JP3825920B2 - Recording / playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording / playback apparatus suitable for use in a delay playback apparatus that records another TV program while watching a TV program and plays back the program with an arbitrary delay.
[0002]
[Prior art]
In recent years, the digital TV broadcasting system has attracted attention as a next-generation TV broadcasting system. With the digitalization of broadcasting systems, it has become easier to install various functions in television receivers. Among them, a high-speed and large-capacity storage device such as a hard disk, which has a high speed of random access, can be read and written at the same time, and a delay playback device that uses this storage device as a delay device has been developed. .
[0003]
This delayed playback device is designed to be able to watch a program at an arbitrary time while recording a currently broadcast program. For example, if the currently viewed sport broadcast is extended, the sport broadcast will be viewed as it is, and the drama broadcast simultaneously on other channels will be recorded with a delay playback device, and the recorded drama will be recorded after the end of the sport broadcast. Can be played from the beginning. In other words, the currently broadcast program can be viewed with an arbitrary delay from the start of the broadcast.
[0004]
Further, the program recorded by the delayed playback device can be subjected to special playback such as slow playback and search playback, and can be displayed as if the currently broadcast program was specially played back.
[0005]
FIG. 5 is a block diagram showing a configuration of a conventional delay reproduction apparatus.
In FIG. 5, the digital broadcast signal received from the input terminal 301 is tuned to the first program signal to be viewed and the second program signal to be recorded by the tuner unit 303 under the control of the control unit 317. The first program signal is output to the terminal a of the changeover switch 307, and the second program signal is output to the recording / playback unit 305.
[0006]
Note that H-222 standardized by ITU-T is known as a bit stream format of a digitized program signal output from the tuner unit 303, and MPEG2 is used as an image signal and an audio signal. A signal compressed by a method or the like is used.
[0007]
The recording / reproducing unit 305 starts reproduction with an arbitrary time delay under the control of the control unit 317 while recording the input second program signal, and outputs the reproduced signal to the switch 307.
The switch 307 is connected to the terminal a if the program to be displayed is the second program signal that is delayed and reproduced, and to the terminal b if the program to be displayed is the first program signal currently being broadcast. Connecting.
[0008]
The output of the switch 307 is sent to the decoding unit 309. The decoding unit 309 restores the compressed image signal and audio signal. The restored image signal is sent to an On Screen Display (hereinafter referred to as OSD) unit 311. Under the control of the control unit 317, the OSD unit 311 synthesizes the displayed program number (channel number), the recorded program number, the volume state of the audio, and the like with the restored image signal, and then displays the display device 315. Output to.
[0009]
A thin display device called a CRT, a liquid crystal display, or a PDP is used as the display device 315, and displays the synthesized image signal. Further, it is added to the restored audio speaker 313.
[0010]
[Problems to be solved by the invention]
However, in one broadcast program signal, a main program and subprograms including commercials, weather forecasts, news, preliminary announcements, etc. are time-division multiplexed. In the case of continuous playback, there is a problem that the subprogram cannot be played back and displayed simultaneously with the main program.
[0011]
The present invention has been made in order to solve the above-described problems, and has an object to allow a main program and a sub program to be reproduced and displayed at the same time.
[0012]
[Means for Solving the Problems]
The recording / reproducing apparatus of the present invention is a recording / reproducing apparatus that processes a bit stream output from a tuner unit that receives broadcast waves and records the bit stream in a recording unit, and includes a program included in the bit stream output from the tuner unit Separation means for separating information and header information related to the program information, and control for generating new header information to be added to the program information separated by the separation means from the header information separated by the separation means The main program header information related to the main program information and the main program information, and the sub program header information related to the sub program information and the sub program information are time-division multiplexed. The control means converts the bitstream of the main program information based on the main program header information and the subprogram header information separated by the separation means. Wherein the Tsu preparative stream with divided into the bit stream of the sub-program information, the bit stream of the main program information is characterized by the addition of the main program header information and at least one of said sub-program header information.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, the digital broadcast signal received from the input terminal 101 is tuned to the first program signal to be viewed and the second program signal to be recorded by the tuner unit 103 under the control of the control unit 317. The second program signal is output to the delay unit 121 and also output to the header separation unit 127.
[0017]
FIG. 2A shows the data structure of the bit stream of the second program signal output from the tuner unit 103. As shown, the main program header, the main program, the sub program header, and the sub program are time-shared. Is multiplexed.
[0018]
The header separation unit 127 separates the main program header and the sub program header and sends them to the control unit 119. The delay unit 121 delays the second program signal and sends it to the changeover switch 123 until the header can be separated. In addition, the control unit 119 switches the switch 123 according to the separated main program header and subprogram header, and creates first and second new headers. The first header includes a main program header and a sub program header, and the second header consists of only the sub program header.
The first header is sent to the header adding unit 125, and the second header is sent to the header adding unit 126.
[0019]
The switch 123 is switched according to the separated main program or subprogram header, and only the main program information of the second program signal is selected from the terminal a, and after the first header is added, the recording is performed. Recorded by the playback unit 105. In addition, only the subprogram information of the second program signal is selected from the terminal b, and after the second header is added, it is recorded by the recording / reproducing unit 106.
The header adding units 125 and 126 eliminate time discontinuity caused by extraction of main program information or subprogram information from the second program signal, and time information to keep each program information continuous. Is to be replaced.
[0020]
Next, the recording / reproducing unit 105 reproduces the main program information based on the control of the control unit 117, outputs the reproduction signal to the terminal a of the changeover switch 107 and sends it to the header separation unit 129. The recording / playback unit 106 plays back the subprogram information based on the control of the control unit 117 and outputs the playback signal to the terminal a of the changeover switch 108.
Note that the recording / reproducing units 105 and 106 may be integrated, as long as the recording area of the recording medium is separate. In addition, a recording medium that can perform writing and reading simultaneously is used.
[0021]
Next, the control unit 117 controls the recording / reproducing units 105 and 106 based on the main program header and the subprogram header included in the first header separated by the header separation unit 129, and synchronizes with the main program information. While reading the sub program information. Alternatively, when it is desired to display only the main program or only the subprogram, only the main program information or only the subprogram information is continuously read out.
[0022]
The switches 107 and 108 are switched under the control of the control unit 117, and when it is desired to display the first program signal currently broadcasted, it is desired to display the second program signal connected to the terminal b and delayed. When connected to terminal a. Outputs from the switches 107 and 108 are decoded by the decoding units 109 and 110.
[0023]
When displaying the second program signal, the image signals of the main program information and the sub program information decoded by the decoding units 109 and 110 are combined by the picture-in-picture unit 111 and displayed on the display device 115. . At the same time, the audio signals of the main program information and the sub program information are output to the terminals a and b of the switch 112, switched by the control unit 117, and sent to the speaker 113.
[0024]
FIG. 2B shows the recording state of the main program recorded by the recording / playback unit 105. In this case, main program information and a first header including a main program header and a subprogram header are recorded. FIG. 2C shows the recording state of the subprogram recorded in the recording / playback unit 106. In this case, the subprogram information and the second header including the subprogram header are recorded. By recording in this way, when the main program is continuously reproduced, the subprogram information can be read from the recording / reproducing unit 106 at the same time when the subprogram header is read, and the subprogram is synchronized with the main program. Can be displayed simultaneously. It is also possible to watch the main program or only the sub-program by continuous playback.
[0025]
FIG. 3 shows the time relationship when the sub-program is displayed simultaneously with the main program. Subprograms are displayed simultaneously from the time when they were inserted into the main program.
[0026]
FIG. 4 shows a display state when the main program and the subprogram are simultaneously displayed on the display device 115. The main program of 4: 3 is displayed on the display screen with an aspect ratio of 16: 9, and the subprogram is displayed in the margin area. The case where a program is displayed is shown.
[0027]
On the other hand, when it is desired to display the first program signal currently being broadcast, the first program signal from the tuner unit 103 is sent to the decoding units 109 and 110 via the terminals b of the switches 107 and 108, where After each image signal and each audio signal of the main program information and subprogram information are decoded, each image signal is synthesized by the picture-in-picture unit 111 and displayed on the display device 115, and each audio signal is displayed on the terminal a of the switch 112. Or it is sent to the speaker 113 via b.
[0028]
1 may be configured as a hardware system or a computer system including a CPU, a memory, and the like. When configured in a computer system, the memory constitutes a storage medium according to the present invention. The storage medium stores a program for executing the processing procedure for controlling the above-described operation. As the storage medium, a semiconductor memory such as ROM or RAM, an optical disk, a magneto-optical disk, a magnetic medium, or the like may be used. These may be a CD-ROM, a floppy disk, a magnetic tape, a magnetic card, a nonvolatile memory card, or the like. It may be configured and used.
[0029]
【The invention's effect】
According to the present invention, both main program information and subprogram information multiplexed in one bit stream can be reproduced separately, and subprogram information can be reproduced simultaneously in synchronization with the main program. Is possible.
[Brief description of the drawings]
FIG. 1 is a block diagram of a recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of a bitstream according to an embodiment of the present invention.
FIG. 3 is a block diagram showing the display timing of main program information and subprogram information.
FIG. 4 is a configuration diagram illustrating an example of a display state.
FIG. 5 is a block diagram of a conventional delayed regeneration measure.
[Explanation of symbols]
103 Tuner 105, 106 Recording / playback unit 107, 108, 112, 123 Changeover switch 111 Picture-in-picture unit 113 Speaker 115 Display device 117, 119 Control unit 125, 126 Header addition unit

Claims (2)

A recording / reproducing apparatus that processes a bit stream output from a tuner unit that receives a broadcast wave and records the bit stream in a recording unit,
Separating means for separating program information included in the bit stream output from the tuner unit and header information related to the program information;
Control means for executing control for generating new header information to be added to the program information separated by the separation means from the header information separated by the separation means,
When the main program header information related to the main program information and the main program information and the sub program header information related to the sub program information and the sub program information are time-division multiplexed in the bitstream, the control means is the separating means. Based on the separated main program header information and subprogram header information, the bitstream is divided into a bitstream of the main program information and a bitstream of the subprogram information, and a bitstream of the main program information In the recording / reproducing apparatus, the main program header information and at least one sub program header information are added. Reproducing means for reading out and reproducing the bit stream recorded in the recording unit,
The control means acquires the subprogram header information added to the bit stream of the main program information read and reproduced by the reproduction means, and reproduces the subprogram information in parallel with the main program information. The recording / reproducing apparatus according to claim 1, wherein the control is executed.

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