JP2002262193A - Digital television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital television receiver by which a caption of a channel after channel revision can immediately appear on the screen when a channel is revised into the channel with the caption. SOLUTION: While receiving a channel obtained from a TS separate section 4, a caption/character super processing section analyzes caption information in other channel than the selected channel so that the caption information of the analyzed other channel can immediately appear on the screen when the other channel is selected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital television receiver.

[0002]

2. Description of the Related Art CS digital broadcasting which has been broadcast in Japan since 1995, and December 1, 2000
In BS digital broadcasting, which started its main broadcast on the day, video information and audio information compressed as digital information on the broadcasting station side, and information on programs being broadcast in addition to the MPEG2 system standard (ISO / IEC138)
The transport stream (Transport Stream: TS) multiplexed by 18-1) is digitally modulated and transmitted. On the receiver side, video / audio and other information are separated and reproduced from a TS obtained by digitally demodulating a received signal, and such broadcasting and its receiver are becoming widespread.

[0003] Among them, in BS digital broadcasting, subtitles for displaying translations of dialogues such as movies mainly on video, and text superimposed (hereinafter referred to as subtitles and text) for displaying on video in emergency broadcasting. Data related to supermarkets may be collectively referred to as “subtitles”, and PES (Packetized Ele) that is different from video and audio.
mentary stream) and T
S is multiplexed and transmitted, and the receiver separates and analyzes it from the TS, so that it can be displayed as subtitles on the receiver screen as appropriate.

[0004]

[Problems to be solved by the invention]
The minimum transmission frequency at which the caption management data necessary for displaying the superimposed text is transmitted from the broadcast station side is based on the standard (BS Digital Broadcasting Data Broadcasting Operational Regulations Vol. 3, 7.2.1 organization,
Due to transmission restrictions (12), up to 5.0 seconds is allowed, so that the PES of the caption is obtained after changing the channel as in the conventional case, and it is analyzed to obtain the first caption management data. It takes about 5 seconds at maximum to receive and send subtitles / superimposed text. This means that, for example, even if a viewer switches to a foreign language movie channel and displays an image, a time lag of up to about 5 seconds occurs until Japanese subtitles that should be displayed at the same time are displayed. It means that there is a problem that it takes time to be able to grasp the contents of the movie.

[0005] An object of the present invention is to solve such a problem. When there is subtitle information in a channel other than the channel currently being viewed, the subtitle information is analyzed in advance, so that viewing and listening is performed. A digital television receiver that outputs subtitles simultaneously with video output when the viewer switches to a channel with the subtitle information, thereby enabling the viewer to immediately grasp the program contents. It is.

[0006]

According to a first aspect of the present invention, in a digital television receiver for receiving a plurality of programs transmitted by a transport stream, one of the plurality of programs is selected and displayed on a screen. A digital television receiver characterized by analyzing the subtitle information of a program with subtitle information other than the currently selected program while the program is being selected.

According to a second aspect of the present invention, there is provided a digital television receiver for receiving a plurality of programs transmitted by a transport stream.
While selecting a program to which no caption information is added and displaying it on the screen, the subtitle information of a program with caption information other than the selected program is analyzed. Digital television receiver.

According to a third aspect of the present invention, there is provided a digital television receiver for receiving a plurality of programs transmitted by a transport stream, the program being one of the plurality of programs to which subtitle information is added. Is a digital television receiver characterized in that the subtitle information of a program with subtitle information other than the currently selected program is analyzed while the channel is selected and displayed on the screen.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a BS (Broadcasting).
FIG. 2 is a block diagram illustrating a broadcast receiver according to the present embodiment, which can be viewed by a via satellite (digital) user.

The parabolic antenna 1 is arranged outdoors in a predetermined direction where a broadcast satellite is located, and receives a BS digital broadcast signal transmitted from the satellite. The parabolic antenna 1 generally includes a frequency converter, and supplies a signal subjected to reception / frequency conversion to the tuner unit 2.

The tuner 2 extracts a signal of a specific frequency from a high-frequency digital modulation signal containing video and audio data. That is, a process of selecting one from a plurality of digital broadcast transponders is performed. The output of the tuner unit 2 is output to a demodulation unit 3, which performs deinterleaving, error correction, demodulation of a digital modulation signal, and outputs a transport stream TS.

The TS separation unit 4 (demultiplexer (DEM
UX)) is the transport data received from the demodulation unit 3.
MPEG2 (Moving Pict) from the stream
ure Experts Group 2) into video transport packets and audio transport packets, as well as program guide information (EPG information),
It is separated into additional information including caption / text super information, data broadcast information, etc. The TS separation unit 4 supplies the video transport packet to the video decoding unit 5 and supplies the audio transport packet to the audio decoding unit 6.

The video decoding unit 5 decodes the input variable-length code to obtain a quantization coefficient and a motion vector,
It performs T-conversion and motion compensation control based on a motion vector. The video data generated by decoding is OSD
(On-screen display) It is given to the video processing circuit 12 through the multiplex processing unit 8. Video processing circuit 12
Receives video data from the video decoding unit 5,
A / A conversion is performed to convert the signal into a composite signal of, for example, an NTSC format, and an image is displayed on the CRT 13.

The audio decoding unit 6 decodes the input coded signal to generate audio data, and supplies it to the audio processing circuit 14. The audio processing circuit 14 includes the audio decoding unit 6
And performs D / A conversion to generate a right (R) sound analog signal and a left (L) sound analog sound signal.
5 is output.

When a plurality of programs are multiplexed on the same TS, the TS separation unit 4 extracts video, audio, and additional information related to a specific program to be viewed in accordance with an instruction from the operation unit 7. Perform the following processing.

The operation section 7 is for the viewer to input a channel, display and operate information on EPG and data broadcasting, and is provided on the front panel of the remote control and the television receiver. Operation panel included.

The OSD multiplex processing section 8 includes a video decoding section 5
On-screen images such as EPG information, data broadcast information, and subtitles / superimposed text are superimposed on the video information obtained from.

The EPG information processing section 9 analyzes the EPG information separated by the TS separation section 4, displays the EPG information on the screen by the OSD multiplex display section 8, and allows the viewer to operate the operation section 7.
The user selects a program by inputting from.

The data broadcast processing section 9 analyzes the data broadcast information separated by the TS separation section 4 and analyzes the data broadcast information.
Various data are displayed on the screen, and the display contents can be changed by an input from the operation unit 7 by the viewer.

The subtitle / superimposed character processing section 11 analyzes the subtitle / superimposed character information (caption) output by the TS separation section 4 and displays the subtitle / superimposed character on the screen by the OSD multiplex processing section 8.

Next, a block diagram of the receiver shown in FIG. 1 and FIG.
The operation will be described with reference to the flowchart of FIG.

After turning on the power, the tuner 2 and the demodulator 3
Selects a program of a channel set as a specified value, and outputs a TS to the TS separation unit 4. In the case of a stream in which a plurality of channels are multiplexed on the input TS, the TS separation unit 4 extracts a stream corresponding to the channel set as a specified value from the input TS, and outputs video and audio from the extracted stream. , EPG information, subtitle / superimposed text information, and streams related to data broadcasting, and separates them into a video decoding unit 5, an audio decoding unit 6,
Output to the PG information processing unit 9, the data broadcasting processing unit 10, and the subtitle / character super processing unit 11. EPG information processing unit 9
Performs processing such as acquiring EPG information and presenting a program selected by a viewer's operation from the operation unit 7. The data broadcast processing unit 10 obtains and analyzes data broadcast information included in the received program if it is included in the received program.
A data broadcast screen is displayed through the D multiplex processing unit 8, and further, interactive operation of contents included in the data broadcast being broadcast at that time, such as program information display and weather forecast display, is performed by viewer operation. Has become.

If the program being broadcast contains subtitle information (including information on superimposed text), the subtitle / superimpose processing section 11 obtains and analyzes it, and the OSD multiplex processing section 8
To display on the screen.

FIG. 2 shows a case where the receiver shown in FIG. 1 starts receiving a certain program after the power is turned on, and thereafter, the viewer switches the receiving channel (CH) in order to view another program. 2 shows a processing procedure for speeding up the output of subtitles / superimposed text.

First, in the subtitle / character super processing section 11, the receiver performs the processing in step (S) 1, that is, whether the currently received channel (CH) contains subtitle (including superimposed) information. Is determined, and if it is included, the process proceeds to step 10. In step 10, the subtitle information is analyzed and the subtitle is displayed on the screen.

On the other hand, if it is determined in step 1 that the currently received channel does not include caption information, the process proceeds to step 2 as it is.

In step 2, it is determined whether or not there is a caption in a channel other than the channel currently being received on the same TS, and if so, the process proceeds to step 3 where the channel is a channel other than the channel being received on the same TS and has a caption. The subtitles are analyzed for all the channels. If there is no caption in a channel other than the channel being received on the same TS in step 2, step 3 is skipped and the process proceeds to step 4. In step 4, it is determined whether or not there is a change in the channel.

In step 5, it is determined whether or not the channel change in step 4 is a change on the same TS.
A process of changing the channel on (another transponder) is performed, and thereafter, the process returns to step 1.

If the channel is changed on the same TS in step 5, the channel is changed to a channel on the same TS in step 6.

Next, at step 7, it is determined whether or not there is a subtitle at the channel change destination. If there is a subtitle, the subtitle is immediately output and displayed at step 9 using the analysis result at step 3 at step 9.

Then, in step 7, the change destination CH
If there is no subtitle, return to step 3.

Although the above embodiment describes the processing of subtitles on the same TS, the provision of a plurality of tuners allows the processing of subtitles on another TS while receiving a channel on one TS. Can also be configured to do so.

[0034]

As described above, according to the present invention, when subtitle information is present in a channel other than the channel currently being viewed, the subtitle information is analyzed in advance, so that When switching to a channel with subtitle information, by outputting subtitles simultaneously with video output, the viewer can immediately grasp the program contents, which is extremely useful.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a broadcast receiver according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Parabolic antenna 2 Tuner part 3 Demodulation part 4 TS separation part 5 Video decoding part 6 Audio decoding part 7 Operation part 8 OSD multiplex processing part 9 EPG information processing part 10 Data broadcasting processing part 1 Subtitle / character super-processing part 2 Video output part 3 CRT 4 Audio output unit 5 Speaker

Claims (3)

[Claims] 1. A digital television receiver for receiving a plurality of programs transmitted by a transport stream, wherein one of the plurality of programs is selected and displayed on a screen.
A digital television receiver characterized in that the subtitle information of a program with subtitle information other than the currently selected program is analyzed. 2. A digital television receiver for receiving a plurality of programs transmitted by a transport stream, wherein one of the plurality of programs to which no subtitle information is added is selected and displayed on a screen. A digital television receiver characterized in that the subtitle information of a program with subtitle information other than the currently selected program is analyzed. 3. A digital television receiver for receiving a plurality of programs transmitted by a transport stream, wherein one of the plurality of programs to which subtitle information is added is selected and displayed on a screen. A digital television receiver characterized in that the subtitle information of a program with subtitle information other than the currently selected program is analyzed.