JP2003153160A - Device and method for displaying broadcasting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the convenience of a chasing-playback mode. SOLUTION: If a temporary stop is instructed, a selection switch 12 gives an MPEG stream to a memory 14 to be stored. If a display restart is instructed, a controlling part 13 reads the MPEG stream from the memory 14 faster than writing the MPEG stream. The MPEG stream read from the memory 14 is supplied to an MPEG decoder 16 through a selection switch 15. The MPEG decoder 16 is controlled by the controller 13 to perform decoding processing at a fast speed. A display memory 17 accelerates display with thinning processing. An image signal from the display memory 17 is supplied to a TV monitor 18 to be subjected to chasing-playback at a fast speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast display device and a broadcast display method which provide a so-called follow-up display (playback) function.

[0002]

2. Description of the Related Art Conventionally, some television receivers and the like have a chasing display function that enables viewing of a program currently being broadcast with a delay of a predetermined time from the broadcast. This chasing display function is a VT
This is realized by using a recording medium such as an R, an HDD, or a semiconductor memory, and reading and displaying the image signal recorded a predetermined time before recording the image signal received by the television receiver on the recording medium.

By using this follow-up display function, even if the viewing of the program is temporarily stopped during the broadcast, by reading the image stored in the recording medium from the stop position and displaying it, all the programs can be viewed retroactively. Is.

Incidentally, after waiting for the end of the broadcast of the program, the entire program can be viewed by recording and playing the program using a normal VTR or the like. However, when the chasing playback function is used, all the programs can be viewed while delaying the broadcast for a predetermined time without waiting until the broadcast of the program is completed, which is extremely convenient.

[0005]

[Problems to be Solved by the Invention] However, in the past,
In a broadcast recording device for adding a chasing display function to a television receiver or the like, the viewing end time of the program is delayed by the time the viewing is stopped, and it is impossible to sufficiently satisfy the convenience of the user. There was a problem.

In order to realize the follow-up display function, it is necessary to write the broadcast signal at all times during the reception of the television broadcast or continuously after a predetermined timing. Therefore, there is a problem that there is a limitation in using a flash memory or the like, which has a relatively small number of rewritings, as a recording medium.

The present invention has been made in view of the above problems, and makes it possible to view the recorded broadcast signal within a desired time by changing the readout and display rate of the recorded broadcast signal. An object of the present invention is to provide a broadcast display device and a broadcast display method capable of extending the life of the medium by reducing the number of times of rewriting on the medium.

[0008]

A broadcast display device according to the present invention stores a recording medium for recording a digital broadcast signal being received, a digital broadcast signal being received or a digital broadcast signal read from the recording medium. Decoding means for decoding and a recording start timing of the digital broadcast signal being received on the recording medium, and reading the digital broadcast signal recorded on the recording medium at a predetermined read rate in the chase display mode to read the digital broadcast signal. And a display speed control means for giving a decoding speed to the decoding means and setting the decoding speed of the decoding means to a predetermined speed, and a display speed control means for displaying the restored image from the decoding means at a predetermined display speed. Is characterized by.

With this arrangement, the control means instructs the recording medium to start recording the digital broadcast signal being received. As a result, the recording medium starts recording the digital broadcast signal. For example, when the chase display mode is instructed by the user or the like, the control means starts the reading of the digital broadcast signal recorded on the recording medium at a predetermined reading rate. Reading is performed simultaneously with recording. The decoding means decodes the digital broadcast signal from the recording medium at a predetermined coding speed. The restored image from the decoding means is given to the display speed control means and displayed at a predetermined display speed. The reading rate from the recording medium, the decoding acceleration of the decoding means and the display speed can be set,
The display speed in the chasing display mode can be controlled.

Further, the control means records the digital broadcast signal being received in the recording medium in response to an operation for instructing a pause, and sets the chase display mode in response to an operation for instructing to restart the display. It is characterized by setting.

According to this structure, the recording of the digital broadcast signal on the recording medium is started by the temporary stop of the display. Therefore, the digital broadcast signal after the temporary stop of the display can be read from the recording medium. Can be displayed. Since the chase display mode is set in response to the instruction operation to restart the display, it is possible to view the broadcast program after the temporary stop from the desired timing.

Further, in the chasing display mode, the control means receives a signal instructing a display speed,
It is characterized by setting the display speed.

According to this structure, the display speed in the chasing display mode is set in accordance with the display speed instruction.

Further, in the chase display mode, the control means receives a signal instructing a time used in the chase display mode to set the display speed.

With such a configuration, the display speed in the follow-up display mode is set according to the instruction of the time used in the follow-up display mode.

The control means calculates the time used in the chase display mode in the chase display mode by using the program information included in the digital broadcast signal,
The end point of the chase display mode is matched with the end point of the broadcast program.

With such a configuration, the time from the start of the chase display to the end of the broadcast is obtained using the program information contained in the digital broadcast signal, and the display speed in the chase display mode is set accordingly. Since the chasing display ends at the same time as the end of the broadcast program, the convenience is high.

Further, in the chase display mode, the control means performs high-speed display with respect to the speed of normal display based on the incoming speed of the digital broadcast signal being received.

According to this structure, since the time required for the chasing display is shorter than that for displaying at the normal speed, the time required for viewing the program can be shortened.

Further, the display speed control means is characterized in that the commercial portion of the restored image from the decoding means is removed and displayed.

According to this structure, since the commercial portion is not chased and displayed, the time required for viewing the program can be shortened.

Further, the control means is characterized by performing at least one of a still image display and a slow display in the chase display mode.

With such a configuration, a still image display or a slow display can be performed in the chase display mode, and a desired scene or the like can be repeatedly viewed, which is excellent in convenience.

The digital broadcast signal is MPE.
It is characterized by being a G stream.

With such a configuration, it is possible to perform follow-up display with a variable display speed in digital broadcasting adopting an MPEG stream.

In the broadcast display method according to the present invention, a procedure for instructing a recording medium to start recording of a digital broadcast signal being received, a procedure for starting recording of the digital broadcast signal in the recording medium according to the instruction, A procedure for starting the reading of the digital broadcast signal recorded on the recording medium at a predetermined read rate in accordance with the chase display mode instruction, and a procedure for decoding the digital broadcast signal read from the recording medium at a predetermined decoding speed. And a procedure for displaying the restored image obtained by decoding at a predetermined display speed.

With such a configuration, the recording start timing of the digital broadcast signal being received is instructed to the recording medium, and the recording of the digital broadcast signal on the recording medium is started. When the chase display mode instruction is issued, the digital broadcast signal recorded on the recording medium at a predetermined read rate is read and decoded. By properly setting the read rate and the decoding acceleration, the time axis of the restored image is controlled and displayed at a predetermined display speed.

Further, by making the reading rate of the recording medium faster than the writing rate, the reading of the recording medium is caught up with the writing and the recording of the digital broadcast signal on the recording medium is ended. To do.

According to such a configuration, since reading is performed at a speed higher than the writing rate, reading from the recording medium catches up with writing and chasing display is shortened.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the first of the present invention.
3 is a block diagram showing a broadcast display device according to the embodiment of FIG. FIG. 2 is a block diagram showing a television receiving system in which the broadcast display device of FIG. 1 is incorporated.

In this embodiment, the time required for chasing display is shortened by recording the broadcast signal and increasing the read speed and the display speed, and the time required for viewing the program after the end of the program is reduced. Can be shortened.

In FIG. 2, a digital broadcast signal is input to the broadcast receiver 1 such as a set top box. In recent years, the digitization of images has been advanced by the establishment of image compression techniques such as MPEG (Moving Picture Experts Group) 2. Also in television broadcasting, digital broadcasting adopting the MPEG2 system has started. To the broadcast receiver 1, for example, such an MPEG2 digital broadcast signal is input. The broadcast receiver 1 demodulates the received digital broadcast signal to obtain the MPEG2 standard MPEG.
Get the stream.

According to the MPEG2 standard, DCT (Discrete C
cine) transform, interframe predictive coding, run length coding, and entropy coding are used in combination to code a video signal. That is, in the MPEG system, not only compression by DCT (intra-frame compression) is performed within one frame, but also inter-frame compression for reducing redundancy in the time axis direction by utilizing correlation between frames is adopted. The broadcast display device 2 decodes such an MPEG stream and outputs a video signal to the TV monitor 18. The TV monitor 18 displays a program based on the input video signal.

In FIG. 1, the MPEG stream from the broadcast receiver 1 is given to the input terminal 11 of the broadcast display device 2. This MPEG stream is given to the selection switch 12. The selection switch 12 is controlled by the control unit 13 and outputs the input MPEG stream to one or both of the memory 14 and the selection switch 15. The memory 14 is controlled by the control unit 13 and receives the input MPEG.
Write and read stream, select switch 1
Output to 5. The selection switch 15 is controlled by the control unit 13 to selectively output one of the outputs of the selection switch 12 and the memory 14 to the MPEG decoder 16.

The memory 14 is an image memory composed of elements such as DRAM, SRAM and flash memory. For example, if the memory 14 has a capacity of 265 Mbytes, the transmission rate of the MPEG stream is 6 Mbps.
5 minutes (6 × 5 × 60 = 1800
It is possible to record an MPEG stream for a time of M bits = 225 Mbytes) or more.

As the memory 14, a one-port memory capable of high-speed writing and reading is used, and writing and reading are time-divided, and arbitration is performed so that writing and reading are substantially performed in parallel. . Of course, a memory having two (or more) ports can be applied so that writing and reading can be performed independently.

The MPEG decoder 16 is controlled by the controller 13 to decode the input MPEG stream and output an analog video signal to the display memory 17. The display memory 17 configures a screen by the input video signal, and is controlled by the control unit 13 to interpolate or thin the screen and output it to the TV monitor 18. The TV monitor 18 displays the input video signal on the screen.

The control section 13 receives an operation signal based on a user operation of an input device (not shown), and switches the selection switches 12 and 15, the writing and reading of the memory 14, the decoding processing of the MPEG decoder 16 according to the operation signal. Writing and reading of the display memory 17 are controlled.

When the user pauses the viewing for the chasing display function, the control unit 13 controls the selection switch 12 to supply the MPEG stream not only to the selection switch 15 but also to the memory 14. Further, when the viewing restart operation for the chase display function is performed, the control unit 13 controls the selection switch 12 to supply the MPEG stream only to the memory 14, and the M memory 14 is supplied to the memory 14.
Simultaneously with the writing of the PEG stream, the reading of the MPEG stream written after the pause operation is executed. Further, in this case, the control unit 13 causes the selection switch 15 to select the output of the memory 14 and supplies it to the MPEG decoder 16.

In the present embodiment, during chasing display, the control unit 13 makes the reading speed of the memory 14 higher than the writing speed, and accordingly, the MPEG speed is increased.
The decoding processing speed of the decoder 16 is increased.
Further, the control unit 13 controls the display memory 17 to thin out the configured screens at a predetermined thinning rate, and the TV monitor 18
It is designed to be supplied. The selection switch 12
Is not essential, and for example, the writing of the MPEG stream to the memory 14 may be controlled by a control signal from the control unit 13 to the memory 14.

Although only the video system using the display memory 17 is shown in FIG. 1, the audio signal from the MPEG decoder 16 is also subjected to the thinning process on the time axis in the same manner as the video system, and the TV monitor. It is obvious that the chase reproduction can be performed in synchronism with the video system by supplying the video signal to the video system 18.

Next, the operation of the embodiment thus configured will be described with reference to the flowchart of FIG. 3 and the timing chart of FIG. FIG. 3 shows the control of the memory 14 by the control unit 13. Further, FIG. 4 shows the operation timing of the chase display mode in the present embodiment with the horizontal axis representing time, and FIG. 4A shows the screen display based on the MPEG stream being received.
4B shows a screen display based on the MPEG stream read from the memory 14, and FIG. 4C shows writing and reading timing of the memory 14.

MPEG input through the input terminal 11
The stream is supplied to the selection switch 12. Normally, the input MPEG stream is supplied to the MPEG decoder 16 via the selection switches 12 and 15 under the control of the selection switches 12 and 15 by the control unit 13. As a result, the MPEG stream from the input terminal 1 is given to the MPEG decoder 16 and decoded.

The video signal obtained by the decoding process of the MPEG decoder 16 is supplied to the TV monitor 18 via the display memory 17, and the program based on the MPEG stream is displayed on the display screen of the TV monitor 18.

Here, it is assumed that a pause operation for the chasing display mode is performed. When the control unit 13 detects the pause operation by the user in step S1 of FIG. 3, the MPEG stream is stored in the memory 1 as shown in FIG.
4 to record (step S2). That is, in this case, the control unit 13 gives the MPEG stream input by the selection switch 12 to the memory 14 to perform writing. Thus, the MPEG stream after the pause operation is recorded in the memory 14 as shown in FIG.

In this case, as shown by the broken line in FIG. 4A, the input MPEG stream is given to the MPEG decoder 16 through the selection switch 15 and the TV
The program may be displayed on the screen of the monitor 18. Further, the images immediately before the pause operation stored in the display memory 17 may be continuously supplied to the TV monitor 18 to display a still image. Next, the control unit 13
Becomes a standby state for the display restart operation in step S3. Here, it is assumed that the user performs the display resuming operation after the suspension period shown by the broken line in FIG. Control unit 13
When detecting the display restart operation by the user, the CPU instructs the reading of the MPEG stream written in the memory 14, causes the selection switch 15 to select the output of the memory 14, and supplies it to the MPEG decoder 16 (step S4).
).

In order to display the chasing display at high speed, the control unit 13 instructs the memory 14 to read out at a predetermined double speed with respect to the write rate. For example, the control unit 13
Sets the read rate to 1.5 times the write rate. As shown by the thick line in FIG. 4C, the MPEG stream is read from the memory 14 at high speed, and the selection switch 1
5 to the MPEG decoder 16. Also,
The control unit 13 speeds up the decoding process of the MPEG decoder 16 by 1.5 times by changing the operation clock of the MPEG decoder 16. As a result, the image of each field (or frame) is restored from the MPEG decoder 16 at a speed 1.5 times faster. The restored image is supplied to the display memory 17.

The display memory 17, under the control of the control unit 13, thins out one of the three restored images from the MPEG decoder 16 and supplies it to the TV monitor 18. As a result, an image whose time axis is shortened by 1.5 times is displayed on the screen of the TV monitor 18. The thick line in FIG. 4B indicates high-speed display based on the output of the memory 14.

When a predetermined time has elapsed from the start of the chasing display, all the MPEG streams recorded in the memory 14 are read due to the difference between the writing rate and the reading rate of the memory 14. When the controller 13 detects the end of reading in step S5, it stops writing to the memory 14 (step S6) and controls the selection switches 12 and 15 to supply the input MPEG stream to the MPEG decoder 16. As a result, FIG.
As shown in (a), an image based on the program being broadcast is displayed on the screen of the TV monitor 18 at a normal speed.

As described above, in the present embodiment, the MPEG stream is written in the memory when the user instructs the temporary stop of the display due to the urgent need of the user, and the writing is performed when the restart of the display is instructed. The stored MPEG stream is read out at a speed higher than the writing rate. Furthermore, the read M
The PEG stream is decoded at high speed, and restored images are thinned out and displayed. As a result, the chasing display is performed at a high speed, and the program display based on the output of the memory is made to catch up with the display of the program being broadcast, thereby ending the chasing display and returning to the normal display. Therefore, even in the case of performing the chasing display, it is possible to watch the program being broadcast within the broadcast time, and even when the chasing display function is used,
Writing to the memory is temporary, and the number of times of rewriting to the memory can be reduced to extend the life of the medium.

In the present embodiment, the control unit 13 sets an appropriate display speed during the chasing display.
It is also possible to specify the display speed desired by the user and set the read rate of the memory 14, the decoding speed of the MPEG decoder 16, the thinning rate of the display memory 17, etc. based on the specified display speed. In this case, the user can perform follow-up display at a desired display speed.

In addition, the present embodiment has a structure using a small capacity semiconductor memory, and the cost can be reduced as compared with the case where a disk device or a tape device is used as a recording medium. Also, the broadcast display device of FIG. 1 can be built in a television receiver.

FIG. 5 is a flow chart showing a broadcast display method according to the second embodiment of the present invention. In FIG. 5, the same steps as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted. FIG. 5 shows the control of the controller 13 in the reverse display mode.

In the first embodiment, the display speed in the chasing display is appropriately set by the control unit or the user. On the other hand, the present embodiment enables viewing within a desired time by specifying the time required for chasing display. The hardware configuration in the present embodiment is the same as that in FIG. 1, and only the control of the control unit 13 is different.

Now, it is assumed that a pause operation for chasing display is performed. When the control unit 13 (see FIG. 1) detects a pause operation in step S1 of FIG. 5,
Using the clock function in the control unit 13, the operation time of the pause is acquired (step S11). Next, the control unit 13
In step S2, the MPEG stream is stored in the memory 1
Store in 4.

Here, it is assumed that the user performs a display restart operation. When detecting the display restart operation, the control unit 13 acquires the operation time of the display restart operation in step S12.
Next, the control unit 13 reads the MPEG stream written in the memory 14 and supplies it to the MPEG decoder 16 via the selection switch 15 in step S13.
In this case, the memory 14 reads at the same rate as the writing rate. Also, the MPEG decoder 16 decodes at a normal speed, and the display memory 17 does not perform thinning. As a result, on the display screen of the TV monitor 18,
The image after the pause operation is displayed at the normal speed.

In the present embodiment, the user can specify the remaining time for chasing display. When the remaining time of the chase display is designated by the user's input operation, the control unit 13 shifts the processing from step S14 to step S15, and acquires the pause time from the pause operation to the display restart operation. Next, the display speed of the display based on the MPEG stream recorded in the memory 14 is calculated based on the difference between the remaining time of the chase display designated by the user and the pause time. Control unit 1
3 is the memory 14 so that the calculated display speed can be obtained.
The high-speed reading from is started (step S4).

For example, when the pause time is 15 minutes and the user specifies 10 minutes as the remaining time for the chasing display, the control unit 13 writes the 1.
Read out at 5 times speed. In this case, M
The decoding speed of the PEG decoder 16 is also set to 1.5 times, and the display rate read from the display memory 17 is also set to 1.5 times.

As a result, 10 minutes after the input operation of the remaining time of the chase display by the user, the reading from the memory 14 catches up with the writing, and the control unit 13 causes the selection switches 12 and 15 to send the MPEG stream to the MPEG decoder 16. After being supplied, the program being broadcast is displayed at normal speed thereafter.

As described above, in the present embodiment, the user can specify the high-speed display by the time for performing the follow-up display instead of the speed for the follow-up display.

FIG. 6 is a block diagram showing a third embodiment of the present invention. 6, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, the program information included in the digital broadcast signal is extracted so that the end point of the chasing display can be automatically matched with the end point of the broadcast program.

The present embodiment differs from the first embodiment in that a program information acquisition unit 21 is added.

In the satellite (BS) digital broadcasting using the broadcasting satellite, as described above, the compression technique based on MPEG2 is adopted, which makes it possible to increase the number of channels. Due to the increase in the number of channels, the number of programs to be broadcast at one time becomes extremely large, which makes it difficult to select a program to watch. Therefore, in BS digital broadcasting, an EPG (Electronic Program Guide) function of displaying a program guide on the screen and electronically selecting a program is added. In order to realize this EPG function, B
In S digital broadcasting, SIT (Selection Information) along with a video stream and an audio stream.
Table) is multiplexed, and data called EIT (Event Information Table) is inserted into this SIT stream. The EIT data is program guide data of each broadcast and introduction data of the program itself, and indicates correspondence between the programs included in each service and information about each program.

In a set top box compatible with BS digital broadcasting, generally, a program guide is created based on received EIT data and the like, and program guide data (E
A program guide display creating device for displaying (PG) is provided. That is, the viewer can select a program by using the program information multiplexed in the digital broadcast signal. The program information acquisition unit 21 receives the EI from the broadcast signal.
Program information such as T data is acquired and output to the control unit 13. As a result, the control unit 13 can grasp the start time and end time of the broadcast program.

Next, the operation of the embodiment thus configured will be described with reference to the flowchart of FIG. In FIG. 7, the same steps as those in FIG. FIG. 7 shows the control of the control unit 13 in the reverse display mode.

Now, it is assumed that a pause operation for chasing display is performed. When the control unit 13 (see FIG. 1) detects a pause operation in step S1 of FIG. 7,
Using the clock function in the control unit 13, the operation time of the pause is acquired (step S11). Next, the control unit 13
In step S2, MPEG stream memory 1
Writing to 4 is started.

Here, it is assumed that the user performs a display restart operation. When detecting the display restart operation, the control unit 13 acquires the operation time of the display restart operation in step S12.
On the other hand, the program information acquisition unit 21 acquires program information such as EIT data from the SIT stream in the broadcast signal at a predetermined timing and supplies the program information to the control unit 13. Control unit 13
Acquires the end time of the program being received in step S21 based on this EIT data.

Next, in step S22, the control unit 13 obtains the time (remaining program time) from the time when the display resuming operation is performed to the program end time, and determines the remaining program time, the pause period, and the program. The chase display speed is determined according to the ratio of the remaining time to the sum time (step S1
6). The control unit 13 determines the read rate from the memory 14 based on the calculated follow-up display speed.

The subsequent operation is similar to that of the second embodiment. As a result, the chasing display coincides with the end time of the program currently being broadcast, and the viewer can view all of the program within the range of the actual broadcast time of the program regardless of the pause of the viewing. .

As described above, in the present embodiment, the end time of the follow-up display can be matched with the end time of the actual program without the user considering the speed or time of the follow-up display.

FIG. 8 is a block diagram showing a fourth embodiment of the present invention. In FIG. 8, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

In the present embodiment, the display of commercials is omitted during the chasing display.

This embodiment differs from the first embodiment in that a CM removing unit 22 is added. CM removal unit 22 is MP
The commercial (CM) portion of the restored image output from the EG decoder 16 is detected, and the CM portion is not output to the display memory 17. In addition, CM
A known detection method, for example, a method that utilizes a characteristic such that a scene change occurs in the commercial portion and is broadcast in stereo in a multiple of 15 seconds is used for the detection of the commercial in the removal unit 22.

In the embodiment configured as described above, the control unit 13 sets the memory 14 and the MPEG decoder 16 at a speed higher than the normal display speed of the chasing display in consideration of the commercial time. Read and decode processing is performed.

During chasing display, a restored image is output from the MPEG decoder 16 based on the output of the memory 14. The CM removing unit 22 removes the commercial portion of the restored image and outputs it to the display memory 17. Even in this case, the reading rate of the memory 14 and the MPEG decoder 1
Since the decoding process of 6 is sufficiently fast, the display memory 17 does not underflow. Display memory 17
Is the TV that thins out the input restored image at a predetermined thinning rate.
Output to the monitor 18.

As a result, the commercial-removed program is displayed at high speed on the screen of the TV monitor 18. Therefore, the time required for chasing display can be shortened as compared with the case of displaying all programs including commercials. Also, if you want to keep the time required for chasing display constant, you can slow down the display speed of chasing display.
It is possible to make the display easier to see.

As described above, in the present embodiment, since the commercial portion can be removed during the follow-up display, the time required for the follow-up display can be shortened or the display speed of the follow-up display can be slowed down.

In this embodiment, MPEG is used.
Although the commercial part is automatically detected from the output of the decoder 16, the commercial part may be deleted when the stream of the program is extracted from the broadcast signal. It is also clear that the display of the commercial part may be omitted by the user performing an operation of skipping the commercial part.

FIG. 9 is a flow chart showing a broadcast display method according to the fifth embodiment of the present invention. In FIG. 9, the same steps as those in FIG. 5 are designated by the same reference numerals and the description thereof will be omitted.

In the first embodiment, the example applied to the chasing display has been described. On the other hand, the present embodiment is also applied to the case of displaying a still image or a slow display. The hardware configuration in the present embodiment is the same as that in FIG. 1, and only the control of the control unit 13 is different.

Now, for example, it is assumed that a scene to be watched appears again while the program being broadcast is being displayed in the normal display. When displaying a still image or a slow display of this scene, the user performs an operation such as a predetermined button input (chase display operation) for performing a chase display immediately after recognizing the scene. If there is a possibility that a scene desired to be displayed as a still image or a slow display will appear in the program, the user performs a chase display operation at a predetermined timing before the appearance of the scene, for example, at the start of the program. When the chase display operation is detected in step S29 of FIG. 9, the control unit 13 (see FIG. 1) records the MPEG stream in the memory 14 in step S2. After that, the MPEG stream is sequentially recorded in the memory 14.

Next, in step S13, the control unit 13 reads the MPEG stream written in the memory 14, and the MPEG decoder 16 via the selection switch 15 is read.
Supply to. In this case, the memory 14 reads at the same rate as the writing rate. Also, the MPEG decoder 16 decodes at a normal speed, and the display memory 17 does not perform thinning. As a result, the image after the chasing display operation is displayed at the normal speed on the display screen of the TV monitor 18.

Next, the user specifies the time (retro time) to the past scene that he / she wants to follow and display. When the retroactive time is acquired in step S30, the control unit 13 monitors the decoding process of the MPEG decoder 16 in the next step S31 to store the MPEG stream necessary for restoring the image preceding the retroactive time. The address of the memory 14 that is currently in use.

The user also designates whether the follow-up display is to be performed by a still image or slow playback. It should be noted that chasing display at normal speed or high speed is also possible.
When the still image display is designated by the user, the control unit 13
Shifts the processing from step S32 to step S33 to read the MPEG stream required for restoring one screen from the memory 14. This MPEG stream is supplied to the MPEG decoder 16 via the selection switch 15.

In this way, the restored image before the backward time designated by the user is output from the MPEG decoder 16 and accumulated in the display memory 17. The display memory 17 is the control unit 1.
Controlled by 3, the accumulated restored image is repeatedly output to the TV monitor 18. As a result, a still image of the scene desired by the user is displayed on the screen of the TV monitor 18 (step S34).

On the other hand, it is assumed that the user specifies the slow display. In step S41, the control unit 13 acquires the slow display speed designated by the user, for example. The control unit 13 starts reading from the memory 14 at the designated slow display speed (step S42). The MPEG stream from the memory 14 is supplied to the MPEG decoder 16 via the selection switch 15.

In this case, the control unit 13 causes the MPEG decoder 16 to perform a decoding process at a decoding speed according to the slow display speed. This enables the MPEG decoder 16
Outputs a restored image at low speed. Display memory 17
Interpolates the input restored image to create a video signal that can be displayed on the TV monitor 18, and outputs the video signal to the TV monitor 18. Thus, the slow display at the speed designated by the user is performed on the screen of the TV monitor 18 (step S43).

The user performs a predetermined operation to shift from the still image display or the slow display to another display mode. When the chasing display speed is acquired in step S35, the control unit 13 starts reading at the specified speed in the next step S36. Other operations are the same as in FIG.

As described above, in the present embodiment, not only high-speed display but also normal display and
Still image display or slow display is possible. For example, when it is desired to check the program of the application summary of the prize, by recording a stream for several minutes in the memory, it is possible to display a still image or a slow display of the application outline. In addition, it is clear that the transition from the still image display to the slow display, the transition from the slow display to the still image display, and the transition between these display modes and the normal display or the high speed display are also possible. is there.

[0091]

As described above, according to the present invention, by making it possible to read the recorded broadcast signal and change the display rate, it is possible to view the signal within a desired time and rewrite the recording medium. This has the effect of reducing the number of times and extending the life of the medium.

[Brief description of drawings]

FIG. 1 is a block diagram showing a broadcast display device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a television receiving system in which the broadcast display device of FIG. 1 is incorporated.

FIG. 3 is a flowchart for explaining the operation of the first embodiment.

FIG. 4 is a timing chart for explaining the operation of the first embodiment.

FIG. 5 is a flowchart showing a broadcast display method according to a second embodiment of the present invention.

FIG. 6 is a block diagram showing a third embodiment of the present invention.

FIG. 7 is a flowchart for explaining the operation of the third embodiment.

FIG. 8 is a block diagram showing a fourth embodiment of the present invention.

FIG. 9 is a flowchart showing a broadcast display method according to a fifth embodiment of the present invention.

[Explanation of symbols]

12, 15 ... Selection switch 13 ... Control unit 14 ... Memory 16 ... MPEG decoder 17 ... Display memory 18 ... TV monitor

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 5/76 H04N 5/91 L 5/92 5/92 HF term (reference) 5C025 BA27 DA01 5C052 AA01 AC01 CC11 5C053 FA20 GA11 GB38 HA33 KA03 LA06 5D044 BC01 BC04 CC04 DE19 DE43 DE48 EF03 EF05 FG10 FG18 FG23 GK03 GK08 GK12 HH07 HL11 5D110 AA04 AA08 AA29 BB11 DA18 DB05 DB08 DC05 DC15 DD02 DE01 FA02 FA02 FA02 FA02 FA02 FA02 FA02 FA02 FA02 FA02 EA02

Claims (11)

[Claims] 1. A recording medium for recording a digital broadcast signal being received, a decoding means for decoding the digital broadcast signal being received or a digital broadcast signal read from the recording medium, and the recording medium having the above-mentioned structure. Instructing the recording start timing of the digital broadcast signal being received, reading the digital broadcast signal recorded in the recording medium at a predetermined reading rate in the chase display mode, giving it to the decoding means, and decoding by the decoding means. A broadcast display device comprising: control means for setting a speed to a predetermined speed; and display speed control means for displaying a restored image from the decoding means at a predetermined display speed. 2. The control means records the digital broadcast signal being received in the recording medium in response to an operation of instructing a pause, and sets the chase display mode in response to an operation of instructing a display restart. The broadcast display device according to claim 1, wherein the broadcast display device is set. 3. The broadcast display device according to claim 1, wherein the control means sets a display speed by inputting a signal instructing a display speed in the chasing display mode. 4. The broadcast display device according to claim 1, wherein the control means sets a display speed in the chase display mode by receiving a signal indicating a time used in the chase display mode. . 5. The control means calculates the time used in the chase display mode by using the program information included in the digital broadcast signal in the chase display mode, and determines the end time of the chase display mode as the end time of the broadcast program. The broadcast display device according to claim 4, characterized in that 6. The control means causes the high-speed display to be performed in the follow-up display mode with respect to the normal display speed based on the incoming speed of the digital broadcast signal being received. The broadcast display device described. 7. The broadcast display device according to claim 1, wherein the display speed control means removes and displays a commercial part in the restored image from the decoding means. 8. The broadcast display device according to claim 1, wherein the control unit causes at least one of a still image display and a slow display in the chase display mode. 9. The broadcast display device according to claim 1, wherein the digital broadcast signal is an MPEG stream. 10. A procedure for instructing a recording medium on a recording start timing of a digital broadcast signal being received, a procedure for starting recording of the digital broadcast signal on the recording medium according to the instruction, and a predetermined operation according to an instruction of a chase display mode. The procedure for starting the reading of the digital broadcast signal recorded on the recording medium at the read rate of, the procedure for decoding the digital broadcast signal read from the recording medium at a predetermined decoding speed, and And a procedure for displaying the restored image at a predetermined display speed. 11. A reading rate of the recording medium is set to be higher than a writing rate so that reading of the recording medium catches up with writing and recording of the digital broadcast signal on the recording medium is ended. The broadcast display method according to claim 10.