JPH0620409A - Record information search method for cd reproducing device - Google Patents

Abstract

PURPOSE:To efficiently reproduce recorded information of a PRD by returning a pickup to a jump position before the occurrence of abnormality to jump the pickup over the number of recording tracks of minimum information or smaller in the case of the occurrence of read abnormality during recorded information search. CONSTITUTION:A track number (TNO) designated by the reproducing command from a display and operation part 9 is set as a target A. A servo part 5 is controlled to search recorded information by track jump. A subcode B in the jump position is read and is stored in a memory M, and the TNO (B) indicated by the subcode and the target TNO (A) are compared with each other. If they do not coincide with each other, the pickup is jumped over tracks. If the subcode is not normally read in the jump position, abnormality is decided and a motor 1 is stopped. The pickup is returned to the jump position before the occurrence of abnormality and is jumped from this position over the number of recording tracks of preliminarily determined minimum information or smaller, and last recorded information is detected with the subcode B read in the jump position just before the occurrence of abnormality.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a CD (Compact Disk)
In connection with a recorded information search method of a reproducing apparatus, particularly, in a CD reproducing apparatus capable of reproducing a recordable disc of a recordable CD-R (CD Recordable), the last recorded information of a program area of the disc being written is searched. Regarding the method.

[0002]

2. Description of the Related Art Conventionally, a CD has been known as a recording medium for recording acoustic information and the like. This CD contains
As shown in (1), from the inner circumference of the disc, a lead-in area in which index information of recorded information is recorded, a program area in which actual music information is recorded, and the end of the program area Readout (Le
ad OUT) area is formed in sequence. The recorded signal is a digital signal modulated by EFM (Eight to Fourteen Modulation), and includes subcodes such as time code (time information) in addition to main code (main information) such as music information. There is. Index information called TOC (Table Of Contents) is recorded in the lead-in area, and the total number of pieces of recorded information (for example, the total number of songs) recorded in the program area of the disc and the total recording time (for example, total playing time) are recorded. ) Etc. are recorded as a subcode.
Music information as a main code is recorded in the program area, and a track number (TNO) indicating a record information piece number (for example, song number) and a recording time from the track start (in the Q channel of the subcode). P-TIM
E: For example, the performance time of the song), the total recording time measured from TNO = 1 (A-TIME: Total performance time), and the like are recorded. In the lead-out area, a lead-out code indicating the lead-out area is recorded.

In the CD reproducing apparatus for reproducing the recorded information on the CD, when the CD is set, the pickup is moved to a predetermined position (home position), and then the CD is rotated so that the information can be read. Set up
After setup is completed, the lead-in area will open the TOC
It is designed to read information. Normally, since the TOC information includes the track number (LTNO) of the last recorded information piece in the program area, even if a reproduction designation with a number equal to or higher than the LTNO is specified, it cannot be accepted. However, when the TOC information is read, there are cases where the TOC information cannot be obtained due to a scratch on the disc or the like. At that time, the information in the program area is reproduced without the TOC information. If the TOC information cannot be read, the LTNO cannot be obtained in advance. Therefore, when the reproduction instruction input of the last recorded information is input, the search is performed to detect the LTNO.

FIGS. 6 to 6 are explanatory views of the processing operation in the LTNO search. In the LTNO search, first, the target TNO is set to 99 which is the maximum TNO, and the search is performed in the outer peripheral direction. The search is usually speeded up by a jump (hereinafter referred to as "Tr jump") that skips about 100 recording tracks on the disc. As shown in FIG. 6, when 99 information is not recorded, the lead-out area is detected in this search. When the lead-out area is detected, the search is terminated, and then 10 Tr jumpback is performed until the program area is detected, as shown in FIG. The 10Tr jump is a jump in which the skipped time is a predetermined minimum recording time (4 seconds) of one piece of information. Therefore, the position where the program area is detected in the 10Tr jumpback is the recording area of the last recording information, and the TNO indicated by the subcode read there is LTNO. As a result, the LTNO is detected and stored, and as shown in FIG. 6, after the LTNO is detected, it moves to the beginning of the information indicated by the TNO and the last recorded information is reproduced. After that, the stored LTNO is referred to and the search is performed.

By the way, the CD having the above-mentioned recording format is a read-only recording medium, but in recent years, a CD-R has been developed which enables additional recording of information while adopting the same format as the CD.

The recording format standard of this CD-R is unified to the standard called "Orange Book", and is based on the CD format standard (Red Book). This CD-R disc is shown in FIG.
As shown in FIG. 3, the recording state is divided into three. That is :: a blank disc in which information has not been recorded yet, which is an unrecorded state ,: a partially written disc (partially recorded disc)
c; hereinafter referred to as “PRD”) :: Complete recording C
A finalized formatted disc (Finalized Dis) that is almost the same format as D.
c), As shown in the figure, also in the CD-R, the lead-in area, the program area, and the lead-out area are finally formatted similarly to the CD.

A guide groove is formed in the recording track of the CD-R, and the guide groove uses data indicating the carrier wave as absolute time information (ATIP: Absolute Time In Pregroov).
Wobbling (meandering) by the frequency modulated by FM in e)
Has been done. 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. Further, as shown in FIG. 4B, the PRD has a PMA (Program Memory A) as a temporary TOC area for storing the recording history of the recording information further inside the lead-in area I.
rea) is provided. The following three types of information are recorded in this PMA. 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 (option), 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 is information for skipping each recording area designated by TNO designated at the time of disc reproduction or a part (time designation is possible) in the recording area designated by TNO. . Recording such information as a temporary TOC in the PMA is because information may be additionally written in the remaining program area in the PRD, so until the final recording is instructed (finalization). This is because TOC information cannot be recorded in the lead-in area.

In the PRD, no information is written in the lead-in area I and the lead-out area O. Therefore, each area remains mirror-finished. In the CD-R recording device, when the finalization is instructed, predetermined information is recorded in the lead-in area I and the TO recorded in the PMA in order to finally obtain the same format as the CD.
C information is recorded as a subcode, and predetermined information indicating the area is also recorded in the lead-out area O as a subcode. As a result, the conventional CD reproducing apparatus can reproduce the finalized CD-R.

[0009]

Although such a write-once CD-R has been developed and used, the conventional CD-R has been developed.
In the playback device, the finalized CD-R
Although the PRD can be reproduced, the PRD was not designed to be reproduced although the reproducible information is stored in the program area.
This is because, as described above, in the PRD, the TOC is recorded on the PMA provided on the inner peripheral side of the lead-in area. However, the conventional CD reproducing device has a mechanism for accessing the PMA. Didn't. Also,
The lead-in area and the lead-out area are also mirror-finished, and in the conventional CD reproducing apparatus, there is no read control such as the servo system going out of control when reading to that area.

For this reason, in order to expand the range of use of the CD-R, a CD reproducing device has been developed which is capable of reproducing the program area only by a control change, corresponding to the PRD. However, in the conventional CD player, the PRD
When attempting to reproduce, the TOC information cannot be obtained because the PRD PMA cannot be accessed as described above, and therefore the LTNO cannot be obtained in advance. Therefore, when there is an instruction to reproduce the last recorded information in the program area, it is necessary to search for LTNO. However, as described above, the lead-out code is not recorded after the information recording area in the PRD program area and the mirror surface is not recorded. Therefore, as shown in FIG. 6, in the conventional search, LTNO could not be detected, for example, the mirror entered the mirror surface and the spindle went out of control, which required setup.

The present invention has been made in view of the above problems, and is a PRD which is a disc in the middle of writing a CD-R.
It is an object of the present invention to provide a recorded information search method for a CD reproducing device which enables the reproduction of the recorded information of the PRD to be made efficient by making it possible to search the recorded information at the end of the program area.

[0012]

The means of the present invention for solving the above-mentioned problems is a recording of a CD reproducing device for moving the pickup by a jump for skipping a predetermined number of tracks and searching the last recorded information in the program area. An information search method, wherein subcodes read at the jump position are sequentially stored, and when a read error occurs in the search, the pickup is returned to the jump position before the error occurred, and then from that position. A CD reproducing device for performing the search by a jump having a predetermined number of recording tracks of the minimum information or less and detecting the last recorded information by the subcode read at the jump position immediately before when a read error occurs again. Is a recording information search method.

[0013]

In the recorded information search method of the CD reproducing apparatus of the present invention, when the last recorded information is searched for the PRD whose area after the program area is a mirror surface, for example, the pickup is a mirror surface after the program area. Entering the section, an abnormal reading is detected. Since the subcode read at the jump position immediately before the occurrence of the abnormality is stored, the pickup is moved to the position indicated by the stored subcode. Then, from that position, the search is performed by changing the number of tracks to jump. Since the number of jump tracks is the number of recording tracks when the predetermined minimum information is recorded,
The search is performed without jumping over the minimum recorded information, and the last recorded information in the program area is detected by the subcode at the jump position immediately before the occurrence of another read error.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of a CD reproducing apparatus to which the present invention is applied.

As shown in FIG. 1, a CD reproducing apparatus to which the present invention is applied is a spindle motor 1 for rotating and driving a disk D, and a pit on the disk D is irradiated with a laser spot to photoelectrically convert the reflected light to RF. A pickup 2 that reproduces a signal, and a servo mechanism 3 that moves the pickup 2 in the radial direction of the disk D to position it on an information track.
An automatic power controller (APC) 4 for keeping the output of laser light in the pickup 2 constant, the spindle motor 1, the pickup 2, and the servomechanism 3.
Servo section 5 for servo-controlling, pre-amplifier section 6 for amplifying the RF signal reproduced from pickup 2 and generating a servo control signal to servo section 5, and RF signal amplified by pre-amplifier section 6 for EFM demodulation The audio data generated in the decoder unit 7 and the decoder unit 7 that reproduces the control data from the sub-coating and generates the servo control signal of the spindle servo while reproducing the audio data by performing signal processing such as error correction. A D / A converter unit 8 for D / A conversion to generate an audio output, a display / operation unit 9 for displaying an operation state and for inputting operation instructions, a microprocessor, a memory, etc., and controls the entire apparatus. The system controller unit 10 is provided.

When the disk D is set, the system controller section 10 first drives the servomechanism 3 via the servo section 5 to move the pickup 2 to a home position set near the innermost circumference of the program area. Set up. In the setup, the spindle motor 1 is driven to sequentially turn on each servo so that information can be reproduced. In this setup, when the position of the disc D corresponding to the position of the home position is scratched, or when it is a mirror surface portion of the PRD, setup may not be possible. In this case, the pickup 2 is moved to the outer peripheral side from the home position and set up again, and control is performed so that the recorded information of the innermost peripheral of the program area can be reproduced.

When the setup is completed, the TOC information reading process is performed next. Depending on the result of this TOC information reading process, "Normal CD with TOC" or "TOC
It is discriminated whether it is a “normal CD without C” or a “PRD” indicating a disc in the middle of writing of a CD-R which is a recordable disc, and it is stored as disc discrimination information. After that, when the recorded information in the program area is reproduced by an operation input from the display / operation unit 9, processing control corresponding to the disc identification information is performed.

When the disc D to be reproduced is discriminated to be "PRD", the LTNO indicating the last recorded information is "9".
9 "is set and stored. Then, when there is a reproduction instruction input for the last recorded information from the display / operation unit 9, the system controller unit 10 starts the search with LTNO = 99 as a target. Performed by a 100Tr jump.

Referring to FIG. 2, the search for the last recorded information in the program area of this embodiment will be described. (1) First, in the search of the program area toward the outer peripheral direction of the PRD, the subcodes read at the jump position are sequentially stored. Then, as shown in FIG. 2, when the pickup 2 enters the mirror surface portion and an error occurs in reading at the jump position, the search is stopped and the spindle motor 1 is stopped, and the stored immediately before the error occurs. It holds a subcode (M) containing the address of the jump position.

(2) Next, as shown in FIG. 2, the pickup 2 is returned from the abnormal position to the inner peripheral side. The return position is a fixed amount depending on the home position or the size of the jump.

(3) Then, the setup is performed at the position where the pickup 2 is returned to the inner peripheral side. If you can't set up, move to the home position again, or return to the inner circumference for a certain time and repeat until you can set up.

(4) When the setup is completed, FIG.
As shown in, the search is performed toward the outer circumference side with the address (M) of the held jump position immediately before the occurrence of the abnormality as a temporary target. At the time of search, the current position is compared with the position of (M), and the search is performed by jumping outside the position of (M) so as not to stop.

(5) When the position (M) is searched, as shown in FIG. 2, from the position, a 10Tr jump, which is less than the number of recording tracks on the disc when the predetermined minimum information is recorded, is performed. , Continue the search on the outer circumference side. Also in the search, the read subcodes indicating the addresses of the jump positions are sequentially stored.

(6) In the search by the 10Tr jump, when the mirror surface portion is entered and the reading error occurs again, the recording area indicated by TNO included in the sub-code (C) read at the jump position immediately before the error occurs. The information is determined to be the last recorded information in the program area, and its TNO is stored as LTNO. And L
A cue search of the recording area indicated by TNO is performed, and reproduction is performed as the last recorded information.
To search the last recorded information.

(7) Further, when the number of jumps is counted in the search by the 10Tr jump, and if the abnormality does not occur even after jumping 30 times, it is judged that the abnormality is caused by the scratch or vibration of the disk, and the result shown in FIG. As shown in
The search by the 10Tr jump is stopped, and the normal search is executed again from that position.

Next, the processing of the system controller unit 10 that controls the above-described search will be described in detail with reference to the flowcharts shown in FIGS. First, the TNO designated by the reproduction command from the display / operation unit 9 is set as the target (A) (step S1). In this case, when the reproduction of the last recorded information is designated, the stored LTN
Although O is the target TNO (A), "99" is set when the disc is a PRD. Next, the servo unit 5 is controlled to start the search by the Tr jump (step S
2). The Tr jump here is a large jump of about 100 tracks and the search is performed. Next, the subcode at the jumped position is read, and if it is read normally, the subcode (B) is stored in the memory (M), and the TNO (B) and the target TNO indicated by the subcode are stored.
(A) is compared (steps S3, S4, S5). If they do not match, repeat from step S2 to the next Tr.
Make a jump. If they match, the search ends,
The cue search of the recording area indicated by the TNO is performed to reproduce the recorded information.

When reading the subcode at the jump position in step S3, if the subcode cannot be read normally, it is determined to be abnormal and stop control of the spindle motor 1 is performed (FIG. 4; step S6). Then, the servo section 5 is controlled to perform a jumpback of a predetermined width to perform the setup operation. If the setup operation cannot be performed, the pickup 2 is further moved to the completion (steps S7 and S8). Jumpback may return to the home position. When the setup is completed, a search is performed by using the position indicated by the subcode of the jump position immediately before the abnormality stored in the memory (M) as a temporary target (step S
9). In this search, control is performed so as not to jump over the temporary target. When the position of the temporary target can be searched, the search by 10Tr jump is started from that position in the search direction of the first target, the number of jumps is counted, and it is determined whether or not the number of jumps exceeds 30 ( Step S
10, S11). If it exceeds 30 times, it is determined that the abnormality is caused by a scratch or vibration of the disc, and the process returns to step S2 to continue the search with a large jump for the first target.

In the 10Tr jump, as in the case of a large jump, the subcode is read at the jumped position, and if read normally, the subcode (C) is compared with the subcode (M) of the memory. If the address of the subcode just read is larger, the memory is rewritten with the subcode just read and the 10Tr jump is repeated (steps S12, S13, S14).

In the reading of the sub-code in the 10Tr jump of step S12, if the subcode is not read normally, it is judged that the mirror surface is abnormal and the 10Tr jump is ended, and the jump position stored immediately before the abnormality is stored in the memory. The TNO shown in the subcode is changed to LTNO (END T
NO) is determined and stored (step S15, 1)
6). As a result, the search process ends, and thereafter, setup is performed to perform a cue search for the LTNO recording area and playback is performed. Although the determination of the number of executions of the 10Tr jump in step S10 is 30 times, this is set so that the total jump track number of the 10Tr jumps exceeds the track number of one large jump in the search. It is not limited to this.

As described above, in this embodiment, even if an abnormality occurs in the reading of the sub-code due to the mirror surface portion of the PRD, the position of the sub-code read immediately before the occurrence of the abnormality is returned, and the minimum information is recorded on the disc from that position. A search is performed by a 10Tr jump that is less than or equal to the number of recorded tracks, and the subcode read immediately before the occurrence of another abnormality due to the mirror surface portion is stored. Therefore, as shown in FIG. TNO = 8) can be reliably detected. Further, even if the abnormal reading of the subcode is caused by a scratch or vibration of the disk, the number of 10Tr jumps is managed so as to prevent erroneous determination as a mirror surface.

[0031]

As described above, according to the recorded information search method of the CD reproducing apparatus of the present invention, the TOC information cannot be read and the CD-R which is the mirror area after the program area is being written. Even in the case of discs, since the last recorded information in the program area can be searched for and detected without any trouble, quick reproduction is possible in the subsequent searches and the reproduction of the disc during the writing of the CD-R is made efficient. Produce an effect.

[Brief description of drawings]

FIG. 1 is a block diagram of a CD reproducing apparatus to which the present invention is applied.

FIG. 2 is an explanatory diagram of a search for last recorded information for a PRD in the embodiment.

FIG. 3 is a flowchart (1) of TNO search processing according to an embodiment of the present invention.

FIG. 4 is a flowchart (2) of the TNO search process following FIG.

FIG. 5 is an explanatory diagram of a CD and a CD-R.

FIG. 6 is an explanatory diagram of a conventional TNO search process.

[Explanation of symbols]

 D ... Disk 1 ... Spindle motor 2 ... Pickup 3 ... Servo mechanism 4 ... Auto power controller (APC) 5 ... Servo unit 6 ... Preamplifier unit 7 ... Decoder unit 8 ... DA converter unit 9 ... Display / operation unit 10 ... System controller Department

 ─────────────────────────────────────────────────── ─── 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 recording information search method for a CD reproducing apparatus, wherein a pickup is moved by a jump for skipping a predetermined number of tracks to search for the last recorded information in a program area, wherein a subcode read at the jump position is recorded. Sequentially store, when a reading error occurs in the search, return the pickup to the jump position before the error occurs, and then perform the search by jumping from that position to a predetermined number of recording tracks of the minimum information or less. A recorded information search method for a CD reproducing apparatus, characterized in that the last recorded information is detected by the subcode read at a jump position immediately before when a read error occurs again.