KR100737071B1 - A timeshift mode driving apparatus and method in a pvr system - Google Patents

Abstract

The apparatus for driving a time shift mode of the PVR system according to the present invention outputs a first control signal when the user wants to watch the current broadcast while in the time shift mode, and outputs a second control signal when the user wants to watch the previous broadcast while in the time shift mode. PID values of the video and audio packets are calculated based on the output microcomputer, the first demux unit separating the transport stream received from the tuner into video, audio packets and PSIP, and the PSIP output from the first demux unit. A PID searching unit for searching, a PID changing unit for changing the PID value of the video and audio packets by changing the searched PID value to a preset value, and a first demux unit in time shift mode in response to the first control signal. It receives the video and audio packets and the changed PID value which are output separately and provides them to the hard disk and the decoder, and responds to the second control signal. The PID unit receives the video and audio packets separately output from the first demux unit and the changed PID value and outputs them to the hard disk; and the PID unit operates the transport stream output from the hard disk in accordance with the second control signal. The second demux unit separates the video and audio packets and outputs them to the decoder.

PVR, time shift, PID, PSIP

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: buffer unit 110: second demux unit

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 time shift mode of a PVR system.

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.

The conventional method for solving the above problems is to decouple the PID value from the transport stream using a demux, change the PID value to a preset value, and modify the changed PID value and video and audio signals to mutate the PID. Create a transport stream with the values and save it to your hard disk. If the user requests playback of data stored on the hard disk during this process, the PVR system separates the converted transport stream into video, audio, and PID values using another demux, and then uses the changed PID values to output the video and audio signals. Decode and output

However, the above-described conventional method has a problem in that the internal structure of the system is complicated as well as the manufacturing cost is increased because two demuxes are required for the PVR system to operate in the time shift mode.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art, and 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 and stored in the buffer unit. Apparatus and method for driving a time shift mode of a PVR system that decodes and plays video and audio packets stored in a buffer unit at a preset PID value or retrieves corresponding data from a hard disk and demuxes them after playing them during recording. To provide.

In order to achieve the above object, the present invention is a PVR system for decoding a transport stream received through a tuner to output to a display device or to record on a hard disk, a time shift mode and to watch the current broadcast In this case, the first control signal is output and the microcomputer outputs the second control signal when the previous broadcast is to be watched in the time shift mode, and the transport stream received from the tuner is separated into video, audio packets, and PSIP. A first demux unit, a PID search unit for searching PID values of the video and audio packets based on the PSIP output from the first demux unit, and changing the searched PID value to a preset value to convert the video and A PID change unit for changing a PID value of an audio packet, and the time in response to the first control signal In the shift mode, the first demux unit receives the video and audio packets separately outputted from the first demux unit and the changed PID value to the hard disk and the decoder, and responds to the second control signal. The buffer unit receives the video and audio packets and the modified PID value and outputs the modified PID value to the hard disk, and transmits the transport stream output from the hard disk according to the second control signal. Using a second demux to separate the video and audio packets and output them to the decoder.

The present invention also provides a method of driving a time shift mode of a PVR system that stores a transport stream received through a tuner on a hard disk or decodes the transport stream to a display device, the method comprising: a) a transformer received by the tuner; Separating the port stream into video, audio packets, and PSIP; b) retrieving PID values of the video and audio packets based on the PSIP; and c) changing the retrieved PID values to predetermined values. Changing the PID value of the audio packet; d) storing the video and audio packet in which the PID value is changed; and e) storing the video and audio packet in the time shift mode. The video and audio packets stored in the unit are stored in the hard disk and decoded into the preset PID values. And f) storing the video and audio packets stored in the buffer unit on the hard disk, and storing the data to be played on the hard disk when the trick play is requested in the time shift mode. Demuxing the audio and video packets by demuxing the PID values, and g) decoding and playing the video and audio packets separated in step f based on the preset PID values.

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

1 is a flowchart illustrating a time shift recording apparatus of a PVR system according to the present invention.

Referring to FIG. 1, a time shift recording apparatus of a PVR system may decode a transport stream received through a tuner 100 to a decoder and output the same to a display device (not shown) or to record on a hard disk 120. The first demux unit 102, the PID searching unit 104, the PID changing unit 106, the buffer unit 108, the second demux unit 110, the decoder 112, and the microcomputer 114 are connected to each other. Include.

The microcomputer 114 receives various requests from the user to control the overall functions of the PVR system. In particular, the microcomputer 114 outputs the first control signal when the user wants to watch the current broadcast in the time shift mode, and views the previous broadcast in the time shift mode. If desired, the second control signal is output.

Here, the buffer unit 108 outputs the audio and video packets changed to the preset PID value to the decoder 112 and the hard disk 120 according to the first control signal, and the preset PID value according to the second control signal. The changed audio and video packets are output to the hard disk 120.

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.

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 buffer unit 108.

The buffer unit 108 stores the video and audio packets separated and output from the first demux unit 102 and the PID values changed by the PID change unit 106. The hard disk 120 is controlled by the microcomputer 114. Or) and / or output the data stored in the decoder (112).

The second demux unit 110 is driven based on the second control signal of the microcomputer 114 to separate the transport stream output from the hard disk 120 into video and audio packets using a preset PID value to decode the decoder. Output to (112).

The decoder 112 decodes and plays the video and audio packets output from the second demux 110 based on 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 a 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 buffer value to the buffer unit 108 ( S202).

Accordingly, the buffer unit 108 sequentially outputs the video and audio packets changed to the preset PID value under the control of the microcomputer 108 to the hard disk 120, and stores them in the hard disk 120 (S204).

While performing steps S202 and S204 as described above, the microcomputer 114 determines whether a playback request is received for broadcasting during reception (S206).

As a result of the determination in step S206, when a playback request for a broadcast currently received and being stored in the hard disk 120 is received, the microcomputer 114 applies the first control signal to the buffer unit 108 and accordingly, the buffer unit ( 108 outputs video and audio packets to the decoder 112 and outputs them to the hard disk 120 (S208).

The decoder 112 decodes and plays the video and audio packets output from the buffer unit 108 based on the preset PID value (S210).

As a result of the determination in step S206, when the trick play request is received, the microcomputer 114 applies the second control signal to the buffer unit 108 to prevent the data stored in the buffer unit 108 from being output to the decoder 112. In addition to controlling 108, the hard disk 120 is driven to extract data requested for reproduction, and then the data is provided to the second demux unit 110. Accordingly, the second demux 110 separates the video and audio packets from the data drawn from the hard disk 120 using the preset PID value and outputs them to the decoder 112 (S212).

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 data requested for reproduction (S214 and S210).

According to the present invention, when the PVR system drives the time shift mode, the PID value of the video and audio is changed to a preset PID value, stored in the buffer unit 108, and then stored in the hard disk 120. The data stored in the decoder 112 is decoded and reproduced with a preset PID value, or any data among the stored data of the hard disk 120 is demuxed and reproduced with a preset PID value, thereby driving a mux when driving the time shift mode. You can implement this function with only two demuxes without using.

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 buffer unit, and stored in the hard disk. By decoding and playing the video and audio packets stored in the preset PID value, or by extracting the data from the hard disk and then demuxing them, the mux can be omitted when implementing the time shift mode, thereby reducing the manufacturing cost of the system. have.

Claims (2)

A PVR system that decodes a transport stream received through a tuner and outputs it to a display device or records on a hard disk. A microcomputer outputting a first control signal when the user wants to watch the current broadcast while in the time shift mode, and a second control signal that outputs a second control signal when the user wants to watch the previous broadcast while in the time shift mode; A first demux unit for separating and outputting the transport stream received by the tuner into a video, an audio packet, and a PSIP; A PID search unit for searching PID values of the video and audio packets based on the PSIP output from the first demux unit; A PID change unit which changes the PID value of the video and audio packets by changing the retrieved PID value to a preset value; In the time shift mode in response to the first control signal, a video and audio packet separated from the first demux unit and the changed PID value are provided to the hard disk and the decoder, and the second control is performed. A buffer unit for receiving the video and audio packets separately output from the first demux unit and the changed PID value in response to a signal and outputting the changed PID values to the hard disk; A second demux unit operating according to the second control signal and dividing the transport stream output from the hard disk into video and audio packets using the preset PID value and outputting the video stream to the decoder; Apparatus for driving a time shift of a PVR system. A method of driving a time shift mode of a PVR system that stores a transport stream received through a tuner on a hard disk or decodes the transport stream to a display device. a) separating the transport stream received at the tuner into video, audio packets and PSIP, b) retrieving 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 retrieved PID value to a preset value; d) storing video and audio packets in which the PID value is changed, in a buffer unit; e) storing the video and audio packets stored in the buffer unit in the hard disk and decoding and outputting the preset PID values when the user wants to watch the currently received broadcast in the time shift mode; f) in the time shift mode and when the trick play is requested, the video and audio packets stored in the buffer unit are stored in the hard disk, and the data to be played the trick on the hard disk are demuxed to the preset PID value. Separating the audio and video packets, g) decoding and playing the video and audio packets separated in step f based on the preset PID value; Time shift driving method of the PVR system comprising a.

Images