KR100717852B1 - Playback Speed Change Method suitable for Playback Purpose of Multi-Purpose Media in Optical Disk Drive - Google Patents

Abstract

The present invention relates to a method of varying a playback speed suitable for the purpose of playing multi-purpose media in an optical disk drive, comprising the steps of: a) determining the type of optical recording medium currently inserted in the optical disk drive; b) searching for whether a servo action of the optical disc drive is taking place; c) calculating a frequency of occurrence of a command issued from the host to the optical disk drive, and determining based on this, the command generated from the host to the optical disk drive is a reproduction or extraction; And d) increasing the speed of the optical disk drive when it is determined in step c) that the command issued by the host to the optical disk drive is extraction.

ODD, playback speed, optical disc

Description

Playback Speed Change Method suitable for Playback Purpose of Multi-Purpose Media in Optical Disk Drive}             

1 is a timing diagram for a command generated by a host when extracting audio / video data according to an embodiment of the present invention.

2 is a trace diagram of a command actually generated by a host when extracting audio / video data according to an embodiment of the present invention.

3 is a timing diagram for a command generated by a host when playing audio / video data according to an embodiment of the present invention.

4 is a trace diagram of a command actually generated by a host when playing audio / video data according to an embodiment of the present invention.

5 is a flow chart according to an embodiment of the present invention, which shows a sequence when a reproduction command is changed to an extraction command.

6 is a graph illustrating a transition rate for each data processing speed in an audio / video disc according to an embodiment of the present invention.

The present invention relates to a method of varying the playback speed suitable for the purpose of playing multi-purpose media in an optical disk drive, wherein the same command generated by the host is analyzed in real time to distinguish whether the host wants to play or extract a disk in the optical disk drive. It relates to a method of adjusting the speed of the optical disk drive accordingly.

In the prior art, when playing a multimedia disc in an optical disc drive, a playback speed is adjusted in accordance with a command generated from a computer host. That is, when an audio disc generates a PLAY CD Command (0xBC) or PLAY Audio MSF Command (0x47) command, analog playback is performed. When a disc is copied or digitally played, READ is performed. The CD command (0xBE) or READ CD MSF Command (0xB9) command was issued to copy or digitally play the disc.

In the conventional optical disk drive, the playback speed control method for the multimedia disk (audio / video) is classified into the commands generated in the host as described above, and an appropriate playback speed is used.

However, in recent years, the optical disc drive uses a method of determining the state in which the disc is controlled by the servo part (normally playing or stopping) and determining whether the medium is being played or copied. The conventional technique decelerates the speed by focusing on the fact that buffering is continuously performed at the time of extraction in the servo portion inside the optical disc drive to detect whether the current state is being reproduced or extracted. I was. That is, the conventional method has a disadvantage in that the host cannot directly analyze a desired state by excluding the interface part directly executing the command of the computer host and controlling the speed in the servo part.

However, the playback and extraction of audio discs and video discs are basically handled by the same command from the computer side, so they need to be distinguished from the optical disc drive standpoint.

Traditionally, the playback method of the audio disc in the computer has used PLAY CD Command or PLAY CD MSF Command, and the playback speed inside the optical disc drive is 1x. However, the problem that can occur when playing an audio disc at 1 times is that it is weak to external vibration.

In order to solve this problem, the use of a buffer inside the optical disc drive enables high speed playback. However, the newly emerging problem while implementing high speed playback has a noise problem generated during high speed playback.

In recent years, the computer audio player has adopted a method of receiving data from an optical disk drive at once and processing data received inside the computer without using PLAY CD Command or PLAY CD MSF Command. The above method is implemented as READ CD Command or READ CD MSF Command, but the problem that can be caused by sharing these commands is whether the current host wants to play the audio disc or is copying. There is a problem that the optical disc drive does not know.

An object of the present invention has been made to solve the above problems, when playing an audio disc or a video disc in an optical disc drive, in order to reduce the noise generated while playing at high speed, the playback speed is lowered during playback In the case of copying a disc for the purpose of backing up an audio disc or a video disc, there is provided a method of varying the playback speed in an optical disc drive which speeds up the copy speed while operating the extraction speed at a high speed. have.

The present invention relates to a method of varying a playback speed suitable for the purpose of playing multi-purpose media in an optical disk drive, comprising the steps of: a) determining the type of optical recording medium currently inserted in the optical disk drive; b) searching for whether a servo action of the optical disc drive is taking place; c) calculating a frequency of occurrence of a command issued from the host to the optical disk drive, and determining based on this, the command generated from the host to the optical disk drive is a reproduction or extraction; And d) if it is determined in step c) that the command issued by the host to the optical disk drive is extraction, increasing the speed of the optical disk drive.

In the present invention, the method for determining the command generated by the host of the step c) to the optical disk drive includes: c1) whether the access position of the command generated at the current host is the access position and continuity of the command previously generated at the host. Searching; c2) calculating a time interval between a command generated at the current host and a command previously generated at the host; And c3) performing step d) if the time interval is repeated for a predetermined time.

In the present invention, step c2) preferably determines that the command generated by the host to the optical disk drive is extracted when the time interval between the command generated in the current host and the command previously generated in the host is within 130 ms.

In another optical disk drive of the present invention, a method of varying a playback speed suitable for the purpose of reproducing multi-purpose media includes: a) determining the type of optical recording medium currently inserted in the optical disk drive; B) searching for whether a servo action of the optical disc drive is taking place; C) calculating a frequency of occurrence of a command issued from the host to the optical disk drive, and determining based on this, the command generated from the host to the optical disk drive is a reproduction or extraction; And d) reducing the speed of the optical disc drive when it is determined in step c) that the command issued by the host to the optical disc drive is playback.

In the present invention, the method for determining a command generated by the host of the step c) to the optical disk drive includes: c) whether the access position of the command generated at the current host is the access position and continuity of the command previously generated at the host. Searching for; C) calculating a time interval between a command generated at the current host and a command previously generated at the host; And c) performing step d) if the time interval is repeated for a predetermined time.

In the present invention, in the step c2), when the time interval between the command generated at the current host and the command previously generated at the host is 100 ms or more, it is preferable to determine that the command generated by the optical disk drive at the host is a playback.

In the present invention, it is preferable to analyze the same command generated from the host in real time and analyze whether the host wants to play or copy the disc in the optical disk drive and operate at an appropriate playback speed. .

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In adding reference numerals to components of the following drawings, it is determined that the same components have the same reference numerals as much as possible even if displayed on different drawings, and it is determined that they may unnecessarily obscure the subject matter of the present invention. Detailed descriptions of well-known functions and configurations will be omitted.

1 is a time flow diagram of a command generated by a host when copying data from an audio or video disc according to an embodiment of the present invention, and FIG. 2 is an audio or video disc according to an embodiment of the present invention. This is a diagram illustrating the processing of a command actually generated by a host when data is copied from the network.

In the above embodiment, the command processing includes the steps of the host generating a command to the optical disk drive, the optical disk drive transmitting data on the command generated on the optical disk, and delaying until the next command occurs. Include.

This embodiment schematically illustrates the process by which commands are sent and data is transmitted for the host to copy data from the optical disk drive.

In the present invention, the measurement of the delay time according to the command processing used a program called 'Bus Hound' of Perisoft. The program can be stored in real time in the measurement of input and output, protocol, performance of any system, the command transmission and data transmission of the optical disk drive of the present invention can be measured in real time, and the measured transmission time is known. It is easily illustrated. Thus, in the present invention, the operation time of the optical disk drive was measured using the above program.

Referring to FIG. 1, part (a) indicates that a host issues a command to copy data from an optical disc drive, and part (b) indicates a response part of an optical disc drive to part (a). It is. Part (c) shows the time delay after the command for part (a) is finished and before the host issues the next ATAPI command.

FIG. 2 shows an ATAPI command for copying data from an audio / video disk at a host, and captures the actual process of transmitting data by the optical disk drive using the program 'Bus Hound'. One drawing.

Referring to FIG. 2, parts (a), (b) and (c) of FIG. 1 are shown with actual characters and numbers. In this embodiment, the third device in the host (the number indicates the interrupt ID value of each system). That is, the process of commanding the extraction of data to the optical disk drive. In FIG. 2, the host instructs data extraction 12 times to the optical disk drive, and the optical disk drive extracts data desired by the host for 12 times. The time until the host issued the data extraction command and the next extraction command was as follows.

Order One 2 3 4 5 6 7 8 9 10 11 12 time 138 yen 127 yen 128㎲ 131㎲ 127 yen 125 ㎲ 126 yen 126 yen 126 yen 125 ㎲ 128㎲ 132 yen

Looking at the table, the average time for the host to generate and delay commands is 128.25 ms, which is approximately 130 ms.

In other words, the command generated by the host and the response (b) after reading the data of audio / video for data copying from the optical disk drive is finished and before the new command is issued. It can be seen that the time interval (C) occurs continuously within about 130 ms.

3 is a time flow diagram for a command generated by a host when playing data on an audio or video disc according to an embodiment of the present invention, and FIG. 2 is an audio or video disc according to an embodiment of the present invention. This is a diagram illustrating the processing of a command actually generated by a host when playing data in the network.

In the above embodiment, the command processing includes the steps of the host generating a command to the optical disk drive, the optical disk drive transmitting data on the command generated on the optical disk, and delaying until the next command occurs. Include.

The above embodiment schematically illustrates a process in which a command is sent and data is transmitted for a host to play data on an optical disk drive.

In this embodiment, the delay time according to the command processing was also measured using the program of Perisoft Co., Ltd. 'Bus Hound' to measure the operation time of the optical disk drive.

Referring to FIG. 3, part (a) indicates that the host issues a command to play data from the optical disc drive, and part (b) shows a response part of the optical disc drive to part (a). Part (c) shows the time delay after the command for part (a) is finished and before the host issues the next ATAPI command.

FIG. 4 is a diagram illustrating a process of issuing an ATAPI command to play data on an audio / video disc at a host and a process of transmitting data from an optical disc drive to the command using the program 'Bus Hound'. Drawing.

Referring to FIG. 4, the parts (a), (b) and (c) of FIG. 1 are shown as actual characters and numbers. In this embodiment, the third device in the host (the number indicates the interrupt ID value of each system). That is, the process of commanding the reproduction of data to the optical disk drive. In FIG. 2, the host instructs the optical disk drive to play data 12 times, and the optical disk drive transmits data desired by the host for 12 times.

The time until the host issued the data playback command and the next playback command was as follows.

Order One 2 3 4 5 6 7 8 9 10 11 12 time  73㎳ 196㎳ 298 yen 197 yen 198 yen 17㎳ 176 yen 197 yen 197 yen 197 yen 199 yen 14㎳

Looking at the table, the sixth and twelfth are markedly off speed, but this is a case where a new event state occurs, and does not count in the playback speed calculation. Therefore, except for the sixth and twelfth times, the time for the host to generate and delay the command was 192.8 ms on average, recording a time of approximately 100 ms or more.

The reason why the delay time according to the play command is longer than the delay time according to the extract command is that the host receives data to be played from the optical disk drive at once, and then processes the video / audio data in the host to play the data ( play, it is possible to receive data every tens of microseconds from the optical disk drive.

As such, the delay time for the copy command and the delay time for the play command are remarkably different. The present invention distinguishes whether a command of a host is for extraction or reproduction by using the difference of the delay time.

5 is a flow chart according to an embodiment of the present invention, which shows a sequence when a reproduction command is changed to an extraction command.

The embodiment outlines a method of setting the proper double speed of an optical disc drive by calculating the difference between commands when playing and copying an audio / video disc.

Steps 501 and 502 are a process of searching for the necessity of the reproduction speed adjusting algorithm of the present invention for the optical recording medium inserted into the optical disc drive, and determining the type of optical recording medium currently inserted into the optical disc drive. . That is, it is not necessary to apply the present invention unless the optical recording medium existing in the optical disc drive is an audio disc or a video disc.

Step 503 is a process of searching whether the optical disk drive is buffering data, and checking whether a servo operation is currently occurring in the optical disk drive. That is, it is not necessary to apply the present invention if the servo action is not occurring.

Steps 504 to 506 show a process of increasing the rotational speed of the optical disc drive when the command generated by the host is changed from play to copy, and is achieved by the following process.

Firstly, it is checked whether the access position of the read-related ATAPI command issued by the current host has the access position and continuity of the read-related ATAPI command that occurred previously on the host. In other words, the continuity of the disk access position is examined.

Secondly, it is determined in which time range the interval between the read-related ATAPI command generated at the current host and the read-related command previously generated at the host falls. In other words, when a copy is performed, the command is continuously generated within about 130us, and when the play is performed, the command is continuously issued after 10ms, so a difference between the playback and the extraction can be found.

Third, even if the extraction and playback of the audio / video disc can be judged by the method described above, in order to increase the reliability of the determination, the algorithm for determining the relevant condition more than a certain number of times and then reproducing it at an appropriate speed is proposed. Apply.

Step 507 is a step of retrieving the delay time of the command generated by the host, checking whether the time for which the delay time is satisfied to be recognized as the reproduction or extraction is repeated a predetermined number of times and incrementing the counter.

During a copy to an audio / video disc, a read-related ATAPI command issued by the host does not immediately change the speed when a copy-related command is issued. If the speed is changed immediately, spin-up / down may occur, and the speed is increased by analyzing ATAPI commands related to reads of the host more than a certain number of times.

The same applies when a read-related ATAPI command issued by a host is issued during a copy to an audio / video disc. If the speed is changed immediately, spin-up / down may occur. Therefore, the speed is lowered by analyzing ATAPI commands of the host more than a certain number of times.

6 is a graph illustrating a transition rate for each data processing speed in an audio / video disc according to an embodiment of the present invention.

Part (a) is a section for determining the type of the inserted disk after the optical recording medium is inserted into the optical disk drive, and section (b) is a section for reading and interpreting the TOC of the optical disk drive. Section (c) is a section in which the playback is made at low speed (x6 to x15) in the host after the optical recording medium inserted into the optical disk drive is judged to be an audio / video disk. This section is to determine the copy to audio / video disc by applying the algorithm suggested in. Section (e) indicates that data is being copied to the audio / video disc. Section (f) is a section for analyzing Play-related ATAPI commands issued from the host to determine the playback of the audio / video disc. It is a section that plays after it is determined to play the video disc. Finally, the (h) section indicates the section in which the optical disk drive is idle because no command related to disk access in the optical disk drive is generated from the host.

As described above, it has been described with reference to the preferred embodiment of the present invention, but those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

As described above, according to the present invention, during playback, playback is performed at a lower playback speed, and when the disc is extracted for the purpose of backing up an audio disc or a video disc, the extraction speed is controlled at a high speed to reduce the extraction time. You can speed it up.

Claims (7)

a) determining the type of optical recording medium currently inserted in the optical disk drive; b) searching for whether a servo action of the optical disc drive is taking place; c1) searching whether the access position of the command generated at the current host is the access position and continuity of the command previously generated at the host; c2) calculating a time interval between a command generated at the current host and a command previously generated at the host, and based on this, if the time interval is repeated for a predetermined time, the command generated from the host to the optical disk drive is extracted. Determining that; And and d) increasing the speed of the optical disk drive when it is determined that the command issued by the host to the optical disk drive is extracted in step c2). Variable playback speed method. delete The method of claim 1, wherein the step c2) determines that the command generated by the host to the optical disk drive is extraction when the time interval between the command generated in the current host and the command previously generated in the host is within 130 ms. A variable playback speed suitable for the purpose of playing multi-purpose media in an optical disc drive. A) determining the type of optical recording medium currently inserted in the optical disk drive; B) searching for whether a servo action of the optical disc drive is taking place; C) searching whether the access position of the command generated at the current host is the access position and continuity of the command previously generated at the host; C) calculating a time interval between a command generated at the current host and a command previously generated at the host, and based on this, if the time interval is repeated for a predetermined time, the command generated from the host to the optical disk drive is Determining regeneration; And; And d) reducing the speed of the optical disk drive when it is determined in step c2 that the command issued by the host to the optical disk drive is to be played back. Variable play speed suitable for the purpose. delete 5. The method of claim 4, wherein the step c2 determines that the command generated by the host to the optical disk drive is a play when the time interval between the command generated in the current host and the command previously generated in the host is 100 ms or more. A variable playback speed suitable for the purpose of playing multi-purpose media in an optical disc drive. 7. An optical disc drive as claimed in any one of claims 1, 3, 4 and 6, characterized in that the type of optical recording medium in steps a) and / or a) is an audio or video disc. A variable playback speed suitable for the purpose of playing multi-purpose media in.

Images