WO1999012164A1

WO1999012164A1 - Optical disc reproducing device

Info

Publication number: WO1999012164A1
Application number: PCT/JP1998/003904
Authority: WO
Inventors: Toshiyuki Watanabe
Original assignee: Sanyo Electric Co., Ltd.
Priority date: 1997-08-29
Filing date: 1998-08-31
Publication date: 1999-03-11
Also published as: TW381260B

Abstract

Operations necessary for the reproduction of a DVD disc are performed by simple commands from a host CPU. Particularly various special reproduction operations specific to the DVD disc are controlled easily and a plurality of discs including the DVD disc can be controlled easily. Command instructions inputted from the outside are inputted to the CPU by an interface unit and a signal processing unit is controlled by the CPU in accordance with the command instructions. In the signal processing unit, the sets of data retrieval information of the respective data blocks of the DVD disc are analyzed and the signals of the DVD disc are detected in accordance with the analysis result. Further, the type of the disc is discriminated by a disc discriminating means and output signals supplied to an output interface are switched in accordance with the discrimination result.

Description

Details Optical disc playback device

Technical field

The present invention relates to an apparatus for reproducing digital video / audio information or the like recorded on an optical recording medium. Background art

The DVD (Digital Video Disc) format has been proposed as one of the methods for digitally recording video and audio on optical discs. D-VD (Digital Video Disc) format is a device that reads and reproduces discs recorded in accordance with this format by optical pickup. VD players have been developed and are becoming popular.

As shown in Fig. 1, the stand-alone type DVD player has the following functions: tracking control, focus servo control of the peak, signal processing control such as din / leave error correction, decoding of the MPEG bit stream, and the like. Control of mechanisms such as disk loading is performed by the host CPU.

In the DVD format, multi-angle playback and search playback for selectively playing back multiple videos are specified. To perform these special playbacks, the data at the beginning of each video data block is specified. It is necessary to detect and analyze the search information and search for the next data to be reproduced.

When performing this multi-angle playback or search playback, it is necessary to monitor the status and to perform high-speed read control on the sectors to be read next and the read control. This increases the load on the PU, and as a result, the output video may not be displayed continuously and smoothly.

The present invention has been made in view of the above circumstances, and makes it possible to perform operations necessary for reproducing a DVD disk without burdening a host CPU, and to easily control special reproduction such as a multi-angle function. Is a technical issue. Disclosure of the invention

An optical disc reproducing apparatus according to the present invention is an optical disc reproducing apparatus for reading out a video or audio signal recorded on an optical recording medium in a digital manner, comprising: a pickup for detecting a signal of the optical recording medium; and a signal detected by the pickup. A CPU that controls the signal processing unit, and an interface unit that externally inputs an instruction command to the CPU. The CPU issues an instruction command to be input to the interface unit. The signal of the optical recording medium is detected by the pickup based on the above, and the processing of the signal processing unit is performed.

Further, the signal processing unit analyzes data search information of each video data program of the recording medium, and detects a signal of the recording medium based on a result of the input data. Further, the optical disc reproducing apparatus has a disc discriminating means for discriminating a disc type, and uses the discrimination result by the disc discriminating means as a status information signal; It is characterized in that the output signal supplied to the switch is switched. BRIEF DESCRIPTION OF THE FIGURES

Fig. 1 is a block diagram of a stand-alone type D VD player, Fig. 2 Fig. 3 is a block diagram of the disk reproducing apparatus according to the present invention; Fig. 3 is a table showing input / output signals of the disk reproducing apparatus according to the present invention; Fig. 4 is a command table for controlling the disk reproducing apparatus according to the present invention; FIG. 5 is a table showing an interface signal of the disk reproducing apparatus according to the present invention. FIG. 6 is a flowchart showing the operation of the START JJMT command. FIG. 7 is a flowchart showing the discrimination processing of the disc. FIG. 9 is an operation flowchart of a RESTART—UNIT command, FIG. 10 is a flowchart of a special reproduction process, FIG. 11 is an operation flowchart of a seek process, FIG. 12 is an operation flowchart of an ECC buffer check process, and FIG. Fig. 13 is a flowchart of the import completion processing, Fig. 14 is an operation flowchart of the data retrieval processing, and Fig. 15 is the cell Shows the data structure, FIG. 16 Ru FIG der showing the configuration of a video data Proc. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a disk reproducing apparatus according to the present invention will be described.

FIG. 2 is a block diagram of a disk reproducing apparatus according to the present invention.

In the figure, (1) is an optical recording medium, which is a DVD disk or a CD disk. (2) is an optical pickup, which performs signal detection by switching to a mode corresponding to the optical recording medium (1).

(3) is a spindle motor in which the optical recording medium (1) is rotated by the spindle driver (6).

(4) is an RF amplifier, which amplifies the sensor output signal from the optical pickup (2).

(5) is a DSP, which performs signal control when playing a CD disk. (6) is a spindle motor driver, which drives the spindle motor (3).

(7) is a DVD data processor, which performs signal processing at the time of reproducing a DVD disc.

(8) is a memory, which is a buffer used for processing by the DVD data processor.

(9) is a CPU, which outputs a control instruction to each of the above units according to a program.

(10) is a flash memory, which is used as a work area of the CPU (9).

(11) is a loading section for performing a disc loading operation.

(12) is a DVD / CD selector, which is selected and output according to the type of disc to be played.

The output signal is connected to a DVD decoder section (14) by a DVD / CD interface (13), and after being deciphered and decoded, D / A converted and output as a video or audio signal.

This device and the host CPU (15) are connected via the interface (16).

The interface (16) is a clock synchronous serial I / F that sends commands to the CPU (9), receives status signals from the CPU (9), and receives various information from the CPU (9). Do.

The DVD / CD interface (13) consists of output of data decoded from the data read from the optical recording medium (1) and control lines for handshaking.

Figure 3 shows the input / output signals of the DVD / CD interface (13).

The procedure for sending and receiving commands of interface (16) is as follows.

First, if RTS is L (low repelle), communication is possible, and the host outputs CLK for 8 cycles. Next, TxD (transmit data) is given in synchronization with the falling edge of CLK. At the same time, RxD (reception data overnight) is obtained in synchronization with the falling edge of CLK.

Here, by setting a command in the first byte of the transmission data, the host sends an instruction to the drive.

This command is specified as shown in Fig. 4.

A command for the purpose of “drive control” (Type A), a command for receiving the information acquired by the drive by sending an opcode and arguments as received data via the interface (16) (Type B), It consists of three types of commands for obtaining status information (Type C).

The status information is an information byte that checks the operation status of the drive. To smoothly control the drive, the host CPU analyzes this status information, and based on the result, enables commands to be given to the drive.

This status information is transferred from the drive as the second byte of TxD data for each command.

The contents of the status byte are as follows.

B i t 0: Error 0 (the sent opcode is not executable)

1: One error 1 (The previous command could not be executed)

2: BUSY (command is being executed)

3: PLAY (Operation status is PL AY)

4: COMQUE (command is already in the command queue) 5: EMPTY (track buffer is empty)

6: READ (during writing to track buffer)

7: COMBUSY (commands other than NOP are not accepted) Processing by the above commands is based on the DVD / CD interface signal shown in Fig. 5. The following data is transmitted and received.

Data is transmitted in 2064 bytes / 1 sector, and SDTi (8-bit data), DACK, and DBGN are output in synchronization with DCLK.

DCLK is 3.375MHz and outputs SDTi (8-bit data), DACK and SYNC in synchronization with the falling edge.

DERR indicates that an error is included when L in sector units (synchronized with DBGN). The data is transferred via a track buffer that fits up to 192 sectors, and the transfer starts as soon as the drive becomes available.

The data I / F for CD uses SDT i (i = 0 to 7).

The STARTJJNIT, STOP.UIT, and RESTART.UNIT commands are processed according to the flowcharts in Figs.

If the CD is determined to be a CD disk by the STARTJJNIT command, SDT i switches for CD as follows.

SDT0 → AOUT (serial CD data stream)

SDT I → LRCK (channel clock)

SDT2 → BCK (Serial CD data overnight clock)

SDT 3 → IPF (Serial CD error pointer)

SDT4 → SDATA (serial subcode data)

SDT 5 → SFSY (frame sync)

SDT6 → SBSY (subcode sync)

SDT 7 → CCLK (serial subcode clock)

384 fs is a CD decoding clock, and the demodulation of the CD disk is demodulated and output by this clock. The basic frequency of this clock is 16. 9344 MHz.

For example, when playing a Video CD, this clock is supplied from the host side, and the CD output is output in synchronization with this.

This makes it possible for the host to easily control the buffer memory of the MPEG decoder so that it does not become "full" or "empty".

The DVD and CD are controlled by the command 15 shown in FIG.

The DVD-specific commands are the PLAY_DVD command for reading the logical block address, the SEND LBA command for sending the logical block address, the CHANGE ANGLE command for switching angles during multi-angle playback, and the MODE SEARCH command for checking the mode. By using these commands, it becomes easy to create “drive control software” to realize a “multi-disc player”, and the playback of a DVD disc can be controlled with the above four commands.

Hereinafter, the operation processing of the DVD dedicated command will be described.

The contents and operation processing of each command are as follows.

(1) PLAY—DVD command (Opcode: 28)

This command performs various playback operations based on the playback method, start logical block address, and end logical block address specified by the arguments.

The first argument specifies the processing method for the block in which the correction error has occurred, and the lower argument specifies the playback method using the PLAYDVD command during the current operation.

First argument: X0 ABORT & PLAY

XI Seamless PLAY

0 Do not re-read even if an error occurs

1 したら Re-read only once if an error occurs 2 Reread up to 15 times if a Y error occurs

The next playback operation is performed based on the start logical block address set in the second to fifth arguments and the end logical block address set in the sixth to ninth arguments.

The seek logical block address is sought, and after the seek is completed, the status bit “READ” is set to 1, and the data is stored in the track buffer and the error correction circuit is operated.

When the next logical block address is reached or when there is no next command in the command queue, the status bit “BUSY” is set to 0 and “RAED” is set to 0, and a standby state is set at that position.

When an ABORT command is received before reaching the end logical block address, the standby state is set immediately at that position, the status bit "BUSY" is set to 0, "COMQUE" is set to 0, and then EMPTY is set to 1.

No. 10-: The L3 argument is an argument that is referenced at the time of REW playback that requires forward playback from the last video data block of the cell.

When "seamless PL AY" is selected, command queuing is possible. Even if there is no special specification, if the specified cell is left in the evening, it is read into the track buffer accordingly.

Set status bit BUSY to 1 until all sectors are stored in the track buffer. When using this command for normal AV playback operation, the 2nd to 13th arguments specify the logical block address of one cell.

When ABORT & PLAY playback is specified by the first argument, even if there is something currently being written to the track buffer, it is canceled, the track buffer is flushed, and writing to the track buffer is started from the given address. start. Then, clear the cue buffer and clear all the special playback conditions specified by MODE SACH. (2) MODESACH (Opcode: 55)

This command performs a search and skip playback according to the condition specified by the first argument.

1st argument 00 (normal PLAY)

03 (up to ISTJEF)

05 (up to 2NDJEF)

07 (up to 3RDJEF in the forward direction)

0B (Up to 1STJEF in the forward direction) + (1 image data overnight block skip

0D (up to 2NDJEF in the positive direction) + (1 video / overnight block skip

OF (up to 3RDJEF in the forward direction) + (1 video / overnight block skip

13 (Up to 1 STJEF in the forward direction) + (2 video data block skips)

15 (forward 2NDJEF) + (2 video data block skip

17 (up to 3RDJEF in the forward direction) + (2 video data overnight block skip

23 (down to 1STJEF)

25 (up to 2NDJEF in the negative direction)

27 (up to 3RDJEF in the negative direction)

2B (negative direction up to 1STJEF) + (1 video block overnight block skip)

2D (up to 2NDJEF in the negative direction) + (1 video data block skip

2 F (Up to 3RDJEF in the negative direction) + (Skip one video image overnight)

33 (up to 1STJEF in the negative direction) + (2 video data overnight block skip 35 (up to 2NDJEF in the negative direction) + (2 video data block skip 37 (up to 3RD REF in the negative direction) + (2 video data overnight block skip) As shown in Fig. 16, 1ST EF, 2ND EF, and 3RD REF are contained within one video block. And the start position address of the n-th picture data of the MPEG.

(3) CHANGE ANGLE (Opcode: 58)

This command changes the angle of the currently executing PLAY_DVD command to the number specified by the first bow I number.

First argument: Angle number

2nd to 5th arguments: New angle cell start logical block address

6th to 9th arguments: New angle cell ending logical block address

Arguments 10-13: Last video data block of new angle cell Top logical block address

The specified angle number must be an actual number.

The 2nd to 13th bow I numbers give the various logical block addresses of the cell.

This is necessary for the drive to recognize the end of 1-cell playback after an angle change.

If the above issuance conditions are not satisfied, the status bit “Error 0” is set to 1.If the cell that was playing at the time of issuing the command was not interleaved or failed to change the angle, "1" to "1".

After issuing the command, set “COMBUSY” to 1 until the operation is completed.

(4) SEND LBA (Opcode: 44)

This command uses a logical address to indicate which section of the DVD is currently being processed by the drive.

First argument: 00 Current position of pickup (logical address)

01 Logical address during writing to track buffer

02 Top logical address of the most recently corrected ECC block 0 3 Issued when the logical address “CO MB USY” of the sector being transferred from the AV bus is 0 and the “disk” is DVD. If this condition is not satisfied, the status bit “error 0” is set to 1. .

When the DVD-READ command, the CHANGE_ANGLE command, and the MODESACH command, which are the above-mentioned DVD special playback commands, are received, the drive performs the following processing. The operations for performing these special reproduction processes are shown in the flowcharts of FIG. 10 to FIG. First, the following parameters are set as preparation for playback disclosure in STEP 1 of FIG.

Starting address str— adr = TOP— ADR

End address end_adr = OVER— ADR

End flag: LCELLOVER = 1

After setting parameters, seek processing is performed next (STEP2) o

In the seek process, the ECC block containing str_adr is searched, and the data of one block is fetched into the buffer and error correction is performed.

The operation flow of the seek process is shown in FIG.

The operation to seek the ECC block including str_adr is as follows. First, it is checked whether it is within one track before str_adr (STEP3).

If it is not within one track, repeat the track jump until it is within one track (STEP 4).

If it is within one track, it checks whether it is within one sector of str-adr (STEP5).

If it is not within one sector, read the address sequentially until it is within one sector. When it is within one sector, one block of data from the beginning of the next sector is loaded into the track buffer (STEP 6). After that, error correction processing of the fetched ECC block is performed (STEP 7).

In addition, perform ECC buffer check processing (STEP8) o

FIG. 12 shows the operation of the ECC buffer check process.

In the ECC buffer check, the header of each section in the ECC block is checked for each ECC block (STEPll), and when the search information is detected in the header, the data search information processing is performed (STEP 12). ).

This operation is performed until the end-adr is captured (STEP 9), and the capture completion processing is performed when the end-adr is captured (STEP 10).

In the capture completion task, as shown in Fig. 13, by checking the state of the f-CELLOVER flag, if it is determined that there is no video data block to be captured next, the search reproduction operation ends.

If there is a video data block to be imported next, set OVER_ADR in end_adr and perform a seek task.

The operation flow of data search information processing is shown in FIG.

In the structure of the video data overnight block, as shown in FIG. 15, data overnight search information is added to the head of each variable-length video data.

Information for handling multiple video data blocks as one cell is also stored in the data search information.

The overnight search information processing in FIG. 14 is a process for analyzing each overnight search information and performing reproduction based on this information. When the special reproduction request flag f_ScanPlay is set, the end address is processed. end—Change adr and calculate next start address str—adr and set. When the database search information processing is started, first, the following various information is read from the database search information (STEP 17). 1ST_REF, 2ND_REF, 3RD_REF

Address information for seamless playback SML

Address information for multi-angle playback AGL

Video block search address information B_SM

UnitEnd flag A flag indicating that it is the last video data block in one cell.

LANGLCHNG flag A flag indicating that the video is compatible with multi-angle and that the angle can be changed.

When these pieces of information are read, it is next determined whether or not the special playback request flag f_ScanPlay is set (STEP 18).

If the special playback request flag f_ScanPlay is set, reset the f—OVERCELL flag (STEP 19) and set the end address end_adr to n_REF + Navi_adr

Here, n is 1ST, 2ND, 3RD, which is selected according to the command argument.

Navi_adr is the first address of the data block of the video data block currently being processed, and the address value is determined based on Navi_adr because the above various information is relative address information.

After that, f_ANGLCHNG is checked (STEP 21). If the flag is set, the UnitEnd flag is further checked (STEP 22).

If the UnitEnd flag is set, the str_adr is set to SML + Navi_adr, and the f_ANGLCHNG flag is reset (STEP 24).

If the UnitEnd flag has not been set in STEP 22, the str_adr is set to BSRI + Navi adr. If the f_ANGLCHNG flag is not set in STEP 21, it is checked whether or not the next video data block to be reproduced exists in the cell.

If the next video data block to be reproduced exists in the cell, str_adr is set to B_SM + Navi_adr (STEP 26).

If there is no next video data block to be reproduced in the cell in STEP23, the f_OVERCELL flag is reset (STEP27).

After that, returning to STEP9, seek is performed based on the set end-adr and str_adr, and data is sequentially taken into the buffer.

As a result, data can be sequentially transmitted to the host according to the search information, and various kinds of special reproduction can be performed.

As described above, according to the disc reproducing apparatus of the present invention, the host-side CPU can check the status information and output a command to facilitate the control of the drive unit, and the DVD-specific multi-angle reproduction can be performed. Etc. can be easily and seamlessly performed. Industrial applicability

INDUSTRIAL APPLICABILITY The present invention is suitable for use in an optical disc reproducing apparatus such as a DVD player and a CD player.

Claims

The scope of the claims

1. Hikarito In an optical disc playback device that reads out video or audio signals that have been digitized in a certain body,

Said light word, a peak for detecting a signal of a certain body,

A signal unit for performing ^ β of the signal detected by the pickup;

C PU who does $ lord of the signal «

An interface section for inputting an instruction command from the outside to the CPU; and the CPU transmits the optical signal B ^ a certain body signal by the pickup based on the instruction command input to the interface section. An optical disc reproducing apparatus for detecting and performing the above-mentioned signal assignment.

2. The optical disk reproducing apparatus according to claim 1, wherein the optical medium is a DVD disk.

3. The method according to claim 1, wherein the signal β section includes data return information of each data block of the medium, and detects the signal of the language medium based on a result of the data. 3. The optical disc playback device according to 2.

4. The optical disk playback device according to claim 1, wherein the optical disk playback device has disk determination means for determining the type of the disk, and a determination result by the disk determination means is used as a status information signal. apparatus.

5. The optical disc reproducing apparatus according to claim 1, wherein the optical disc reproducing apparatus includes a queue buffer for temporarily storing an instruction command in the machine.

6. An output interface for digitally outputting the output of the signal processing unit, and an output signal applied to the output interface according to the discrimination result of the disc discriminating means. 3. The optical disc reproducing device according to claim 1, wherein the optical disc reproducing device is switched.

7. The optical disk reproduction device according to claim 6, wherein data is output from the output plane in synchronization with a clock input to the λ plane.

8. The above-mentioned indication instruction is an instruction to perform reproduction, and the optical disk reproduction method according to claim 3, wherein the reproduction of the address set based on the data is performed.