JP3101049B2 - Read-only CD player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CD (Compact Disk)
In connection with the playback device, especially a recordable CD-R (CD Rec
The present invention relates to a CD reproducing apparatus capable of reproducing a disc in the middle of writing (ordable).

[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 Figure 3
As shown in (1), from the inner periphery of the disc, a lead-in (Lead IN) area in which index information of recording information is recorded, a program area in which actual music information and the like are recorded, and an end of the program area Indicates a readout (Le
ad OUT) areas are sequentially formed. The signal to be recorded is a digital signal modulated by EFM (Eight to Fourteen Modulation), and includes a subcode such as a time code (time information) in addition to a main code (main information) such as music information. I have. Index information called TOC (Table Of Contents) is recorded in the lead-in area, and the total number of pieces of recording information (for example, the total number of songs) recorded in the program area of the disc, and the total recording time (for example, the total playing time) ) Are recorded as subcodes.
In the program area, music information and the like as a main code are recorded, and in the Q channel of the subcode, a track number (TNO) indicating a recording information piece number (for example, a song number), a recording time from the start of the track (TNO) P-TIM
E: for example, the playing time of the music, and the total recording time (A-TIME: for example, total playing time) measured from track number = 1. In the lead-out area,
A lead-out code indicating a lead-out area is recorded.

In the conventional CD reproducing apparatus for reproducing 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 information can be read. The setup is performed, and when the setup is completed, the TOC information is read from the lead-in area. In the reading of the TOC information, there is a case where the TOC information cannot be obtained due to a scratch on the disk or the like. At that time, the information of the program area is reproduced without the TOC information. For this reason, conventionally, according to the result of reading the TOC information, the discrimination is made between "normal CD with TOC" and "normal CD without TOC", and the information is stored as disc discrimination information.

[0004] FIG. 4 shows the TO in a conventional CD reproducing apparatus.
5 shows a flowchart of a process of reading C information. Conventionally, as shown in the flowchart, the lead-in area is searched first, and a search is attempted for a predetermined time until the lead-in area is detected (steps S51, S52, S53). Then, when the time is over, the lead-in area cannot be detected, that is, the TOC information cannot be read, so that it is determined as "normal CD without TOC" and the information is stored. When the lead-in area has been detected, the TOC information is read out until the reading is completed or the reading time expires (steps S54, S55, S56). Then, when the reading has timed out, that is, when the TOC information cannot be read, “Normal CD without TOC”
Is determined and stored (step S57), and when reading is completed, it is determined and stored as "normal CD with TOC" (step S58). The disc discrimination information thus discriminated and stored is used in the subsequent processing such as information search.

A CD having the above-described recording format is a read-only recording medium. In recent years, a CD-R has been developed in which information can be additionally recorded while adopting the same format as the CD.

[0006] The recording format standard of this CD-R is unified to a standard called "Orange Book" and conforms to the CD format standard (commonly called Red Book). This CD-R disc is shown in FIGS.
As shown in the figure, the recording state is divided into three types. That is: a blank disc in which information has not yet been recorded and is in an unrecorded state; a partially-recorded disc on which information is partially written (partially recorded disc)
c; hereinafter referred to as “PRD”),: complete recording and C
D, which has been finalized to have almost the same format as D.
c). As shown in the drawing, the lead-in area, the program area, and the lead-out area are finally formatted in the CD-R as in the case of the CD.

A guide groove is formed in a recording track of a CD-R, and the guide groove transmits a carrier wave to data indicating absolute time information (ATIP: Absolute Time In Pregroov).
Wobbling (meandering) by the frequency modulated in e)
Have been. In a CD-R recording / reproducing apparatus, recording and reproduction are performed on a blank disk or a PRD in the middle of writing by performing tracking and spindle control using the guide grooves. As shown in FIG. 4 (2), the PRD further includes a PMA (Program Memory A) on a further inner periphery of the lead-in area I as a temporary TOC area for storing a record history of record information.
rea) is provided. The following three types of information are recorded in this PMA. The first is the start address, end address, and the like of the recording information recorded in the program area, and these 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), which can record six-digit (six digits) numerical information for disc identification as needed. Third is skip command information and skip release information, which are information that can be skipped for each track or a part of a track (time can be specified) during disc playback. In the PRD, such information is recorded as a temporary TOC because information may be additionally recorded in the remaining program area in the PRD. T
This is because OC 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 in the lead-in area I and the TO
The C information is recorded as a subcode, and predetermined information indicating the area is also recorded as a subcode in the lead-out area O. As a result, in the conventional CD reproducing apparatus, it is possible to reproduce the finalized CD-R.

[0009]

Although such a recordable CD-R has been developed and used, a conventional CD-R has been developed.
In the playback device, the finalized CD-R
Although the PRD can be reproduced, the PRD does not allow the reproduction of the information even though the reproducible information is stored in the program area.
This is because, as described above, the TOD is recorded on the PMA provided on the inner peripheral side of the lead-in area in the PRD, but a conventional CD reproducing apparatus has a mechanism for accessing the PMA. I didn't. Also,
The lead-in area and the lead-out area are also mirror-finished, and in the conventional CD reproducing apparatus, read control has not been made, for example, the servo system runs out of control when reading the area.

Therefore, in order to expand the range of use of the CD-R, it has been necessary to develop a CD reproducing apparatus capable of reproducing the program area only by a control change in correspondence with the PRD. When trying to play back PRD in a conventional CD playback device, the read-only CD and PRD have different disk formats as described above.
Naturally, reproduction cannot be performed by the same control method, and different control is required. For this reason, the "TO"
In disc determination of only "no C" and "with TOC", P
The RD was determined to be a "normal CD without TOC", and was not sufficient for reproducing the PRD program area.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a CD reproducing apparatus capable of discriminating a PRD which is a write-once CD-R disc in the middle of writing and performing reproduction control. And

[0012]

[MEANS FOR SOLVING THE PROBLEMS]
The invention according to claim 1 detects a lead-in area.
Attempt to play based on the result and reading result of TOC information
Is a read-only CD or a recordable CD
Disc and play the disc based on the discrimination result.
Can play both a read-only CD and a recordable CD
Attempt to play on a possible read-only CD player
When it is detected that the lead-in area of the disc is a mirror surface , or that the lead-in area is undetectable and the TOC information is unreadable .
When the disc to be played is being written
Disc that can be added to the
Detected that the lead-in area of the disc was detectable
Or detects that the TOC information is readable
The disc to be played is a read-only
A disk discriminating means for discriminating the disc is provided.

[0013]

In the CD reproducing apparatus of the present invention, for example, when the lead-in area is detected and the control of reading the TOC information is performed after the setup, it is determined whether or not the lead-in area has been detected. At the same time, in the lead-in area detection control, whether or not the lead-in area is a mirror surface is detected by a predetermined determination. When a mirror surface is detected in the lead-in area detection control, the disc discriminating means discriminates the disc to be reproduced as a recordable disc. Also, when the lead-in area cannot be detected within a predetermined time, and when the TOC information reading control is performed and the TOC information cannot be read, the disc to be reproduced is determined to be a recordable disc. Thus, for example, when it is determined that the disc is a recordable disc in the disc reproduction, the disc can be reproduced by the control corresponding to the disc.

[0014]

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

As shown in FIG. 1, the CD reproducing apparatus comprises a spindle motor 1 for rotating and driving a disk D, and a pickup for irradiating a pit on the disk D with a laser spot and photoelectrically converting the reflected light to reproduce an RF signal. 2, a servo mechanism 3 for moving the pickup 2 in the radial direction of the disk D and positioning it on the information track;
Auto power to keep laser light output constant
A controller (APC) 4, a servo unit 5 that servo-controls the spindle motor 1, the pickup 2, and the servo mechanism 3, and a preamplifier that amplifies an RF signal reproduced from the pickup 2 and generates a servo control signal to the servo unit 5. Unit 6 and the RF signal amplified by the preamplifier unit 6 is converted to EFM (Eight to Fourteen Modulation).
A decoder unit 7 that performs signal processing such as demodulation and error correction to reproduce audio data, reproduces control data from the sub-coating, and generates a servo control signal of a spindle servo. A D / A converter unit 8 for D / A converting data to generate an audio output, a display / operation unit 9 for displaying an operation state and the like and inputting an operation instruction, a microprocessor, a memory, etc. And a system controller unit 10 for controlling.

When the disk D is set, the system controller 10 first drives the servo mechanism 3 via the servo unit 5 to move the pickup 2 to the home position set near the innermost periphery of the program area. . Next, the spindle motor 1 is driven to turn on each servo in order to perform a setup for controlling to a state where information can be reproduced. In this setup, the position of the playback disk corresponding to the position of the home position is damaged,
If the mirror surface is D, the setup may not be possible. In this case, the pickup 2 is moved from the home position to the outer peripheral side to perform setup again, and control is performed so that information on the innermost periphery of the program area can be reproduced.

When the setup is completed, next, a reading process of the TOC information is performed. The processing for reading the TOC information includes the processing as the disc determination means of the present invention.
That is, according to the result of the TOC information reading process, “T
A CD that is either a "normal CD with OC", a "normal CD without TOC", or a recordable disc
Determine whether the disc is "PRD" indicating a disc in the middle of writing and store it as disc discrimination information. Thereafter, when reproducing the recorded information in the program area by the operation input from the display / operation unit 9, the processing control corresponding to the disc identification information is performed.

FIG. 2 shows a flowchart of a TOC information reading process (TOC read) including the disk discriminating means of the present invention. According to the flowchart, the TOC of this embodiment is used.
Describing the read processing, first, a search for a lead-in area is performed (step S1). At this time, the playback disc D
If PRD is a PRD, the lead-in area is a mirror surface, so that the pickup 2 moves to the mirror surface and servo cannot be performed, and the servo system runs away. At this time, when the system controller unit 10 detects that the servo system has run out of control from the servo unit 5, the system controller unit 10 stops the spindle motor 1, performs the setup, and searches the lead-in area again. In the present embodiment, if the servo system runs out of control three times as a result of the search for the lead-in area, it is determined that the lead-in area is a PRD having a mirror surface, and "P
RD "is stored and set (step S2). In this case, in the mirror surface detection in this case, when the servo system runs out of control three times, it is determined that the mirror surface is detected. However, the number of times of this determination is determined in consideration of a case due to a scratch or vibration. What is necessary is just to be able to determine that it is a mirror surface.

Even if the playback disk D is a PRD and the lead-in area is a mirror surface, if the pickup 2 is to perform track king control with a three spot beam, the pickup 2 does not move to the mirror surface portion, so the servo system is not used. Does not run away. However, even in this case, time over occurs because the lead-in area cannot be searched. If the lead-in area cannot be detected due to scratches or the like even in a normal CD, time over occurs again (steps S3 and S4). If the lead-in area cannot be detected and the time is over, another attempt is made to read the TOC data (step S5). In the case of PRD, TOC data cannot be read, so that a time over occurs. Therefore, in this case, it is determined that the disc is a PRD, and "PRD" is stored and set as disc discrimination information (Step S).
6, S7, S8). If the reading of the TOC data is possible and the operation is completed, it is determined that the CD is a normal CD capable of reading the TOC data, and "normal CD with TOC" is stored and set as disc determination information (step S9).

When the lead-in area is detected, the process proceeds to the TOC data reading process as in the prior art.
When the reading is completed, "Normal C with TOC"
D ", and when the reading has timed out, it is determined to be" Normal CD without TOC "and stored as disc discrimination information in each case (steps S10, S11, S12, S13).

Table 1 shows a correspondence table between the above-described disc determination conditions and results. As shown in Table 1, in the disc discrimination of this embodiment, a normal CD is discriminated, and when a mirror surface is detected in the detection of the lead-in area, or when the lead-in area cannot be detected and the TOC information cannot be read. Then, each playback disc is determined to be a PRD and stored and set. This allows
In the subsequent playback control, control corresponding to the playback disc can be performed with reference to the disc discrimination information, and even a PRD having no TOC information and a mirror-in lead-in area is recorded in its program area. Information can be reproduced.

[0022]

[Table 1]

[0023]

As described above, according to the CD reproducing apparatus of the present invention, it is possible to discriminate a recordable disc, so that in the subsequent reproduction control, control corresponding to the disc can be performed, and additional recording is possible. This makes it possible to reproduce the recorded information of a simple disc.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a T including a disk discriminating means according to an embodiment of the present invention;
It is a process flowchart of OC read.

FIG. 3 is an explanatory diagram of a CD and a CD-R.

FIG. 4 is a flowchart of a conventional disc determination 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

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiro Aoyagi 25-1, Nishimachi, Yamada-ji, Kawaji-shi, Saitama Prefecture Pioneer Corporation Inside the Kawagoe Plant (72) Hiroyuki Abe 25-1, Nishimachi, Yamada-ji, Kawaji-shi, Saitama Pioneer Inside the Kawagoe Plant Co., Ltd. (72) Alex Bradshaw, inventor 25-1, Nishimachi, Yamada, Kawaji-shi, Saitama Pioneer Inside the Kawagoe Plant (72) Inventor Kazuhiro Kiyoura 25-1, Nishimachi, Yamada, Kawagoe, Saitama Pioneer Inside the Kawagoe Plant Co., Ltd. (72) Inventor Kiyoshi Kato 25-1, Nishimachi, Yamada-ji, Kawaji-shi, Saitama Prefecture Pioneer Corporation Inside the Kawagoe Plant (72) Koichiro Haraguchi 25-1, Nishimachi, Yamada-ji, Kawagoe-shi, Saitama Pioneer Corporation Kawagoe Factory (56) References JP-A-5-174386 (JP A) JP-A-5-159307 (JP, A) JP-A-4-106758 (JP, A) JP-A-4-1888464 (JP, A) JP-A-5-27813 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) G11B ^7/ 00-7/013 G11B 19/02 501 G11B 19/12 501 G11B 27/10

Claims (1)

(57) [Claims] 1. A disc to be reproduced is reproduced according to a detection result of a lead-in area and a reading result of TOC information.
Determine whether the CD is a raw CD or a recordable CD.
Playback-only C that plays the disc based on the determination result of
In a read-only CD playback device that can play back both D and a recordable CD, the lead-in area of the disk to be played back is a mirror surface.
When it is detected, or yet TOC information the lead-in area is an undetectable is in the unreadable that there
That the disc to be played is
Is a write-once CD that is being written, and the lead-in area of the disc to be played can be detected.
Is detected or TOC information is read
If it detects that it is acceptable, it will try to play it
Disc that determines that the disc is a read-only disc
A reproduction-only CD reproduction apparatus , comprising: a determination unit .