is applied.

Thus, according to the above apparatus, a transmission signal corresponding to the first code signal is formed from the second code signal (discrimination circuit 8, code signal generation circuit 15, changeover switch 3) and recording is performed. , The first in the reproduced video signal
The second code signal is formed (the gate circuit 27, the extraction circuit 28, the microcomputer 29, the DC potential superimposing circuit 26) from the transmission signal corresponding to the above code signal and is output. Information can also be transmitted to the signal source and the receiver.

In the above-mentioned apparatus, the first code signal is used to transmit not only the squeeze method, but also the so-called letter box method and other information relating to other image forms. Therefore, with respect to the second code signal, the mixing circuit 16 reproduces the signal obtained by further providing a plurality of levels in the DC potential or modulating the signal at a low frequency of several times the vertical or horizontal frequency. It may be superimposed on the chroma signal from 11.

Further, in the above apparatus, the recording portion other than the video signal on the recording medium may be recorded not only in the above-mentioned CTL but also in the code area related to the PCM audio signal, for example.

Further, in the above-mentioned apparatus, when the modulation of the CTL signal on the recording medium is indispensable, the configuration shown in FIG. 2 can be simply implemented. That is, in the drawing, in the recording system A, the microcomputer 14
Is supplied to the OR circuit 9 and only the CTL signal is modulated according to the code signal, and the second code signal from the discrimination circuit 8 is supplied to the code signal generation circuit 15. The configuration of supplying the generated code signal to the other fixed contact of the changeover switch 3 may be eliminated. Further, in the reproducing system of B, the discrimination circuit 24
Is supplied to the code signal generation circuit 30 and the generated code signal is supplied to the other fixed contact of the changeover switch 20 so as to be added and added to the luminance signal. The configuration such as supplying the first code signal from 29 to the OR circuit 25 may be deleted.

[0047]

According to the present invention, recording is performed by forming a transmission signal corresponding to the first code signal from the second code signal, and corresponds to the first code signal in the reproduced video signal. Since the second code signal is formed and output from the transmission signal, information can be transmitted to the signal source and the receiver of any transmission method.

[Brief description of drawings]

FIG. 1 is a block diagram of an example of a video signal recording / reproducing apparatus according to the present invention.

FIG. 2 is a block diagram of another example of a video signal recording / reproducing apparatus according to the present invention.

FIG. 3 is a diagram for explaining a conventional technique.

FIG. 4 is a configuration diagram of a conventional video signal recording device.

FIG. 5 is a configuration diagram of a conventional video signal recording device.

FIG. 6 is a diagram for explaining the explanation.

[Explanation of symbols]

 1, 1A, 1B Input terminals 2, 17, 32 Switches 3, 20 Changeover switch 4 Recording signal processing circuit 5 Recording amplifier 6, 11 Magnetic head 7 Recording medium 8 DC potential discriminating circuit 9, 25 OR circuit 10 Duty ratio modulation circuit 12 , 27 gate circuit 13, 28 code signal (VBID) extraction circuit 14, 29 microcomputer (μ-com) 15, 30 code signal generation circuit 16, 31 gate pulse generation circuit 18, 23 reproduction amplifier 19 reproduction processing circuit 21 Mixing circuit 22, 22C, 22D Output terminal 24 Duty ratio determination circuit 26 DC potential superposition circuit

Claims (2)

[Claims] 1. A first code signal provided in a video signal, the first code signal corresponding to information relating to an image form of the video signal, and the first code signal are transmitted by a different transmission means,
The second corresponding to the information on the image form of the video signal
Of the video signal on the recording medium when the first code signal is obtained but the second code signal is not obtained, the transmission signal corresponding to the first code signal is detected. A video signal recording / reproducing apparatus adapted to record in a recording portion other than a signal. 2. A transmission signal corresponding to information relating to the image form of this video signal recorded in a recording portion other than the video signal on a recording medium is detected, and from this transmission signal, information relating to the image form of said video signal. A video signal recording / reproducing apparatus for forming a first code signal corresponding to the above, and providing the video signal in the above-mentioned video signal for output.