JPH0951511A - Teletext broadcasting receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct an error by utilizing relative information on a phrase and a word by dividing a character data part of a teletext signal of teletext broadcasting into phrases and words. SOLUTION: A character signal processing part 2 extracts a signal of teletext broadcasting from a received video signal and decodes it into a digital teletext signal. A character division part 5 extracts only a part corresponding to character data from a data unit discriminated as character data with data unit discrimination parameters. A dictionary part 6 has relative information on a variety of words and data on examples in addition to information on phrases and words and they can be used to correct errors of wrong words. On the basis of the information on the divided words and phrases, processings for speech conversion and error correction are performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a character multiplex broadcasting receiver for detecting a character multiplex broadcasting signal multiplexed on a video signal and displaying it on a screen.

[0002]

2. Description of the Related Art A character multiplex broadcasting receiver for receiving character multiplex broadcasting multiplexed in a vertical blanking period of a video signal is generally known. FIG. 8 is a block diagram showing the configuration of a conventional teletext receiver.

In the figure, 1 is a tuner, 2 is a character signal processing unit, 3 is a character / graphic conversion unit, and 4 is an antenna. The tuner 1 selected to an appropriate channel receives the video signal of that channel from the antenna 4. The character signal processing unit 2 extracts a digital character multiplex signal from the video signal and encodes it. The character / graphic conversion unit 3 converts the character data and the graphic data of the character multiplex signal as a video signal. Then, each data is output to a display unit (not shown).

FIG. 9 is an explanatory view showing a signal system of a conventional character multiplex broadcasting. The character multiplex broadcasting signal is a horizontal scanning period (14th to 16th H, which has a vertical blanking period of the video signal).
21H), and one program is transmitted by a signal multiplexed in the same horizontal scanning period. The data line transmitted in one horizontal scanning period is composed of a 296-bit digital signal. A clock run-in signal (CR) for obtaining bit synchronization and a framing code signal (FC) for obtaining byte synchronization are present at the head of the data line, and the other portion is called a data packet. The data packet is basically protected from errors by the check code. The part of the data packet excluding the check code is divided into a prefix and a data block, and a plurality of data blocks are collected to form a data group. The data group is divided into a data group header and data group data, and the data group data is composed of a page data header and a data unit.

The data system transmitted by the character multiplex broadcasting includes character data, graphic data, and additional sounds. An identification parameter such as whether the data of the data unit is character data, graphic data, or additional sound is transmitted to the first 2 bytes of the data unit, and according to the identification parameter, Performing each processing, character multiplex signal screen,
Create additional sounds.

The error correction in the character signal processing unit 2 is
This is done by the check code of each data packet. In addition, a CRC added after the data unit, etc.
(Cyclic Redundancy Check)
Error detection is performed by the code. The error detection by the CRC code can be effectively performed even when there is an uncorrectable error in the data packet unit error correction or a data packet loss. However, except for the mode in which the received data is sequentially displayed, the data unit having the error is discarded and basically no screen display is performed.

[0007]

Since the conventional teletext broadcasting receiver is constructed as described above, the morphological element is used without dividing the data portion of the character into morphological elements such as clauses and words. Could not be processed.

Further, in the conventional character multiplex broadcasting receiver, when the data of the additional sound is present in the character multiplex signal,
A sound is produced according to the additional sound data, but in other cases, music or voice is not output, and the contents of the broadcast cannot be understood unless the user looks at the screen.

Further, when the received character multiplex signal data has an error, the conventional character multiplex broadcasting receiver does not display and displays nothing until the correct error-free data can be received. However, there was a problem that there was a lot of time waiting for display.

The present invention has been made in order to solve the above-mentioned problems. The character data portion of the character multiplex broadcasting is divided into morphological elements such as clauses and words, and the character multiplex broadcasting is converted into voice. An object of the present invention is to obtain a character multiplex receiver that outputs and can receive and display even if there is an error in the received character multiplex broadcast data.

[0011]

A character multiplex broadcasting receiver according to the present invention includes a character signal processing unit for detecting and decoding a character multiplex broadcasting signal from a video signal, and a character multiplex signal decoded by the character signal processing unit. And a character dividing unit for dividing the character data portion of the signal into morphological elements of clauses or words.

Further, a character signal processing unit for detecting and decoding a character multiplex broadcasting signal from a video signal and a character data portion of the character multiplex signal decoded by the character signal processing unit are divided into morphological elements of clauses or words. A character dividing unit, a voice converting unit that converts the divided morphological elements into a voice signal, and a voice output unit that outputs a voice are provided.

Further, a character signal processing unit for detecting and decoding a character multiplex broadcasting signal from a video signal and a character data portion of the character multiplex signal decoded by the character signal processing unit are divided into morphological elements of clauses or words. A character division unit, a voice conversion unit that converts the divided morphological elements into a voice signal, a voice output unit that outputs voice, a character / graphics processing unit that converts a character multiplex signal into a character image, and a character image or video signal. And a screen display unit for displaying on the screen.

Further, a character signal processing unit for detecting and decoding a character multiplex broadcasting signal from a video signal, and a character data portion of the character multiplex signal decoded by the character signal processing unit are divided into morphological elements of clauses or words. It is provided with a character division unit and an error correction unit that estimates and corrects a character at an erroneous position from the divided morphological elements before and after the character data portion of the character multiplex signal.

Furthermore, a character signal processing unit for detecting and decoding a character multiplex broadcasting signal from a video signal, and a storage means for selecting a character data portion from the decoded character multiplex signal and storing a data string of the character data. It is equipped with and.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION In a character multiplex broadcasting receiver which is an embodiment of the present invention, a video signal is received, a character multiplex signal multiplexed with the video signal is extracted, and a character data portion of the character multiplex signal is extracted. Split into morphological elements of clauses or words.

Further, the video signal is received, the character multiplex signal multiplexed with the video signal is extracted, the character data portion of the character multiplex signal is divided into morphological elements of clauses or words, and the divided morphological elements are voiced. Converted to and output.

Further, the video signal is received, the character multiplex signal multiplexed with the video signal is extracted, the character data portion of the character multiplex signal is divided into morphological elements of clauses or words, and the divided morphological elements are voiced. It is converted to and output, and the screen of the character multiplex signal is also output.

Further, the video signal is received, the character multiplexed signal multiplexed in the video signal is extracted, the character data portion of the character multiplexed signal is divided into morphological elements of clauses or words, and if there is an error in the character data portion, , Estimate and correct the error from the surrounding clauses and words.

Furthermore, the video signal is received, the character multiplex signal multiplexed with the video signal is extracted, and the character data portion of the character multiplex signal is stored.

The present invention will be described in detail below with reference to the drawings showing the embodiments thereof.

Embodiment 1. 1 is a block diagram showing an outline of a character multiplex broadcast receiver which is Embodiment 1 of the present invention. In the figure, 1 is a tuner, 2 is a character signal processing unit, 4 is an antenna, 5 is a character dividing unit, and 6 is a dictionary unit.

Next, the operation will be described. Tuner 1
A proper channel is selected by and the video signal of that channel is received from the antenna 4. The character signal processing unit 2 extracts a character multiplex broadcast signal from the received video signal and decodes it into a digital character multiplex signal.

The 2-byte data unit identification parameter transmitted at the beginning of the data unit shown in FIG. 9 can identify whether the data unit is character data, graphic data, or additional sound. . The character dividing unit 5 extracts only the portion corresponding to the character data of the data unit identified as the character data by the data unit identification parameter. The extracted character data portion naturally includes not only the code representing the character but also the code such as the character size and space. When a code such as the size of a character or a space is present in the middle, the code up to that code is regarded as one clause. The other parts are divided into bunsetsu and words based on the bunsetsu and word information stored in the dictionary unit 6. The dictionary unit 6 has related information of various words and data of examples in addition to the information of clauses and words, and can be used when converting characters into voices and correcting errors in wrong words.

In this way, it is possible to perform processing such as voice conversion and error correction based on the information of the divided words and phrases.

It should be noted that even a receiver of another data broadcast utilizing the character multiplex broadcasting standard may have the same effect as long as the data broadcast transmits a character code as data.

Embodiment 2. 2 is a block diagram showing an outline of a character multiplex broadcast receiver according to a second embodiment of the present invention. In the figure, 1 is a tuner, 2 is a character signal processing unit, 3 is a character / graphics processing unit, 4 is an antenna, 5 is a character dividing unit, 6 is a dictionary unit, 7 is a voice converting unit, and 8 is a speaker.

Next, the operation will be described. Tuner 1
A proper channel is selected by and the video signal of that channel is received from the antenna 4. The character signal processing unit 2 extracts a character multiplex broadcast signal from the received video signal and decodes it into a digital character multiplex signal. The decoded character multiplexed signal is converted in the character / graphics processing unit 3 from a digital code to a signal system that can be displayed on the screen.

The 2-byte data unit identification parameter transmitted at the beginning of the data unit shown in FIG. 9 can identify whether the data unit is character data, graphic data, or additional sound. . The character dividing unit 5 extracts only the portion corresponding to the character data of the data unit identified as the character data by the data unit identification parameter. The extracted character data portion naturally includes not only the code representing the character but also the code such as the character size and space. When a code such as the size of a character or a space is present in the middle, the code up to that code is regarded as one clause. The other parts are divided into bunsetsu and words based on the bunsetsu and word information stored in the dictionary unit 6. The character data portion is converted into a voice in the voice conversion unit 7 by using the information of the divided clauses and words.

The functions of the character dividing unit 5, the dictionary unit 6 and the voice converting unit 7 will be described with reference to the explanatory view of FIG. First, using the information of the dictionary unit 6, the character dividing unit 5 divides a sentence into words. For example, the sentence "reading a book" can be divided into the phrases "book" and "reading", and can be further divided into the words "book", "wo", and "reading". The voice conversion unit 7 can specify the pronunciation of each word, and sets an accent at an appropriate position. In this case, it becomes the “ho” part of the “book”. Then, it is output as sound from the speaker 6.

As described above, since the character data portion of the character multiplex signal is output as voice, there is an effect that the contents of the character broadcast can be understood even when the screen is not viewed.

Note that other data broadcasting receivers using the character multiplex broadcasting standard only need to transmit a character code as data, and the same effect is exhibited.

Embodiment 3 In the second embodiment, the character multiplex broadcasting receiver for converting the character data of the character multiplex broadcasting data into the voice is shown, but the character multiplex broadcasting receiver integrated with the television receiver simultaneously displays the character multiplex broadcasting screen. May be.

FIG. 4 is a block diagram showing the configuration of the character multiplex broadcast receiver according to the third embodiment. In the figure, 9 is a display, 10 is a video signal processing unit, 11 is an audio signal processing unit, and 12 and 13 are changeover switches. Others are the same as in the case of FIG. 2, and the description will be omitted.

Next, the operation will be described. Tuner 1
A proper channel is selected by and the video signal of that channel is received from the antenna 4. In the character signal processing unit 2, a character multiplex broadcasting signal is extracted from the received video signal and decoded into a digital character multiplex signal. The decoded character multiplexed signal is converted by the character / graphics processing unit 3 into a signal system that can be displayed on the display 9. The video signal processing unit 10 processes the video signal so that it can be displayed on the screen, and the audio signal processing unit 11 processes the audio signal included in the video signal.

The 2-byte data unit identification parameter transmitted at the beginning of the data unit shown in FIG. 9 can identify whether the data unit is character data, graphic data, or additional sound. . The character dividing unit 5 extracts only the portion corresponding to the character data of the data unit identified as the character data by the data unit identification parameter. The extracted character data portion naturally includes not only the code representing the character but also the code such as the character size and space. When a code such as the size of a character or a space is present in the middle, the code up to that code is regarded as one clause. The other parts are divided into bunsetsu and words based on the bunsetsu and word information stored in the dictionary unit 6.

Then, similarly to the second embodiment, the character data portion is converted into voice in the voice conversion unit 7, and is input to the changeover switch 13 together with the output of the voice signal processing unit 11. The speaker 6 is output by the output of the changeover switch 13.
Outputs a voice.

The output of the character / graphics processing unit 3 is input to the changeover switch 12 together with the output of the video signal processing unit 10. The output of the changeover switch 12 is input to the display 9 and the screen is displayed. By setting the changeover switches 12 and 13, four kinds of combinations of video and audio can be selected. For example, while watching a video signal, it is possible to listen to information on the character multiplex broadcasting by voice.

Although the video signal and teletext screens and the video signal audio and teletext audios are switched and displayed here, the videos may be divided into screens and displayed simultaneously, or dual audio may be displayed. For example, the voice may be output at the same time.

Further, even a receiver of another data broadcast using the character multiplex broadcasting standard may have the same effect as long as the data broadcast transmits a character code as data.

Embodiment 4 FIG. Since error correction is performed on the data of the character multiplex signal of the character multiplex broadcasting, the data can be corrected even if there is some error in the data. However, if there is an error beyond the capability of error correction, the data part will be discarded without being displayed on the screen, and the same data will be waited for anew,
It takes time to display the screen. Therefore, in the case of character data, it is advisable to correct and display the character that seems to be correct using the characters and context before and after the location where the error occurred.

FIG. 5 is a block diagram showing the configuration of a teletext receiver according to a fourth embodiment of the present invention. In the figure, 3 is a character / graphics processing unit, and 14 is an error correction unit for detecting an error in the data of a character multiplex signal. Others are the same as in the case of the character multiplex broadcasting receiver of FIG. 1, and the description will be omitted.

Next, the operation will be described. Tuner 1
Selects an appropriate channel and receives the video signal of that channel. In the character signal processing unit 2, a character multiplex broadcasting signal is extracted from the received video signal and decoded into a digital character multiplex signal.

The 2-byte data unit identification parameter transmitted at the beginning of the data unit shown in FIG. 9 can identify whether the data unit is character data, graphic data, or additional sound. . The character dividing unit 5 extracts only the portion corresponding to the character data of the data unit identified as the character data by the data unit identification parameter. The extracted character data portion naturally includes not only the code representing the character but also the code such as the character size and space. When a code such as the size of a character or a space is present in the middle, the code up to that code is regarded as one clause. The other parts are divided into bunsetsu and words based on the bunsetsu and word information stored in the dictionary unit 6.

The error correction unit 14 uses the information in the dictionary unit 6 to correct the location where an error has occurred. If an error is detected by the processing in the character signal processing unit 2, which data packet has an error can be specified from the error correction result performed for each data packet. The dictionary unit 6 has related information of various words and data of examples in advance,
From the characters and phrases before and after the errored data packet, the characters and phrases in the data packet are checked and corrected to the characters and phrases that are considered to be correct. Then, the data is output to the character / graphic processing unit 3, converted into a signal that can be displayed on the screen, and output.

The functions of the character division unit 5, the dictionary unit 6, and the error correction unit 14 will be described with reference to the explanatory view of FIG. For example, suppose there is a series of clauses "Sakura blooms in April."
This clause is transmitted by the character multiplex broadcasting and is received by the character multiplex receiver. At this time, suppose that the data had an error for some reason, resulting in the phrase series "Sakuragaku in April." The dictionary unit 6 holds information such as “enroll, cherry blossoms, ...” As related information for the word “April”. In addition, "bloom, scatter ..."
Estimate the missing character by holding relevant information such as. Two
By adopting "bloom" as a common word for the two words "April" and "Sakura", the missing letters can be corrected to "Saki".

In this way, the correct character or phrase in the erroneous portion is estimated and corrected from the preceding or following character or phrase, so that even if there is an error, the data can be displayed without being discarded and the display The waiting time can be reduced.

It should be noted that even a receiver of another data broadcast using the character multiplex broadcasting standard will suffice as long as the data broadcast transmits a character code as data, and the same effect is exhibited.

Embodiment 5. In the case of the first to fourth embodiments, the data unit of character data in the character multiplex signal is used for processing. However, a part such as program management and a part of character data in the character multiplex signal are selected in advance. Then, if it is stored and read out when necessary, processing with a short waiting time becomes possible.

FIG. 7 is a block diagram showing the configuration of a character multiplex broadcast receiver according to a fifth embodiment of the present invention. In the figure, reference numeral 15 is a storage unit for selecting and storing a necessary portion of the character multiplex signal. The other parts are the same as those in the second embodiment, and the description thereof is omitted.

The video signal is received by the channel selected by the tuner 1 and sent to the character signal processing section 2. The form of the data unit can be identified by the data unit identification parameter of the data unit of the character multiplex signal decoded by the character signal processing unit 2. Therefore, in the signal system shown in FIG. 9, all the data groups including the program management data unit, and the data group of the page data, the data group header, the page data header, and the character data portion of the data unit are selected. It is stored in the storage unit 15. Then, the data is read out when necessary, the program management data is used for program management, and the character data portion is used for the character dividing unit 5 and the character / graphic processing unit 3.
Output to Subsequent processing is the same as in the case of the second embodiment, and processing such as voice conversion is performed, so description will be omitted.

As described above, by storing the character data portion in advance and reading it out when necessary, the time spent for receiving the signal is eliminated, and the processing with a short waiting time becomes possible.

It should be noted that even other data broadcasting receivers using the character multiplex broadcasting standard need only transmit the character code as data, and the same effect is exhibited.

Needless to say, the above embodiments may be combined.

[0055]

Since the present invention is configured as described above, it has the following effects.

Since the character data portion of the character multiplex signal of the character multiplex broadcasting is divided into clauses and words, when the character data portion of the character multiplex broadcasting is converted into voice or there is an error in the character data portion, the clause or word Errors can be corrected using related information.

Since the character data portion of the character multiplex signal of the character multiplex broadcasting is converted into voice and output,
You can understand the contents of the character multiplex broadcast without looking at the screen.

Further, since the character data portion of the character multiplex signal of the character multiplex broadcasting is converted into the voice and the screen display of the character multiplex signal is output at the same time, the image is displayed between the video signal and the character multiplex signal. As for the sound, any selection can be made between the sound accompanying the video signal and the sound converted from the character multiplex broadcasting.

In addition, when there is an error in the character data portion of the character multiplex signal of the character multiplex broadcasting, the correct character or phrase is corrected from the related information such as the preceding and following clauses, so the erroneous character data is discarded. It can be corrected and displayed without doing, and the waiting time can be shortened.

Furthermore, since the character data portion of the character multiplex signal of the character multiplex broadcasting is selected and stored, by calling the stored data, the waiting time for receiving the signal is eliminated.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a teletext broadcast receiver that is Embodiment 1 of the present invention.

[Fig. 2] Fig. 2 is a block diagram showing a configuration of a teletext broadcast receiver that is Embodiment 2 of the present invention.

FIG. 3 is an explanatory diagram showing a function of voice conversion in the second, third and fifth embodiments of the present invention.

FIG. 4 is a block diagram showing a configuration of a teletext broadcast receiver that is Embodiment 3 of the present invention.

[Fig. 5] Fig. 5 is a block diagram showing the configuration of a teletext broadcast receiver that is Embodiment 4 of the present invention.

FIG. 6 is an explanatory diagram showing a function of error correction according to the fourth embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a teletext receiver according to a fifth embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a conventional teletext receiver.

FIG. 9 is an explanatory diagram showing a conventional character multiplex broadcasting signal system.

[Explanation of symbols]

1 tuner, 2 character signal processing unit, 3 character graphic processing unit, 4 antenna, 5 character dividing unit, 6 dictionary unit, 7 audio converting unit, 8 speaker, 9 display, 10 video signal processing unit, 11 audio signal processing unit, 12 changeover switch, 13 changeover switch, 14 error correction section, 15 storage section.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location H04N 5/445

Claims (5)

[Claims] 1. A character signal processing unit for detecting and decoding a character multiplex broadcast signal from a video signal, and a character data portion of the character multiplex signal decoded by the character signal processing unit is divided into morphological elements of clauses or words. A character multiplex broadcasting receiver comprising a character dividing unit. 2. A character signal processing unit for detecting and decoding a character multiplex broadcasting signal from a video signal, and a character data portion of the character multiplex signal decoded by the character signal processing unit is divided into morphological elements of clauses or words. A character multiplex broadcasting receiver comprising: a character dividing unit, a voice converting unit that converts the divided morphological elements into a voice signal, and a voice output unit that outputs a voice. 3. The character multiplex broadcast reception according to claim 2, further comprising a character / graphics processing unit for converting the character multiplex signal into a character image, and a screen display unit for displaying the character image or video signal on the screen. Machine. 4. A character signal processing unit for detecting and decoding a character multiplex broadcasting signal from a video signal, and a character data portion of the character multiplex signal decoded by the character signal processing unit is divided into morphological elements of clauses or words. A character dividing unit and an error correcting unit for estimating and correcting a character at an incorrect position from the divided morphological elements when there is an error in the character data portion of the character multiplexed signal. Teletext receiver. 5. A character signal processing unit for detecting and decoding a character multiplex broadcast signal from a video signal, and a storage unit for selecting a character data portion from the decoded character signal and storing a data string of the character data. The teletext receiver according to any one of claims 1 to 4, characterized in that