JPH0918842A - Text signal decoding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the text signal decoding device which displays arbitrary characters, graphics, or the like independently of display and emission of video and sounds of teletext broadcasting and superposes arbitrary characters, graphics, or the like on an object picture to display them on the screen and emits arbitrary sounds. SOLUTION: A generation means 20 generates character information based on the teletext system used for television broadcasting where character information is multiplexed. Switching means 6 and 8 switch and output the video/sound signal of television broadcasting, the external video/sound signal, character information multiplexed with the video signal of television broadcasting, and character information from the generation means 20. When character information from the generation means 20 is designated as object character information by a control signal C, a control means 11 controls switching means 6 and 8 so that the external video/sound signal and character information from the generation means 20 are selected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a character multiplex signal decoding apparatus for decoding a television broadcast video signal in which information such as news and weather forecast is multiplexed as character information.

[0002]

2. Description of the Related Art Today, teletext programs are
Compared with the current television broadcasting, it has excellent characteristics such as occasional information acquisition, promptness, and selectivity. Therefore, various programs such as news, weather forecasts, stock market conditions, and traffic information are broadcast. In addition, special programs tailored to subtitle programs and events are also organized.

In such character multiplex broadcasting, information such as a still image composed of characters and simple figures is converted into a digital signal in the time gap of the broadcast wave, that is, in the vertical blanking period of the video signal. It is a system that superimposes and transmits, and at the receiving side, stores the received video signal in the memory, then converts it into a television signal and displays it on the television receiver, which is internationally called teletext. .

The form of the receiver for receiving the character multiplex broadcasting is as follows.
It is roughly classified into three types: a television receiver built-in type (hereinafter referred to as a television built-in type), an independent adapter type, and a connection adapter type. The built-in television type has a configuration in which a character multiplex signal decoding device is incorporated in a television receiver, which enables a rational design of the entire receiver and easily realizes high-quality images. The independent adapter type is composed of a TV tuner, an encoder that modulates a composite character signal into an NTSC signal, and a high frequency modulator in addition to a character multiplex signal decoding device, and has the advantage that it can be connected to a television receiver with only an antenna input terminal. is there. The connection adapter type is
Basically, it is composed only of a character multiplex signal decoding device having the same function as the built-in television type, and since it is connected to the television receiver via a connector, the same image quality as the built-in television type can be obtained.

A character multiplex signal decoding apparatus used in a character multiplex broadcasting receiver as described above, for example, as shown in FIG. 3, is a channel selection circuit 53 to which broadcast radio waves received by an antenna 52 are supplied, An audio demodulation / amplification circuit 54, a luminance demodulation / color demodulation circuit 55, and a teletext decoder 51 to which outputs of the channel selection circuit 53 are respectively supplied, and an audio signal generation /
The audio switching circuit 5 to which the outputs of the amplifier circuit 60, the audio demodulation / amplification circuit 54, and the teletext decoder 51 are supplied.
8, a video switching circuit 56 to which outputs of the luminance demodulation / color demodulation circuit 55 and the teletext decoder 51 are supplied, and an audio output circuit 5 to which outputs of an audio switching circuit 58 are supplied.
9 and a video output circuit 57 to which the output of the video switching circuit 56 is supplied.

Further, the teletext decoder 51 is adapted to be supplied with a control signal C from the outside, and the teletext decoder 51 works with a sampling circuit 512 to which the output of the channel selection circuit 53 is supplied. R for storage and teletext storage
AM (Random Access Memory) 5
13 and a ROM (Read On
ly Memory) 514, a character generator 518,
An additional sound decoder 517 for outputting to the voice switching circuit 58 and a display memory 515 for storing a display image.
And a video switching circuit 56 connected to the display memory 515.
Display processing circuit 515 for outputting to
And a microprocessor 511 for controlling the operation of the entire apparatus according to the program and the control signal C stored in.

In the receiver with built-in television as described above, first, the channel selection circuit 53 selects a predetermined channel of the broadcast radio waves received by the antenna 2, and the video signal corresponding to the channel is the luminance signal. The audio signal corresponding to the above-mentioned channel is supplied to the audio switching circuit 58 via the audio demodulation / amplification circuit 54 while being supplied to the video switching circuit 56 via the demodulation / color demodulation circuit 55 and the sampling circuit 512. It

The sampling circuit 512 extracts only teletext data from the video signal from the channel selection circuit 53. The additional sound decoder 517 converts the additional sound data included in the teletext data obtained by the sampling circuit 512 into an audio signal and supplies the audio signal to the audio switching circuit 58. Character generator 518
Converts the character code included in the teletext data obtained by the sampling circuit 512 into a display image and supplies the display image to the display processing circuit 516. The display processing circuit 516 writes the display image from the character generator 518 to the display memory 515 and repeatedly reads the written display image in synchronization with the television scanning. The display image read from the display memory 515 by the display processing circuit 516 is supplied to the video switching circuit 56 as a video signal.

The video switching circuit 56 switches the video signal from the luminance demodulation / color demodulation circuit 55 and the video signal from the display processing circuit 516 of the teletext decoder 51, or mixes the supplied video signals. Output through the video output circuit 57.

On the other hand, the voice signal generating / amplifying circuit 60 generates a voice signal based on the control of the microprocessor 511, amplifies the generated voice signal, and the voice switching circuit 58.
To supply.

The voice switching circuit 58 generates / generates a voice signal.
Audio signal from amplifier circuit 60, audio demodulation / amplification circuit 54
From the additional sound decoder 517 of the teletext decoder 51 are switched and output via the audio output circuit 59.

The video signal and the audio signal obtained as described above are respectively supplied to a display device and a speaker (not shown). Therefore, in the above display device,
An image in which characters and figures based on the character code of teletext data are inserted and superimposed is displayed.
The sound in which the additional sound based on the additional sound data of the teletext data is inserted is output.

[0013]

However, the above-described character multiplex signal decoding apparatus which is generally used at present functions only for the character broadcast data by the character multiplex broadcast program multiplexed on the television broadcast radio wave. Data other than this teletext data,
For example, it cannot function for data created by a user for the purpose of displaying and displaying arbitrary characters, figures, voices, and the like.

That is, the conventional character multiplex signal decoding device does not have means for directly inputting other character data in addition to the character broadcast data of the character multiplex broadcast program. For this reason, for example, the user can use a character as a means of video editing such as inserting a desired title screen, superimposing subtitles, and inserting sound on an image and sound obtained by shooting with a video camera or the like. The multiplex decoding device could not be applied, and in addition to the viewing of the character multiplex broadcast, the image and the sound obtained by the above video editing could not be viewed.

Therefore, the present invention has been made in view of the above-mentioned conventional circumstances, and has the following objects.

That is, the object of the present invention is to display any character or figure separately from the display and display of video and audio by character multiplex broadcasting, and to display any character or figure as an object image. It is an object of the present invention to provide a character multiplex signal decoding device that can be superimposed on the screen and displayed on the screen, and that can display arbitrary voice.

[0017]

In order to solve the above-mentioned problems, a character multiplex signal decoding apparatus according to the present invention uses a character multiplex system to decode character information from a television broadcast video signal. Is a character multiplex signal decoding device for extracting and reproducing a reproduction signal from the video signal of the television broadcast and the video signal obtained from the character information, and generating the character information based on the character multiplex system. Generating means, input means for inputting a video signal, first switching means for switching and outputting the video signal of the television broadcast and the video signal input by the input means, and the video signal of the television broadcast Second switching means for switching and outputting the character information multiplexed to the character information and the character information generated by the generating means, and a designation for designating the target character information. Comprising stages and, and control means for respectively controlling the switching operation of said first switching means and second switching means on the basis of the designation information of the specified unit. The control means selects the video signal input by the input means when the character information generated by the generation means is designated as the target character information by the designation means. The switching means is controlled, and the second switching means is controlled so as to select the character information generated by the generating means.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

First, a character multiplex signal decoding apparatus according to the first embodiment of the present invention will be described.

The character multiplex signal decoding device is constructed, for example, as shown in FIG. That is, the character multiplex signal decoding device 100 includes a channel selection circuit 3 to which the television broadcast radio wave received by the antenna 2 is supplied, an audio demodulation / amplification circuit 4 to which the output of the channel selection circuit 3 is supplied, and a luminance demodulation. / Color demodulation circuit 5 and teletext decoder 1
An audio signal generation / amplification circuit 10, an audio signal generation / amplification circuit 10, an audio switching circuit 8 to which outputs of the audio demodulation / amplification circuit 4 and the teletext decoder 1 are supplied, and a luminance demodulation / color demodulation circuit 5 and the video switching circuit 6 to which each output of the teletext decoder 1 is supplied, the audio output circuit 9 to which the output of the audio switching circuit 8 is supplied, and the video output circuit 7 to which the output of the video switching circuit 6 is supplied. Is equipped with.

The teletext decoder 1 is supplied with a control signal C from the outside. The teletext decoder 1 has a sampling circuit 12 to which the output of the channel selection circuit 3 is supplied and a RAM. (Random Access
Memory 13 and ROM (Read Only)
Memory) 14, a character generator 18, an additional sound decoder 17 for outputting to the voice switching circuit 8, a display memory 515, and a display processing circuit 15 connected to the display memory 515 and outputting to the video switching circuit 6. And a microprocessor 11 for controlling the operation of the entire apparatus.

Here, in the present embodiment, the video switching circuit 6 and the audio switching circuit 8 are supplied with video signals and audio signals from the outside (hereinafter referred to as external video signals and external audio signals), respectively. Has been done. Further, the teletext decoder 1 includes an interface circuit 19, and the interface circuit 19 is connected to an external character data generating means 20.

The respective constituents of the character multiplex signal decoding apparatus 100 having the above-described structure will be specifically described below.

A program for controlling the operation of the entire device is stored in the ROM 14, and the microprocessor 11 stores the program stored in the ROM 14,
And the operation of the entire device according to a control signal C supplied from the outside. The RAM 13 is a working memory of the microprocessor 11 and also a memory for temporarily storing teletext data described later.

First, a case of processing a character multiplex broadcast received by the antenna 2 (hereinafter referred to as a character broadcast mode) will be described.

In this case, the microprocessor 11
Recognizes from the control signal C given from the outside that the data to be processed is the teletext data of the teletext broadcast received by the antenna 2, and controls the entire apparatus to operate in the teletext mode. .

Under the control of the microprocessor 11, the tuning circuit 3 selects a predetermined channel of the television broadcast radio waves received by the antenna 2 and amplifies the luminance of the video signal corresponding to the selected channel. In addition to supplying each to the color demodulation circuit 5 and the sampling circuit 12, the audio signal corresponding to the above channel is supplied to the audio demodulation / amplification circuit 4.

Here, the channel selected by the tuning circuit 3 is the character multiplex broadcasting channel as described above. That is, during the vertical blanking period of the video signal supplied to the luminance amplification / color demodulation circuit 5 and the sampling circuit 12, respectively,
Text broadcasting data is superimposed by a text multiplexing method to which a hybrid method is applied.

In the character multiplex system to which this hybrid system is applied, teletext data is composed of synchronous data and data packets, and the data packet includes a prefix used for data identification and transmission control, a data block, and an error correction. Check mark is added. The data block includes character codes corresponding to characters and figures, and additional sound data corresponding to music and sound effects. In addition, the character multiplex broadcast program data (hereinafter referred to as program data) corresponds to one screen.
Consisting of one or more page data and program management data,
Each of these is composed of a data block as described above.

Therefore, under the control of the microprocessor 11, the sampling circuit 12 extracts only the teletext data from the video signal from the channel selection circuit 3 and stores the extracted teletext data in the RAM 13.

Under the control of the microprocessor 11, the additional sound decoder 517 decodes the additional sound data contained in the teletext data stored in the RAM 13 and supplies it to the audio switching circuit 8 as an additional sound.

The character generator 518 is, for example, the JIS first
Characters and symbols including level kanji, photographic figures,
Geometric figures and mosaic figures can be generated. Characters and figures corresponding to character codes included in the teletext data stored in the RAM 13 are generated, and the generated characters and figures are displayed. The display image is supplied to the display processing circuit 516.

The display processing circuit 16 sequentially writes the display image from the character generator 518 to the display memory 15, and under the control of the microprocessor 11, the display image written to the display memory 15 is repeated in synchronization with the television scanning. Read out. The display image read from the display memory 515 by the display processing circuit 516 is supplied to the video switching circuit 56 as a video signal.

The voice demodulation / amplification circuit 4 demodulates and amplifies the voice signal from the channel selection circuit 3. Then, the audio demodulation / amplification circuit 4 supplies the audio signal thus demodulated and amplified to the audio switching circuit 8.

The brightness amplification / color demodulation circuit 5 amplifies the brightness of the video signal from the channel selection circuit 3 and demodulates the color component of the video signal. Then, the brightness amplification / color demodulation circuit 5
Supplies the video signal subjected to the brightness amplification and color demodulation processing to the video switching circuit 56.

Here, in this case, the voice switching circuit 8 is controlled by the microprocessor 11, and the voice signal from the voice demodulation / amplification circuit 4 and the addition from the additional sound decoder 517 of the teletext decoder 1 are added. The sound is switched and output through the audio output circuit 9.

Similarly to the audio switching circuit 8, the video switching circuit 56 is also controlled by the microprocessor 11 so that the video signal from the luminance amplification / color demodulation circuit 5 and the display processing circuit 16 of the teletext decoder 1 are transmitted. The video signals are switched or output in a mixed format of these video signals via the video output circuit 7.

Therefore, the video output circuit 7 outputs a character or graphic based on the character code of the teletext data, and a reproduced video signal of an image on which the character or graphic is superimposed, and the audio output circuit 9 outputs. , A voice corresponding to the reproduced video signal, and a reproduced voice signal of voice based on the additional sound data of the teletext data are output.

Next, the case of processing the character data provided by the external character data generating means 20 (hereinafter referred to as the external mode) will be described.

That is, in the present embodiment, the character broadcasting decoder 1 has a path 21 for character data supplied from the character data generating means 20 provided outside the apparatus, and this path 21 serves as the interface circuit 19. It is configured to be connected to the microprocessor 11 via the.

The character data generated by the character data generating means 20 is the same as the character broadcast data extracted by the sampling circuit 12 from the video signal of the channel selected by the channel selection circuit 3 in the character broadcast mode described above. The data is based on the method, that is, the character multiplex method to which the above-described hybrid method is applied. The audio switching circuit 8 is supplied with an external audio signal from outside the device, and the video switching circuit 6 is supplied with an external video signal from outside the device. With respect to the external video signal and the external audio signal, the character data generating means 20 generates character data such as required characters, figures, and voice.

Further, the microprocessor 11 recognizes that the data to be processed is the character data generated by the character data generating means 20 by the control signal C given from the outside of the device, and operates in the external mode. To control the entire device. Then, the microprocessor 11, for example, with respect to the character data generating means 20,
"License data transfer permission", etc.
Reply via 9. As a result, the character data generating means 20 supplies the character data to the character broadcast decoder 1 via the interface circuit 19.

The teletext decoder 1 extracts character codes and additional sound data from the text data supplied from the text data generating means 20 via the interface circuit 19 in the same manner as in the teletext mode. And so on. The additional sound obtained from the character data by the teletext decoder 1 is supplied to the audio switching circuit 8, and the video signal obtained from the character code by the teletext decoder 1 is supplied to the video switching circuit 6. .

Since a series of processing operations for the character data in the teletext decoder 1 are similar to the processing operations for the text data in the teletext mode described above, detailed description thereof will be omitted.

In this case, the voice switching circuit 8 is obtained from the above-mentioned external voice signal and the character data from the character data generating means 20 by the character broadcast decoder 1 under the control of the microprocessor 11. The additional sound is switched and output via the audio output circuit 9.

Similarly to the audio switching circuit 8, the video / video switching circuit 56 is controlled from the external video signal and the character data from the character data generating means 20 by the character broadcasting decoder 1 under the control of the microprocessor 11. The obtained video signals are switched or output through the video output circuit 7 in a format in which these video signals are mixed.

Therefore, the video output circuit 7 outputs a reproduced video signal of a desired character or graphic, and a reproduced video signal in which the character or graphic is superimposed on the image based on the external video signal. The audio output circuit 9 outputs the audio corresponding to the reproduced video signal and the reproduced audio signal of the required audio.

As described above, in the present embodiment, in addition to the teletext data by the teletext, the above-mentioned teletext can be obtained only by adding a slight function expansion to the interface circuit 19 and the configuration of the conventional multi-character signal decoding apparatus. Character data generated in the same way as data can be directly input. Therefore, it is possible to perform an editing process of inserting and superimposing desired characters, figures, voices, and the like on the target video signal and audio signal.

Next, a character multiplex signal decoding apparatus according to the second embodiment of the present invention will be described.

The character multiplex signal decoding device is applied to, for example, a television receiver 33 with a character broadcast receiver as shown in FIG.

That is, a television receiver with a built-in teletext receiver (hereinafter, simply referred to as a TV receiver) 33 is supplied with the above-described character multiplex signal decoding apparatus 100 and the output of the character multiplex signal decoding apparatus 100. Monitor 3
31. Further, the character multiple signal decoding device 100 is supplied with the respective outputs of the video / audio signal means 31 and the character data generating means 20 provided outside the device. Further, the output of the character multiplex signal decoding device 100 is supplied to a recording device 35 provided outside the device.

The video / audio signal means 31 is composed of, for example, a video camera, and the video and audio signals obtained by shooting the character multiplex signal decoding device 10 of the TV receiver 33.
Supply 0. At the same time, the character data generating means 20
Is any character, figure, and sound, for example, the required title screen and subtitles for the image and sound obtained by the video camera, and character data such as sound is generated by the character multiplex method described above, and the generated character is generated. The data is supplied to the character multiplex signal decoding device 100.

The character multiplex signal decoding apparatus 100 is similar to the first embodiment described above in that the video / audio signal means 3 is used.
The video signal and the audio signal from No. 1 are subjected to the insertion and superimposition processing of characters and figures based on the character data from the character data generation means 20, and the superimposing processing, and the video signal subjected to the insertion and superimposing processing. After editing the audio signal, the monitor device 331 and the external recording device 3 are used as a video signal and an audio signal.
5

The monitor device 331 is, for example, a CRT (C
The monitor device 331 monitors the image and sound based on the edited video signal and audio signal from the character multiplex signal decoding device 100.

The recording device 35 comprises, for example, a video tape recorder, and records the edited video signal and audio signal from the character multiplex signal decoding device 100 in a recording medium (not shown) in a predetermined format.

Further, in the TV receiver 33, a predetermined channel of the television broadcast radio wave received by the antenna 2, for example, a channel of a character broadcast, is converted into a video signal of the channel by the character multiplex signal decoding device 100. Characters and figures based on superimposed teletext data,
And audio is inserted and superimposed, and the video signal and audio signal subjected to the insertion and superposed processing are displayed on the monitor device 3.
31 and an external recording device 35.

Therefore, the monitor device 331 monitors the image and the sound based on the video signal and the sound signal received from the teletext channel received by the antenna 2. Further, the recording device 35 records the video signal and the audio signal obtained from the teletext channel on a recording medium (not shown) in a predetermined format.

As described above, since the TV receiver of this embodiment incorporates the character multiplex signal decoding apparatus 100 of the first embodiment described above, it can be used by a video camera or the like in addition to viewing character broadcasts. It is possible to perform video editing in which a required title screen, subtitles, and audio are inserted and superimposed on the image and audio obtained by shooting, and the video-edited image and audio can be viewed.

Further, since it is possible to develop the display and display functions of characters, figures, and sounds on the television receiver and directly interface with the character broadcasting data format, it is possible to perform communication, package, etc. in addition to television broadcasting. Data can be supplied via the media.

[0060]

In the character multiplex signal decoding apparatus according to the present invention, the generating means generates the character information based on the character multiplex method used for television broadcasting in which the character information is multiplexed. The input means inputs a video signal. The first switching means switches and outputs the video signal of the television broadcast and the video signal input by the input means. The second switching means switches and outputs the character information multiplexed in the video signal of the television broadcast and the character information generated by the generating means. The designation means designates the target character information. The control means includes the first switching means and the second switching means based on the designation information of the designation means.
The switching operation of the switching means is controlled respectively, and when the character information generated by the generating means is designated as the target character information by the designating means, the video signal input by the input means is selected. The first switching means is controlled, and the second switching means is controlled so as to select the character information generated by the generating means. Thereby, in addition to the character information multiplexed in the video signal of the television broadcast, it is possible to directly input arbitrary character information generated by the same method as the character information. Therefore, for the target video signal and audio signal,
It is possible to perform an editing process of inserting and superimposing a required title screen, subtitles, audio, and the like. Therefore, it is possible to view the teletext and also to view the image and the sound in which the required title screen, subtitles, sound and the like are inserted and superimposed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a character multiplex signal decoding device according to the present invention.

FIG. 2 is a block diagram showing a configuration of a television receiver built-in teletext receiver to which the above character multiplex signal decoding device is applied.

FIG. 3 is a block diagram showing a configuration of a conventional character multiplex signal decoding device.

[Explanation of symbols]

 1 ... Teletext decoder 2 ... Antenna 3 ... Channel selection circuit 4 ... Audio demodulation / amplification circuit 5 ... Luminance amplification / color demodulation circuit 6 ... Video switching circuit 7 ... Video Output circuit 8 ・ ・ ・ Voice switching circuit 9 ・ ・ ・ Voice output circuit 10 ・ ・ ・ Voice signal generation / amplification circuit 11 ・ ・ ・ Microprocessor 12 ・ ・ ・ Extraction circuit 13 ・ ・ ・ RAM 14 ・ ・ ・ ROM 15 ・..Display memory 16 ... display processing circuit 17 ... additional sound decoder 18 ... character generation circuit 19 ... interface 20 ... character data generation means 100 ... character multiplex signal decoding device

Claims (1)

[Claims] 1. A character signal is extracted from a video signal of a television broadcast in which character information is multiplexed using a character multiplexing method, and a reproduction signal is obtained from the video signal of the television broadcast and the video signal obtained from the character information. Is a character multiplex signal decoding device for generating and outputting, and a generation means for generating character information based on the character multiplex system, an input means for inputting a video signal, a video signal of the television broadcast and the input First switching means for switching and outputting the video signal input by the means, and second switching means for switching and outputting the character information multiplexed in the video signal of the television broadcast and the character information generated by the generating means. Switching means, designating means for designating target character information, and the first switching means and the second switching means based on the designation information of the designating means. Control means for controlling the switching operation of each stage, the control means being input by the input means when the character information generated by the generating means is designated as the target character information by the designating means. Character switching signal for controlling the first switching means so as to select the video signal and the second switching means for selecting the character information generated by the generating means. Decoding device.