JP3160986B2 - Video signal recording and playback device - Google Patents

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 / reproducing apparatus for recording / reproducing a video signal having an image form different from a 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:
For the current video signal of 1), the aspect ratio is 16:
9 (= 1.78: 1) has been proposed, and a receiver for projecting such a widened video signal has been implemented. On the other hand, in a movie for a theater, in addition to a so-called standard size having an aspect ratio of 4: 3, a European Vista size having an aspect ratio of 1.66: 1, an American Vista size having 1.85: 1, and 2. Various formats such as 18: 1 70 mm and 2.35: 1 cinemascope size are employed.

[0003] By the way, most of current broadcast waves and VCRs for consumer use correspond to video signals having an aspect ratio of 4: 3, and a small number of VCRs support video signals having an aspect ratio of 16: 9. . Therefore, the widened video signal or theatrical movie as described above is converted to the current broadcast wave or VCR.
In order to use video software for video, it is necessary to convert the video signal into an existing video signal having an aspect ratio of 4: 3.

Therefore, when performing such conversion, for example, as shown in FIG. 3A, the top and bottom of the image are made to coincide with the top and bottom of the screen, and the image is compressed in the horizontal direction to make the aspect ratio 4: 3. A so-called squeeze method has been studied. According to this, this video signal has an aspect ratio of 1
When supplied to a 6: 9 receiver, the image can be expanded right and left as shown in FIG.

However, when such a squeeze method is adopted, the video signal is exactly the same as a normal signal. On the other hand, in the above-described receiver having an aspect ratio of 16: 9, when a normal video signal having an aspect ratio of 4: 3 is supplied, an image in the video signal is compressed in the left-right direction and the screen is compressed. Is performed in such a manner that the image is projected within the range of the aspect ratio at the center of 4: 3.

For this reason, even when the above-mentioned squeeze-type video signal is supplied, as shown in FIG. 1C, the aspect ratio at the center of the 16: 9 aspect ratio screen is usually 4: 3.
An image compressed in the left-right direction is projected in the range of No. 3. Conversely, when processing is performed to project an image over the entire deflection width in the horizontal direction, when a normal video signal as shown in D in FIG. As shown, the image is expanded in the left-right direction.

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

Therefore, 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, reference numeral 101 denotes a signal source that generates a video signal whose aspect ratio is converted to 4: 3. From the video signal circuit 31 constituting the signal source 101, a video signal is output after, for example, a luminance signal and a chroma signal are separated.

A setting means 32 is provided for setting whether the video signal generated from the video signal circuit 31 is a normal signal or a squeezed signal. The signal from the setting means 32 is supplied to the video signal circuit 31 and is also supplied from the video signal circuit 31 to the DC potential superimposing circuit 33 provided in the chroma signal system. Then, the luminance signal and the chroma signal from the video signal circuit 31 are supplied to the input terminals A and B of the video signal recording / reproducing device 201.

A luminance signal and a chroma signal supplied to input terminals A and B of the video signal recording / reproducing apparatus 201 are supplied to a recording processing circuit 34. The signal processed by the processing circuit 34 is transmitted through the recording amplifier 35 to the magnetic head 3.
6 and recorded on the recording medium 37. The chroma signal from the input terminal B is supplied to a DC potential determination circuit 38, and the determination signal is supplied to a circuit 39 that modulates the duty ratio of the CTL signal. The signal from the modulation circuit 39 is supplied to the magnetic head 41 through the recording amplifier 40, and is recorded on the CTL track of the recording medium 37.

Further, a signal reproduced from the recording medium 37 through the magnetic head 36 is supplied to a reproduction processing circuit 43 through a reproduction amplifier 42, and is separated out from the processing circuit 43 into a luminance signal and a chroma signal. A signal reproduced from the recording medium 37 through the magnetic head 41 is supplied to a duty ratio determination circuit 45 through a reproduction amplifier 44. The discrimination signal from the discrimination circuit 45 is supplied from the processing circuit 43 to the DC potential superimposing circuit 46 on the chroma signal system. Then, the luminance signal and the chroma signal from the processing circuit 43 are taken out to the output terminals C and D of the video signal recording / reproducing device 201.

The reproduced signals from the output terminals C and D are supplied to a receiver 301 having an aspect ratio of 16: 9. That is, the reproduced signals from the output terminals C and D are
Is supplied to the image processing circuit 47 constituting The chroma signal from the output terminal D is supplied to the DC potential determination circuit 48. Thus, it is determined whether the generated video signal set by the setting means 32 is a normal signal or a squeeze signal.

The discrimination signal is supplied to an image processing circuit 47 to enlarge or reduce a reproduced image. The enlarged or reduced video signal has an aspect ratio of 16:
The image is supplied to the CRT 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 widths of the picture tube 49.

In this way, the information of the squeeze signal is modulated with the CTL signal and recorded together with the video signal, 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. The transmitted image can be automatically and appropriately enlarged or reduced using the transmitted information.

However, in this transmission method, information to be transmitted is basically one bit, and other information cannot be transmitted. In a so-called 8 mm VCR, since no CTL is 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 a luminance signal and a chroma signal, 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 code signal into information relating to the form of an image into the video signal, adding the code signal, and transmitting the code signal together with the video signal.
No. 159092). That is, in FIG. 5, in the signal source 102 to which this method is applied, the signal from the setting means 32 is supplied to the code signal generation circuit 51, and the generated code signal is provided in the luminance signal system from the video signal circuit 31. The supplied code signal is supplied to the insertion addition circuit 52.

As a method of inserting and adding the code signal, for example, the 20th and 28th video signals of the NTSC system are used.
As shown in FIG. 6A, 20-bit data is inserted and added using three horizontal lines. Here, this 20-bit data is composed of 6-bit word 0, 4-bit words 1 and 2 and 6-bit CRCC as shown in FIG.
Formed from Then, a code signal according to the signal from the setting means 32 described above is provided, for example, in the first bit of word 0.

That is, for this word 0, C in FIG.
As shown in (1), the first bit is a determination code for determining whether the image is a squeeze signal obtained by compressing the left and right sides of the image or a normal signal. The second bit is a code for determining whether the signal is a letter box signal or a normal signal. Further, the third bit is a code for determining whether the signal is a Vista-size signal including a muse-NTSC converter having an aspect ratio of about 1.78: 1 or a cinemascope-size signal including 70 mm near 2.2: 1. It is said. 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 input terminals A and B of the video signal recording / reproducing apparatus 202. Here, the video signal recording / reproducing device 202 has the same configuration 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 34, and the signal processed by the processing circuit 34 is supplied to the magnetic head 36 through the recording amplifier 35.
And is recorded on the recording medium 37. A signal reproduced from the recording medium 37 through the magnetic head 36 is supplied to a reproduction processing circuit 43 through a reproduction amplifier 42, and is separated into a luminance signal and a chrominance signal from the processing circuit 43 and extracted to output terminals C and D.

Further, reproduced signals from the output terminals C and D are supplied to a receiver 302 having an aspect ratio of 16: 9 to which the method is applied. That is, the reproduced signals from the output terminals C and D are output from the image processing circuit 4 constituting the receiver 302.
7 is supplied. The luminance signal from the output terminal C is supplied to a code signal extraction circuit 53 to which the added luminance signal is added. The extracted code signal is provided and supplied to a decoder 54. The decoder 54 determines whether the generated video signal set by the setting means 32 is to be a normal signal or a squeeze signal, and the determination signal is supplied to the image processing circuit 47. Is done.

Therefore, in this transmission method, information relating to the form of an image such as a squeeze method can be converted into a code signal, inserted into a video signal and added to the video signal, and transmitted together with the video signal. Enlargement or reduction can be performed automatically and appropriately. According to this method, transmission of a plurality of bits of information can be performed. Also, the present invention can be applied to a recording / reproducing apparatus such as a so-called 8 mm VCR in which a CTL is not provided on a format. Further, the present invention can be applied to a case where a reproduced signal is not separated into a luminance signal and a 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 the code into a video signal for transmission is applied.
Is supplied to the video signal recording / reproducing device 202
Will simply perform the same recording and playback as before,
Information about the image form such as the squeeze method is not recorded.

Conversely, 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 Since there is no superposition, the video signal recording / reproducing device 201 performs recording / reproducing as a normal video signal,
In this case as well, recording of information on the image form such as the squeeze method is not performed.

Further, when the signal from the video signal recording / reproducing apparatus 202 to which the latter method is applied is supplied to the receiver 301 to which the former method is applied, superposition of the DC potential on the chroma signal is performed. Since there is no such information, information relating to the form of the image such as the squeeze method is not determined, and it becomes impossible to enlarge or reduce the reproduced image.

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, information added to the video signal is added. Since there is no such information, the information on the image form such as the squeeze method is not determined, and it becomes impossible to perform the process of enlarging or reducing the reproduced image.

That is, in the above two transmission methods,
Because of these incompatibilities, it is not possible to transmit information on the form of an image, such as a squeeze method, between an apparatus to which the former method is applied and an apparatus to which the latter method is applied. Therefore, even if information on the image form such as the squeeze method is provided by any of the methods, since this information is not determined, the reproduction image cannot be enlarged or reduced automatically and appropriately. Was.
The present invention has been made in view of such a point.

[0027]

The problem to be solved is that, since the two transmission methods are not compatible with each other, information about the form of an image such as a squeeze method is transmitted between apparatuses to which different methods are applied. Since the transmission cannot be performed and the information is not determined, the enlargement or reduction of the reproduced image cannot be automatically and appropriately performed.

[0028]

A first means according to the present invention is provided in a video signal, and includes a first code signal corresponding to information relating to an image form of the video signal;
And a second code signal which is transmitted by a transmission unit different from the code signal and corresponds to the information on the image format of the video signal (code signal extraction circuit 1, decoder 2,
And a DC potential determination circuit 3) that, when only the second code signal is obtained and the first code signal is not obtained, the first code signal corresponding to the second code signal is output. This is a video signal recording / reproducing apparatus which is formed (code signal generation circuit 4) and provided in the video signal (code signal insertion / addition circuit 5) for recording.

[0029]

[0030]

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

[0031]

FIG. 1 shows the configuration of a video signal recording / reproducing apparatus 200. In this figure, a luminance signal from an input terminal A is supplied to a code signal extracting circuit 1 to which an added code signal is added, and the extracted code signal is supplied to a decoder 2. As a result, the decoder 2 determines the first code signal corresponding to the information on the image form of the video signal provided in the video signal. Further, a chroma signal from the input terminal B is supplied to the DC potential determination circuit 3. As a result, the second code signal corresponding to the information on the image form of the video signal transmitted by being superimposed on the DC potential of the chroma signal is determined.

The first and second code signals from the decoder 2 and the discrimination circuit 3 are supplied to a code signal generation circuit 4. Thus, in the code signal generation circuit 4, when the first code signal is determined, the first code signal is regenerated. When only the second code signal is determined, the first code signal corresponding to the second code signal is output.
Is generated.

The luminance signal from the input terminal A is supplied to a code signal insertion / addition circuit 5. The code signal generated by the code signal circuit 4 is supplied to the code signal insertion / addition circuit 1. This allows input terminal A
The code signal generated by the code signal circuit 4 is inserted and added to the luminance signal from. This method of insertion and addition is performed in the same manner as in the related art. The signal from the insertion addition circuit 5 is supplied to a luminance signal and chroma signal recording processing circuit 6, and the chroma signal from the input terminal B is supplied to the luminance signal and chroma signal recording processing circuit 6. Then, a signal from the recording processing circuit 6 is supplied to the magnetic head 8 through the recording amplifier 7 and recorded on the recording medium 9.

The signal reproduced from the recording medium 9 through the magnetic head 8 is supplied to a luminance signal and chroma signal reproduction processing circuit 11 through a reproduction amplifier 10. The luminance signal from the reproduction processing circuit 11 is supplied to a code signal extraction circuit 12 to which the added luminance signal is added, and the extracted code signal is supplied to a decoder 13. As a result, the decoder 13 determines the first code signal corresponding to the information on the image form of the video signal provided in the reproduced video signal. The discrimination signal from the decoder 13 is applied to the DC potential superimposing circuit 1 on the chroma signal system from the reproduction processing circuit 11.
4 is supplied. Then, the luminance signal and the chroma signal from the reproduction processing circuit 11 are taken out to output terminals C and D.

Therefore, in this video signal recording / reproducing apparatus 200, for example, a signal source 101 to which a method of transmitting information by superimposing a DC potential on a chroma signal (a second code signal) is applied, and the information is converted into a code signal. Regardless of the signal source supplied from the signal source 102 to which the method (first code signal) inserted and added to the video signal and transmitted, this video signal recording / reproduction is performed. Device 200
Then, a first code signal is generated, and this code signal is inserted and added to the luminance signal and recorded on the recording medium 9.

Further, from the video signal recording / reproducing apparatus 200, a code signal is inserted and added to the luminance signal, and a video signal in which a DC potential is superimposed on a chroma signal in accordance with the 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 (a second code signal) and a method of transmitting information by converting the information into a code signal and inserting it into a video signal ( First
In any of the receivers to which the code signal is applied, the reproduction image can be automatically and appropriately enlarged or reduced.

Thus, according to the above-described apparatus, the first code signal corresponding to the second code signal is formed (code signal extraction circuit 1, decoder 2, code signal generation circuit 4, code signal insertion / addition circuit 5). The recording is performed, and a second code signal is formed from the first code signal in the reproduced video signal (code signal extraction circuit 12, decoder 13, DC potential superposition circuit 14) and output. Therefore, information can be transmitted to the signal source and the receiver of any transmission method.

In the above-described apparatus, when the first code signal is determined, the first code signal does not have to be regenerated and added to the luminance signal. However, also in this case, the presence / absence of the first code signal is determined, and when the second code signal is determined, a first code signal corresponding to the second code signal is generated and the luminance signal is generated. It is necessary to prohibit insertion and addition.

Further, in the above-mentioned apparatus, in the first code signal, not only the squeeze method but also information on other image forms such as a so-called letter box method is transmitted. Therefore, when information on these other image forms is also transmitted by the second code signal, for example, as shown in FIG.
5 and a signal modulated at a low frequency of several times the vertical or horizontal frequency is superimposed on the chroma signal from the reproduction processing circuit 11 by the mixing circuit 16. It may be.

[0040]

According to the present invention, the first code signal corresponding to the second code signal is formed and recorded, and the first code signal in the reproduced video signal is converted to the second code signal. Is formed and output, so that information can be transmitted to a signal source and a receiver of any transmission method.

[Brief description of the drawings]

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

FIG. 2 is a configuration 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 / reproducing apparatus.

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

FIG. 6 is a diagram for explaining this.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Code signal extraction circuit 2 Decoder 3 DC potential determination circuit 4 Code signal generation circuit 5 Code signal insertion addition circuit 6 Luminance signal and chroma signal recording processing circuit 7 Recording amplifier 8 Magnetic head 9 Recording medium 10 Reproduction amplifier 11 Luminance signal And chroma signal reproduction processing circuit 12 code signal extraction circuit 13 decoder 14 DC potential superposition circuit A, B luminance signal and chroma signal input terminal C, D luminance signal and chroma signal output terminal 200 video signal recording / reproducing device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/91-5/956 H04N 5/782-5/783 H04N 7/00-7/015 H04N 9 / 79-9/898

Claims (1)

(57) [Claims] 1. A first code signal provided in a video signal and corresponding to information on an image form of the video signal, and transmitted by a transmission unit different from the first code signal,
The second corresponding to the information on the image form of the video signal
And when only the second code signal is obtained and the first code signal is not obtained, the first code signal corresponding to the second code signal is formed. A video signal recording and reproducing apparatus provided in the video signal for recording.