JP3160988B2 - 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 apparatus for recording and reproducing a video signal having an image form different from a standard, such as a case where an image is 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 41 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 42 is provided for setting whether the video signal generated from the video signal circuit 41 is a normal signal or a squeeze type signal. The signal from the setting means 42 is supplied to the video signal circuit 41 and is also supplied from the video signal circuit 41 to the DC potential superimposing circuit 43 provided in the chroma signal system. 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.

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 44. The signal processed by the processing circuit 44 is transmitted through the recording amplifier 45 to the magnetic head 4.
6 and recorded on a recording medium 47. The chroma signal from the input terminal B is supplied to a DC potential discriminating circuit 48, and this discriminating signal is supplied to a circuit 49 for modulating 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 is recorded on the CTL track of the recording medium 47.

Further, a signal reproduced from the recording medium 47 through the magnetic head 46 is supplied to a reproduction processing circuit 53 through a reproduction amplifier 52, and is separated and extracted from the processing circuit 53 into a luminance signal and a chroma signal. A signal reproduced from the recording medium 47 through the magnetic head 51 is supplied to a duty ratio determination circuit 55 through a reproduction amplifier 54. The discrimination signal from the discrimination circuit 55 is supplied from the processing circuit 53 to the DC potential superimposition 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 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 57 constituting The chroma signal from the output terminal D is supplied to the DC potential determination circuit 58. Thus, it is determined whether the generated video signal set by the setting unit 42 is a normal signal or a squeeze signal.

The 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 CRT 9 and the reproduced image enlarged or reduced in accordance with 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 59.

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 42 is supplied to the code signal generation circuit 61, and the generated code signal is provided in the luminance signal system from the video signal circuit 41. The supplied code signal is supplied to an insertion addition circuit 62.

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 42 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 44, and the signal processed by the processing circuit 44 is supplied to the magnetic head 46 through the recording amplifier 45.
And is recorded on the recording medium 47. A signal reproduced from the recording medium 47 through the magnetic head 46 is supplied to a reproduction processing circuit 53 through a reproduction amplifier 52. The reproduction circuit 53 separates the signal into a luminance signal and a chrominance signal and outputs the signals 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 5 constituting the receiver 302.
7 is supplied. Further, the luminance signal from the output terminal C is supplied to the code signal extraction circuit 63 to which the added and inserted luminance signal is added. The extracted code signal is provided and supplied to the decoder 64. The decoder 64 determines whether the generated video signal set by the setting unit 42 is to be a normal signal or a squeeze signal, and the determination signal is supplied to the image processing circuit 57. 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 transmitted by a transmission unit different from the code signal corresponding to the image signal and corresponding to the information on the image form of the video signal (DC potential determination circuit 8 / gate circuit 12,
The extraction circuit 13 and the microcomputer 14), and when only the first code signal is obtained and the second code signal is not obtained, a transmission signal (modulation circuit 10) corresponding to the first code signal Is a video signal recording / reproducing apparatus which records (magnetic head 11) on a recording portion other than the video signal on the recording medium 7.

[0029] The second means according to the present invention is a method for recording data on a recording medium.
A transmission signal corresponding to the information on the image form of the video signal recorded during the vertical blanking period of the luminance signal is detected (determination circuit 24), and the transmission signal corresponds to the information on the image form of the video signal. This is a video signal recording / reproducing apparatus that generates a first code signal (a generation circuit 30), provides the first code signal to the video signal (switch 20), and outputs the video signal.

[0030]

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

[0031]

FIG. 1 shows the configuration of a video signal recording / reproducing apparatus.
A in the figure is a recording system, and B is a reproduction 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, a chroma signal from the input terminal 1B is supplied to the recording signal processing circuit 4. Thus, the signal subjected to the recording process is passed through the recording amplifier 5 to the magnetic head 6.
And 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 determining circuit 8. 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 second code signal from the discriminating circuit 8 is supplied to a circuit 10 for modulating the duty ratio of the CTL signal through an 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 signal is supplied to a gate circuit 12 for taking out the twentieth and 283 horizontal lines of the video signal of the TSC system.
2 is a code signal (VBID) extraction circuit 13
Supplied to The extracted code signal is supplied to a microcomputer (μ-com) 14, and the first code signal corresponding to the information on 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. Thus, the CTL signal modulation circuit 1
In the case of 0, the modulation according to the code signal is performed and recorded on the CTL track of the recording medium 7 regardless of whether the first or second code signal is provided.

The second code signal from the determination circuit 8 is supplied to the code signal generation circuit 15. As a result, the code signal generation circuit 15 generates a 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 denotes a gate pulse generating circuit corresponding to the twentieth and 283rd horizontal lines of the above-described NTSC video signal, for example. The gate pulse from the generation circuit 16 is supplied to the changeover switch 3 through the switch 17 which is turned on only when the first code signal is not determined by the signal from the microcomputer 14. Then, according to the gate pulse, the switch 3
Is switched. Thereby, the code signal generated by the code signal generation circuit 15 is inserted and added to the signal from the switch 2.

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

A signal reproduced from the CTL track of the recording medium 7 through the magnetic head 11 is supplied to a reproduction amplifier 23.
Is supplied to the duty ratio determination circuit 24 through
The discrimination signal from the discrimination circuit 24 is supplied to the DC potential superposition circuit 26 through the OR circuit 25, and the reproduction processing circuit 19
Superimposed on the chroma signal from And this processing circuit 1
The luminance signal and the chroma signal from 9 are taken out to 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 twentieth and 283th of the NTSC video signal.
The signal is supplied to a gate circuit 27 for extracting a horizontal line, and the signal from the gate circuit 27 is supplied to a code signal (VBID) extraction circuit 28. The extracted code signal is supplied to a microcomputer (μ-com) 29, and the first code signal provided in the video signal and corresponding to the information on the image form of the video signal is determined. The first code signal from the microcomputer 29 is supplied to the OR circuit 25. Accordingly, in the DC potential superimposing circuit 26, the 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 discrimination circuit 24 is supplied to the code signal generation circuit 30. As a result, the code signal generation circuit 30 generates a 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 denotes a gate pulse generating circuit corresponding to the 20th and 283rd horizontal lines of the above-mentioned NTSC video signal, for example. The gate pulse from the generation circuit 31 is supplied to the changeover switch 20 through the switch 32 which is turned on only when the first code signal is not determined by the signal from the microcomputer 29. Then, the switch 20 is switched according to the gate pulse. Thus, the code signal generated by the code signal generation circuit 30 is transmitted to the reproduction processing circuit 1.
9 is inserted and added to the luminance signal from FIG.

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

The video signal recording / reproducing apparatus reproduces a video signal in which a code signal is inserted and added to a luminance signal and a DC potential is superimposed on a chroma signal in accordance with the code signal. For example, a receiver 301 to which a method of transmitting information by superimposing a DC potential on a chroma signal (second code signal), and a method of transmitting information by converting the information into a code signal and inserting it into a video signal (second Regardless of the receiver 302 to which the first code signal is applied, the reproduction image can be automatically and appropriately enlarged or reduced.

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

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

In the above-described apparatus, the recording portion other than the video signal on the recording medium is not limited to the above-described CTL, but may be recorded in, for example, a code area related to a PCM audio signal.

Further, in the above-described apparatus, when the modulation of the CTL signal on the recording medium is indispensable, the configuration can be simply implemented as shown in FIG. That is, in FIG.
Is supplied to the OR circuit 9 and only modulates the CTL signal in accordance with the code signal, and supplies the second code signal from the determination circuit 8 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 deleted. In the reproduction system of B, the discrimination circuit 24
To the code signal generating circuit 30 and supply the generated code signal to the other fixed contact of the changeover switch 20 to insert and add it to the luminance signal. The configuration such as supplying the first code signal from the OR 29 to the OR circuit 25 may be omitted.

[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 also corresponds to the first code signal in the reproduced video signal. Since the second code signal is formed from the transmission signal and output, information can be transmitted to the signal source and the 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 device.

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

FIG. 6 is a diagram for explaining this.

[Explanation of symbols]

 1, 1A, 1B Input terminal 2, 17, 32 Switch 3, 20 Changeover switch 4 Recording signal processing circuit 5 Recording amplifier 6, 11 Magnetic head 7 Recording medium 8 DC potential discrimination 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 discriminating circuit 26 DC potential superimposing circuit

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

Claims (2)

(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 first code signal is obtained and the second code signal is not obtained, a transmission signal corresponding to the first code signal is transmitted to the video signal on a recording medium. A video signal recording / reproducing device for recording in a recording portion other than a signal. 2. A vertical blanking period of a luminance signal on a recording medium.
A transmission signal corresponding to the information on the image form of the recorded video signal is detected, and a first code signal corresponding to the information on the image form of the video signal is formed from the transmission signal to form the first code signal on the video signal. A video signal recording / reproducing device provided and output.