KR20070057499A - A timeshift mode driving apparatus and method in a pvr system - Google Patents

Abstract

An apparatus and a method for driving a time shift mode of a PVR(Personal Video Recorder) system are provided to simplify the system and decrease reproduction failure by storing and reproducing data by use of a PID(Packet Identifier) value set in advance when the system is driven under a time shift mode. The first demultiplexing part(102) divides a transport stream received via a tuner(100) into a video packet, an audio packet and PSIP(Program and System Information Protocol) data at a time shift mode. A PID searching part(104) searches PID values of the video and audio packets, based on the PSIP data outputted from the first demultiplexing part. A PID changing part(106) changes the PID values of the video and audio packets. A multiplexing part(108) multiplexes the video and audio packets outputted from the first demultiplexing part by using the changed PID values and converts the video and audio packets into one transport stream. The second demultiplexing part(110) divides the converted transport stream into video and audio packets by using a PID value set in advance. A decoder(112) decodes the video and audio packets outputted from the second demultiplexing part.

Description

 Time shift driving device and method of PPR system {A TIMESHIFT MODE DRIVING APPARATUS AND METHOD IN A PVR SYSTEM}

1 is a block diagram illustrating an apparatus for driving a time shift mode of a PVR system according to the present invention.

2 is a flowchart illustrating a time shift mode driving process of a PVR system according to an exemplary embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

100: tuner 102: first demux part

104: PID search unit 106: PID change unit

108: mux part 110: second demux part

112: decoder 114: microcomputer

120: hard disk

The present invention relates to a PVR system, and more particularly, to an apparatus and method for driving a PVR system in a time shift mode.

In general, a TV is included in a video display device. The TV is tuned and demodulated into a voice and a video by selecting and demodulating a broadcast signal according to a channel selected by a user among broadcast signals transmitted from a broadcasting station, and performing a screen through corresponding audio and video processing. And an image device output through a speaker.

Recently, with the development of TV technology and the transmission of the broadcasting signal, the interest in the digital TV is increasing in the digital display method of the video display device.

Also, in Korea, Mugunghwa satellite was launched in August 1995 and began digital test broadcasting in July 1996. Unlike the existing satellite broadcasting, Mugunghwa satellite broadcasting is a terrestrial digital that is scheduled to be SDTV-class digital broadcasting. It's almost no different from broadcasting.

The digital TV has a function of storing a video in real time by using a personal video recorder (PVR) while the user is watching a broadcast, and playing the video at a desired time. In addition, it can be used for recording meetings when conducting video conference using digital TV.

Such a PVR system is a personal digital video recording device for recording and playing back information on a hard disk. Unlike VCRs that store video signals on magnetic tapes, these PVR systems are a new concept of digital recording equipment that records and plays back information on hard disks. It is the next generation recording device that can record a certain amount of broadcast program.

That is, the PVR system converts digital broadcast data and analog broadcast data received through a broadcast channel from a TV system through a CPU and a video signal processor, and converts the digital signal data in a memory device inside the system and stores the converted digital signal data. D is a system that can be converted and played back at a time or method desired by the user via a display device or screen.

Internal functions include broadcast program reservation recording method and time shift method, and a hard disk is used as a storage space used in the PVR built-in TV system.

In addition, the PVR system tunes a channel by identifying channel identification information of the channel in order to move to a channel selected by a user during image playback or image storage.

The channel identification information includes various channel information such as a channel number and a channel broadcast name, and includes a packet identifier of a broadcast signal for a channel (hereinafter referred to as a "PID"), and synchronization of an audio signal and a video signal included in the broadcast signal. It includes the PID of the clock signal for. This PID information is included in the transport stream received from the tuner.

The time shift function of the PVR system stores a received broadcast signal, that is, a transport stream on a hard disk, and reads and decodes the transport stream from the hard disk when a request to play data stored on the hard disk is received. It is broadcast on TV.

In general, when a PVR system stores a transport stream on a hard disk for time shift or storage purposes, the PVR system stores the transport stream received through the tuner on the hard disk without a special processor.

On the other hand, when the user changes the channel or the PSIP version of the broadcast program is changed while the time shift function is activated, the PID of video and audio is changed. In the state where the time shift function is activated, the conventional PVR system monitors the PSIP. The problem is that it does not execute immediately, which causes the data stored temporarily on the hard disk, i.e., video and audio signals, to be decoded properly.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art, and when the time shift mode is driven, the PID value of the video and audio is changed to a preset PID value, stored in the hard disk, and then reproduced as a preset PID value. By demuxing and reproducing, there is provided a time shift driving apparatus and method of a PVR system capable of storing and reproducing data using a preset PID value without scanning the channel when the channel is changed or the PSIP is changed.

In order to achieve the above object, the present invention provides a PVR system for recording and reproducing a transport stream received through a tuner to a storage medium, wherein the transport stream received from the tuner in the time shift mode includes a video, an audio packet, A first demux unit for separating and outputting a PSIP, a PID retrieval unit for retrieving PID values of the video and audio packets based on the PSIP output to the first demux unit, and a preset PID A PID change unit for changing the PID value of the video and audio packet by changing the value, and muxing the video and audio packet separately outputted from the first demux unit using the PID value changed by the PID change unit. A mux unit for converting the transport stream to the storage medium and outputting the converted stream to the storage medium, and converting the transport stream to the storage medium. When a request for reproducing data stored in the storage medium is received during the loading process, the second transport outputting the converted transport stream from the storage medium into video and audio packets by using the preset PID value. And a decoder configured to decode and reproduce the video and audio packets output from the second demux unit based on the preset PID value.

The present invention also provides a method of driving a time shift mode of a PVR system for storing a transport stream received through a tuner on a storage medium or reproducing the transport stream, a) a transformer received at the tuner during the time shift mode. Separating the port stream into video, audio packets, and PSIP; b) extracting PID values of the video and audio packets based on the PSIP; and c) changing the extracted PID values to preset PID values. Changing PID values of the video and audio packets; d) muxing the separated video and audio packets using the changed PID values, converting one transport stream, and storing the transport streams in the storage medium; And e) receiving a request for reproducing data stored in the storage medium during the process of storing the converted transport stream. When the converted transport stream provided from the storage medium is separated into audio and video packets using the preset PID value, f) is separated and output in step e based on the preset PID value. Decoding and playing the video and audio packets.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating an apparatus for driving a time shift mode of a PVR system according to the present invention.

Referring to FIG. 1, a PVR system is a system for recording and playing back a transport stream received through a tuner 100 to a hard disk 120 which is a storage medium. The first demux unit 102 and the PID search unit 104, a PID changing unit 106, a mux unit 108, a second demux unit 110, a decoder 112, and a microcomputer 114.

The first demux 102 is tuned by the tuner 100 to separate and output a broadcast signal, that is, a transport stream, received on the corresponding broadcast channel into a video, an audio packet, and a PSIP. At this time, the video and audio packets are output to the decoder 114 or to the mux unit 108 under the control of the microcomputer 114.

The PID retrieval unit 104 retrieves PID values of video and audio packets based on the PSIP output from the first demux unit 102.

The PID changing unit 106 changes the retrieved PID value into a preset PID value (system setting value), changes the PID value of the video and audio packet, and outputs the PID value to the mux unit 108.

The mux unit 108 is driven under the control of the microcomputer 114, that is, when the PVR system is driven in the time shift mode, and the PID value changed by the PID changing unit 106 and the separated output from the first demux unit 102 are output. The video and audio packets are muxed and converted into one transport stream and then output to the hard disk 108.

When the second demux unit 110 is driven under the control of the microcomputer 114, that is, when a reproduction request for data stored in the hard disk 120 is received during the process of storing the converted transport stream on the hard disk 120, The transport stream output from the hard disk 120 is separated into video and audio packets using a preset PID value and output to the decoder 112. At this time, the reproduction request is a trick reproduction, that is, a reproduction request for a previous broadcast or a broadcast request currently being received instead of a broadcast currently being received.

The decoder 112 decodes and plays the video and audio packets output from the second demux 110 based on the preset PID value.

The microcomputer 114 controls the overall functions of the PVR system. In particular, when the time shift mode is driven, the microcomputer 114 drives the PID change unit 106 and the mux unit 108 to display video and audio packets currently being received using a preset PID value. After muxing into one transport stream, it is stored in the hard disk 120, the hard disk 120 is controlled according to a reproduction request, and the corresponding transport stream is withdrawn, and the second demux unit 110 and The decoder 112 is driven to decode and play the video and audio packets from the transport stream drawn from the hard disk 120 using the preset PID value.

A process of driving the PVR system having the above configuration in the time shift mode will be described with reference to FIG. 2.

2 is a flowchart illustrating a time shift mode driving process of a PVR system according to an exemplary embodiment of the present invention.

Referring to FIG. 2, first, when the PVR system is driven in the time shift mode (S200), the first demux unit 102 may control the transport stream received from the tuner 100 under the control of the microcomputer 114. The packet is divided into PSIP and output, and the microcomputer 114 drives the PID change unit 106 to change the PID value retrieved from the PID search unit 104 into a preset PID value and output the result to the mux unit 108 ( S202).

Accordingly, the mux unit 108 converts the PID values of the video and audio packets based on the preset PID value, muxes them, converts them into one transport stream, and stores them in the hard disk 120 (S204).

While performing the above steps S202 and S204, the microcomputer 114 determines whether a data reproduction request is received from the user (S206).

As a result of the determination in step S206, when the data reproduction request is received, the microcomputer 114 drives the hard disk 120 to retrieve the data requested for reproduction and then provides it to the second demux unit 110. Accordingly, the second demux unit 110 separates the video and audio packets from the data drawn from the hard disk 120 using the preset PID value and outputs the video and audio packets to the decoder 112 (S208).

The decoder 112 decodes the audio and video packets separated and output from the second demux unit 110 based on a preset PID value, thereby reproducing the requested data (S210 and S212).

According to the present invention, when the PVR system is driven in the time shift mode, the PID value of the video and audio is changed to a preset PID value, stored in the hard disk 120, and then demuxed to the preset PID value for playback. By doing so, when the channel is changed or the PSIP is changed during the time shift mode driving, data can be stored and reproduced using a preset PID value without scanning.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

As described above, according to the present invention, when the PVR system is driven in the time shift mode, the PID value of the video and audio is changed to a preset PID value, stored in the hard disk, and then demuxed and played back to the preset PID value during playback. In this case, when the channel is changed or the PSIP is changed during the time shift mode, data can be stored and played back using a preset PID value without scanning the data, thereby simplifying the system and reducing playback failures. .

Claims (2)

A PVR system for recording and playing back a transport stream received through a tuner on a storage medium. A first demux unit for separating and outputting a transport stream received by the tuner in a time shift mode into a video, an audio packet, and a PSIP; A PID search unit searching for PID values of the video and audio packets based on the PSIP output to the first demux unit; A PID change unit for changing the PID value of the video and audio packet by changing the retrieved PID value into a preset PID value; A mux unit which muxes the video and audio packets separated and output from the first demux unit by using the PID value changed by the PID change unit, converts the video and audio packets into one transport stream, and outputs them to the storage medium; When a request for reproducing data stored in the storage medium is received during the process of storing the converted transport stream on the storage medium, the converted transport stream, which is withdrawn from the storage medium, is stored using the preset PID value. A second demux unit for separating and outputting the audio packet; A decoder for decoding and playing the video and audio packets output from the second demux based on the preset PID value. Apparatus for driving a time shift mode of a PVR system. A method of driving a time shift mode of a PVR system for storing a transport stream received through a tuner on a storage medium or reproducing the transport stream, a) separating the transport stream received by the tuner into video, audio packets and PSIP in the time shift mode; b) extracting PID values of the video and audio packets based on the PSIP; c) changing the PID value of the video and audio packet by changing the extracted PID value to a preset PID value; d) muxing the separated video and audio packets using the changed PID value, converting one transport stream and storing the same in the storage medium; e) When a request for reproducing data stored in the storage medium is received during the process of storing the converted transport stream, the converted transport stream provided from the storage medium is output using the preset PID value. Separating it into packets, f) decoding and playing the video and audio packets separated and output in step e based on the preset PID value; Method of driving the time shift mode of the PVR system comprising a.

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