JP3634697B2 - Digital television receiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital television receiver.
[0002]
[Prior art]
In order to view the digital TV video received by the viewer again, conventionally, it has been necessary to record the decoded video and audio in the VTR and reproduce them on the VTR.
[0003]
By the way, when the viewer does not record by the VTR and the application for the sweepstakes or the recipe of the cooking is aired, the viewer may miss the details.
[0004]
In addition, when the viewer does not record by the VTR, the viewer may urgently save important scenes and want to view them again.
[0005]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to provide a digital television receiver capable of viewing a missed scene again.
[0006]
An object of the present invention is to provide a digital television receiver that can store important scenes and view them again.
[0007]
[Means for Solving the Problems]
According to a first digital television receiver of the present invention, an encoded video signal is input, and an input code is input according to time information indicating a decoding time and a presentation time included in the input encoded video signal. Video decoder that decodes and presents the encoded video signal, and the encoded audio signal is input, and is input according to the time information indicating the decoding time and the presentation time included in the input encoded audio signal in the digital television receiver and a voice decoder to present by decoding the encoded audio signal, the marks Goka video signal separated from the transport stream, the memory for image storage and sends to the video decoder means for saving cyclically, the memory for voice store and sends the marks Goka audio signal separated from the transport stream, to the speech decoder Means for storing cyclically, when entered playback instruction from the viewer, stops the transmission from the transport stream to the separated encoded video signal and a video decoder of the coded speech signal and the speech decoder together it is, writing to the image storing memory and the voice storage memory is stopped, reading means to read out by repeating the coded video signal and the encoded audio signal stored in the memory and the voice storage memory for image storage The time information updating means for replacing the time information included in each of the encoded video signal and the encoded audio signal read by the reading means with the reproduction time information suitable for the current system clock, and the time information updating means The encoded video signal with the updated time information is sent to the video decoder, and the time information update means Coded speech signal time information is updated, characterized in that it comprises means for sending to the speech decoder.
[0008]
According to a second digital television receiver of the present invention, an encoded video signal is input, and an input code is input according to time information indicating a decoding time and a presentation time included in the input encoded video signal. Video decoder that decodes and presents the encoded video signal, and the encoded audio signal is input, and is input according to the time information indicating the decoding time and the presentation time included in the input encoded audio signal In a digital television receiver comprising an audio decoder for decoding and presenting an encoded audio signal, the encoded video signal separated from the transport stream is sent to the video decoder, and the transport stream in a state in which coded audio signal separated from it is transmitted to the audio decoder, when the save command from the viewer is inputted The marks Goka video signal separated from the transport stream, together and writes in the memory for image storage and at the same time sent to the video decoder, upon sending the marks Goka audio signal separated from the transport stream to the audio decoder Means for simultaneously writing to the audio storage memory and stopping writing of the encoded video signal and the encoded audio signal to the memory when either the video storage memory or the audio storage memory becomes full When a playback command is input from the viewer, transmission of the encoded video signal and encoded audio signal separated from the transport stream to the video decoder and audio decoder is stopped, and the video storage memory and audio reading means for to read out by repeating the coded video signal and the encoded audio signal stored in the storage memory, the reading means Time information updating means for replacing the time information contained in each of the encoded video signal and the encoded audio signal read out to the time information for reproduction adapted to the current system clock, and the time information by the time information updating means Is provided with a means for sending the encoded video signal with the updated time information to the video decoder and sending the encoded audio signal with the time information updated by the time information updating means to the audio decoder .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows the configuration of the main part of a digital television receiver.
[0010]
The encoded video signal extraction unit 1 extracts an encoded video signal from a transport stream (MPEG2TS signal) obtained by digital demodulation. The encoded audio signal extraction unit 2 extracts the encoded audio signal from the transport stream.
[0011]
The signals extracted by the encoded video signal extracting unit 1 and the encoded audio signal extracting unit 2 are signals in a format called PES stream, and the time to be decoded (DTS) and the time to be presented (PTS) are PES streams. It is described in.
[0012]
The system clock generator 3 generates a reference time, and the video decoder 16 and the audio decoder 26 perform a decoding process and a presentation process based on the reference time. For example, when the system clock reaches the DTS of the video PES stream, the video decoder 16 decodes the video PES stream, and when the system clock reaches the PTS of the video PES stream, the video decoder 16 presents the decoded video.
[0013]
When the viewer is watching the broadcast, the outputs of the encoded video signal extracting unit 1 and the encoded audio signal extracting unit 2 are input to the video decoder 16 and the audio decoder 26, respectively. Each decoder 16 and 26 performs a decoding process and a presentation process according to the DTS and PTS in the PES stream, and outputs video and audio.
[0014]
In this receiver, as an operation mode, an overlooked scene playback mode for allowing a missed scene to be viewed again, and an important scene for allowing an important scene to be saved and viewed again There is a save mode. The viewer can set one of the operation modes.
[0015]
[1] Explanation of operation when the missed scene playback mode is set
The operation when the missed scene playback mode is set will be described. When the missed scene playback mode is set, a write command is always sent from the microcomputer 5 to the memory controller 14 that controls the video buffer 12 and the memory controller 24 that controls the audio buffer 22. .
[0017]
The pre-buffer 11 temporarily stores the PES stream obtained by the encoded video signal extraction unit 1, and writes the PES stream in the subsequent video buffer 12 for each unit that can be decoded.
[0018]
The video buffer 12 sequentially writes the PES stream supplied from the pre-buffer 11 and, when reaching the final address of the video buffer 12, writes the PES stream supplied thereafter from the head address of the buffer 12. Go. As described above, since the PES stream in the video buffer 12 is sequentially updated, the latest PES stream is always stored in the video buffer 12.
[0019]
The pre-buffer 21 temporarily stores the PES stream obtained by the encoded audio signal extraction unit 2, and writes the PES stream for each unit that can be decoded in the audio buffer 22 at the subsequent stage.
[0020]
The audio buffer 22 sequentially writes the PES stream supplied from the pre-buffer 21. When the final address of the audio buffer 22 is reached, the PES stream supplied thereafter is written from the head address of the buffer 22. Go. Thus, since the PES stream in the audio buffer 22 is sequentially updated, the latest PES stream is always stored in the audio buffer 22.
[0021]
When it is desired to reproduce a scene that the viewer has missed, a reproduction command is input using a remote controller (not shown). This reproduction command is input to the microcomputer 5. When the reproduction command is input, the microcomputer 5 switches the switches 15 and 25 to the reproduction signal side (the side that selects the output of the time information update units 13 and 23) and sends a read command to both the memory controllers 14 and 24. send.
[0022]
When the memory controllers 14 and 24 receive the read command, the memory controllers 14 and 24 stop writing the PES stream to the buffers 12 and 22, and in the order in which the data is written from the buffers 12 and 22 to the buffers 12 and 22 (from the oldest one) Read the PES stream in order). If the last written PES stream is read from the buffers 12 and 22, it is read again from the first written PES stream. In this manner, the PES stream is repeatedly read from the buffer memories 12 and 22.
[0023]
The PTS and DTS time information stored in the buffers 12 and 22 remains the values stored in the buffers 12 and 22. In order to make these pieces of time information match the current system clock, the reproduction time information generation unit 4 generates reproduction time information, and time information update units 13 and 23 subsequent to the buffers 12 and 22. Send to.
[0024]
The time information update units 13 and 23 replace the time information of the PES stream output from the buffers 12 and 22 with the reproduction time information generated by the reproduction time information generation unit 4.
[0025]
PES streams that are read from the buffers 12 and 22 and whose time information has been replaced by the time information update units 13 and 23 are sent to the decoders 16 and 26 via the switches 15 and 25. Thereby, the missed scene is repeatedly presented. In order to return to the normal state, the viewer may input a reproduction stop command.
[0026]
[2] Explanation of operation when the important scene storage mode is set
The operation when the important scene storage mode is set will be described. When the important scene storage mode is set, a write command is not always sent from the microcomputer 5 to the memory controller 14 that controls the video buffer 12 and the memory controller 24 that controls the audio buffer 22. .
[0028]
Although the PES stream obtained by the encoded video signal extraction unit 1 is supplied to the video buffer 12 via the prebuffer 11, the PES stream is not written to the video buffer 12.
[0029]
Similarly, the PES stream obtained by the encoded audio signal extraction unit 2 is supplied to the audio buffer 22 via the prebuffer 21, but the PES stream is not written to the audio buffer 22.
[0030]
When the viewer wants to save an important scene, a save command is input by a remote controller (not shown). This save command is input to the microcomputer 5. When the save command is input, the microcomputer 5 sends a write command to both the memory controllers 14 and 24.
[0031]
When both the memory controllers 14 and 24 receive the write command, the PES streams supplied from the pre-buffers 11 and 21 to the buffers 12 and 22 respectively are written into the buffers 12 and 22 from the head addresses. When one of the buffers 12 and 22 is full (when the PES stream is written up to the final address in any buffer), the writing of the PES stream to both the buffers 12 and 22 is stopped.
[0032]
When the viewer wants to reproduce an important scene, a reproduction command is input by a remote controller (not shown). This reproduction command is input to the microcomputer 5. When the reproduction command is input, the microcomputer 5 switches the switches 15 and 25 to the reproduction signal side (the side that selects the output of the time information update units 13 and 23) and sends a read command to both the memory controllers 14 and 24. send.
[0033]
When the memory controllers 14 and 24 receive the read command, the writing of the PES stream to the buffers 12 and 22 is stopped, and the buffers 12 and 22 are written into the buffers 12 and 22 in the order of writing (from the oldest one). Read the PES stream in order). If the last written PES stream is read from the buffers 12 and 22, it is read again from the first written PES stream. In this manner, the PES stream is repeatedly read from the buffer memories 12 and 22.
[0034]
The PTS and DTS time information stored in the buffers 12 and 22 remains the values stored in the buffers 12 and 22. In order to make these pieces of time information match the current system clock, the reproduction time information generation unit 4 generates reproduction time information, and time information update units 13 and 23 subsequent to the buffers 12 and 22. Send to.
[0035]
The time information update units 13 and 23 replace the time information of the PES stream output from the buffers 12 and 22 with the reproduction time information generated by the reproduction time information generation unit 4.
[0036]
PES streams that are read from the buffers 12 and 22 and whose time information has been replaced by the time information update units 13 and 23 are sent to the decoders 16 and 26 via the switches 15 and 25. As a result, important scenes that the viewer has determined to be important and stored are repeatedly presented. In order to return to the normal state, the viewer may input a reproduction stop command.
[0037]
【The invention's effect】
According to the present invention, a missed scene can be viewed again. Further, according to the present invention, an important scene can be stored and viewed again.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a main part of a digital television receiver.
[Explanation of symbols]
4 Playback time information generation unit 5 Microcomputer 11 Pre-buffer 12 Video buffer 13 Time information update unit 14 Memory controller 15 changeover switch 16 Video decoder 21 Prebuffer 22 Audio buffer 23 Time information update unit 24 Memory controller 25 Changeover switch 26 Speech decoder

Claims (2)

A video decoder that receives an encoded video signal and decodes and presents the input encoded video signal according to time information indicating a decoding time and a presentation time included in the input encoded video signal; A speech decoder that receives an encoded speech signal and decodes and presents the input encoded speech signal according to time information indicating a decoding time and a presentation time included in the input encoded speech signal In a digital television receiver equipped with
The marks Goka video signal separated from the transport stream, means for cyclically stored in a memory for image storage and sends to the video decoder,
The marks Goka audio signal separated from the transport stream, means for storing cyclically a speech storage memory and sends to the speech decoder,
When a playback command is input from the viewer, transmission of the encoded video signal and encoded audio signal separated from the transport stream to the video decoder and audio decoder is stopped, and the video storage memory and audio writing to the storage memory is stopped, reading means to read out by repeating the coded video signal and the encoded audio signal stored in the memory and the voice storage memory for image storage,
Time information updating means for replacing time information included in each of the encoded video signal and the encoded audio signal read by the reading means with reproduction time information adapted to the current system clock; and
Means for sending the encoded video signal whose time information has been updated by the time information update means to the video decoder, and for sending the encoded audio signal whose time information has been updated by the time information update means to the voice decoder;
A digital television receiver equipped with. A video decoder that receives an encoded video signal and decodes and presents the input encoded video signal according to time information indicating a decoding time and a presentation time included in the input encoded video signal; A speech decoder that receives an encoded speech signal and decodes and presents the input encoded speech signal according to time information indicating a decoding time and a presentation time included in the input encoded speech signal In a digital television receiver equipped with
In a state where the encoded video signal separated from the transport stream is sent to the video decoder and the encoded audio signal separated from the transport stream is sent to the audio decoder, a save command is sent from the viewer. when There is input, the marks Goka video signal separated from the transport stream, together and writes in the memory for image storage and at the same time sent to the video decoder, marks Goka voice separated from the transport stream The signal is sent to the audio decoder and written to the audio storage memory at the same time. When either the video storage memory or the audio storage memory is full, the encoded video signal and the encoded audio signal Means to stop writing to the memory ,
When a playback command is input from the viewer, transmission of the encoded video signal and encoded audio signal separated from the transport stream to the video decoder and audio decoder is stopped, and the video storage memory and audio storage are stopped. encoded signal and the encoded audio signal reading means to read out by repeating stored on use memory,
Time information updating means for replacing time information included in each of the encoded video signal and the encoded audio signal read by the reading means with reproduction time information adapted to the current system clock; and
Means for sending the encoded video signal whose time information has been updated by the time information update means to the video decoder, and for sending the encoded audio signal whose time information has been updated by the time information update means to the voice decoder;
A digital television receiver equipped with.

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