JPH06105536B2 - Disc recording / reproducing device - Google Patents

Description

The present invention relates to a disc recording / reproducing apparatus capable of recording and reproducing, for example, music information on a recordable disc having absolute address information. is there.

[Conventional technology]

2. Description of the Related Art Conventionally, there is known a so-called compact disc (hereinafter referred to as a CD), which is a read-only disc in which music information and the like are converted into digital signals and recorded on a disc-shaped recording medium. An information area called TOC (Table Of Contents) where several songs are recorded continuously on the CD and the recording start position of each song is recorded in the lead-in area of the innermost circumference. Is set. When the CD is loaded into the playback device and played back, the TOC information in the TOC area is first played, and the number of songs recorded on the filled CD and the recording start time (position) of each song are recorded. In the subsequent playback, the TOC information can be used to access any song in a short time.

By the way, since the above-mentioned CD is exclusively for reproduction, it is desired to develop a recording / reproducing apparatus which can satisfy such a requirement because the user cannot freely record his / her favorite music. As an example thereof, a recording / reproducing device using a rewritable magneto-optical disk can be considered. Regarding the recording method in this case, the absolute address information that is formed on the disc in the form of a concave-convex pattern or groove wobbling in order to perform constant linear velocity (CLV) control of the disc that is implemented on a CD. It is proposed that the disk be pre-formatted when the disk is formed, and that the recording / reproducing apparatus uses the absolute address information to access the unrecorded portion and CLV control to record the data in the same signal format as the CD. There is. Also regarding the above TOC information, at the time when the recording of the music information etc. is finished, the absolute address information at which the recording is started and the absolute address position at which the recording is finished are made to correspond to the song numbers,
It may be possible to rewrite the TOC information.

Here, if the user can freely record his or her favorite song, etc., there may be a request to keep important songs that he / she likes particularly forever. On the other hand, it is possible to apply write protection to each disk.

[Problems to be Solved by the Invention]

However, if write protection is applied to each disc, write protection is uniformly applied to all recorded information in the disc, and write protection cannot be individually applied to each song. For this reason, it is not possible to erase or rewrite only unnecessary songs while leaving useful songs in one disc, and the advantages of the rewritable disc cannot be fully exerted. Such a drawback is the same not only when the information is the above-mentioned music (music information) but also when it is normal data or the like. Therefore, in a disc recording / reproducing apparatus using a rewritable disc, for example, a configuration capable of individually performing write protection for each song is desired.

In addition, for example, in a configuration in which write protection is possible for each song, when a new song is recorded in the non-write protected area, the capacity of the non-write protected area is larger than the capacity required for recording this song. May be small. In the case of reproducing when such recording is performed, the performance of the newly recorded song ends midway, and at the same time as this end, the performance of the recorded song in the write protect area starts, which may lead to a feeling that the song is cut off. This makes the listener uncomfortable. Therefore, the above-mentioned disc recording / reproducing apparatus is desired to have a configuration capable of further solving this problem.

[Means for Solving the Problems]

In order to solve the above problems, a disc recording / reproducing apparatus of the present invention has a recording area having absolute address information, a program area for recording the recording information, and a TOC area for recording additional information of the recording information. In a disc recording / reproducing apparatus using a rewritable disc having a memory, an operation key operated by a user, a memory unit for storing individual write protect information for predetermined recorded information input by the operation key, and this memory TOC with the contents stored in the method as additional information
Recording means for re-recording in the area, control means for blocking writing to the write protect area, and capacity of the record information when the record information is recorded in the non-write protect area And a fade-out processing unit for adding fade-out processing to the recorded information before the end of the non-write protect area.

[Action]

According to the above configuration, since write protection can be performed for each information, it is possible to erase or rewrite only the useless information while leaving the useful information. Furthermore, since fade-out processing is added to the recorded information before the end of the non-write protect area, for example, when the above recorded information is a song, when this is played, the sound gradually becomes smaller before the end of the song, causing a feeling of cut-out. Without ending the song. Therefore, the listener does not feel uncomfortable.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. In this embodiment, a magneto-optical disk is used as a rewritable disk, and recording and reproduction of music information and the like in a data format standardized in so-called CD are performed.

First, a basic disc recording / reproducing apparatus having a configuration capable of individually performing write protection for each song will be described. As shown in FIG. 2, on the magneto-optical disk 1 used in this disk recording / reproducing apparatus, a spiral track 21 and absolute address information 22 ... Are recorded in advance in at least a recording area to be recorded / reproduced. Has been done. Such a recording area is divided into an outer peripheral side area and an inner peripheral side area, the outer peripheral side area constitutes a program area 24 for recording and reproducing a program such as music information (recording information) by a user, and the inner peripheral side area is at least The song number of each of the music information and the like, the recording start position and the recording end position, or the length (additional information) from the recording start position to the recording end position is recorded in correspondence with the absolute address information 22 ... It constitutes the TOC area 23. TOC area 23 and program area 24
The same data format as the CD is used as the recording data format. That is, as shown in FIG. 3, for each data field d in which 8 bytes of parity for error detection and correction is added to the data of 24 bytes of music information and the like, a subcode c and a frame indicating the song number and time information and the like. A frame a formed by adding a frame synchronization signal b indicating the beginning of the is sequentially recorded.

As for each of the absolute address information 22 described above, as shown in FIG. 4, a preamble e for reproducing synchronization, an address mark f indicating the beginning of the absolute address information, and absolute address information sequentially from the innermost circumference side. Information consisting of an address number g indicating an incremented address (actually also an absolute time of one second unit) and an error detection code h for checking an error when recognizing the address number is obtained at a predetermined linear velocity. Pre-recorded in a concavo-convex pattern so that reproduction can be performed once per second.

On the other hand, in the disk recording / reproducing device on the driver side, as shown in FIG. 1, the magneto-optical disk 1 is rotationally driven by a spindle motor 2. The optical head 3 irradiates the magneto-optical disk 1 with a laser beam to record / reproduce information, and the concave / convex signal component forming the absolute address information 22 ... Of the signal reproduced by the optical head 3 is a concave / convex signal reproducing amplifier 4 It is designed to be amplified by. The address decoder 5 which receives the signal from the uneven signal reproducing amplifier 4 recognizes the address value from this signal and outputs it to the controller 6. The controller 6 not only controls the entire disk recording / reproducing apparatus but also functions as a control means described later. A rotary encoder 7 is connected to the spindle motor 2 to output a predetermined number of pulses per rotation according to the rotation of the spindle motor 2. The pulses from the rotary encoder 7 are output to a CLV control circuit 8. There is. The CLV control circuit 8 determines the spindle motor 2 based on the above pulse and the disk radius position information output from the controller 6.
Is controlled to rotate at a constant linear velocity.

Further, the reproduction amplifier 9 connected to the optical head 3 amplifies a magneto-optical signal component corresponding to music information or the like in the signal reproduced by the optical head 3. The reproduction signal processing circuit 10 connected to the reproduction amplifier 9 is
The reproduction data such as music information according to the above data format is processed, necessary data is extracted and aligned, and error correction processing is performed as necessary. The TOC memory (memory means) 11 stores the contents of the TOC area 23 among the signals processed by the reproduction signal processing circuit 10 and sequentially stores information specified by the user (specified by the operation keys 13 described later). You can do it. A display 12 is connected to the controller 6, and the display 12 displays song numbers, time information, and write protect information of each song corresponding to the contents of the TOC memory 11. An operation key 13 is connected to the controller 6, and the operation key 13
Allows the user to make various designations.

The controller 6 also serves as a control unit that controls to block the write command to the write protect area when there is a write command in the information record command from the user. As a means for preventing recording, the control of the drive of the optical head 3 (emission of a CD-like light beam having a relatively large output required for recording) and the control for shifting to a routine for information recording in the controller 6 is performed. There is a method of returning to the routine waiting for key input.

D / A converter 1 connected to the reproduction signal processing circuit 10
By 4, the digital audio data string from the reproduction signal processing circuit 10 is converted into an analog signal, and this analog signal is output to the outside (Sout).

Analog signal from outside (Sin) such as music information is A / D
It is converted into a digital signal by the converter 15, and this signal is output to the recording signal processing circuit 16. Recording signal processing circuit 16
Performs a process of converting the digital audio data string from the A / D converter 15 or the TOC information from the TOC memory 11 into a recording data string corresponding to the above data format. The coil driver 17 drives the magnetic coil 18 according to the recording signal from the recording signal processing circuit 16. The magnetic coil 18 applies an external magnetic field corresponding to a recording signal to the magneto-optical disk 1. By the recording signal processing circuit 16, the coil driver 17, and the magnetic coil 18, the contents stored in the TOC memory 11 are used as additional information in the TOC area 23.
A recording means for re-recording is configured.

Here, the control for keeping the linear velocity of the magneto-optical disk 1 constant will be described. When the magneto-optical disk 1 is loaded on the spindle motor 2, the controller 6 controls an optical head moving mechanism (not shown) to move the optical head 3 to a radial position corresponding to the TOC area 23, and causes the CLV control circuit 8 to operate. On the other hand, the disk radial position information corresponding to the above radial position is supplied. CL
The V control circuit 8 obtains the necessary number of revolutions necessary to achieve a predetermined linear velocity based on the disc radial position information given from the controller 6, and obtains the pulse frequency reference value of the rotary encoder 7 corresponding to the number of revolutions, The magneto-optical disk 1 is rotationally driven at a required linear velocity by controlling the actual output pulse frequency of the rotary encoder 7 to be the same as the pulse frequency reference value. Then, the optical head 3 outputs absolute address information as a reproduction signal, which is amplified by the concavo-convex signal reproduction amplifier 4 and then the address decoder 5 recognizes the absolute address information and inputs it to the controller 6. Regarding the rotation control up to this point, the disk radial position information does not always match the actual position in consideration of variations in mechanical accuracy, and thus the accurate predetermined linear velocity is not obtained. At this stage, at least absolute address information is allowed as long as it is within a linear velocity error that can be reproduced and recognized. After that, the controller 6 sequentially outputs accurate radial position information to the CLV control circuit 8 based on the absolute address value from the address decoder 5, so that accurate CLV control is executed thereafter regardless of the presence or absence of recorded information. .

Next, recording of music information and the like will be described. External (Sin)
The analog signal input from the digital signal is converted into a digital signal by the A / D converter 15 and subjected to the predetermined formatting by the recording signal processing circuit 16, and then the magnetic field corresponding to the recording data is passed through the coil driver 17 to the magnetic coil 18 Is applied toward the magneto-optical disk 1. At the same time, the optical head 3 irradiates the magneto-optical disk 1 with a CD-like light beam having a relatively large output required for recording, and lowers the coercive force of the locally raised temperature, Information recording for reversing the magnetization by the applied magnetic field is performed. Note that this method is generally called magnetic field modulation recording, and is a method capable of overwriting even on an already recorded area.

On the other hand, in the reproducing operation of the music information and the like, the polarization component corresponding to the magnetization direction of the laser light irradiated on the rotating magneto-optical disk 1 is detected by the optical head 3 as the intensity of light, and this signal is reproduced. After being amplified by, the reproduced signal processing circuit 10 restores the original digital audio data, and the D / A converter 14 outputs it as an analog signal to the outside (Sout).

Now, the reproduction operation in the TOC area 23 will be described. The information content in the TOC area 23 is, for example, for each piece of music such as music information recorded in the program area 24, its music number and
The recording start position and the recording end position are shown corresponding to the absolute address information 22 ... When the magneto-optical disk 1 is loaded on the spindle motor 2, the controller 6 moves the optical head 3 to the TOC area 23 as described above, and rotates the magneto-optical disk 1 at a constant linear velocity to change the contents of the TOC area 23. The information is reproduced and stored in the TOC memory 11 when the recorded information exists in the TOC area 23. Here, for example, it is assumed that the information recorded in Table 1 below is already recorded.

The recording start position and recording end position corresponding to each song number correspond to the time information indicated by the absolute address information 22 ...
It is reproduced from the C area 23 and stored in the TOC memory 11. The controller 6 displays the above contents on the display 12 with respect to the contents of the TOC memory 11. The user recognizes the contents such as the music information recorded by the above display contents and, for example, if he / she wants to hear the contents of the second tune, the controller 6 receives the designation by operating the operation key 13 and receives the designation. It is possible to select a song by accessing the optical head 3 to the absolute address information position indicating 03'57 "in Table 1. Also, when reproducing music information, the TOC described above is used.
Depending on the contents of the memory 11, the recording start time is subtracted from the absolute address information 22 ... Which is sequentially reproduced starting from the recording start position as a starting point in addition to the music number, and the relative time (elapsed time) of each music is displayed. Time) is displayed on the display 12. Of course, it is also possible to display the above-mentioned absolute address information that is sequentially reproduced as the absolute address time. As described above, by using the contents of the TOC area 23 and the absolute address information that is sequentially reproduced, the subcode information of the program area 24 is not particularly required and useful display can be performed.

Next, the operation of applying write protection to each song will be described. Similar to the above, the user recognizes the contents of the music information and the like recorded by the display contents, and, for example, the fifth
As shown in the figure, when it is desired to write protect the first and third songs, the controller 6 receives the designation by operating the operation key 13 and stores the information in the TOC memory 11. Note that, as shown in the figure, the write protection may be applied simultaneously with the designation of a song between songs provided after the end of the write protected song.

Regarding the operation of copying the contents of the TOC memory 11 as additional information to the TOC area 23, for example, when the magneto-optical disk 1 is removed from the spindle motor 2, or when the user determines that the operation key 13 is input, the TOC memory 11 is designated. After the contents of 11 are converted into a predetermined format by the recording signal processing circuit 16, the same recording process as described above is performed to execute. Therefore, even if the disc is ejected from the disc recording / reproducing apparatus, the write protect information is retained in the disc. Next, when the disc is loaded, the above write protect information is read from the TOC area 23 and
11, the write control is performed according to the contents, and the write protect information once input is valid unless updated, and the write protect is executed for the first and third songs each time the disc is recorded.

In this way, if individual write protection can be applied to each song (information), it is possible to erase and rewrite only unnecessary songs, leaving useful songs, and fully utilize the advantages of rewritable discs. Can be made.

In addition to the write protect for each song, various write protect settings can be made. For example, the user can directly input time information and write protect only a part of the song. . Further, in the above example, when there is a recording instruction for the area of the first song or the third song, write protection is applied to the area and a warning sound is emitted in addition to the display indicating that the write protection is applied. You can also

Next, a disc recording / reproducing apparatus further provided with a fade-out processing function for eliminating a feeling of trailing edge of a song will be described. As shown in FIG. 6, this disc recording / reproducing apparatus is provided with a fader circuit 20 as a fade-out processing means before the A / D converter 15, and the controller 6 is connected to the fader circuit 20. There is.
The fader circuit 20 is analog-level music information (recording signal)
And the fade-out processing is performed on the music information based on a command from the controller 6, and the processed music information is output to the A / D converter 15. Also, the controller 6 is the TOC memory 1
The fader circuit 20 sets the timing at which fade-out processing is performed based on the information in 1 (information acquired from the TOC area 23).
To instruct.

Here, as described above, when the first song and the third song are write protected including the space between songs, the time corresponding to the non-write protect area (recordable area) is 03'57 "to 08 '. 20 ″. That is, there is a recordable area for 4 minutes and 23 seconds. On the other hand, when recording a piece of music having a time of 4 minutes and 23 seconds or more, the piece of music is cut off midway, so fade-out is applied at a predetermined timing. For example, as shown in FIG. 7, 08'20 seconds (t ₂ )
When the write protect is started from 8'1 which is 7 seconds before the write protect start time of 08'20 "by monitoring the elapsed time while recording the music.
At the time of 3 ″ (t ₁ ), the music information is faded out. It is set to be silent 3 seconds before the end of the above 7 seconds, and silence is set for these 3 seconds. It is also possible to maintain the interval between the new 2nd song and the new 3rd song for 3 seconds, and, in the present disc recording / reproducing apparatus, with respect to the music information inputted by the analog signal. Although the fade-out process is performed, when the music information is input as a digital signal, the fade-out process can be applied as it is as a digital signal.

With the above configuration, when the new second song is played, the sound gradually decreases before the end of the song, and the song ends without a feeling of end cut, so that the listener is not made uncomfortable.

〔The invention's effect〕

The disc recording / reproducing apparatus according to the present invention, as described above,
The operation key operated by the user, the memory means for storing the individual write protect information for the predetermined recorded information input by the operation key, and the contents stored in this memory means as additional information in the TOC area. The recording means for re-recording, the control means for blocking the writing to the write protect area, the capacity of the record information when the record information is recorded in the non-write protect area is the capacity of the non-write protect area. If it is larger than the above, a fade-out processing means for adding fade-out processing to the recorded information before the end of the non-write protect area is provided.

As a result, the advantages of a rewritable disc can be fully exerted, such as erasing and rewriting only useless information while leaving useful information. Further, for example, when the recorded information is a piece of music, when it is reproduced, the sound gradually decreases before the end of the piece of music, and the piece of music ends without feeling the end of the piece of music, so that the listener is not annoyed.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention. FIG. 1 is a schematic block diagram showing a circuit configuration of a basic disc recording / reproducing apparatus having a configuration capable of individually performing write protection for each song. FIG. 2 is a schematic diagram showing the recording format of a magneto-optical disk. FIG. 3 is a structural diagram showing the format of one frame of a recording signal. FIG. 4 is a structural diagram for explaining the format of absolute address information. FIG. 5 is an explanatory diagram showing the write protection status of the first to third songs. FIG. 6 is a schematic block diagram showing a circuit configuration of a disc recording / reproducing apparatus further having a fade-out processing function. FIG. 7 is an explanatory diagram showing the relationship between the fader input signal and the fader output signal in the configuration of FIG. 1 is a magneto-optical disk, 6 is a controller (control means),
11 is a TOC memory (memory means), 13 is an operation key, 16 is a recording signal processing circuit (recording means), 17 is a coil driver (recording means), 18 is a magnetic coil (recording means), and 20 is a fader circuit (fade-out processing). Means), 21 is a track, 22 is absolute address information, 23 is a TOC area, and 24 is a program area.

Claims (1)

[Claims] 1. A disc recording / reproducing apparatus using a rewritable disc having absolute address information and a recording area having a program area for recording recording information and a TOC area for recording additional information of the recording information. , An operation key operated by the user, a memory means for storing individual write protect information for predetermined recorded information input by the operation key, and a TOC area with the content stored in this memory means as additional information Recording means for re-recording in the write protect area, control means for preventing this from writing in the write protect area, and the capacity of the record information when the record information is recorded in the non write protect area. If it is larger than the capacity, the recorded information will be recorded before the end of the non-write protect area. A disc recording / reproducing apparatus comprising: a fade-out processing unit that adds a fade-out processing.