JP3061678B2 - Disk recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus for recording / reproducing an information signal such as a digital audio signal and additional information relating to the information signal on / from a disk-shaped recording medium, and more particularly, to utilizing the additional information. The present invention relates to a disk recording / reproducing apparatus that controls recording or reproduction of an information signal.

[0002]

2. Description of the Related Art In recent years, various types of consumer digital audio devices have been developed. Typical examples are a compact disk player (hereinafter, referred to as "CD") and a digital audio tape recorder (hereinafter, referred to as "DAT"). While CDs have only a playback function, DATs have the characteristic that they can be recorded. However, DATs are disadvantageous in terms of high-speed access compared to CDs in which the recording medium is a disc because the tape is a recording medium. It is.

[0003] Japan Electronic Machinery Manufacturers Association Standard EIAJ CP-
In a program (for example, a song) and a subcode of a recorded tape based on the 2305 “DAT cassette system”, information indicating whether or not copying of the program is prohibited is included in the subcode area. Thus, the details of copying a tape from DAT 31 to DAT 32 with the configuration shown in FIG. 6 will be described below.

When a tape is copied from a DAT 31 to a DAT 32 with respect to a program recorded in the order as shown in FIG. 7, the copying DAT 32 detects a subcode for which duplication is inhibited from input data. Automatically stops recording and stops subsequent duplication. In other words, during reproduction of the tape, duplication to the (n-1) th music is performed, and duplication inhibition is detected at the nth music, so that the recording of the DAT 32 is stopped.
Therefore, even if there is a program that can be copied after the (n + 1) th music (for example, the (n + 2) th music), the program is not copied.

[0005] Further, since the information prohibiting copying is recorded in the subcode portion of the program on the tape,
Until the program is reproduced, it cannot be determined whether the program is copy-protected or not. That is, D
During the reproduction of the AT 31, it is found that the reproduction of the n-th music is prohibited for the first time after the reproduction of the n-th music.

On the other hand, a recording / reproducing apparatus using a disk as a recording medium has been developed in recent years. As an example, see Radio Technology December 1991, p. 152-p. There is an MD system disclosed in 155 published articles "Features and Prospects of MD (Mini Disc) System Talked by Developers". The MD records and reproduces an audio signal data-compressed on a disk by a magneto-optical method. The audio signal is 1 /
Although the signal is compressed to 5, the recording / reproducing rate on the disk is the same as before the compression, so that the signal is read from the disk only for 1/5 of the time, and the remaining 4/5 can be read even if the reading is stopped. Normal music playback is possible. Actually, 1Mbit
When the buffer memory of the above is used, normal music reproduction can be continued for 3 seconds even if signal reading from the disk is stopped.

[0007] In the MD, time information continuous in the guide groove of the light spot is formed in advance on the entire circumference of the disc even before recording, and this information can be used for high-speed access. Therefore, in the MD, the order of the programs to be reproduced can be set arbitrarily, and by using the buffer memory as described above, reproduction without skipping can be performed when selecting the next program.

Hereinafter, the MD system will be described with reference to the drawings. FIG. 8 is a block circuit diagram showing the configuration of the MD system. In the figure, 1 is an analog audio input terminal, 2 is an analog / digital conversion circuit (A / D
Conversion circuit), 24 is a digital audio input terminal, 2
5 is a digital audio interface circuit, 3 is a data compression circuit, 4 is a buffer memory, 5 is an encoding circuit for generating and adding an error correction code, 6 is a modulation circuit, 7 is a recording head drive circuit, 8 is a recording magnetic head, 9 Is a disk, 1
0 is an optical pickup, 11 is an RF amplifier, 12 is a demodulation circuit, 13 is an error control circuit, 14 is a buffer memory, 1
5 is a data expansion circuit, 16 is a digital / analog conversion circuit (D / A conversion circuit), 17 is an analog audio output terminal, 26 is a digital audio interface circuit, 27 is a digital audio output terminal, 18 is an address decoder, and 19 is a micro decoder. A computer, 20 is a servo circuit, 21 is a motor, 22 is a key input, and 23 is a display circuit.

First, the operation of recording and reproducing an audio signal will be described with reference to FIG. The analog audio signal supplied to the analog audio input terminal 1 is A
The signal is sampled in the / D conversion circuit 2 and converted into a digital signal. Alternatively, a digitized audio signal is supplied to the digital audio input terminal 24 by an optical connector or a coaxial cable according to the standard of the digital audio interface, and is supplied to the data compression circuit 3 through the digital audio interface 25. In the data compression circuit 3, a so-called voice encoding process is performed to reduce the signal information amount to about 1/4 to 1/8. As a voice coding method, for example, DCT
A transform code such as (Discreat Cosine Transform coding) or a code based on band division, or a method for reducing the amount of unnecessary information by using these and a human auditory characteristic is used.

[0010] The compressed signal is temporarily stored in the buffer memory 4. Since the information amount has been compressed to 1/4 to 1/8, it is intermittently read at the same signal rate as before compression as shown in FIG. That is, in the figure, the time t0 to t2
The signal sequence input to the buffer memory 4 during the period is read out from the buffer memory 4 between the times t2 and t3.
Similarly, the signal sequences input during times t2 to t4, t4 to t6, and t6 to t8 are time t4 to t5, t6, respectively.
To t7 and t8 to t9. At time t1
Between t2, t3 to t4, t5 to t6, and t7 to t8 (shaded portions in the drawing), reading of the buffer memory 4 is stopped.

The encoding circuit 5 performs an interleaving process for rearranging the order of the signals and a process of generating and adding an error correction code in order to disperse errors at the time of reproduction. EFM (Eight to Fourteen Modul) so that energy can be concentrated in the frequency band suitable for playback and self-clock extraction can be performed during playback.
ation). This signal is recorded on the disk 9 from the recording magnetic head 8 via the recording head drive circuit 7. For example, in magneto-optical recording, a laser spot is applied to an area to be recorded by an optical pickup, and a new recording is performed by the recording magnetic head 8 while raising the temperature to erase the previous magnetism. This recording operation is performed intermittently in response to a signal read out intermittently from the buffer memory 4. That is, recording is performed while alternately repeating the recording state and the standby state of the pause state.

At the time of reproduction, a signal written on the disk is read by the reflected light of the light radiated from the optical pickup 10 to the disk 9. The optical information is converted into an electric signal by the optical pickup 10 and supplied to the RF amplifier 11. The signal amplified by the RF amplifier 11 is supplied to a demodulation circuit 12, where demodulation such as EFM is performed, and the original signal sequence is restored. On the other hand, the output of the RF amplifier 11 is also supplied to the address decoder 18. The address decoder 18 reproduces an address signal continuous over the entire circumference of the disk 9 and detects wobbling of the guide groove for the purpose of extracting information contained in the light spot guide groove previously engraved on the disk 9. I get tracking information. This tracking information is supplied to a servo circuit 20 to perform tracking servo so that the optical pickup 10 scans a predetermined guide groove, and keeps the disk rotation constant at a constant linear velocity so that the guide groove swells at a constant period. Servo is applied.

An error control circuit 13 corrects an error in the signal sequence by using an error correction code included in the signal sequence restored by the demodulation circuit 12, and reorders the signal sequence by interleaving. To the original order. As shown in FIG. 10, the buffer memory 14 temporarily stores intermittently input data and continuously outputs the data. That is, in the figure, the signal sequence input to the buffer memory 14 between times t0 and t1 is continuously output between times t1 and t3. Similarly, at times t2 to t3, t4
The signal sequence input during the period from time t5 to time t6 to t7 is continuously output during the period from time t3 to time t5, time t5 to time t7, and time t7 to time t9. Also, at times t1 to t2, t3 to t4,
Between t5 and t6 and between t7 and t8 (shaded portions in the figure), the writing of the buffer memory 14 is stopped.

The data decompression circuit 15 decodes the compressed data and restores the original time-series digital audio signal. The restored signal is output as an analog audio signal from an analog audio output terminal 17 via a D / A conversion circuit 16 and a digital audio signal conforming to the digital audio interface standard via a digital audio interface circuit 26. Are output from the digital audio output terminal 27. The microcomputer 19 controls various recording / reproduction such as the servo circuit 20 and the buffer memory 14 based on the reproduced additional information and the key input 22.

[0015]

SUMMARY OF THE INVENTION Conventional DAT and MD
Is configured as described above, when duplicating a tape or a disc, when the reproduction DAT or MD reproduces a program in which the information prohibiting duplication is added, the recording DAT or MD is stopped. Become. Also, when trying to duplicate, there is a problem that it is impossible to know which program can be duplicated and how long the reproduction time will be unless the program is reproduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and duplication is prohibited in an apparatus for recording and reproducing information signals such as digital audio signals and digital data on a disk-shaped recording medium. It is an object of the present invention to provide a disk recording / reproducing apparatus which can easily copy a disk for only a program without the program.

[0017]

A disk recording / reproducing apparatus according to the present invention provides an area for recording additional information related to a program, a so-called TOC (Table of Contents), in an area on a disk different from the program, and The start address indicating the start position of the program and the reproduction time are recorded in the TOC corresponding to the number of each program, and the duplication inhibition information indicating whether duplication of the program is inhibited or not is recorded in the subcode of each program. In this way, when the disc is mounted on the disc recording / reproducing apparatus, the TOC information is reproduced when the power of the disc recording / reproducing apparatus on which the disc is mounted is turned on, and the start address and the reproduction time of each program are stored internally. Of each program using the start address of each program. In a disk recording / reproducing apparatus which reads the copy inhibition information from the subcode and stores it in the internal storage device, when duplicating a disk, the start address of each program stored in the internal storage device and From the playback time and copy prohibition information,
Only the duplicatable program is automatically selected, and only the selected duplicatable program is reproduced.

Further, when duplicating a disk, the disk recording / reproducing apparatus according to the present invention can copy or duplicate a duplication from the start address, reproduction time, and duplication inhibition information of each program stored in an internal storage device. Means for automatically selecting a prohibited program, means for calculating the total reproduction time of the selected program from the reproduction time of each of the selected duplicatable or duplication-prohibited programs, and selection thereof Means for displaying the program number and the total playback time of the program.

[0019]

The disc recording / reproducing apparatus according to the present invention selects only the program that can be copied, so that the program whose duplication is prohibited is not reproduced, and the optical disc is reproduced while the program stored in the buffer memory is reproduced. The pickup jumps to the start address of the next duplicatable program, so that only the duplicatable program is reproduced without skipping.

Further, the disk recording / reproducing apparatus according to the present invention can display in advance a program number of a program that can be duplicated or prohibited from being duplicated and a total reproduction time.

[0021]

【Example】

Embodiment 1 FIG. FIG. 1 is a diagram showing the configuration of an embodiment of the disk recording / reproducing apparatus of the first invention according to the present invention. In the figure, 1 to 18, 20 to 21, and 23 to 27 are the same as those of the conventional MD system shown in FIG. Reference numeral 33 denotes a circuit for detecting the copy prohibition information, and reference numeral 34 denotes a microcomputer for controlling various recording and reproduction of the servo circuit 20 and the buffer memory 14 based on the reproduced additional information, the key input, and the copy prohibition information. A key input 35 is provided with a key for duplicating a disk as compared with the key input 22 of the conventional example.

FIG. 2 shows an algorithm for automatically reproducing only the duplicatable program of the disk recording / reproducing apparatus according to the first embodiment. For example, five programs are already recorded, the start address and the reproduction time of each program are recorded in the TOC, and the copy prohibition information for setting whether to prohibit the duplication of the program is included in the subcode of each program. Consider a recorded disc. Here, assuming that the copy prohibition information is copy prohibition for the second and fourth music pieces and that the first music piece, the third music piece, and the fifth music piece can be copied, this algorithm is as follows. First, when the above-mentioned disc is mounted on the disc recording / reproducing apparatus, or when the power of the disc recording / reproducing apparatus on which the disc is mounted is turned on, the TOC information is reproduced. The time is stored in the internal storage device, the head of each program is reproduced using the start address of each program, the duplication inhibition information is read from the subcode, and stored in the internal storage device. Next, when the reproduction of the disc is started, the first music can be duplicated from the duplication inhibition information of the first music stored in the internal storage device, so that the program is reproduced for the reproduction time from the start address of the first music. Next, since the reproduction of the second music is prohibited, the reproduction prohibition information of the third music is read out without reproducing the program. Since the third song can be copied, the program is reproduced in the same manner as the first song.
Similarly, the fourth tune is not reproduced, but the fifth tune is reproduced. Then, the disc ends, and the duplication ends.
When a disk is duplicated as described above, one
Only the third tune, the third tune and the fifth tune can be reproduced.

In this reproduction, the first and third tunes and the third tune are used by using the buffer memory 14.
The music can be reproduced without skipping between the tune and the fifth tune. That is, assuming that the last data of the first tune is written to the buffer memory 14 at time t1 in FIG. 10, the third tune to be reproduced next is selected between times t1 and t2, and the third tune is selected between times t2 and t3. By writing the first data of the first song into the buffer memory 14, the reproduction of the first song is completed at the same time as the reproduction of the first song at time t3, and the first and third songs can be reproduced without skipping.

In this embodiment, the copy inhibition information detection circuit 33
However, this processing may be performed inside the microcomputer 34.

Embodiment 2 FIG. Hereinafter, an embodiment of a disk recording / reproducing apparatus according to the second invention will be described with reference to the drawings. FIG.
Is an example of a display portion of the disk recording / reproducing apparatus according to this embodiment. In the figure, reference numeral 28 denotes a program number display portion, which displays the number of programs recorded on the disc, the number of the program currently being reproduced, and the like.
Reference numeral 29 denotes a portion for displaying time information, which indicates the total reproduction time of the program recorded on the disk, the absolute reproduction time from the beginning of the disk, and the like. Numeral 30 is a portion in which program numbers are individually displayed, and can display only a selected program such as when an arbitrary program is selected and reproduced.

In the disk recording / reproducing apparatus having the above-described display circuit, when duplicating a disk, a duplicatable program or a program for which duplication is prohibited is detected from the reproduced subcode information, and the number of programs is determined. The program number is displayed on the selected program number display section 30 while being displayed on the program number display section 28. For example, the program has 12 songs, the total playback time is 64 minutes and 28 seconds, and the 1, 2, 4, 6, 7, and 10 songs can be duplicated, and the 3, 5, 8, 9, 11, and 12th songs cannot be duplicated. When a disc on which a program as described above is recorded is mounted on the disc recording / reproducing apparatus, or when the power of the disc recording / reproducing apparatus on which the disc is mounted is turned on, the disc recording / reproducing apparatus automatically reads the TOC information. At the same time, the head portion of each program is reproduced using the start address of each program, the duplication inhibition information is read from the subcode, and stored in an internal storage device.

Next, the number of recorded programs and the total playback time calculated from the playback time of each program are displayed on the display unit (FIG. 4). When duplicating a disc, the number of programs that can be duplicated from the subcode information is displayed on the program number display section 28, and the program numbers are displayed on the selected program number display section 30 (FIG. 5). ). Here, the number of programs and the program number may be displayed in the same manner for programs for which copying of the disk is prohibited.

Embodiment 3 FIG. Hereinafter, an embodiment of a disk recording / reproducing apparatus according to the third invention will be described with reference to the drawings. FIG.
Is an example of a display portion of the disk recording / reproducing apparatus according to this embodiment, which is the same as that of the second embodiment of the present invention, and the description is omitted. When duplicating a disk using a disk recording / reproducing apparatus having such a display section, the program number of a program that can be duplicated or prohibited from being reproduced by the subcode information and the reproduction time calculated from the reproduction time of the program Is displayed on the program time display section 29. For example, when duplicating a disk using the same disk as in the embodiment of the second invention, the total reproduction time of the duplicatable program (for example, 31 minutes 2 minutes)
9 seconds) is displayed on the program time display section 29 (FIG. 5). Alternatively, here, the total reproduction time of a program for which copying is prohibited may be displayed.

As described above, in the first to third embodiments, the copy prohibition information is recorded in the subcode of each program.
This copy prohibition information is recorded in the TOC,
Only by reproducing the C information, it may be detected whether or not each program is prohibited from being copied.

Further, the start address is recorded in the TOC information, but any position information indicating the start may be used.

Further, the end position of the program to be reproduced is calculated from the start address and the reproduction time. However, the end position of the program is obtained by another method, and the program is reproduced up to the end position. You may jump.

[0032]

As described above, according to the first aspect, when reproducing a disc on which a program is already recorded, a program whose duplication is prohibited is not reproduced, and only a duplicatable program is reproduced. There is an effect that the program can be reproduced, and the program can be reproduced without skipping between the programs to be reproduced. Also, select only programs that are prohibited from being copied,
There is an effect that it can be reproduced.

Further, according to the second aspect of the invention, when playing back a disk on which a program is already recorded, the program number of a program that can be copied or prohibited from being copied can be displayed in advance. .

According to the third aspect of the present invention, when playing back a disk on which a program is already recorded, the total playback time of a program that can be copied or prohibited from being copied can be displayed in advance. There is.

[Brief description of the drawings]

FIG. 1 is a block diagram of a disk recording / reproducing apparatus according to an embodiment of the first invention.

FIG. 2 is a diagram showing a duplication algorithm when a disk is duplicated by the disk recording / reproducing apparatus according to the embodiment.

FIG. 3 is a diagram showing a display unit of a disc recording / reproducing apparatus according to one embodiment of the second and third inventions.

FIG. 4 is a diagram showing a display unit when a disk of the disk recording / reproducing apparatus according to one embodiment of the second invention is mounted.

FIG. 5 is a diagram showing a display unit when duplicating a disc of the disc recording / reproducing apparatus according to one embodiment of the second and third inventions.

FIG. 6 shows a conventional DAT for duplicating a tape.
It is a block diagram of AT.

FIG. 7 is a diagram showing timing when a tape is duplicated by a conventional DAT.

FIG. 8 is a block diagram of an MD system.

FIG. 9 is a timing chart of writing and reading of a buffer memory used in the MD system.

FIG. 10 is a write / read timing chart of a buffer memory used in the MD system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Analog audio input terminal 2 Analog / digital conversion circuit 3 Data compression circuit 4 Buffer memory 5 Encoding circuit for generating and adding an error correction code 6 Modulation circuit 7 Recording head driving circuit 8 Recording magnetic head 9 Disk 10 Optical pickup 11 RF amplifier 12 Demodulation circuit 13 Error control circuit 14 Buffer memory 15 Data expansion circuit 16 Digital / analog conversion circuit 17 Analog audio output terminal 18 Address decoder 20 Servo circuit 21 Motor 23 Display circuit 24 Digital audio input terminal 25 Digital audio interface circuit 26 Digital audio interface circuit 27 Digital audio output terminal 28 Program number display section 29 Program time display section 30 Selected program number display section 33 Ltd. inhibition information detection circuit 34 microcomputer 35 keystrokes

Continuation of the front page (56) References JP-A-5-20850 (JP, A) JP-A-4-60962 (JP, A) JP-A-4-13274 (JP, A) JP-A-3-120651 (JP) JP-A-2-134769 (JP, A) JP-A-3-76051 (JP, A) JP-A-63-34787 (JP, A) JP-A-4-103323 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 27/02-27/08 G11B 20/10 G11B 19/02 G11B 7/00-7/005

Claims (3)

(57) [Claims] 1. An apparatus for recording and reproducing an information signal such as a digital audio signal and additional information related to the information signal on a disk-shaped recording medium, comprising a continuous address indicating a position on a disk together with the information signal. An apparatus that records an address signal and records and reproduces, as the additional information, a start address indicating a start position of each program of the information signal, a reproduction time of the program, and information indicating whether copying of the program is prohibited or not. Means for automatically selecting only a program that can be duplicated or prohibited from being duplicated when reproducing the already recorded information signal; and selecting the information signal from the position of the start address of the selected program. After the reproduction is started and the information signal is reproduced for the reproduction time of the selected program, the next duplication is possible. Means for restarting reproduction of the information signal from the start address of the program. 2. An apparatus for recording and reproducing an information signal such as a digital audio signal and additional information related to the information signal on a disk-shaped recording medium, comprising a continuous address indicating a position on a disk together with the information signal. An apparatus that records an address signal and records and reproduces, as the additional information, a start address indicating a start position of each program of the information signal, a reproduction time of the program, and information indicating whether copying of the program is prohibited or not. Means for automatically selecting only a program that can be duplicated or prohibited from being duplicated when reproducing the already recorded information signal, and means for displaying the number of the selected program in advance. A disk recording / reproducing apparatus comprising: 3. An apparatus for recording / reproducing an information signal such as a digital audio signal and additional information relating to the information signal on a disk-shaped recording medium, comprising a continuous address indicating a position on the disk together with the information signal. An apparatus that records an address signal and records and reproduces, as the additional information, a start address indicating a start position of each program of the information signal, a reproduction time of the program, and information indicating whether copying of the program is prohibited or not. When the information signal already recorded is reproduced, the selecting means for automatically selecting only the program which can be copied or the duplication of which is prohibited, and the reproduction time of each of the selected programs, Display means for calculating the total playback time of the program; and display means for displaying the total playback time in advance. A disk recording / reproducing apparatus comprising: