KR100654020B1 - Method and apparatus for recording video signal broadcasted as changing recording quality - Google Patents

Abstract

The present invention relates to a method and apparatus for appropriately changing a recording image quality in order to reduce an amount of recording media used for recording a video signal broadcasted at a scheduled recording time, When a plurality of programs are included in the recording set time, the video signal is recorded by setting the recording mode differently according to the included time length.

Recording, broadcast time, program, mode, picture quality, change, disc

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and apparatus for automatically recording a video signal,             

1 is a diagram illustrating a relationship between a scheduled recording interval set by a user and a program broadcast time,

2 is a configuration of an embodiment of a recording / reproducing apparatus for an optical recording medium to which a method of recording a video signal while changing a recording quality is applied according to the present invention,

FIG. 3 is a flowchart of a method of recording a video signal while changing a recording quality according to the present invention,

FIG. 4 illustrates a broadcast program time table acquired and stored from a broadcast signal,

5A and 5B are diagrams showing the relationship between the reserved recording interval and the program broadcasting time and the example in which the recording mode is determined differently for each interval,

6 is a configuration of another embodiment of a recording / reproducing apparatus for an optical recording medium to which a method of recording a video signal while changing a recording image quality according to the present invention is applied.

Description of the Related Art

2: optical pickup 10: tuner

11: Digital demodulation section 12: Re-encoder

13: recording DSP unit 14: optical driver

20: RF section 21: playback DSP section

22: D / A converter 23: A / V decoder

24: Synthesizer 30, 30 ': Microcomputer

31: servo control unit 32: memory

33: OSD section 34: clock section

61: synchronous signal demodulator 62: PES encoder

63: PES decoder

The present invention relates to a method and an apparatus for appropriately changing a recording image quality to record an image signal broadcasted at a scheduled recording time in order to reduce an amount of recording media used.

As broadcast channels become diverse, users frequently watch programs they want to watch and then watch them at their own convenience.

[0004] However, at the time of scheduled recording of the user's program, a time zone in which a program to be watched later is expected to be broadcasted is specified, and it is common that the program to be broadcast is not broadcast at a precisely expected time zone. In addition, it is common that the user is set longer than the broadcast time zone of the desired program so that a part before and / or after the program is disconnected.

Therefore, if the user actually sets the reserved recording time more than the broadcasting program time and the actual broadcasting time zone of the broadcasting program also deviates, the section 101 recorded by the actual reserved recording as illustrated in FIG. It includes a significant amount of other programs before and / or after the program 102 of the specific channel desired to be recorded.

On the other hand, a video recording apparatus for recording a video signal on a disk medium such as a DVD +/- R is required to record a video signal on a DVD +/- R having a limited recording capacity, for example, a capacity of 4.7 GB for a longer time Various recording modes are provided. For example, in the HQ mode, a 9.8Mbps recording bit rate is required for video signal recording. In this mode, a video signal of about one hour is recorded in a recording capacity of 4.7GB. Therefore, And provides a mode with a low data bit rate. These modes are SP, LP, EP and SLP, and their data bit rates are 9.8 / 2Mbps, 9.8 / 3Mbps, 9.8 / 4Mbps, and 9.8 / 6Mbps respectively and the recording time is approximately 2, 3, 4 , And 6 hours.

However, even if a recording medium is provided for increasing the recording time for a disk medium having such a limited recording capacity, the user tends to select the HQ mode or the SP mode because he or she wants to view a high-quality image if possible. In such a case, when a program is scheduled to be recorded in the same manner as described above, a video signal other than a program to be viewed by the user is considerably included, unnecessarily using the capacity of the disk, It may not be possible to record the data.

Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an apparatus and a method for recording a program recorded on a recording medium, A method and an apparatus for recording an image with a picture quality lower than a designated picture quality so as to reduce a recording amount.

According to an aspect of the present invention, there is provided a video recording method for recording video signals received from a channel requested to be recorded in a recording set time, if a plurality of programs are included in a recording set time, And the mode is set differently.

In one embodiment of the present invention, a recording mode set by the user is set for a program including the longest time in the recording set time, and a lower quality is provided for the remaining programs than an image quality set by the user Set to the recording mode.

In addition, in an embodiment according to the present invention, when a user designates a recording mode of the highest picture quality, for a time period except for one program in which the longest time is included in the set recording time, data Recording is performed in a recording mode with a data bit rate that is 1/3 of the bit rate.

In another exemplary embodiment of the present invention, recording is performed in a recording mode that specifies the lowest image quality for a period of time except for a program including the longest time within the set recording time.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a method and apparatus for recording a video signal while changing a recording quality according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram illustrating a configuration of an embodiment of a recording / reproducing apparatus for an optical recording medium according to the present invention, in which a method of recording video signals while changing a recording quality is an apparatus for recording and reproducing digital broadcasting signals.

2 includes a tuner 10 for tuning a television broadcast signal, a transport stream (for example, a transport stream A re-encoder 12 for decoding the transport packet sequence and restoring the video signal and re-encoding the video signal into a PES packet; A recording DSP unit 13 for modulating the PES packet sequence into an ECC (Error Correction Code) format and then modulating the PES packet sequence into a signal for recording, a light driving unit 14 for applying a recording beam driving current to the optical pickup 2 ), An optical pickup (2) for reading a signal of the optical recording medium (1) such as a DVD +/- R or recording a signal from the optical driver (14), a binarized reproduction signal An RF unit 20 for outputting an electrical signal for focusing error (FE) signal and tracking error (TE), a reproduction DSP unit 21 for recovering the binarized reproduction signal into digital data, (22) for demultiplexing the encoded audio / video data and outputting the encoded audio / video data and separately extracting management information and navigation information from the restored digital data, An A / V decoder 23 for outputting an audio video signal, an OSD unit 33 for generating a character and graphics signal, a synthesizer 24 for synthesizing and outputting the video signal and the character and graphics signals, A servo control unit 31 for controlling the optical pickup 2 and an incident beam (for recording and reproduction) according to a tracking error signal and driving a spindle motor M for rotating the optical recording medium 1, A clock unit 34 that tracks the current date and time, and a microcomputer 30 that processes user input and controls the recording / reproducing operation as a whole.

Hereinafter, the method of FIG. 3 for recording a video signal while changing the recording image quality will be described in detail in parallel with the operation of the recording / reproducing apparatus of FIG.

In the recording / reproducing apparatus of FIG. 2, when the broadcasting signal of the channel currently set in the tuner 10 is tuned in the state that the operating power is applied, the digital demodulator 11 demodulates the transport stream from the tuned signal, (Hereinafter, referred to as TP) having a specific packet ID, for example, a value of '00' in the demodulated transport stream, and transmits the data stored in the packet to the microcomputer 30 . This data may include information about programs to be broadcasted or scheduled to be broadcast on the current channel, such as the ID (PID) of packets containing the program, a program title, a broadcast time, )to be.

Accordingly, the microcomputer 30 collects the transmitted data, analyzes it according to a predetermined format, and constructs a broadcast program table for the currently tuned channel and stores the program table in the memory 32 (S10). If a channel is changed by a user request, a broadcast program table for the converted channel is also configured by performing the same operation for the channel. In this way, the memory 32 stores the broadcast program information as shown in FIG. The broadcast program information does not have to be acquired for all channels, and it is sufficient to acquire a broadcast program table for the channel at the time of tuning a specific channel for scheduled recording.

On the other hand, the user can select a channel, a recording mode (HQ, SP, LP, EP, SLP) of his / her own through input means such as a remote controller One), and an expected broadcast time zone of the program, and sets the reserved recording (S11). The contents of the reserved recording are temporarily stored in the memory 32. The reserved recording input can be conveniently performed through a GUI (Graphic User Interface) program embedded in the microcomputer 30, and a screen for inputting is input to the OSD unit 30, under the control of the microcomputer 30, And a character and graphic screen generated by the character recognition unit 33. [ Reception of the remote control signal is performed through a conventional infrared ray receiving means (not shown), which is interpreted by the microcomputer 30.

When the user sets a desired scheduled recording, the recording / reproducing apparatus is in a standby state until the time is reached. In the standby state, operating power is not provided other than the components necessary for the operation to confirm the time and the power on / off request of the user.

In step S12, the microcomputer 30 monitors whether the current date / time being followed by the clock unit 34 in the standby state is the start time or one to two minutes of the preset recording time zone. The controller 10 controls the tuner 10 to switch the reserved recording channel by switching the operating state by applying operating power to all the components. The reason for tuning the channel one or two minutes before the start of the scheduled recording is to acquire the program broadcast information of the corresponding channel in advance before starting the recording as described above.

Then, the microcomputer 30 determines the recording mode in detail (S13). For this, the microcomputer 30 searches the program time table of the recorded channel in the program time table of each channel acquired and stored in the memory 32, and includes at least a part of the recording start time and the end time . For a program having the longest broadcast time within the recording start time and the end time among the searched programs, the user keeps the recording mode set at the time of scheduled recording, Setting.

5A, it is assumed that the time interval 500 by the reserved recording is 8:40 pm to 9:45 minutes, and at least a part of the three programs (programs A, B, and C) , The inclusion time of program A is 10 minutes from 8:40 to 8:50, the inclusion time of program B is 48 minutes from 8:50 to 9:38, and the inclusion time of program C is 9 : It takes 7 minutes from 38 minutes to 9:45 minutes. Therefore, since the program including the longest time in the recorded time is B, the mode set by the user, for example, HQ mode (for example, HQ mode And set LP or lower recording mode for each section before and after it (8:40 to 8:50 pm and 9:38 to 9:45 pm). If the mode set by the user at the time of the scheduled recording is the LP mode, the EP or the SLP mode of the lower picture quality is discriminated and set for the preceding and following time periods. As shown in FIG. 5A, when the reserved recording interval is recorded by differently recording the recording mode, the size of approximately 833 MBytes (the 34-minute recording amount of the LP mode) is less used in recording than when the whole interval is recorded by HQ.

When the recording mode is set for each of the time periods for which the reserved recording is requested, the microcomputer 30 controls the servo control unit 31 so that the mounted disk 1 is in a mode for the first section, (Step S14). In step S14, a mode for encoding the video signal is set to LP in the re-encoder 12, and the mode for encoding the video signal is set to LP in the re-encoder 12 so that the recording speed is higher than or equal to the LP mode (9.8 / 3 Mbps recording bit rate). Further, the servo control unit 31 is controlled to move the optical pickup 2 to an area for recording on the disk 1. [

If the programmed duration and the broadcast time of the program have the exemplary relationship shown in FIG. 5B, the program A at the head of the program has a time longer than 20 minutes, which is 45 minutes. To 9:25 are designated as HQ, and 9:25 to 9:45 as LP mode or lower, respectively. Therefore, at this time, when the mounted disc 1 is rotated for recording, the disc is rotated so that it immediately becomes the recording speed corresponding to the mode designated by the user, for example, the HQ mode, and the HQ mode is applied to the re- Setting.

In the case where the advertisement time is included in the program information as a separate program interval, the time interval between the broadcast programs is a short interval of at least about 5 minutes, and thus the interval can not be the longest time interval within the reserved recording interval. As shown in FIG.

On the other hand, a signal received from the tuned channel is demodulated into transport packets by the digital demodulator 11. These packets are input to the re-encoder 12 from the start time of the scheduled recording, After that, it is re-encoded according to the currently set recording mode. For example, in the HQ mode, the encoded data is encoded to have the highest (e.g., 600x480) resolution and the highest pixel depth (i.e., the number of bits per pixel) with a bit rate of 9.8 Mbps, LP, EP, and SLP modes, the resolution and the pixel depth are lowered in accordance with the bit rate set in the mode. The output data of the re-encoder 12 is modulated into a recording signal after it is configured in the ECC format for error correction by the recording DSP unit 13 and is output through the optical drive unit 14 and the optical pickup 2, And starts to be recorded along the track on the disc 1 rotating at a speed corresponding to the recording mode or faster than that (S15).

After the start of the recording, the microcomputer 30 continuously checks whether the current time is the boundary time of the divided section that has been divided (S16), and if it is the boundary time, And changes to the set recording mode (S17). That is, the encoding mode of the re-encoder 12 is reset and the recording speed on the disc 1 is also changed. In the example of FIG. 5A, the HQ mode is changed from HQ to LP mode at 8:50 minutes in the LP to HQ mode, and in the example of FIG. 5B at 9:25. After the recording mode is changed, the video signal received again is continuously recorded. This recording operation is performed until the end time of the set reserved recording time zone (S18).

When the time confirmed from the clock unit 34 is the recording end time (S18), the microcomputer 30 terminates the current recording operation, and records the information on the recorded time, channel, and recording position in one recording entry and records the entry in the management information area of the disk 1 (S19). The information on the recording position may be a number capable of indexing cell information having positional information on the recorded section, a file name allocated to the recorded section or a physical start of the recorded section, End address, and may be various known information indicating the position of the segment on the disk.

When such recording is performed one or more times, a recording list is generated, and the recording list is read from the disk 1 when the user requests confirmation of a recorded program. A high frequency signal read by the optical pickup 2 from the disc 1 is converted into digital data by the RF unit 20 and the reproduction DSP unit 21. At this time, management information and navigation information Is transmitted to the microcomputer 30 and the A / V data stream is transmitted to the downstream decoder 22.

The microcomputer 30 temporarily stores the recording list information transmitted from the playback DSP unit 21 in the memory 32 and provides the generated list information to the OSD unit 33 in accordance with the output screen, It is possible to select one recording entry from the list output on the recording medium.

When one recording entry is selected from the displayed recording list, the microcomputer 30 refers to the recording section position information of the selected entry to control the servo control section 24 to move the optical pickup 2 to a corresponding position The read operation is performed. The data stream of the recording section to be read is transmitted to the de-interleaver 22 as described above. The de-interleaver 22 extracts the A / V data encoded in the different recording modes from the input data stream, V decoder 23 to be output as an A / V signal. As a result, the user can view the program that he / she wants to record with the image quality desired by himself / herself while viewing the other sections with low image quality, but this section is intentionally skipped at high speed.

In the embodiment of FIG. 3, if the broadcasting terminal determines the changing point of the recording mode based on the program broadcast time, but the broadcasting company provides different packet IDs (PIDs) for the respective programs, It can also be judged by the value. For example, after confirming the PID of the program including the longest time in the preset recording interval in the broadcast information table of FIG. 4, while the packet having the PID value is received, the recording mode set by the user, Encodes and records the video signal in the HQ mode and re-encodes the video signal in the SLP mode which is lower or the lowest recording mode than the recording mode set by the user while the packet of the PID is received, not the PID value.

The present invention described so far can be applied to an analog broadcast signal other than a digital broadcast signal. A method in which an analog broadcast signal transmits information about a broadcast program is a method in which, for example, when an NTSC system is used, a 2-byte information fragment is modulated in a horizontal synchronization signal at a specific fixed position in a vertical synchronization signal . Therefore, when the recording / reproducing apparatus is configured as shown in FIG. 6, the above-described method of FIG. 3 for the analog broadcasting signal is also applied to the case of the reserved recording as shown in FIGS. 5A and 5B, (The program with the longest time) is recorded in the high definition mode designated by the user, and the remaining sections are recorded in the low image quality mode.

6 includes a synchronous signal demodulator 61, a PES encoder 62, and a PES decoder 63, which are different from the apparatus shown in FIG. The synchronous signal demodulator 61 detects 2-byte data modulated by the above-mentioned specific synchronous signal and supplies the 2-byte data to the microcomputer 30 '. The PES encoder 62 converts the input video signal into a digital signal For example, an MPEG method, and converts the encoded data into PES (Packetized Elementary Stream) packets of audio and video data so as to have a resolution and a pixel depth according to the designated recording mode, and then muxing And applies it to the DSP unit 13. The PES decoder 63 at the playback end performs the inverse operation of the PES encoder 62. The PES decoder 63 separates audio and video PES packets from the incoming PES packet sequence and decodes the A / Output.

Meanwhile, the microcomputer 30 'collects the input 2-byte pieces of information and forms it into a predetermined format, thereby constituting program broadcast information as shown in FIG. 4 to determine the recording mode for the reserved recording time zone in detail .

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. Those who are knowledgeable can easily understand it. It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, it is intended to cover various modifications within the scope of the appended claims.

According to the present invention as described above, only a broadcast program desired to be recorded by a user is recorded in an image quality desired by a user in a time zone in which a scheduled recording is set, and a video signal contained in the broadcast program is recorded in a low- Make it possible to record more programs.

Claims (18)

Retrieving program information and confirming whether a plurality of programs are provided within the set recording time; And And determining that the program of the longest time is a high picture quality or a recording mode designated by the user at the time of recording setting and the remaining program is a low image quality recording mode when a plurality of programs are provided as a result of the checking, And determining a recording mode. The method according to claim 1, Wherein the recording mode determination step determines a recording mode of the longest time among a plurality of programs including at least some sections within a recording set time as a high quality or a recording mode designated by a user in a recording setting, Wherein the determining step determines the recording mode to be a recording mode. delete delete The method according to claim 1, And recording the video signal received within the preset recording time on the recording medium according to the set recording mode, Wherein the recording step comprises: Determining a resolution and a pixel depth according to the set recording mode, and encoding the determined resolution and pixel depth, And recording the video signal on the recording medium while rotating the recording medium to a recording speed at least not lower than the bit rate of the encoded data. delete delete delete delete delete delete An apparatus for recording a video signal, A receiver for tuning an arbitrary channel of a broadcast signal to detect a video signal and program information; An encoder for encoding the detected video signal according to a recording mode; A recording / reproducing unit for recording the encoded video signal on a recording medium and reading the recorded signal; A storage unit for storing the detected program information; And If a plurality of programs are provided as a result of checking, the program of the longest time may be recorded in a recording mode of a recording mode designated by the user at the time of recording setting, And determines a remaining program as a low quality recording mode. 13. The method of claim 12, Wherein the control unit controls the receiving unit to record the video signal of the channel requested by the user during the recording time set by the user and is encoded by the encoder in accordance with the set recording mode and then is recorded on the recording medium by the recording / To be recorded. 13. The method of claim 12, Wherein the control unit controls the drive unit that drives the recording medium to rotate so as to rotate the recording medium at a recording speed that is not lower than at least a bit rate of data output from the encoder. 13. The method of claim 12, The controller determines that the program of the longest time among a plurality of programs including at least some sections within the recording set time is a recording mode designated at the time of high picture quality or user setting and the remaining program is determined to be a low quality picture recording mode Lt; / RTI > delete 13. The method of claim 12, Wherein the encoder encodes the detected video signal with different resolution and pixel depth according to a set recording mode. delete

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