JPH05205273A - Cd reproducer - Google Patents

Abstract

PURPOSE:To eliminate erroneous recognition of end position by providing means for making a decision that a position corresponding to an address is an end of recording position of a disc if reproducing operation from a position corresponding to a same address and an operation for detecting a part not yet recorded with information are repeated several times. CONSTITUTION:The CD reproducer comprises means for detecting a part on a disc under reproduction in which information is not yet recorded, and means for storing while updating the address at a reproducing position on the disc during reproduction of the disc and holding an immediately preceding address upon detection of a part not yet recorded with information. The CD reproducer further comprises a setup operation control means performing the setup operation at a position where the part not yet recorded with information is detected, and means for starting reproducing operation at a position corresponding to an address held in a memory means upon finish of setup operation. An end of recording position deciding means makes a decision that a position corresponding to the address is the end of recording position of the disc.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a CD (Compact Disk)
Reproduction device, especially CD-R (CD Recor
dable) recording end position detection technology of the disc during writing.

[0002]

2. Description of the Related Art Conventionally, a CD (Compact Disk) has been known as a recording medium for recording acoustic information and the like. This C
In D, as shown in FIG. 6A, the lead-in (Lead) in which the index information of the recording information is recorded from the inner circumference of the disc.
IN) area LIA, a program area PA in which actual music information and the like are recorded, a lead-out area LOA indicating the end of the program area PA,
Are sequentially formed. These lead-in areas LI
A, program area PA and lead-out area L
The OA is generically called an information area. The recorded signal is EFM (Eight to Fourteen Modulation)
This is a modulated digital signal, and includes a subcode such as a time code (time information) in addition to a main code (main information) such as music information. Index information called TOC (Table Of Contents) is recorded in the lead-in area LIA, and the total number of recorded information pieces (for example, the total number of songs) recorded in the program area of the disc and the total recording time (for example, total performance). Time) etc. is recorded as a subcode. Music information as a main code is recorded in the program area PA, and a track number (TNO) indicating a record information piece number (for example, a music number) is recorded in the Q channel of the subcode, and recording from the start of the track. Time (P-TIME: for example, performance time of the song), total recording time (A-TIME: measured from track number = 1)
For example, total playing time) is recorded. In the lead-out area LOA, a lead-out code indicating the lead-out area is recorded.

CD having such a recording format
Is a read-only recording medium, but in recent years it has been possible to add information while adopting the same format as a CD.
-R is being developed. The recording format standard of this CD-R is standardized to the standard called "Orange Book", and it is based on the CD format standard (Red Book).
As shown in (2) to, it is divided into three depending on the recording state. That is, a blank disc in which information has not yet been recorded, a disc in which information has been partially written (Partially Recorded Disk; hereinafter referred to as "PRD"), and recording is completed to a format similar to that of a CD. Is a finalized disk that has been finally formatted in order to do so. As shown in the figure,
Also in the CD-R, the lead-in area LIA, the program area PA and the lead-out area LOA are finally formatted similarly to the CD.

A guide groove is formed on the recording track of the CD-R, and the guide groove is a data (ATIP: Absolute Time In Pregroove) indicating the absolute time information of the carrier wave.
Wobbling (meandering) is carried out by the M-modulated frequency. In the CD-R recording / reproducing apparatus, recording / reproducing is performed on a blank disc or a PRD that is being written by performing tracking and spindle control by the guide groove. Also, PRD
In the lead-in area L, as shown in FIG.
A PMA as a temporary TOC area for storing the record history of record information is provided further inside the area I reserved for IA.
(Program Memory Area) is provided. This PM
The following three types of information are recorded in A. The first is the start address and end address of the recorded information recorded in the program area, which are recorded in the same format as the TOC information recorded in the lead-in area of the CD. The second is disc identification information (optional), and 6-digit (6-digit) numeric information for disc identification can be recorded if necessary. The third is skip command information and skip cancellation information, which are recorded information pieces (tracks) at the time of disc reproduction, or recorded information pieces (tracks).
This is information that allows you to skip a part of the above (time can be specified). Recording such information as a provisional TOC in the PMA is such that in the PRD, the information may be additionally written in the remaining program area PA, and thus until the final recording is instructed (finalization). Is T
This is because the OC information cannot be recorded in the lead-in area LIA.

In the PRD, the lead-in area LI
No information is written in the area A for A and the area O for the lead-out area LOA. Therefore,
Each area remains mirror-finished.
In the CD-R recording device, when finalization is instructed, predetermined information and the TOC information recorded in the PMA are sub-recorded in the lead-in area LIA area I in order to finally obtain the same format as the CD. It is recorded as a code, and a predetermined lead-out code indicating the lead-out area LOA is also recorded in the lead-out area LOA area O. As a result, the conventional CD player can play back the finalized CD-R.

[0006]

However, since the conventional CD player does not support the PRD and therefore the reproducible information is stored in the program area PA of the PRD, the information is not reproduced. Couldn't play. More specifically, as described above, PR
In D, although the TOC is recorded on the PMA provided on the inner peripheral side of the lead-in area, the conventional CD player does not have a mechanism for accessing the PMA. .. Further, the lead-in area LIA area I and the lead-out area L
This is because the OA area O also remains in a mirror-finished state, and the reading control has not been performed in the conventional CD player, such as the servo system going out of control when reading to that area.

On the other hand, even in a CD player,
It is conceivable to provide a mechanism for accessing the PMA, such as a CD-R recording / reproducing apparatus, and a means for reading the guide groove to perform tracking and spindle control. However, such means is provided only for the PRD. There was a problem in terms of cost effectiveness in preparing, and it was a problem.

On the other hand, in the conventional CD player, the lead-out area is detected during reproduction or fast-forward reproduction, or from the last track number (LTNO) indicating the last recorded information piece number based on the TOC information stored in advance during reproduction. By having a recording end of the disc being reproduced by detecting a large track number (TNO), it is possible to repeatedly reproduce from the recording start position of the disc again, or to have an automatic changer capable of automatically reproducing a plurality of discs. In a CD player, disks are exchanged.

However, even if the PRD program area PA is reproduced by the conventional CD player configuration,
There is no lead-out area in PRD and PMA
However, since the TOC information cannot be obtained, the final track number (LTNO) and the total recording time cannot be known, so that the recording end of the disc cannot be detected. More specifically, as shown in FIG. 7, there is a defect during reproduction (or during fast-forward reproduction), that is, an unrecorded area U.
When RA (Unrecorded Area; mirror surface) is detected (Fig. 7
(See (a)), and the setup operation is performed three times on the spot (see FIG. 7B). If the setup operation is not completed yet, after the setup operation is completed at the home position HP, the track jump is again performed to the position corresponding to the defect detection position, and the setup operation is attempted again (FIG. 7).
Therefore, the series of operations described above is to be repeated indefinitely. This is because in the conventional CD player, since the unrecorded area URA (mirror surface) should not exist in the area to be reproduced from the CD, it cannot be recognized as a mirror surface URA and is regarded as a defect such as a scratch and operates. This is because. In this case, the home position of PRD is
It is set in the program area PA.

Therefore, an object of the present invention is to provide a CD reproducing apparatus capable of detecting the recording end of a CD-R disc which is being written during reproduction or fast-forward reproduction.

[0011]

In order to solve the above problems, the present invention provides a CD reproducing apparatus capable of reproducing recorded information on a CD and reproducing recorded information in a program area of a CD-R during recording. An information unrecorded portion detecting means for detecting an information unrecorded portion in which information is not recorded on the disc being reproduced, and an address of the reproduction position on the disc being updated and stored while the disc is being reproduced, When an unrecorded portion of information is detected, an address storage means for holding an address immediately before that portion, and when the unrecorded portion of information is detected, a setup operation is performed at the detection position, and a setup operation can be performed at the detection position. If there is not, the setup operation control means for performing the setup operation at the reference setup position, and the setup operation control means Reproduction control means for performing a reproduction operation from a position corresponding to the address held by the address storage means when the setup operation at the reference setup position is completed, and a reproduction operation from the position corresponding to the address and the information not stored. A recording end position discriminating means for discriminating the position corresponding to the address as the recording end position of the disc when the operation of detecting the recording portion is repeated a predetermined number of times.

[0012]

According to the present invention, the information unrecorded portion detecting means is
An information unrecorded portion in which information is not recorded is detected in the disc being reproduced, and the address storage means holds the address immediately before that when the information unrecorded portion is detected. Further, the setup operation control means performs the setup operation at the detection position and performs the setup operation at the reference setup position when the setup operation cannot be performed at the detection position. Then, the reproduction control means
When the setup operation control means completes the setup operation at the reference setup position, the reproducing operation is performed from the position corresponding to the address held by the address storage means. In this way, when the reproduction operation from the position corresponding to the address and the information unrecorded portion detection operation are repeated a predetermined number of times, the recording end position determination means,
The position corresponding to the address held in the storage means is determined as the recording end position of the disc.

Therefore, the recording end position of the disc can be detected by detecting the information unrecorded portion without reading the PMA of the PRD. Furthermore, since the position is determined as the recording end position of the disc only when the reproduction operation from the position corresponding to the last reproduced address and the information unrecorded portion detection operation are repeated a predetermined number of times, Even if the middle portion is erroneously detected as an information unrecorded portion due to scratches or vibration, it is not erroneously determined as the recording end position.

[0014]

EXAMPLE An example of the present invention will be described below with reference to FIGS. First Embodiment FIG. 1 shows a basic block diagram of a CD player to which the present invention is applied.

In the CD player 100, the CD (or PRD, finalized CD-R) to be reproduced
A disk 1 is placed on a turntable (not shown). The spindle motor 2 drives the CD 1 to rotate based on the spindle servo control signal S _SC from the servo section 3. The pickup 4 reads the recorded data of the CD 1 and outputs it as a reproduction RF signal S _RF to the preamplifier unit 5. The preamplifier unit 5 amplifies the reproduction RF signal S _RF , outputs it to the decoder unit 6, and outputs it from the reproduction RF signal S _RF. The error signal S _ER is generated and output to the servo unit 3. The first servo unit 3A of the servo unit 3 generates a tracking error signal S _TE and a focusing error signal S _FE from the error signal S _ER and the control signal S _CON from the system controller 7, and performs tracking servo and focusing servo in the pickup 4. To do. Further, the first servo unit 3A performs a carriage servo for driving the carriage 8 based on the control signal S _CON from the system controller 7 and the error signal S _ER from the preamplifier unit 5. A home position detection switch 9 for detecting the home position of the carriage 8 is provided near the carriage 8 and outputs a home position detection signal S _HM to the system controller 7. Audio data decoding unit 6A of the decoder unit 6
Converts the input reproduction RF signal S _RF into a binary signal,
EFM (Eight to Fou)
rteen Moduration) Demodulates, performs signal processing such as error correction, and converts the audio data DAD to the D / A converter unit 10
Output to. Also, the control data included in the sub-coding is output to the control data decoding unit 6B. The control data decoding unit 6B decodes the control data _DCN , and the system controller 7
Output to. At the same time, the decoder unit 6 generates a spindle servo error signal S _SE from the input reproduction RF signal S _RF and outputs it to the second servo unit 3B. Second servo section 3
B functions as a spindle servo unit, outputs a spindle servo control signal S _SC to the spindle motor 2 based on the spindle servo error signal S _SE and the control signal S _CON , and drives the spindle motor 2 to rotate at a predetermined rotation speed. The D / A converter unit 10 D / A converts the input audio data D _AD and outputs it as S _OUT with an audio output signal. The system controller 7
Based on the control data _DCN and the operation control signal input from the display operation unit 11, the entire CD player 10
Memory 7 that controls 0 and stores various data
Have A. Further, the display operation unit 11 includes a display unit (not shown) for transmitting and displaying various information to the user, and performs various displays under the control of the system controller 7.

Before explaining the operation of the embodiment, the setup operation will be described. 1) Movement to the initial position In the setup operation, first, the pickup is moved to the initial position. For example, if the home position is set so that the beam spot position is a position with a radius of about 24 mm, the system controller 7 causes the first servo unit 3A to move.
Is controlled to drive the carriage 8 to convey the pickup 5 to the inner peripheral side of the CD 1. Pickup 4 by this
The beam spot position is moved to a position (initial position) closer to the center of the CD than the predetermined home position (radius of about 24 mm). In this case, the carriage 8 is moved by the radius of the beam spot and the recording track. It is performed by a radial servo that drives so that the relative speed in the direction becomes a constant value, but in this case, since the focus servo has not been applied yet, the relative speed cannot be detected,
It moves at the maximum speed that a carriage motor (not shown) can output. However, the time is short, and by applying the brake immediately thereafter, the carriage 8 moves while repeating a motion of slightly moving and stopping.

2) Moving to the starting position Next, the pickup 5 is moved to the starting position. As for the movement to the starting position, similarly to the movement to the initial position, this time the carriage 8 is moved to the outer peripheral side and the home position detection switch 9 is turned off, thereby detecting that the starting position is reached, Finish moving to the starting position. As a result, the starting position is located slightly outside the home position.

3) Turning on the semiconductor laser When the movement of the pickup to the starting position is completed, the system controller 7 turns on the semiconductor laser (not shown) in the pickup 4 and waits until the semiconductor laser becomes stable.

4) Focus Servo On When the semiconductor laser becomes stable, the system controller 7 turns on the focus servo.

5) Rotational drive of disk Next, the system controller 7 sends a large constant current to the spindle motor through the second servo section 3B of the servo section 3 to set the CD at the rotational speed at the time of reading on the inner circumference side. Accelerate to approximately equal to about 500 RPM.

6) Focus servo pull-in check Next, the system controller 7 checks whether or not the focus servo pull-in is successful.

7) Tracking servo ON When it is confirmed that the focus servo can be pulled in, the tracking servo and the carriage servo are turned on to check whether or not both servos have been pulled in.

8) Sync servo on After the tracking servo and the carriage servo are pulled in, the system controller 7 switches the spindle system servo to the sync servo, and thereafter, the sync servo ensures that the rotationally driven CD has a substantially correct linear velocity. Then, the spindle motor 2 is controlled.

9) PLL lock Immediately after the sync servo is turned on, the rotation of the spindle motor 2 is not always the correct linear velocity. Therefore, the system controller 7 detects the frame sync in the reproduction signal to control the rotation of the spindle motor 2 to be within a few percent of the correct linear velocity and lock the PLL.

By performing the processes 1) to 9) above, the setup operation is completed and the CD player shifts to the normal reproduction operation. The above operation is an example of the setup operation and is not limited to this. The above setup operation is for a normal CD, and when playing back a PRD, it is necessary to set the home position in the program area PA of the PRD.

Next, the operation flowcharts of FIGS.
And the recording end position with reference to FIG. 4 and FIG.
The detection process will be described. In this case, turntab
The PRD is placed on the
Playback of the program area PA after the setup operation is completed
(PLAY) or fast forward playback (FF: FAST FORWORD)
System controller
Indicates that normal playback or fast-forward playback is in progress.
If you are
Total recording time (A-TIME) measured from number 1
Are sequentially generated and stored as expected addresses.
To do. During normal playback, the actual playback
Is the track number in the subcoding included in the number = 1?
The total recording time (A-TIME) measured from
It is assumed that it is maintained while being updated as a service. In addition,
The memory 7A of the stem controller 7 has a mirror surface detection frequency check.
Check counter area and expected address holding area
Area and area for holding last address
It The initial value of the frequency counter is "0". When the end of recording is reached First, the system controller 7 is
Whether the address is equal to the current address, ie normal
It is determined whether or not reproduction is being performed (step S
1).

When the expected address is equal to the current address, it is judged whether or not the reproducing operation is continuously performed for 16 seconds or more (step S7), and the reproducing operation is continuously performed for 16 seconds or more. In this case, the frequency counter is reset (step S8) and the reproduction is continued. If the reproducing operation is not continuously performed for 16 seconds or more, the reproducing is continued as it is.

If the expected address is not equal to the current address, a track jump is made to the outer peripheral side corresponding to the expected address of the disc (step S2). After that, as shown in FIG. 4A, it is determined whether the mirror surface is detected by entering the unrecorded area URA (step S).
3). If the mirror surface is not detected, the process proceeds to step S1.

When the mirror surface is detected in the determination in step S3, the value of the number of times counter is incremented, and it is determined whether or not the mirror surface is detected for the third time, that is, the value of the number of times counter = 3 (step S4). ..

In this case, the spindle is stopped because it is the first time (the value of the number counter = 1) and the subcode cannot be read because it is a mirror surface (step S9). In this case, the last updated current address before stopping the spindle is stored in the memory 7A as the last address. Next, the setup operation is performed at this position. Thereafter, it is determined whether or not the setup operation has been performed (step S10), and if the setup operation cannot be performed, the setup operation is further performed.
It is determined whether or not it has been impossible to continue the operation based on the value of the frequency counter (step S12). In this way, when the setup operation cannot be performed three times in succession at that position (see FIG. 4B), the pickup is moved to the home position HP as shown in FIG. 4C, and the setup operation is performed. (Step S13). Next, it is determined whether or not the home position HP has been performed (step S14).

As shown in FIG. 4C, when the setup operation can be performed at the home position HP, a track jump is performed to a place LADR corresponding to the last address, and reproduction is performed from the place LADR corresponding to the last address. After the start, the processes from step S1 to step S4 are performed again. In this case as well, in the determination of step S4, since the mirror surface detection is still the second time, the process from step 9 onward is similarly performed.

Similarly, when the mirror surface detection is the third time (the value of the number of times counter = 3), the process branches to step S5 for the first time in the determination of step S4, and it is determined that the recording is the end (step S5). The spindle motor is stopped (step S6), and the process ends.

When the setup operation cannot be performed at the home position HP in the determination of step S14, it is determined whether or not the setup retry has already been performed 6 times (step S15). In this case, the setup retry is not performed yet, so the setup retry is performed. If the setup retry has already been performed six times, it is determined that the setup is impossible and the operation is stopped (step S16).

Next, in the setup retry,
It is determined how many times the setup retry process is performed, and if it is an even number, the normal home position HP
In step S19, the setup operation is performed, and in the case of an odd number of times, the setup operation is performed in the outer circumference home position set on the outer circumference side of the disk with respect to the normal home position HP (step S12). Then, it is again determined whether or not the setup operation has been performed (step S1
4) If the setup operation cannot be performed,
Similarly, the processing of step S15, step S17 and step S18 or step S19 is performed, and the setup operation is performed until the setup retry is six times. Therefore, in the setup retry routine, the setup operation at the normal home position and the setup operation at the outer circumference home position are alternately performed, and the setup is performed three times at the maximum normal home position HP and three times at the outer circumference home position. If the setup cannot be performed in any of the setup operations, it is determined that the setup is impossible, the operation is stopped (step S16), and the process is ended. The expected address and the current address are
When they do not match: As shown in FIG. 5A , when the expected address and the current address do not match due to vibrations or scratches in the portion other than the end of recording, the setup operation is performed at that position after the processing of steps S1 and S2. If this is done, the setup operation is possible at that position, so it is determined in step 3 that it is not a mirror surface, and the process proceeds to step 1. Since the expected address and the current address should match this time, the process proceeds to the determination in step 7, but since the reproduction should be possible for 16 seconds or more, the number counter is reset (step S8) and the reproduction operation continues. To be done.

In the above embodiment, the setup retry is limited to six times, but it is also possible to perform the setup retry twice or more times. Step 7 again
Although the continuous reproduction time is set to 16 seconds or more in the above determination, it is only necessary to set a sufficient time for determining the unrecorded area URA and a real defect (scratch, vibration, etc.). Further, the setup retry in the unrecorded area is limited to three times, but it can be set to any number.

[0036]

According to the present invention, when the reproducing operation and the information unrecorded portion detecting operation from the position corresponding to the address last held in the storage means are repeated a predetermined number of times, the recording end position discriminating means is The position corresponding to the address held in the storage means is determined as the recording end position of the disc.

Therefore, the recording end position of the disc can be detected by detecting the information unrecorded portion without reading the PMA of the PRD.
In the repetitive reproduction of D (repeat reproduction) and the disc change in the auto changer or the like, it can be easily performed as in the case of a normal CD. Furthermore, since the position is determined as the recording end position of the disc only when the reproduction operation from the position corresponding to the last reproduced address and the information unrecorded portion detection operation are repeated a predetermined number of times, Even if the middle portion is erroneously detected as an information unrecorded portion due to scratches or vibration, it is not erroneously determined as the recording end position.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a CD player according to an embodiment of the present invention.

FIG. 2 is an operation flowchart (1) showing the operation of the embodiment.
Is.

FIG. 3 is an operation flowchart (2) showing the operation of the embodiment.
Is.

FIG. 4 is a diagram (1) illustrating the operation of the embodiment.

FIG. 5 is a diagram (2) illustrating the operation of the embodiment.

FIG. 6 is an explanatory diagram of recording states of various discs.

FIG. 7 is an operation explanatory diagram of a conventional example.

[Explanation of symbols]

1 ... CD (or PRD, finalized CD
-R disk) 2 ... Spindle motor 3 ... Servo unit 3A ... First servo unit 3B ... Second servo unit 4 ... Pickup 5 ... Preamplifier unit 6 ... Decoder unit 6A ... Audio data decoding unit 6B ... Control data decoding unit 7 ... System Controller 7A ... Memory 8 ... Carriage 9 ... Home position detection switch 10 ... D / A converter section 11 ... Display operation section HP ... Home position PA ... Program area URA ... Unrecorded area D _AD ... Audio data D _cn … Control data S _SC … Spindle servo control signal S _RF … Playback RF signal S _ER … Error signal S _CON … Control signal S _TE … Tracking error signal S _FE … Focus error signal S _HM … Home position detection signal S _OUT … Audio output signal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Alex Bradshaw 25 Nishimachi, Yamada character, Kawagoe City, Saitama Prefecture 1 Pioneer Co., Ltd. Kawagoe factory (72) Inventor Kazuhiro Kiyoura 25, Nishimachi Yamada character, Kawagoe City, Saitama Prefecture Address 1 Pioneer Co., Ltd. Kawagoe Plant (72) Inventor Kiyoshi Kato 25 Nishimachi, Yamada, Kawagoe, Saitama Prefecture Address 1 Pioneer Co. Ltd. Kawagoe Plant, (72) Inventor Koichiro Haraguchi 25, Nishida Yamada, Kawagoe, Saitama Prefecture Address 1 Pioneer Corporation Kawagoe Factory

Claims (1)

[Claims] 1. A CD reproducing apparatus capable of reproducing recorded information of a CD and reproducing recorded information of a program area of a CD-R in the middle of recording, wherein no information is recorded on a disc being reproduced. An information unrecorded portion detecting means for detecting a portion, and storing while updating the address of the reproduction position on the disc while reproducing the disc, and when the information unrecorded portion is detected, the address immediately before that is recorded. Address storage means for holding and setup operation control for performing a setup operation at the detection position when the information unrecorded portion is detected, and performing a setup operation at the reference setup position when the setup operation cannot be performed at the detection position Means and the setup operation at the reference setup position by the setup operation control means. When the operation is completed, the reproduction control means for performing the reproduction operation from the position corresponding to the address held by the address storage means, and the reproduction operation from the position corresponding to the same address and the information unrecorded portion are detected. Recording end position discriminating means for discriminating the position corresponding to the address from the recording end position of the disc when the operation is repeated a predetermined number of times,
A CD reproducing device characterized by comprising: