JPH0340682A - Recording and reproducing device for hdtv - Google Patents

Abstract

PURPOSE:To prevent pictures before and after a joint from being overlapped with each other by rewriting a moving picture/still picture identification signal of an HDTV signal by 3 fields into a signal in the moving mode depending on a joint when an HDTVSG is recorded or reproduced to or from a recording medium with the HDTVSG recorded thereon. CONSTITUTION:When a video signal (HDTVSG) processed differently from a moving picture/still picture to be recorded is a moving picture, a moving picture/still picture identification signal detector 2 outputs an L level and an AND circuit 6 outputs an L level as the result, A changeover switch 4 sends the HDTVSG to be recorded now to a recording circuit directly with an output of the AND circuit 5. Moreover, when the HDTVSG to be recorded is a still picture, the detector 2 outputs an H level and a time detector 3 detecting a prescribed period from the start of recording outputs an H level for a period by 3 fields from the start of recording. As a result, the overlap of video images before and after a joint is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a video signal processing system in which video signals are processed differently for moving images and still images on a recording medium on which video signals are processed differently for moving images and still images. HDTV that records and plays
This relates to a recording and reproducing device for use.

BACKGROUND OF THE INVENTION In recent years, there has been an increasing demand for higher image quality than conventional television broadcasting, and the development of HD TV has been progressing. Therefore, MIJSE method 2, which is an example of HD TV, will be briefly explained here. Second
The figure is a diagram of subsampling in a still image of MUSE.

The MUSE method performs different signal processing for moving images and still images, with intra-field interpolation for moving images and temporal interpolation between frames and fields for still images. . That is, since sub-Nyquist sampling is performed for a still image in one cycle in four fields as shown in FIG. 2, interpolation is also performed in the time axis direction.

Furthermore, here, a video signal that has been subjected to different processing for moving images and still images will be expressed as HDTVSG.

Problem to be Solved by the Invention However, when recording and reproducing HDTVSG on a recording medium on which HDTVSG is recorded, if the HDTVSG to be recorded is a moving image, intra-field interpolation must be performed for the moving image. However, if the HDTVSG to be recorded is a still image, temporal interpolation between frames and fields is performed for still images, so the HDTVSG will not be recorded. At the joint where HDTVSG is recorded and reproduced on a recording medium that is currently being used, the previously recorded image and the currently recorded image overlap and are output to the monitor, as shown in FIG.

Therefore, the present invention is intended to solve the above-mentioned conventional problems.
It is an object of the present invention to provide a method for outputting a previously recorded image and a currently recorded image to a monitor without overlapping them even at the joint when recording and reproducing SG.

! Means for Solving Problem i In order to achieve this object, the HD TV recording and reproducing apparatus of the present invention has the following features: When recording and reproducing DTVSG (on a recording medium on which HDTVSG is recorded), It has a configuration that rewrites the moving/still image identification signal of the HD TV signal for three fields into the moving mode.

Effect: These 11 commandments make it possible to prevent images before and after the seam from overlapping each other at the seam of the reproduced image when recording and reproducing HDTVSC on a recording medium in which HDTVS (1;) is recorded. .

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.9 In FIG. 1, 1 is a moving image/still image identification signal rewriting device, 2 is a moving image/still image identification signal detector, 3 is a time detector that detects a certain period from the start of recording;
4 is a changeover switch circuit, and 5 is an AND circuit.

The operation of the HDTV recording and reproducing apparatus configured as described above will be described below.

First, when recording HDTVSC on a recording medium on which HD 'FV S
The signal is then input to a moving image/still image identification signal detector 2 and a time detector 3 that detects a certain period of time from the start of recording. At this time, if the HDTVSG to be recorded now is a moving image, the moving/still @ identification signal detector 2 outputs L (+Color), and as a result, the AND circuit 5 outputs L. The output of the AND circuit 5 causes the changeover switch circuit 4 to select the HD to be recorded now.
Send TVSG directly to the recording circuit. Also, the H
If the DTVSG is a still image, the video/still image identification signal detector 2 outputs H (high), and the time detector 3, which detects a certain period from the start of recording, detects a period of 3 fields from the start of recording. Outputs H for a period of . That is, the AND circuit 5 outputs H for a period of three fields from the start of recording, and then outputs the following. As a result, according to the output of the AND circuit 5, the changeover switch circuit 4 rewrites the HDTVSG moving image/still image identification signal for three fields from the start of recording to the moving image mode using the moving image/still image identification signal rewriting device l, and the recording circuit For HDTVSG after three fields from the start of recording, the moving image/still image identification signal is sent directly to the recording circuit without being rewritten.

As described above, according to this embodiment, by providing a control circuit that rewrites the moving image/still image identification signal for three fields after the recording start point to the moving mode, two images before and after the joint point are provided.
It is possible to avoid overlapping.

Effects of the Invention As described above, the present invention provides a moving image/still image identification signal rewriting device, so that when HDTVSG is recorded and reproduced on a recording medium on which HDTVSG is recorded,
When reproducing images from the recording medium, the images before and after the seam point will not overlap twice at the seam point. Figure 1 is a simple Bronnok diagram of the present invention, and Figure 2 is a 1 ...Movie/still image identification signal rewriting device, 2...
...Video/still image identification signal detector, 3...
Time detector, 4... Changeover switch controller.

Claims (1)

[Claims] When recording and playing back video signals that have undergone different processing for moving images and still images on a recording medium that has recorded video signals that have undergone different processing for moving images and still images,
A video/still image that has a video/still image identification signal detector for video signals that have undergone different processing for still images, and that rewrites the video/still image identification signal for video signals that have undergone different processing for video/still images into video mode. It has an image identification signal rewriting device, a time detector that detects a certain period from the start of recording, and the output and recording of the video/still image identification signal detector of the video signal that has been processed differently depending on the video/still image. It has a changeover switch circuit that operates in response to the output of a time detector that detects a certain period from the start of recording, and applies different processing to the video/still image after the seam point for a certain period of time from the start of recording. An HDTV recording and reproducing device having a circuit that rewrites a moving image/still image identification signal of a video signal to a moving image mode.