JP2950169B2 - Video recording 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 recording apparatus and a video reproducing apparatus, and more particularly, to a video recording apparatus and a video reproducing apparatus for displaying subtitles on a video in a video apparatus.

[0002]

2. Description of the Related Art Conventionally, in this type of technology, it is common to create a video signal in which a caption is superimposed on a video image in advance and display it on a video display device. But,
In the case where subtitles are superimposed on the original video in this way, it becomes difficult to respond to a request for not displaying the subtitles or replacing them with another subtitle. This is because the video signal has already been lost in the subtitle character portion, and traces of erasing the subtitle remain in the video.

Various techniques have been proposed to solve the above problems. For example, Japanese Patent Application Laid-Open No. 62-239680
Japanese Patent Application Laid-Open Publication No. H11-163873 describes a technique in which an audio track of a video tape is secured as an area dedicated to character data, and the character data is recorded so that the character data is displayed as an image on a video display device during reproduction. I have.

Japanese Patent Application Laid-Open No. 57-169794 discloses an analog image display system in which image data information such as characters and figures are recorded simultaneously during a horizontal scanning period in a vertical blanking period of a video signal. A technique is described in which information such as characters and graphics is mixed and displayed on an apparatus.

[0005]

In the above-mentioned prior art, when an audio track of a video tape is used as an area dedicated to character data, the audio track is exclusively used for recording a subtitle signal. However, there is a problem that sound cannot be recorded. Further, when a subtitle signal is recorded in a horizontal scanning period during a vertical blanking period, there is a problem that a circuit configuration for extracting the subtitle signal becomes complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a video recording apparatus and a video reproducing apparatus for appropriately controlling display and non-display of subtitles so that traces of subtitles do not remain in the video. Another object of the present invention is to provide a video recording device and a video reproducing device capable of recording and reproducing subtitles and simultaneously recording and reproducing audio under a simple circuit configuration. It is in.

[0007]

Video recording apparatus of the present invention to solve the above problems SUMMARY OF THE INVENTION may scratch the head portion and the signal obtained by adding an identification signal respectively to the end portion and the audio signal of the caption signal
Combine the two signals and record.

Further, another video recording apparatus of the present invention includes a caption generating means for generating a caption signal and a synchronizing signal, and a heading and an ending portion of the caption signal according to the synchronizing signal from the caption generating means, respectively. Identification code adding means for generating an identification code-added subtitle signal by adding an identification signal indicating a head part and an end part; and the identification code-added subtitle signal and the audio signal according to the synchronization signal from the subtitle generation means . and <br/> synthesized signal and a switching means for generating a caption audio signal.

Further, the video reproducing apparatus of the present invention reproduces a signal in which a subtitle signal and an audio signal are combined into one signal and separates the signal into the subtitle signal and the audio signal.

[0010] Further, another video reproducing apparatus of the present invention is a video part reproducing means for reproducing a video signal, and an audio part reproducing means for reproducing a subtitle audio signal in which a subtitle signal and an audio signal are combined into one signal. An identification unit for identifying a subtitle signal from the subtitle audio signal reproduced by the audio unit reproduction unit; a separation unit for separating a subtitle signal and an audio signal from the subtitle audio signal based on an identification result of the identification unit; A subtitle video signal generation unit that generates a video signal representing a subtitle from the subtitle signal separated by the separation unit, a subtitle video signal generated by the subtitle video signal generation unit, and a video signal reproduced by the video unit reproduction unit And synthesizing means for synthesizing.

Further, another video reproducing apparatus of the present invention further includes switch means for switching whether or not the video signal generated by the subtitle video signal generating means is synthesized by the synthesizing circuit.

In another video reproducing apparatus according to the present invention, the caption signal has an identification signal indicating a head part and an end part added to a head part and an end part, respectively. And a means for detecting the end portion, and a flip-flop which is set when the header is detected by the detection means and reset when the footer is detected.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the video recording apparatus of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a video recording apparatus according to an embodiment of the present invention includes a video camera 1 for capturing a video and generating a video signal, and an audio generation circuit 2 for generating an audio signal.
A caption insertion circuit 3 for generating a caption signal, an identification code addition circuit 4 for adding an identification code to the caption signal, and an audio signal from the audio generation circuit 2 and an identification code addition circuit 4 according to the instruction of the caption insertion circuit 3. And a video recording / reproducing device 6 for recording the video signal from the video camera 1 and the signal from the switching circuit 5 on a video tape.

The caption insertion circuit 3 generates a caption signal a,
This is sent to the identification code adding circuit 4. Also, the caption insertion circuit 3 generates an insertion signal c indicating that the caption signal with the identification code is being output, and sends the signal to the identification code addition circuit 4 and the switching circuit 5. This subtitle insertion circuit 3
It is widely used as a device for outputting character information and the like input by input means such as a keyboard as a caption signal.

The identification code adding circuit 4 adds an identification code to the caption signal a from the caption insertion circuit 3 and inputs it as an identification code-added caption signal b to one input terminal of the switching circuit 5. At this time, the identification code adding circuit 4 is
The identification code is added according to the instruction by the insertion signal c. Here, the identification signal is composed of a pair of a “header” indicating the start of a subtitle signal and a “footer” indicating the end of the subtitle signal, and a portion sandwiched between the header and the footer is a subtitle signal. It represents something.

On the other hand, the audio circuit 2 inputs the audio signal d to the other input terminal of the switching circuit 5 simultaneously with the video signal j from the video camera 1.

The switching circuit 5 selects one of the subtitle signal b with the identification code from the identification code adding circuit 4 and the audio signal d from the audio circuit 2 in accordance with an instruction by the insertion signal c from the subtitle insertion circuit 3. It outputs to the video recording / reproducing apparatus 6 as a subtitle audio signal e.

Next, the operation of the above-described embodiment of the video recording apparatus of the present invention will be described with reference to the drawings.

Referring to FIG. 2, the caption signal a output from the caption insertion circuit 3 is output from the
A header code (indicated as H in the figure) is added to the head part and a footer code (indicated as F in the figure) is added to the end part as identification codes. The caption signal to which these identification codes are added is
The subtitle signal b with the identification code is input to the switching circuit 5.
In the caption insertion circuit 3, while the caption signal b with identification code is being input to the switching circuit 5, the insertion signal c is “1”.
Control so that That is, the caption insertion circuit 3
The insertion signal c is set to “1” when the output of the caption signal a is started, and thereafter, the insertion signal c is set to “0” when the total time of the length of the caption signal a and the identification signal elapses.

While the insertion signal c is “1”, the switching circuit 5 outputs the caption signal b with the identification code from the identification code adding circuit 4.
And outputs it as a subtitle audio signal e. Conversely, while the insertion signal c is “0”, the switching circuit 5 selects the audio signal d from the audio circuit and outputs it as the subtitle audio signal e.

As a result, the subtitle audio signal e is supplied to the video recording / reproducing apparatus 6 in a form in which the audio signal and the subtitle signal are mixed as one signal. In the video recording / reproducing apparatus 6, the video signal j from the video camera 1 is recorded in the video track of the video tape, and the caption audio signal e is recorded in the audio track. That is, the subtitle signal does not occupy the audio track, and the audio signal can be recorded simultaneously with the subtitle signal.

Next, an embodiment of the video reproducing apparatus of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 3, a video reproducing apparatus according to an embodiment of the present invention includes a video recording / reproducing apparatus 6 for reproducing a video signal and an audio signal recorded on a video tape, and a subtitle audio signal e '. And a switching circuit 8 that outputs a subtitle audio signal e ′ to the subtitle signal a1 or the audio signal d1 according to the classification signal h. Have. Further, the subtitle signal a1 is delayed for a certain period of time to delay the subtitle signal a2.
, A logical product circuit 10 that outputs the delayed subtitle signal a2 as the reproduced subtitle signal a ′ only when the classification signal h indicates that the subtitle signal is being output, and a reproduced subtitle signal a ′ that is a character code. Video signal generating circuit 11 which converts and outputs a subtitle video signal k which is a video of a character pattern
And a switch 12 for instructing whether or not to display the subtitle video signal k, a synthesizing circuit 13 for generating a video signal by synthesizing the video signal j ′ with the subtitle video signal k, And a video display device 16 for displaying a video signal. Further, a delay circuit 14 for delaying the audio signal d1 for a certain period and outputting a delayed audio signal d2, and a delayed audio signal d2 only when the classification signal h indicates that the audio signal is being output.
And an AND circuit 15 for outputting as a reproduced audio signal d ′,
Audio generator 1 for outputting reproduced audio signal d 'as audio
7 are provided.

The identification circuit 7 includes a header detector 71 for detecting a header of an identification code from the subtitle audio signal e ', a footer detector 72 for detecting a footer of the identification code from the subtitle audio signal e', and a set when the header is detected. And a flip-flop 73 reset when the footer is detected. That is, the classification signal h, which is the output signal of the flip-flop 73, indicates that “the subtitle signal is output in the subtitle audio signal e ′” from the time when the header is detected until the footer is detected.

The switching circuit 8 outputs the subtitle audio signal e 'to the subtitle signal a1 if the classification signal h indicates "the subtitle signal is being output in the subtitle audio signal e'", and outputs the classification signal h. Does not indicate that a subtitle signal is being output in the subtitle audio signal e ', the subtitle audio signal e' is output as the audio signal d1.

The delay circuit 9 delays the caption signal a1 for a predetermined time in order to remove the footer added to the caption signal. That is, the AND circuit 10 performs a logical AND operation on the classification signal h and generates a reproduced subtitle signal a ′ from which the footer has been removed.

Similarly, the delay circuit 14 delays the audio signal d1 for a predetermined time in order to remove the header added to the audio signal. In other words, the logical product circuit 15 performs a logical product of the negative signal and the negative logic of the classification signal h, thereby generating the reproduced audio signal d ′ from which the header has been removed.

Referring to FIG. 4, a character / video signal generating circuit 11 extracts a synchronizing signal from a video signal j 'to generate a screen display position and a reproduced subtitle signal a' which is a serial signal. A serial-to-parallel conversion circuit 113 for converting to a parallel signal, a screen display character storage circuit 114 for sequentially storing caption signals, which are character codes converted to parallel signals, and a screen display position signal from the synchronization signal separation circuit 111 An address counter 112 for counting addresses to be supplied to the screen display character storage circuit 114, and a character pattern (dot pattern) from a character code stored in the screen display character storage circuit 114 using the synchronization signal from the synchronization signal separation circuit 111 as an address. And a character pattern generation circuit 115 for generating.

The synchronizing signal separating circuit 111 detects the horizontal synchronizing signal and the vertical synchronizing signal, and uses an internal counter (not shown) to determine the screen position during drawing, that is, the horizontal position and the vertical character position. Output as needed. The address counter 112 determines an arbitrary screen position, matches the horizontal counter and the vertical counter in the synchronization signal separation circuit 111, and stores the character code output from the serial / parallel circuit 113 in the screen display character storage circuit 114. Write. The screen display character storage circuit 114 outputs a character code corresponding to the position of the screen specified by the synchronization signal separation circuit 111.

On the other hand, based on the screen display position signal from the synchronization signal separation circuit 111, the character pattern generation circuit 115
A character pattern is generated on the screen display image, and a subtitle video signal k is output.

Next, the operation of the above-described embodiment of the video reproducing apparatus of the present invention will be described with reference to the drawings.

Referring to FIG. 5, the video recording / playback device 6
The header detector 71 which has detected the header in the caption audio signal e 'reproduced by the above generates a pulse as the header detection signal f. If the initial state of the classification signal is "0", the flip-flop 73 is set by the pulse of the header detection signal f, and the classification signal h becomes "1". As a result, the output of the audio signal d1 from the switching circuit 8 is switched so that the subtitle signal a1 is output. When this is viewed from the caption signal a1, the header portion is cut off at the same time as the caption signal is extracted.

Next, the subtitle signal a1 and the audio signal d1 are delayed by the delay circuit 9 and the delay circuit 14, respectively, by the time required for the header or footer. Here, it is assumed that the header and the footer have the same size. The delayed subtitle signal a2 and the delayed audio signal d thus obtained
2 is ANDed with the classification signal h by AND circuits 10 and 14, respectively.

The footer detector 72 which has detected a footer in the caption audio signal e 'generates a pulse as the footer detection signal g. The flip-flop 73 is reset by the pulse of the footer detection signal g, and the classification signal h
Becomes “0”. As a result, the output of the subtitle signal a1 from the switching circuit 8 is switched so that the audio signal d1 is output.

When the classification signal h becomes "0" in accordance with the footer detection, the footer in the delayed subtitle signal a2 is removed by the AND circuit 10, and the reproduced subtitle signal a 'is output. The header in the delayed audio signal d2 is removed by the AND circuit 15, and the reproduced audio signal d 'is output.

In this way, a reproduced subtitle signal a 'and a reproduced audio signal d' can be obtained from the subtitle audio signal e 'in which the subtitle signal and the audio signal are mixed. The reproduced audio signal d 'is used by the audio generator 17 to generate audio. Since the reproduced subtitle signal a ′ is a character code, it is converted into a subtitle video signal k by the character video signal generation circuit 11 as described above. Whether or not the subtitle video signal k is actually displayed as a video can be switched by the switch 12. That is, unless the switch is turned off and the subtitle video signal k is given to the synthesizing circuit 13, the subtitle is not displayed on the video display device 16. Conversely, when the switch is turned on, the subtitle video signal k is given to the synthesizing circuit 13, and the subtitle is displayed on the video display device 16 so as to overlap the video.

As described above, according to the video recording apparatus and the video reproducing apparatus according to one embodiment of the present invention, the subtitle signal a and the audio signal d can be recorded as the subtitle audio signal e. By extracting the signal portion by the identification circuit 7, the audio signal d 'and the subtitle signal a' can be extracted. Further, whether or not to display the subtitle video can be switched by the switch 12, so that even when the subtitle is not displayed, the trace is not left.

[0039]

As is apparent from the above description, according to the present invention, an audio signal and a caption signal are superimposed and recorded in one signal, and the audio signal and the caption signal are separated during reproduction. With this configuration, display and non-display of subtitles can be switched so that traces of subtitles do not remain in the video. Also, with the simple circuit configuration, it is possible to simultaneously record and reproduce subtitles while recording and reproducing audio.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a video recording apparatus according to the present invention.

FIG. 2 is a diagram illustrating an operation of the video recording device according to one embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of an embodiment of a video playback device according to the present invention.

FIG. 4 is a diagram showing a configuration of a character video signal generation circuit in the video reproduction device according to one embodiment of the present invention.

FIG. 5 is a diagram illustrating an operation of the video reproduction device according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Video camera 2 Audio circuit 3 Subtitle insertion circuit 4 Identification code addition circuit 5 Switching circuit 6 Video recording / reproducing device 7 Identification circuit 8 Switching circuit 9 Delay circuit 10 Logical product circuit 11 Character video signal generation circuit 12 Switch 13 Synthesis circuit 14 Delay circuit Reference Signs List 15 AND circuit 16 Video display device 17 Audio generation device 71 Header detector 72 Footer detector 73 Flip-flop 111 Synchronization signal separation circuit 112 Address counter 113 Serial / parallel conversion circuit 114 Screen display character storage circuit 115 Character pattern generation circuit

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-62-239680 (JP, A) JP-A-57-169794 (JP, A) International publication 95/16990 (WO, A1) International publication 95/12198 ( WO, A1) (58) Field surveyed (Int. Cl. ⁶ , DB name) H04N 5/91-5/956

Claims (3)

(57) [Claims] 1. A caption generating means for generating a caption signal and a synchronizing signal, and an identification signal indicating a head part and an ending part in a head part and an end part of the caption signal in accordance with the synchronizing signal from the caption generating means, respectively. An identification code adding unit that generates a subtitle signal with an identification code by adding the subtitle signal with the identification code and an audio signal into one signal according to the synchronization signal from the subtitle generation unit to generate a subtitle audio signal A video recording apparatus, comprising: 2. A video unit reproducing means for reproducing a video signal, and the audio unit reproducing means for reproducing the shape <br/> curtain audio signal and a caption signal and the audio signal are combined into one signal, the audio Identification means for identifying a subtitle signal from the subtitle audio signal reproduced by the sub-reproduction means; separation means for separating a subtitle signal and an audio signal from the subtitle audio signal based on an identification result of the identification means; A subtitle video signal generating means for generating a video signal representing a subtitle from the subtitle signal thus obtained, and a subtitle video signal generated by the subtitle video signal generating means and a video signal reproduced by the video section reproducing means. claims, further comprising a synthesizing means
Item 2. The video recording device according to Item 1 . 3. A process according to claim, characterized by further comprising a switching means for switching whether to synthesize a video signal generated by the subtitle image signal generating means by said combining circuit
2. The video recording device according to item 2 .