JP2852007B2 - Optical disc playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk reproducing apparatus for reproducing an optical disk on which a program shorter than the original program is overwritten, and more particularly to an optical disk reproducing apparatus for reproducing an original program generated by overwriting. By jumping over the remaining information, an accurate reproduction of the overwritten program is performed. 2. Description of the Related Art Conventionally, an optical disk in which an audio signal is converted into a digital signal and recorded is used. In this read-only type light, all the music pieces are usually recorded continuously for each music piece.
When the reproduction of the music is completed, the reproduction operation is continued as it is, and the recording of the audio signal is performed so that the reproduction of the next music is continuously performed. [0003] In addition to such a read-only optical disk, there has been proposed an optical disk recording apparatus which enables a user to record an audio signal in a digital signal state. However, in such an optical disk recording apparatus capable of recording an audio signal in the form of a digital signal, not all songs are recorded continuously, and for example, the first song constituting one program is not always recorded. It is conceivable that an unrecorded portion may occur between the second songs constituting another program. In this case, if the reproducing operation is performed continuously,
Until the second song is started after the end of the song, the silent portion is continuously reproduced. [0005] In addition, in the case of so-called overwriting, that is, when another piece of music constituting another program is re-recorded from above a recorded part, the original piece is added after the newly recorded piece. If the song remains, that portion will also be played. Accordingly, the present invention provides a method for re-recording another piece of music constituting another program from above a recorded part, and replacing the original piece of music after the newly recorded piece. It is an object of the present invention to provide an optical disc reproducing apparatus capable of accurately reproducing a newly recorded program of a desired tune by jumping the remaining information of the original tune even if a part remains. In order to achieve the above object, an optical disk reproducing apparatus according to the present invention has an optical disk on which a program shorter than the original program is recorded on top of the original program. Wherein the optical disc is provided with a catalog management area for managing at least a start address and an end address of the short program , and is generated by the overwriting based on the address information recorded in the catalog management area. A search operation for jumping the reproduction of the remaining information of the original program is performed. The optical disk reproducing apparatus according to the present invention, when reproducing an optical disk on which a program shorter than the original program is recorded over the original program, stores the information in a catalog management area provided on the optical disk. Based on the address information of a new program shorter than this program which is overwritten on the recorded original program, the remaining information of the original program caused by the overwriting is jumped. An embodiment of the present invention will be described below in detail with reference to the drawings. First, the disc in this embodiment will be described with reference to FIG. In FIG. 2, a recording disk 1 is, for example, a magneto-optical disk having a diameter of 12 cm and having a perpendicular magnetization film having a magneto-optical effect, and is rotationally driven at a constant linear velocity (CLV). A pre-group 2 having a depth of λ / 8 (where λ is the wavelength of a laser beam) is formed in a spiral shape on the recording disk 1, and land portions between the pre-groups 2 extend in the circumferential direction. An embossed area 4 composed of a concavo-convex pattern of pits 3 and a data recording area 5 on which magneto-optical recording is performed are alternately provided at the same pitch. The depth of the pit 3 is λ / 4. FIG. 3 shows the structure of one frame defined by the format of a compact disc. One frame is composed of 588 channel bits, and is composed of data after EFM (Eight to Fourteen Modulation) modulation. That is, one frame is composed of a 24-bit frame synchronization signal, a 14-bit (one symbol) subcode, and a 14 × 32-bit (3
(2 symbols) of performance data and parity. However, because of the combination of each symbol, 3
Merging bits are provided for each bit, for a total of 588 bits. The frame synchronizing signal and the subcode of the data constituting one frame are recorded in advance in the embossed area 4 as an uneven pattern, and data such as performance information and parity are recorded in the data recording area 5 in a magneto-optical manner. It can be recorded as a record.
As will be described later, the subcode prerecorded in the emboss area 4 is only the Q channel, and furthermore, only the absolute address information which is the absolute time information from the start to the end of the performance area. In the lead-in portion on the inner circumference of the performance area of the recording disk 1, it is possible to record at least pieces of information including a song number corresponding to each song, a start address indicating a start time, and an end address indicating an end time. A TOC (Table of Contents) unit 6 is provided as a simple inventory management area. Magneto-optical recording is, of course, performed on the TOC section 6. Also, an embossed area 4 composed of the above-mentioned concavo-convex pattern is provided in the lead-in part except the TOC part 6, and the CLV servo for rotating the recording disk 1 at a constant linear velocity is started from the lead-in part. It is possible. This CLV servo will be described later in detail. Next, an example of the configuration of the concavo-convex pattern in the emboss region 4 will be described with reference to FIG.
As described above, the portion of the frame synchronization signal and the subcode, that is, 41 bits, is recorded as the concavo-convex pattern in the emboss area. However, this includes three merging bits. The 1st to 24th bits are a frame synchronization signal, and are 11T-11T-2T according to the format of the compact disc.
Is formed by the concave and convex pattern. Note that T is one cycle of channel lock (4.32 MHz). Also,
The 25th to 27th bits are merging bits, and the 28th to 41st bits are subcodes. Here, the subcode to be recorded is only the Q channel, and further, is only the absolute time information from the beginning to the end of the performance area. To be precise, although 14 bits are recorded as a subcode, only the Q channel is desired to be recorded as information, and further, only absolute time information is recorded. The absolute time information includes minute (AMIN), second (ASEC), and frame (AFRAM).
E). The falling portion at the front end of the embossed area is detected by an optical pickup or the like, and the detection output is used to detect the CLV servo or PL for rotating the disk at a constant linear velocity.
Used for phase comparison of the L circuit. Since the CLV servo is performed based on the detection of the falling portion, highly reliable and highly accurate servo can be performed. As described above, since the falling portion is very important, the head portion of the frame synchronization signal corresponding to the first bit of the emboss area must always be a pit. Therefore, according to the format of the compact disk, a concavo-convex pattern reverse to that shown in the drawing can be considered.
If a pattern of T-2T is used, as shown in the figure,
The pattern must start with a pit. The three merging bits after the subcode are always lands. This is because the land part (merging bit)
When the end of a pit enters the pit, the effect of the merging bit is absorbed to prevent intersymbol interference in a data recording area where subsequent magneto-optical recording is performed. Also, depending on the format of the compact disc,
Since the pit portion and the land portion are respectively defined as 3T to 11T, when a pit exists at the end of the emboss area, it is necessary to set the shortest to 3T. Further, the merging bits between the frame synchronization signal and the subcode are determined in consideration of the above-mentioned rules of 3T to 11T. Since only the Q channel is required for the subcode, specifically, patterns corresponding to Q = 0 and Q = 1 can be selected one by one from 128 patterns. . Thereby, the clock (bit clock) component having the largest component can be selected. As an example, as shown in FIG. 5 (A) to FIG.
All of the embossed regions can be constituted by only the same patterns. That is, the block synchronizing signals S0 and S1 of the subcode are formed by the concavo-convex pattern as shown in FIGS. 5A and 5B, respectively. Also, Q
When Q = 0, it is constituted by an uneven pattern as shown in FIG. 5 (C), and when Q = 1, it is constituted by an uneven pattern as shown in FIG. 5 (D). Q = 0 and Q
= 1 3T so that the clock component is maximized.
A repeating pattern is used. The pattern of the frame synchronization signal is, of course, shared. Further, if it is possible to determine that the frame synchronization signal is a frame synchronization signal from the falling portion at the front end of the embossed area, the frame synchronization signal does not need to be a pattern of 11T-11T-2T, but a 3T repetition. It can be a pattern. As an example, a pattern when Q = 0 shown in FIG. 5 (C) is shown in FIG. 5 (C ′). This can further increase the clock component,
This is advantageous for clock recovery and facilitates the configuration of a PLL circuit for bit demodulation. However, in this case, when a 3T repetitive pattern is detected, it is necessary to convert it to an 11T-11T-2T pattern and input it to the EFM decoder. It should be noted that in FIG. 5 (C) and FIG. 5 (C ′),
It goes without saying that the patterns of the merging bits are different. Next, the configuration of a disk recording / reproducing apparatus for recording and reproducing an audio signal using the recording disk 1 will be described with reference to FIG. In FIG. 1, a recording disk 1 is rotationally driven by a motor 11 at a constant linear velocity. The optical head 12 is composed of a laser diode, a photodetector, and optical components such as a lens and a half mirror, and records and reproduces information signals including audio signals by irradiating the recording disk 1 with a light beam. Further, a magnet 13 for applying an external magnetic field is provided opposite the optical head 12 with the recording disk 1 interposed therebetween. The magnet 13 is controlled so that the direction of the magnetic pole is inverted between the time of erasing the information signal and the time of recording the information signal. RF read by optical head 12
The signal corresponding to the emboss area 4 among the signals is sent to the emboss reproduction amplifier 14. Further, signals corresponding to the TOC section 6 and the data recording area 5 where the magneto-optical recording is performed are sent to the MO reproducing amplifier 15. The absolute address information as the absolute time information from the emboss reproduction amplifier 14 is decoded by the decoder 16 and then sent to the microcomputer 17. On the other hand, the output from the MO reproduction amplifier 15 is sent to a reproduction signal processing circuit 18 where predetermined signal processing is performed. Then, the information recorded in the TOC section 6, that is, the information of the music number, start time, and end time corresponding to each music, is sent from the reproduction signal processing circuit 18 to the buffer memory 19 as a storage element. The above information is written to the buffer memory 19 when the disc 1 is mounted. Also, the performance information recorded in the data recording area 5 from the reproduction signal processing circuit 18 is sent to a D / A converter (digital / analog converter) 20 and is converted into an analog amount. From the terminal 22 as a reproduced audio signal S _O. On the other hand, at the time of recording, an audio signal S _I to be recorded is supplied to the terminal 23. This signal S _I is sent to an A / D converter (analog / digital converter) 25 via a buffer amplifier 24 and is converted into a digital quantity. The performance information from the A / D converter 25 is sent to a recording signal processing circuit 26, subjected to predetermined signal processing, and then sent to the optical head 12 via a recording amplifier 27 to be recorded in the data recording area 5 of the disk 1. It is supposed to be. At the time of recording, the output from the A / D converter 25 is also sent to the microcomputer 17, and the presence or absence of a signal, that is, the detection of a silent portion between music pieces is automatically performed. Based on the detection result of this silent part,
Each information of the music number, the start time as the start address of this music, and the end time as the end address is stored in the buffer memory 1.
9 is written. The above-mentioned information can be written into the buffer memory 19 manually using the operation keys 28. The display 29 shows a song number, a start time,
The end time and the like are displayed, and the length of the recordable unrecorded portion on the recording disk 1, that is, the remaining time and the like are displayed prior to the recording (recording) operation. Further, in the present embodiment, the microcomputer 1 is used immediately before the recording disk 1 is taken out of the apparatus.
7, the music number information stored in the buffer memory 19 is sorted, and each piece of information from the buffer memory 19 is sent to the optical head 12 via the recording signal processing circuit 26 and the recording amplifier 27, and the disk 1 Is recorded in the TOC unit 6 of the. It should be noted that the absolute time information from the embossed area 4 of the recording disk 1 is supplied to the microcomputer 17 even during recording. Next, an example of a normal recording operation will be described with reference to a flowchart shown in FIG. First, when the recording disk 1 is loaded, information recorded in the TOC section 6 of the recording disk 1 is copied to the buffer memory 19 (steps 101 and 102). Next, information on the song number of the first song and information on the start time are written into the buffer memory 19 (step 1).
03), a recording operation is started (step 104). Next, it is detected whether or not there is a silent portion for three seconds or more (step 105). This step 105 is repeatedly executed until a silent portion of 3 seconds or more is detected. However, when it is detected, the first absolute time information of the silent portion +
One second is set as the end time of the first music, and this information is written to the buffer memory 19 (step 106). Next, the last absolute time information of the silence portion—one second—is set as the start time of the second tune, and is written into the buffer memory 19 together with the information of the tune number of the second tune (step 107). Done in Next, as in step 105,
It is detected whether or not there is a silent portion for three seconds or more (step 108). Hereinafter, the same processing as that for the first music piece is performed for the second and subsequent music pieces. When the recording is completed (step 109), the music numbers stored in the buffer memory 19 are sorted out (step 11).
0). Here, the arrangement of the music numbers means eliminating the duplication of the music numbers when the music numbers are over-recorded on the already-recorded disc, or deleting the music before the head lacking from the registration.
The music numbers are sorted in ascending order of the absolute time information of the recorded portion. After the song numbers are arranged, the information in the buffer memory 19 is stored in the TO
This is recorded in the C section 6 (step 11).
1). Next, an example of the operation at the time of normal reproduction will be described in the seventh section.
This will be described with reference to the flowchart in FIG. First, when the disc 1 is loaded, information recorded in the TOC unit 6 of the disc 1 is copied to the buffer memory 19. (Step 201, Step 202). Next, a search is performed at the position of the start time of the first music (step 203), and the reproducing operation is started (step 204). Next, it is detected whether or not the current absolute time information matches the information of the end time of the first music (step 205). Until a match is detected, this step 205 is repeatedly executed, but when it is detected, it is determined whether or not the difference between the start time of the second music and the end time of the first music exceeds 3 seconds. (Step 206). If it exceeds 3 seconds, a search is performed at the start time position of the second music (step 20).
7) If the time does not exceed 3 seconds, the second tune is reproduced continuously without a search. Next, it is detected whether or not the current absolute time information matches the information on the end time of the second music (step 208). Hereinafter, the same processing as that for the first music piece is performed for the second and subsequent music pieces.
Specifically, for example, the following effects can be obtained. Current,
The disk 1 has a pattern 4 as shown in FIG.
It is assumed that a song is recorded. There is an unrecorded portion between the second and third songs, and the original song remains between the fourth and fourth songs as a result of the third song being overwritten. In the figure, "S" indicates the start time (start point) of the music, and "E"
Indicates the end time (end point) of the music. According to the above-described optical disk recording / reproducing apparatus, even if the disk is recorded in such a pattern, as shown in FIG. 8 (B), as if an unrecorded part or a remaining part of the original music existed. It is possible to continuously reproduce the first to fourth tunes as if they did not. This is achieved, of course, by performing an operation of performing a high-speed search for the start time position of the next song by jumping the unrecorded portion or the remaining portion of the previous song. That is, in the optical disk recording / reproducing apparatus shown in FIG. 1, the optical head 12 jumps over the recording track of the unrecorded portion or the remaining portion of the previous song, and performs a high-speed search for searching the start time position of the next song. Is controlled as follows. Although not shown in the flow chart of FIG. 6, the optical disc recording / reproducing apparatus shown in FIG. 1 performs the recording (recording) of the recordable unrecorded portion on the recording disc 1 prior to the recording (recording) operation. Display length 2 (remaining time)
9 and is configured so that a high-speed search is performed up to the position of the head of the unrecorded portion, and the unrecorded portion can be found quickly without any trouble, and the efficiency is high.
If there are many unrecorded parts,
More complex controls are required, but for the simplest,
The largest one of the recorded end time information may be the start of the unrecorded part. As described above, the optical disk reproducing apparatus according to the present invention, when reproducing an optical disk on which a program shorter than the original program is recorded over the original program, reproduces the information on this optical disk. Based on the address information of a new program shorter than the original program recorded over the original program recorded in the provided inventory management area, the remaining information of the original program generated by the overwrite is jumped and reproduced. Therefore, even if a part of the original program remains after the newly recorded program, the reproduction is performed by jumping the remaining information, so that the newly recorded desired program can be accurately reproduced. it can. Accordingly, it is possible to provide an optical disk reproducing apparatus capable of accurately reproducing a program recorded on an optical disk on which an audio signal is overwritten.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block circuit diagram showing an embodiment of an optical disk recording / reproducing apparatus to which the present invention is applied. FIG. 2 is an enlarged schematic view showing an optical disk used in the optical disk recording and reproducing apparatus shown in FIG. 1 and a part of a performance area thereof; FIG. 3 is a diagram showing a configuration of data recorded in an emboss area and a data recording area. FIG. 4 is a diagram illustrating a configuration example of a concavo-convex pattern in an embossed region. 5 is a diagram showing a specific configuration example of the concavo-convex pattern shown in FIG. FIG. 6 is a flowchart illustrating an example of an operation when recording a normal audio signal. FIG. 7 is a flowchart illustrating an example of an operation during normal reproduction. FIG. 8 is a schematic diagram for specifically explaining a state in which an optical disk on which an audio signal is recorded is reproduced by the optical disk recording / reproducing apparatus according to the present invention. [Description of Signs] 1 recording disk 3 pit 4 embossed area 5 data recording area 6 TOC section 12 optical head 13 magnet 17 for applying external magnetic field 17 microcomputer 19 buffer memory

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Kazuhiko Fujiya               6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo So               Knee Co., Ltd.                (56) References JP-A-57-3243 (JP, A)                 JP-A-61-34772 (JP, A)                 JP-A-58-114381 (JP, A)

Claims (1)

(57) [Claims] An optical disc reproducing apparatus for reproducing an optical disc on which a program shorter than the original program is recorded over the original program, wherein the optical disc is provided with a catalog management area for managing at least a start end address and an end address of the short program. An optical disc reproducing apparatus for performing a search operation for jumping reproduction of information remaining in the original program generated by the overwriting based on the address information recorded in the inventory management area.