KR20030073143A - A fast searching playback method - Google Patents

Abstract

PURPOSE: A method for high speed searching and reproducing is provided to search a desired reproducing position precisely in a short time by searching child picture data recorded streams. CONSTITUTION: A high speed searching reproducing method includes the steps of storing broadcasting streams to a recording medium as parent picture data as a time shift watching command is received(40-44), extracting child picture data from the stored parent picture data periodically(46), reducing and storing the extracted child picture data to the recording medium(48,50), reading and displaying the stored child picture data in response to a child picture data display command(52,54), searching a position of the child picture displayed from the parent picture data as a reproducing command is received with a starting point from the displayed child picture(60), and reproducing and displaying the parent picture data from the searched child picture position(62).

Description

{A FAST SEARCHING PLAYBACK METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording system capable of timeshift viewing, and more particularly, to a method for quickly searching for and playing a position to be played by using a snapshot, which is a child video screen.

The hard disk drive, which is an auxiliary memory device of a computer system, can be accessed randomly, and the data transmission speed is high, and it can be cheaper and larger than other auxiliary memory devices. It is widely used as a random access storage device. A broadcast signal receiving system having a random access storage device is a system capable of time delay viewing at the same time as recording or reproducing a transport stream TS.

Such broadcast signal receiving systems include satellite TV signal set-top boxes and personal video recorders (PVRs). For example, general broadcast signal receiving systems have a recording function for time delay viewing and a function of simply recording a broadcast stream received from a channel other than the viewing channel. If the system user wants to search the memorable parts of the recorded stream and watch the repeated playback from that point, the user would like to find the desired position by searching the recorded stream at high speed conveniently and quickly. .

Accordingly, an object of the present invention is to provide a fast search and playback method in which a user searches for a desired playback position at high speed during playback of a recorded stream in a broadcast signal reception recording apparatus, and playback can be performed from the searched position.

It is still another object of the present invention to provide a broadcast signal receiving recording apparatus having a recording medium for time delay viewing, and to perform playback from the position after the user searches for a desired playback position at high speed during time delay viewing. The present invention provides a search reproduction method.

In addition, the present invention provides a high-speed search playback method that can provide the ease of search by marking the position information of the still image screen used for high-speed search in the display window that displays the total amount of the recorded video data (marking) have.

1 is a system configuration diagram of a satellite broadcasting receiver according to an embodiment of the present invention.

2 is a fast search and playback control flowchart using a child video screen according to an embodiment of the present invention.

3 is an exemplary view of a display screen according to an embodiment of the present invention.

4 is an exemplary view illustrating a display screen for explaining a self image location information display window according to an exemplary embodiment of the present invention.

In order to achieve the above object, a fast seek reproduction method of a broadcast signal reception recording apparatus according to an embodiment of the present invention is provided.

Storing a broadcast stream of a viewing channel as parent image data on the recording medium upon receiving a time delayed viewing command;

Periodically extracting self image data from the stored mother image data;

Reducing the extracted magnetic image data and storing the extracted magnetic image data on the recording medium;

Reading and displaying the stored magnetic image data in response to the own image display command;

Retrieving the position of the displayed magnetic image from the mother image data when a playback command having the displayed magnetic image as a starting point is received;

And displaying and reproducing the parent image data from the searched child image position.

The fast seek playback method according to another embodiment of the present invention,

Receiving a broadcast stream of a recording channel and storing the same as the parent image data on the recording medium;

Periodically extracting self image data from the parent image data being displayed;

Reducing the extracted magnetic image data and storing the extracted magnetic image data on the recording medium;

Reading and displaying previously stored magnetic image data in response to a magnetic image display command during reproduction of the recorded mother image data;

Retrieving the position of the displayed magnetic image from the mother image data when a playback command having the displayed magnetic image as a starting point is received;

And displaying and reproducing the parent image data from the searched child image position.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. For reference, in the embodiment of the present invention, an embodiment of the present invention will be described assuming only free broadcasting.

1 is a diagram illustrating a system configuration of a satellite broadcasting receiver as an example of a broadcast signal receiving and recording apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the antenna ANT receives a broadcast signal transmitted from a broadcast satellite BS. These antennas have very weak radio waves transmitted from broadcast satellites, so they should have high power gain, high efficiency, and minimize wind and snow effects. The converter 10 includes a low noise block-down converter (LBN), a waveguide, a polarotor, and the like, and transmits the radio wave received through the antenna to the channel unit 12 with low noise and high amplification.

The channel unit 12 selects a desired channel from the FM broadcast signal output from the converter 10 under the control of the controller 30, converts the selected analog broadcast signal into a digital signal, and performs demodulation and channel decoding. Output to the demultiplexer 14. The channel unit 12 may include a tuner, an A / D converter, a link IC, and the like.

The demultiplexer (DEMUX) 14 analyzes PID (Packet ID) information transmitted from satellites and performs demultiplexing to classify a video packet, an audio packet, and an additional information packet. In the case of a pay broadcasting stream, a broadcast signal is scrambled. Because of this, demultiplexing is performed after descrambling.

The demultiplexer 14 demultiplexes the video and audio signals into an MPEG A / V decoder 18. The MPEG A / V decoder 18 decodes the compressed digital signal and transmits the decoded digital signal to the audio D / A converter 22 and the NTSC encoder 24, respectively. The MPEG A / V decoder 18 is connected to a buffer memory 20 necessary for decoding the A / V stream.

The digital video signal decoded by the MPEG A / V decoder 18 is converted into an analog signal through the NTSC encoder 24 and then output as a video signal through the video mixing unit 28. The decoded digital audio signal is converted into an analog audio signal through an audio D / A converter 22 and outputted, and each of the output audio signals and video signals is provided to a TV receiver.

Meanwhile, the broadcast stream output from the channel unit 12 is stored in the form of a file in the HDD 16 under the control of the controller 30, and the broadcast stream stored in the HDD 16 is read again by the controller 30. Is applied to the demultiplexer 14.

The controller 30 controls the overall operation of the broadcast signal reception recording apparatus. The controller 30 includes a memory in which control program data for controlling the broadcast signal reception recording apparatus is stored. For reference, referring to the control operation of the controller 30, the controller 30 periodically extracts only an I picture from a video packet being decoded while performing a recording mode for time delay viewing, and extracts the extracted I picture. The image data is reduced and stored in the HDD 16 in sequence as child image data. In such a recording mode for time delay viewing, the broadcast stream of the viewing channel is stored in the HDD 16 as parent image data. When the display command of the self image data is received, the controller 30 reads out the corresponding self image data from the HDD 16 and transmits the same to the OSD unit 26.

The OSD (On Screen Display) unit 26 processes the input image data to be displayed on a sub-screen overlaid on a part of the main screen, and transmits it to the video mixing unit 28. The video data reproduced from the delayed viewing channel or the HDD 16 and the child video data are mixed and output as video signals.

Finally, a remote control receiver 32 is provided in the satellite broadcasting receiver for receiving a remote control signal radiated from the remote controller 34, which is a remote controller. The remote control receiver 32 decodes the received remote control signal and controls the controller. Send it to (32).

Hereinafter, a process of searching for and reproducing a desired position at a high speed during playback of a recording stream or time delay viewing in a satellite broadcasting receiver having the above-described configuration will be described in detail.

2 is a flowchart illustrating a fast search and playback control using a child video screen according to an embodiment of the present invention, and FIG. 3 illustrates a display screen according to an embodiment of the present invention. 4 illustrates a display screen for explaining a self image location information display window according to an exemplary embodiment of the present invention.

Referring to FIG. 2, assuming that a user selects one broadcast channel to watch a predetermined broadcast stream, in operation 40, an image screen of the received broadcast stream is displayed on a display device such as a TV receiver. In this state, when the user leaves the seat for a while, a command for viewing the time delay is issued through the remote controller 34. Accordingly, the controller 30 receives a time delay watching command. If the time delayed watching command is received (step 42), the controller 30 controls the HDD 16 to store the broadcast stream of the viewing channel input from the time delayed receiving time. In this case, the broadcast stream of the received viewing channel is displayed on the TV receiver as a main screen, and is recorded and stored on the hard disk surface of the recording medium as the parent image data. During this process, the controller 30 extracts the luminance signal and the color signal of the recently decoded I picture from the buffer data 20 periodically (for example, in units of 10 seconds) in the buffer memory 20 (step 46). The controller 30 reduces (48) the extracted I-picture image information to fit the sub-screen size in the same manner as decimation, and stores it on the HDD 16 as self-image data (50). As described above, the controller 30 periodically extracts the self image data of the I picture from the mother image data displayed on the TV receiver in the recording mode for time delay viewing, and stores the image data of the I picture on the hard disk.

When the self image display command is received through the remote controller receiver 32 in this storage process (step 52), the controller 30 reads out the last stored self image data in response to the sub image as shown in FIG. It is displayed, but it is displayed together with the self image location information display window (step 54). In this case, the main stream shown in FIG. 3 displays a broadcast stream currently being received with respect to the channel currently watching time delay. For reference, as shown in FIG. 4, in the self image location information display window A, the amount (time) of the parent image data stored in the hard disk is displayed in the form of a bar graph B, and the displayed bar graph ( In B), the position information of the own image data currently displayed as the sub-screen is displayed together in the form of a bar (C) to move within the bar graph. The number displayed on the right side of the child image position information display window A indicates the time difference between the image currently displayed on the main screen and the child image displayed on the subscreen. In addition, if there is a position information storage command of the child image displayed on the sub-screen, the position corresponding to the child image is marked (D) on the top of the bar graph (B) so that it can be used during playback.

On the other hand, through the sub-screen as shown in Figure 3, the user can search for the desired position in the parent image data recorded to date. That is, when the user issues a movement command of the magnetic image data displayed on the sub-screen using the direction key, the controller 30 detects it in step 56 and proceeds to step 58 to read and display the magnetic image data according to the movement command. Of course, accordingly, the location information and time information of the own image is updated in the own image location information display window. Therefore, the user can sequentially monitor the self image data immediately before or after the currently displayed sub image data according to the direction key operation, and also monitor the sub image data corresponding to the first stored I picture according to the direction key operation. will be. For reference, the child image displayed on the sub screen is a still image, and the image displayed on the main screen is video information of the current viewing channel.

When the child image desired by the user is displayed during the movement of the child image as described above, the user issues a playback command to play the parent image therefrom. Then, the controller 30 recognizes in step 60 that the playback command starting from the own image displayed on the sub-screen is received, and proceeds to step 62. In step 62, the controller 30 searches the position of the child image displayed on the sub-screen from the parent image data recorded so far, and reproduces the mother image data from the searched child image position. For reference, a method of finding the position of the child image displayed on the sub-screen from the parent image data recorded so far may be used by first generating a location information file of each child image data in the mother image data. That is, when generating a file of the self image screen, a location information file of the self image data corresponding to 1: 1 with the self image screen is generated. The location information file of the self image data indicates the position of the self image data in the parent image data. Indicates. The location information file of the own video data is combined with the file of the own video screen and can be managed as one file. In addition, it is possible to find the position of the child image in the mother image by time. That is, by multiplying the total size of the recorded mother screen by the time information of the selected child image and dividing it by the total playback time, the position of the mother screen within the mother screen can be found. Using any of these methods, the parent image data is reproduced from the searched child image position and the reproduction data is transmitted to the TV receiver through the demultiplexer 14, the MPEG A / V decoder 18, and the post-processing unit. By being provided, the user can play back the mother image data from the position of the user's high speed search through the child image, which is the still image, and view the main image.

In the above, the embodiment of the present invention has been described using the time-delayed view as an example. However, the present invention can be reproduced from the search position after the fast search through the self image even during the playback of the recorded stream without any modification.

That is, the controller 30 receives the broadcast stream of the recording channel and stores the recorded image data on the HDD 16 as the mother image data, periodically extracts the own image data from the currently displayed mother image data, and then reduces the HDD 16 to extract the own image data. ). Accordingly, the user can play and view the recording stream stored in the HDD 16. In response to receiving the self image display command as described with reference to FIG. 2 during the reproduction of the parent image data (displayed on the main screen), the controller 30 ) Reads out the last stored child image data and displays it on the sub-screen, and reads and displays the corresponding child image data as shown in FIG. 2 in response to a movement command. When receiving a playback command having the displayed magnetic image as a starting point while displaying the magnetic image data, the controller 30 searches for the position of the displayed magnetic image in the recorded mother image data, and reproduces the mother image data from the detected magnetic image position. By zooming, the user can play back the mother image data from the position of the user's high speed search through the child image, which is the still image, and view the main image. In this process, the self image location information display window as shown in FIG. 4 is naturally displayed.

As described above, since the present invention performs searching using self-image data extracted from the stream being recorded, the user can conveniently and accurately search for a desired playback position at high speed.

In addition, in the present invention, since the position information of the own video screen used for high-speed search is displayed together with the total amount of recorded video data, not only is it possible to recognize the remaining section of the search, but also when searching through the displayed position of the video image There is also an advantage that can provide ease of use. In addition, the user can easily recognize the amount of broadcasting missed through the time value between the position of the self image data and the parent image data being displayed.

On the other hand, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

Claims (10)

In the broadcast signal reception recording apparatus having a recording medium for viewing time delay, Storing a broadcast stream of a viewing channel as parent image data on the recording medium upon receiving a time delayed viewing command; Periodically extracting self image data from the stored mother image data; Reducing the extracted magnetic image data and storing the extracted magnetic image data on the recording medium; Reading and displaying the stored magnetic image data in response to the own image display command; Retrieving the position of the displayed magnetic image from the mother image data when a playback command having the displayed magnetic image as a starting point is received; And displaying and reproducing the parent image data from the searched child image position. The method of claim 1, further comprising: displaying an amount of parent image data stored up to the present time upon receiving a self image display command. The method of claim 2, further comprising displaying the amount of the parent image data in a bar graph, and displaying the position information of the displayed magnetic image data in the displayed bar graph. The method according to any one of claims 1 to 3, further comprising displaying time difference information between the own image displayed in response to receiving the own image display command and the currently displayed parent image data. Seek play method. The fast searching and reproducing method according to any one of claims 1 to 3, wherein the self-image data is I picture information. The fast searching according to any one of claims 1 to 3, wherein the parent image data is displayed on a main screen and the child image is displayed on a sub screen overlaid on a part of the main screen when the main image display command is received. How to play. The method of claim 3, further comprising: marking and displaying the location information of the child image in the bar graph when receiving the displayed position information storage command of the child image. A fast searching and reproducing method of an apparatus for recording a received broadcast signal on a magnetic recording medium, Receiving a broadcast stream of a recording channel and storing the same as the parent image data on the recording medium; Periodically extracting self image data from the parent image data being displayed; Reducing the extracted magnetic image data and storing the extracted magnetic image data on the recording medium; Reading and displaying previously stored magnetic image data in response to a magnetic image display command during reproduction of the recorded mother image data; Retrieving the position of the displayed magnetic image from the mother image data when a playback command having the displayed magnetic image as a starting point is received; And displaying and reproducing the parent image data from the searched child image position. The method of claim 8, wherein the first stored magnetic image data is read and displayed upon receiving the first magnetic image display command, and the magnetic image data immediately before or immediately after the direction key is input to zoom. The method of claim 8, further comprising: displaying a bar graph on the amount of the parent image data stored up to the present time upon receiving the self image display command, and displaying the location information of the displayed self image data in the displayed bar graph. Fast search playback method characterized in that.