KR20040090197A - Method for backward reproducing in optical disc device - Google Patents

Abstract

PURPOSE: A reverse reproducing method in an optical disk device is provided to minimize the frequency of a jump operation for searching a recording position during a reverse reproduction or a reverse reproduction slow process, and to continuously read/reproduce buffered data while performing a jump operation. CONSTITUTION: A controller sets a reverse reproduction operational mode(S10), and temporarily stores sequentially read data A, B, and C in a buffer of a front end(S11). If the reading is terminated(S12), the controller reproduces/outputs the stored data C from a decoder and processor of a back end(S13). If the data C is requested to be read, the controller reproduces/outputs the data C from the decoder and processor of the back end(S14). The controller previously reads/buffers data F, E, and D(S16). If the data D is requested to be read(S17), the controller reproduces/outputs the data D from the decoder and processor of the back end(S18). Until a reverse reproduction operation is requested to be completed(S19), a series of jumping/buffering operations are repeated(S20).

Description

Inverse playback method on optical disc device {Method for backward reproducing in optical disc device}

The present invention relates to a reverse playback method in an optical disk device for outputting a smoother reverse playback image when performing backward play or reverse play slow operation in an optical disk device such as a DVD player. It is about.

Recently, various optical disc devices such as DVD players and the like capable of playing back high-definition video data and high-quality audio data for a long time have been developed and commercialized. As shown in FIG. 1, for example, as shown in FIG. Front-end consisting of an optical disc 10, an optical pickup 11, a preamplifier 12, a controller 13, a DRAM 14, a motor unit 15, and a servo driver 15, and a decoder. And a back-end including the processor 20, the SRAM 21, and the flash memory 22.

Meanwhile, a data reproduction operation is performed according to a user's request through an interface between the controller 13 of the optical disk device and the decoder and the processor 20. If the user requests a reverse reproduction operation, The controller 13 controls the servo driver 16 to operate, jumps the optical pickup 11 in the inner circumferential direction of the optical disc 10, and then writes to the recording position. After reading and buffering the data, the data is transmitted to the decoder and the processor 20 to perform a reproduction operation.

That is, as shown in FIG. 2, data searched and read by each jump operation performed according to the operation control of the controller is sequentially stored temporarily in the buffer of the front end such as the DRAM 14. C, D, F, G, I), and the back end buffer such as the SRAM 21 temporarily stores data read from the front end buffer (A, C, D, F, G, I). And then outputted as a reproduced image by decoding and reproduction signal processing operations of the decoder and processor.

Therefore, when the user requests the reverse playback operation or the reverse playback slow operation, the jump operation is sequentially performed in the inner circumferential direction of the optical disc (Jump 1 to 6), thereby reproducing and outputting data searched and read by the jump operation. In addition, the reverse playback image can be displayed on the screen of an external connection device such as a television.

However, when the jump operation is sequentially repeated as described above, the servo control is frequently delayed by the rotational inertia force of the spindle motor for rotating the optical disk and the inertia force of the optical pickup moved from the inner circumferential direction to the outer circumferential direction. During the operation, since the number of times data reproduction is temporarily stopped increases, a problem arises in that a smooth reverse playback image cannot be output.

Accordingly, the present invention has been made to solve the above problems, and in an optical disc device such as a DVD player, when the reverse play or reverse play slow operation is performed, the jump operation is minimized and the data play operation is paused. It is an object of the present invention to provide a reverse playback method in an optical disk device that minimizes the output and enables a smoother reverse playback image to be output.

1 shows a configuration of a general optical disk device,

2 shows an embodiment of a reverse playback method in a general optical disc apparatus.

3 shows an embodiment of a reverse playback method in an optical disk apparatus according to the present invention,

4 is a flowchart showing the operation of the reverse playback method in the optical disk apparatus according to the present invention.

※ Explanation of code for main part of drawing

10: optical disc 11: optical pickup

12: preamp 13: controller

14 DRAM 15 motor portion

16: servo driver 20: decoder and processor

21: SRAM 22: flash memory

In order to achieve the above object, the reverse reproducing method of the optical disc apparatus according to the present invention comprises: a step of searching for a recording position before a predetermined period before the recording position of the read-out data when performing the reverse reproducing operation; Reading and buffering data from the searched recording position to a recording position of the read requested data; Three steps of sequentially reproducing the read requested data among the buffered data; A fourth step of reading and reproducing the buffered corresponding data when the new data read request is requested during the reproduction, and searching for a recording position before a predetermined period from the searched recording position; And repeating a series of operations of reading and buffering data from the searched recording position to the recording position of the read requested data.

Best Mode for Carrying Out the Invention A preferred embodiment of a reverse playback method in an optical disk apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

First, the reverse playback method of the optical disk device according to the present invention can be applied to the reverse playback operation or the reverse playback slow operation in a DVD player or various other optical disk devices, and the front end as described above with reference to FIG. (Front End) and Back End (Back End) can be applied to the configured optical disk device.

On the other hand, in the present invention, as shown in Fig. 3, the recording position is searched for a predetermined section before the recording position of the data requested for reading out, and from the recording position to the recording position of the reading requested data. Data is read and buffered in advance.

For example, in the front-end controller 13, when A data is requested to be read, the controller 13 searches for a recording position of C data previously recorded, and stores C, B, and A data with the DRAM 14. It will buffer in the same front end buffer.

When the buffered A data is transferred to a buffer of a back end such as the SRAM 21, the decoder and processor 20 of the back end read and reproduce the C data, and then C data is read. The C data, which is already buffered in the buffer of the front end, is transmitted to the buffer of the back end, so that the decoder and the processor 20 of the back end read and reproduce the data.

In addition, the controller 13 searches for a previous recording position, for example, a recording position of the F data, and automatically performs a series of operations for pre-buffering the F, E, and D data into the front end buffer. As a result, the jump operations Jump 1,2 and 3 are minimized, and the buffered data is transmitted while the jump operation is performed, thereby preventing the reproduction operation from being disconnected. Same as

4 is a flowchart illustrating a reverse playback method of the optical disk apparatus according to the present invention. When the controller 13 sets the reverse playback mode according to a user's request (S10), In addition to receiving a read request for A-data from the decoder and processor 20, the servo drive unit 15 is also operated to control a recording position before a predetermined period, e.g., the recording position of the A-data recorded on the optical disc 10. For example, after searching the recording position where the C data is recorded, the C, B, and A data are sequentially read from the recording position, and a buffering operation of temporarily storing the C data in the front end buffer such as the DRAM 14 is performed. (S11).

On the other hand, when the above-described read operation is completed (S12), the controller 13 transfers the A data stored in the buffer of the front end to the buffer of the back end such as the SRAM 21, so that the back The decoder and the processor 20 at the end output the reproduction (S12).

Subsequently, when C data is requested to be read from the decoder and processor 20 of the back end, the controller 13 transmits the C data already buffered in the buffer of the front end to the buffer of the back end. The decoder and the processor 20 at the back end output the reproduction (S14).

At this time, the controller 13 transfers the C data and automatically searches for a previous recording position, for example, a recording position of the F data, and stores the F, E, and D data in the front end buffer. In step S16, a series of operations of reading and buffering are performed.

When the read operation as described above is completed (S16), in the controller 13, when D data is requested to be read from the decoder and the processor 20 of the back end (S17), the buffer of the front end is stored in the buffer of the front end. The stored D data is transferred to a buffer of the back end such as the SRAM 21, and reproduced and output by the decoder and the processor 20 of the back end (S18).

On the other hand, since the controller 13 repeatedly performs the above series of jump and buffering operations until the reverse regeneration operation is requested to be terminated (S19), the number of jumps for the reverse regeneration operation (Sump). 1,2,3) can be minimized, and except when performing the first jump operation, it is possible to prevent the playback video from being temporarily interrupted due to the jump operation, thereby providing a smoother reverse playback image. Output can be displayed.

Or more, preferred embodiments of the present invention described above, for the purpose of illustration, those skilled in the art, within the technical spirit and the technical scope of the present invention disclosed in the appended claims below, to further improve various other embodiments Changes, substitutions or additions will be possible.

In the reverse playback method of the optical disk apparatus according to the present invention, which is constructed and configured as described above, when the reverse playback or reverse playback slow operation is requested in an optical disk device such as a DVD player, recording is performed before a predetermined period before the recording position of the read requested data. After searching for the position, the data is read and buffered from the recording position to the recording position of the read requested data, and the new data read request is performed while sequentially reproducing from the read requested data among the buffered data. Reads and reproduces the buffered corresponding data, and repeats a series of operations of searching for a recording position before a predetermined interval from the searched recording position, thereby searching for a recording position during reverse playback or reverse playback slow operation. It is possible to minimize the number of jump operations to perform In the middle of performing, it is possible to play the buffered read data continuously is extremely useful inventions which can be output a smoother reverse playback picture.

Claims (3)

A step (1) of searching for a recording position before a predetermined interval before the recording position of the read-requested data when performing the reverse reproduction operation; Reading and buffering data from the searched recording position to a recording position of the read requested data; Three steps of sequentially reproducing the read requested data among the buffered data; A fourth step of reading and reproducing the buffered corresponding data when the new data read request is requested during the reproduction, and searching for a recording position before a predetermined period from the searched recording position; And And repeating a series of operations of reading and buffering data from the searched recording position to the recording position of the read requested data. The method of claim 1, And said predetermined section corresponds to a preset data recording track unit. The method of claim 1, And said step 4 is, when the last buffered data is read out and reproduced, at the same time, the recording position before the predetermined section is automatically searched.