KR100207782B1 - Video data recording and recording method for a digital video cassette recorder - Google Patents

Abstract

The present invention relates to a video data recording method and a reproduction method of a DVCR. When recording video data to VCR data, an index is recorded together with an intra picture for trick play in the first area of the tape, and the normal play is performed after this area. The data is recorded in sequence together with the index of the intra picture, and during playback, the data for trick play is stored in a memory, and then normal play is performed. When the search mode is performed by trick play during normal play, the memory is searched. The desired intra picture is found, and then played back from the index position on the tape indicated by the index of the found intra picture, so that the area of the tape for recording the trick play data is small, and even during playback, the recorded area is recorded in the first area of the tape. The data for trick play is recorded in memory Because performs a fast search of the trick play it is to realize a wide range of speeds.

Description

Image data recording method and playback method of digital video cassette recorder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video data recording method of a digital video cassette recorder (hereinafter referred to as DVCR), and more particularly, to a video data recording method and playback of DVCR, which facilitates trick play using a memory. It is about a method.

Currently standardized Inch high-definition DVCR and DVHS VCR have a recording method of digital, and the compressed digital video signal is recorded on a VCR tape.

However, since the VCR tape has a sequential access method, there is no problem in normal play, but it is difficult to perform a trick play to find a desired screen while driving the tape at high speed.

In particular, in the conventional DVCR, when the video data is repeatedly recorded on the tape several times, the data for trick play is also repeatedly recorded. Therefore, since the area for recording the trick play data is required, the data for trick play is recorded. There has been a problem that waste of tape recording space is generated.

The present invention solves the above-mentioned problems and reduces the area of the tape on which the trick play data is stored, as well as the video data recording method of DVCR, which makes it possible to retrieve the trick play data at various speeds. And a reproduction method thereof.

Fig. 1 shows the format of a video cassette recorder tape on which video data is recorded by the video data recording method of the digital video cassette recorder according to the present invention.

A video data recording method of a DVCR according to the present invention for achieving the above object is a DVCR that separates the video data into trick play data and normal play data, respectively, and record the data on a VCR tape. In the video data recording method of

In addition to storing the trick play data in a memory, the normal play data is recorded on a VCR tape, and when the recording of the normal play data is completed, the VCR tape is rewound to an initial position, and then the trick is stored in the memory. The play data is recorded from the initial position of the VCR tape.

In the DVCR video data reproduction method according to the present invention, an index of an intra picture for trick play is recorded together in the first area of the tape, and data for normal play is sequentially recorded with the index of the intra picture after this area. In a video data reproducing method in a DVCR that plays back video data of a VCR tape, when the play mode is entered, the trick play data is stored in a memory, and then normal play is performed. The memory is searched to find the desired intra picture, and then played back from the index position on the tape indicated by the index of the found intra picture.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

Fig. 1 shows the format of a VCR tape by the video data recording method of a digital video cassette recorder according to the present invention, in which data for trick play to be downloaded to memory is recorded in the first area of the VCR tape. After this area, normal play data is recorded in the input order.

As described above, the method for recording the trick play data and the normal play data on the VCR tape includes storing the trick play data in the memory, recording the normal play data on the VCR tape, and recording the normal play data. After completion, the VCR tape is rewound to the initial position, and then the data for trick play stored in the memory is recorded in the initial position of the VCR tape.

In this case, all of the trick play data is composed of only intra pictures and stored in a memory, and an index for each intra picture is stored together, and an index of an intra picture stored in the memory even when the normal play data is recorded on a tape. The same index as is recorded for each intra picture of the normal play data.

As described above, when storing the intra picture in the memory, it is preferable to reconstruct and store the intra picture only with a low frequency signal, and to store all the intra pictures in the memory, but when the capacity of the memory is not sufficient, all the intra pictures You can also save intermittently without saving all of them.

Further, the index stored together with the intra picture of the normal play data is recorded in the subcode area of the tape or every track from the track in which the intra picture is recorded to before the track in which the next intra picture is recorded. .

On the other hand, the method for reproducing the video data recorded on the tape as described above, the trick play data recorded in the first area of the tape is stored in the memory, and when the search mode by the trick play during normal play The memory is searched to find the desired intra picture, and then the tape is wound to a position indicated by the index of the intra picture and played from that position.

The operation and effects of the video data recording method and reproduction method of the DVCR according to the present invention as described above will be described in detail.

When a recording command is input, the data for trick play is recorded in the memory, and the data for normal play is also recorded on the tape.

Then, after the normal play data is completely recorded on the tape, the tape is automatically rewound to record the trick play data stored in the memory at the tape initial position on the tape.

In this case, when the recording is interrupted several times during recording, the data for trick play is stored again after offsetting by the amount of memory consumption.

That is, the trick play data is recorded again from the area following the previous trick play data stored in the memory.

All of the trick play data stored in the memory as described above is composed of only intra pictures, and when storing the intra pictures in the memory, the index is stored together, and the normal play data is stored in the memory even when the tape is written to the tape. The same index as that of the intra picture to be stored is recorded for each intra picture of the normal play data.

In this case, when storing an intra picture in the memory as described above, the intra picture is reconstructed and stored only as a low frequency signal.

In addition, it is preferable to store all input intra pictures stored in the memory. However, when the capacity of the memory is not sufficient, all the intra pictures may be intermittently stored without storing all the intra pictures.

For example, if the input intra pictures are input in the order of 1, 2, 3, they may be intermittently stored as 1, 3, 5, without storing them all in memory.

In addition, an index recorded for each intra picture of the normal play data may be recorded in a subcode area, and may be recorded for every track from the track in which the intra picture corresponding to the index is recorded to before the track in which the next intra picture is recorded. do.

As described above, when the same index is recorded for every track until a new intra picture is released, the start and end portions of the image indicated by the specific intra picture can be easily found.

On the other hand, when a command to play back video data recorded on a VCR tape is input as described above, the trick play data recorded in the first portion of the tape is first stored in a memory, and then normal play is performed using normal play data. .

When the fast search mode by trick play is executed during the normal play operation as described above, the memory is searched in the forward or backward direction to find the desired intra picture, and then the tape is wound to the position indicated by the index of the intra picture. Play again

In addition, the speed of retrieving the intra picture of the memory can be varied, and since there is an approximate proportional relationship between the intra picture position of the memory and the corresponding picture on the region where the normal play data is recorded, The vehicle can travel at a high speed in accordance with the search speed.

As described above, according to the present invention, the area of the tape for recording the trick play data is small according to the recording in the initial position of the tape, and the trick play data recorded in the first area of the tape even during playback. It is possible to realize various speeds by recording the data into a memory and performing a fast search by trick play.

Claims (9)

In the DVCR video data recording method of dividing video data into trick-play data and normal-play data, respectively, and recording them on a VCR tape, In addition to storing the trick play data in a memory, the normal play data is recorded on a VCR tape, and when the recording of the normal play data is completed, the VCR tape is rewound to an initial position, and then the trick play stored in the memory is performed. A video data recording method of a DVCR, wherein the recording data is recorded from the initial position of the VCR tape. 2. The video data recording method according to claim 1, wherein the trick play data stored in the memory is composed of only intra pictures. The method of claim 2, wherein the index is stored together with the index when the intra picture is stored in the memory. The DVCR image data recording method according to claim 3, wherein an index is also recorded for each intra picture of the normal play data when the normal play data is recorded on the tape. 5. The video data recording method according to claim 4, wherein the index is recorded in a subcode area. 5. The method according to claim 4, wherein the index is recorded for every track from the track on which the corresponding intra picture is recorded to before the track on which the next intra picture is recorded. The method of claim 2, wherein an intra picture is intermittently stored in the memory. 3. The method of claim 2, wherein the intra picture is reconstructed and stored in the memory using only low frequency signals. An image in a DVCR that plays back video data of a VCR tape in which an intra picture for trick play is recorded together with an index in the first area of the tape, and the normal play data is sequentially recorded together with the index of the intra picture from this area. In the data reproduction method, When the play mode is entered, the trick play data is stored in a memory and normal play is performed. When the play mode is performed by a trick play during normal play, the memory is searched to find a desired intra picture, and the index of the found intra picture is indicated. A reproduction method of video data of a DVCR, which is performed from an index position on a tape.