JP2007110309A - Video recording and reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video recording and reproducing apparatus wherein a television video image is not greatly disturbed during reproduction by recoding a video image only a TV system designated by a user and reproducing the video image so as to eliminate the need for switching between an HDTV video image and an SDTV video image. <P>SOLUTION: The video recording and reproducing apparatus 10 includes: a TV system designation means 1 for designating either of TV systems, the HDTV and the SDTV; a TV system discrimination means 7 that discriminates whether or not a TV system of video data recorded on a recording and reproducing medium 5 is matched with the TV system designated by the TV system designation means 1 and outputs the video data of the designated TV system; a reproduction means 8 for reproducing the outputted video data; and a display means 9 for outputting and displaying the reproduced image. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a video recording / playback apparatus that captures and plays back video having different sampling frequencies.

  In recent years, with the rapid spread of high-definition TV (hereinafter referred to as HDTV) broadcasting, the HDV standard has been established as a standard for recording HDTV video in the video camera industry. It has been commercialized. In video cameras that can record HDTV video, not only HDTV video but also conventional SDTV video can be recorded in consideration of TVs that receive and display conventional standard TV (SDTV) broadcasts on the market. it can. However, in order to support both HDTV video and SDTV video, each sampling frequency is greatly different from about 74 MHz (74.18 MHz for NTSC, 74.25 MHz for PAL) and 13.5 MHz. As shown, generating means for generating different frequencies is required. When continuously playing back a recording / playback medium on which HDTV video and SDTV video are recorded, the sampling frequency of HDTV video and SDTV video is different, so HDTV video and SDTV video are switched in a commercialized device. There is a problem that the TV image is greatly disturbed in some places.

In order to avoid this problem, the device shown in Non-Patent Document 1 takes measures to stop video output at the time of switching between HDTV video and SDTV video.
Japanese Patent Laid-Open No. 7-226876 Sony HDR-HC1 Owner's Manual p.84

  However, with the above measures, the video output is stopped when the video output is stopped, although the process of stopping the video output at the time of switching between the HDTV video and the SDTV video can avoid a large disturbance of the TV video at the time of switching. Since the video is greatly disturbed at the moment of restarting, there is a problem that the occurrence of the video disturbance due to the change of the sampling frequency cannot be avoided.

  In view of the above problems, the present invention records and plays back only the TV system specified by the user, thereby eliminating the switching between HDTV video and SDTV video, so that the TV video is not greatly disturbed during playback. An object is to provide a video recording / reproducing apparatus.

  In order to solve the above problems, a video recording / reproducing apparatus of the present invention includes a TV system designating unit for designating a TV system and a system for generating a system clock having a sampling frequency corresponding to the designated TV system designated by the TV system designating unit. A clock generation unit; an imaging unit that captures an image of the designated TV system using the system clock; a recording unit that performs signal processing on the captured image and converts it into recording data to be recorded on a recording / reproducing medium; Data reading means for reading out the recorded data of the recording / reproducing medium as data, TV system determining means for determining whether the data is the specified TV system, and determination by the TV system determining means is the specified TV system Reproducing means for reproducing the matched data using the system clock, and display means for outputting and displaying an image reproduced by the reproducing means.

  As a result, only the TV video specified by the user is recorded and played back, so there is no switching between HDTV video and SDTV video during playback, and HDTV video even when the recording mode and playback mode are switched. By preventing the switching between the SDTV video and the SDTV video, the disturbance of the video due to the recording and playback of the HDTV video and the SDTV video can be avoided.

  Embodiments of a video recording / playback apparatus according to the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram of an embodiment of the video recording / reproducing apparatus of the present invention. The video recording / reproducing apparatus 10 includes a TV system designating unit 1 for designating a TV system of HDTV video or SDTV video by a user, a system clock generating unit 2 for generating a system clock corresponding to the TV system, and an imaging unit for capturing video. 3. Recording means 4 for recording captured video, recording / reproducing medium 5 for recording video, data reading means 6 for reading data recorded on the recording / reproducing medium, TV system for determining the TV system of the read video data The discriminating means 7, the reproducing means 8 for reproducing the recorded video, and the display means 9 for displaying the image to be reproduced are provided.

  The TV system designating unit 1 inputs TV system information of either HDTV video or SDTV video specified by the user to the system clock generating unit 2 and the TV system discriminating unit 7. The system clock generating unit 2 outputs a system clock having a sampling frequency corresponding to the input TV system information, and the output system clock is input to the imaging unit 3, the recording unit 4, and the reproducing unit 8. The imaging unit 3 captures an image corresponding to the TV system designated by the user based on the input system clock, and outputs the image. The output video signal is input to the recording unit 4, and the recording unit 4 performs signal processing based on the input system clock, and outputs video data converted into a format for recording the video signal. The TV system discriminating means 7 determines whether or not the TV system of the read video data matches the TV system information designated by the TV system designating means 1, outputs only the matched video data, and reproduces 8 To enter. The reproduction means 8 performs signal processing of the video data based on the input system clock, converts it into a video signal, and outputs it.

  Next, the operation at the time of recording in the video recording / reproducing apparatus of the present invention will be described. The user designates either an HDTV video or an SDTV video by an operation on the menu screen or the like except during recording and playback operations. The operation on the menu screen is an example of the TV system designation means 1 of the present invention, but is not limited thereto, and may be an operation with a switching button.

  The recording operation is started by the recording start operation by the user. The system clock generating means 2 outputs a system clock having a sampling frequency corresponding to the TV system designated in advance by the user (approximately 74 MHz when HDTV video is designated and 13.5 MHz when SDTV video is designated). The imaging unit 3 captures an HDTV video or an SDTV video with reference to the input system clock, and outputs the captured video signal to the recording unit 4. The recording means 4 performs signal processing on the video signal, converts it into video data, and records it on the recording / reproducing medium 5.

  An example of data in which HDTV video data 21 and SDTV video data 22 are alternately recorded using a tape medium as the recording / reproducing medium 5 is shown in FIG. On the tape medium, HDTV video data 21 and SDTV video data 22 and boundary information 23 are continuously recorded at the boundary. The boundary information 23 has TV system identification information for video data after the boundary. An example of the boundary information 23 is shown in FIG. The boundary information 23 stores information corresponding to MPEG2 sequence header information. Information of a video signal at the time of imaging is stored in the horizontal resolution 24 and the vertical resolution 25 in FIG. 3, and the TV system can be identified based on this information.

  FIG. 4 shows an example in which a randomly accessible medium such as an SD card is used as the recording / reproducing medium 5. On the medium, HDTV video data 21 or SDTV video data 22 is recorded separately for each recording operation. At this time, identification information 31 that identifies the TV system such as the video size is recorded in the video data. An example of the identification information 31 is shown in FIG. Information of the video signal at the time of imaging is stored in the horizontal resolution 24 and the vertical resolution 25 in FIG. 5, and the TV system can be identified based on this information.

  An operation during reproduction using the video recording / reproducing apparatus of the present invention will be described. A playback operation is started by a playback start operation by the user. When the recording / reproducing medium 5 is a tape medium, the data reading means 6 reads the recorded video data and the boundary information 23 in the order in which they are recorded. On the other hand, when the recording / reproducing medium 5 is a randomly accessible medium, the data reading means 6 The read video data and the identification information 31 are read in the order in which they are recorded, and the read data are output to the TV system discrimination means 7.

  The TV system discriminating means 7 discriminates the TV system of the video data using the boundary information 23 when the recording / reproducing medium 5 is a tape medium and using the identification information 31 when the recording / reproducing medium 5 is a randomly accessible medium. It is determined whether or not the TV system is specified in advance by the user. If the TV format is specified by the user, the video data is output, otherwise the next data is skipped. In the case of a randomly accessible medium, skip processing can be performed at high speed, so that the switching of video data becomes smoother than in the case of a tape medium.

  The determination of the TV system is performed using the horizontal resolution and vertical resolution values on the boundary information 23 and the identification information 31. As an example of the discrimination method, when the values of the horizontal resolution and the vertical resolution are 1920 and 1080, 1440 and 1080, or 1280 and 720, respectively, it is determined as an HDTV video, and otherwise, it is determined as an SDTV video.

  The system clock generating means 2 outputs a system clock having a sampling frequency corresponding to the TV system designated in advance by the user (approximately 74 MHz when HDTV video is specified, and 13.5 MHz when SDTV video is specified), and the reproducing means 8 is input. Signal processing is performed on the basis of the system clock thus converted to convert it into a video signal, and video is displayed on the display means 9.

  As a result, even if HDTV video and SDTV video are recorded on the recording / playback medium, only one of them is played back. Therefore, the sampling frequency does not switch during playback, and the video signal on the display means is disturbed. There is no.

  Furthermore, since the system clock is not switched when the recording operation is changed to the reproducing operation or vice versa, the same effect can be obtained.

  FIG. 6 shows an example of recording management information for collectively managing the TV system of video data. Management information 41 for collectively managing the TV system of the video data 42 to be recorded on the recording / reproducing medium 5 is recorded. The management information 41 has information for the number of recorded video data regarding the media object information, the horizontal resolution, and the vertical resolution. The data reading means 6 reads the horizontal and vertical resolutions of the corresponding video data on the management information 41 recorded on the recording / reproducing medium 5, and the TV format discrimination means 7 specifies the user via the data reading means 6. The same effect can be obtained by reading out and outputting the TV system video data 42.

  As described above, according to the present embodiment, in a digital video camera capable of recording a TV system video having different sampling frequencies such as HDTV video and SDTV video, during playback and switching from a recording operation to a playback operation, or During the reverse operation, the video output to the TV is not disturbed.

  As described above, according to the present invention, by providing the TV system discriminating unit that selects only the video designated by the TV system designating unit, during playback and switching from the recording operation to the playback operation, or vice versa. For video camcorders that can record and play back multiple TV video images with different sampling frequencies, such as HDTV video and SDTV video, which can provide a video recording / playback device that does not disturb the video output to the TV during operation. If applied, its practical effect is great.

The block diagram of one Embodiment in the video recording / reproducing apparatus of this invention 1 is a conceptual diagram showing recording data according to an embodiment of the present invention. The conceptual diagram which shows the boundary information of one Embodiment in this invention The conceptual diagram which shows the recording data of other embodiment in this invention The conceptual diagram which shows the identification information of other embodiment in this invention The conceptual diagram which shows the management information of other embodiment in this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 TV system designation | designated means 2 System clock generation means 3 Imaging means 4 Recording means 5 Recording / reproducing medium 6 Data reading means 7 TV system discrimination means 8 Playback means 9 Display means 10 Video recording / reproducing apparatus 21 HDTV video data 22 SDTV video data 23 Boundary Information 24 Horizontal resolution 25 Vertical resolution 31 Identification information 41 Management information 42 Video data

Claims (1)

TV system designation means for designating the TV system;
A system clock generating means for generating a system clock having a sampling frequency corresponding to the designated TV system designated by the TV system designating means;
An imaging means for taking an image of the designated TV system using the system clock;
Recording means for performing signal processing on the captured image and converting it into recording data to be recorded on a recording / reproducing medium;
Data reading means for reading the recording data of the recording / reproducing medium as data;
TV system determination means for determining whether the data is the designated TV system,
Reproduction means for reproducing data that matches the specified TV system by the determination of the TV system determination means using the system clock;
A video recording / reproducing apparatus comprising: display means for outputting and displaying an image reproduced by the reproducing means.