JP2896480B2 - Recording device 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 recording device for recording an information signal such as a digital audio signal on a recording medium, and
The present invention relates to a reproducing apparatus for reproducing an information signal recorded on a recording medium.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram showing an example of a conventional configuration for duplicating an audio signal (for example, an audio signal such as music). In the figure, 43 is a compact disc player (hereinafter, referred to as “CD player”),
44 is a tape recorder. Conventionally, in order to duplicate an audio signal, the above-described configuration is required. For example, an audio signal recorded on a compact disc (hereinafter, referred to as a “CD”) is reproduced by a CD player 43, and the reproduced audio signal is reproduced. Recording is performed by the tape recorder 44.

[0003] When an audio signal is duplicated by the above-described conventional method, the reproduction time of the audio signal is required to be equivalent to the reproduction time. In the case of performing the recording in a time of 2, it is necessary to take a process of recording the reproduced audio signal at a double speed by a tape recorder 44 while reproducing the audio signal recorded on the CD by a CD player 43 at a double speed. . Therefore, the CD player 43 needs a mechanism for reproducing a signal recorded on a CD at a double speed and a circuit for digital signal processing and the like.
The 44 requires a mechanism and a circuit for recording at double speed, so that the structure of the duplication apparatus becomes complicated. In addition, there is a problem that the maximum speed is about twice as high as the speed at which a signal is duplicated.

In recent years, digital audio equipment using an optical disk has been developed. A CD is well known as a reproduction-only system that cannot be recorded by a user.
Further, as a recordable system, there is a write-once optical disc called CD-R, which can be written only once.
Further, a magneto-optical type optical disc device capable of recording any number of times is being developed.
In the December issue pp.152-155, "Developers talk about the features and prospects of minidisc (MD) systems," or in the Nikkei Electronics December 5, 1991 issue, pp.160-168, "Minidisk." , Realized by magneto-optical recording and data compression technology ".

The MD records and reproduces an audio signal obtained by compressing data on a disk by a magneto-optical method, and a guide groove for tracking control is formed on the disk before recording. Further, address information continuous over the entire circumference of the disk is formed in advance using the guide groove.
Therefore, the search can be performed regardless of the presence or absence of the recording signal.

FIG . 10 is a block diagram of the MD system. In the figure, 1 is an audio input terminal of 2 channels, 2 is an analog / digital (A / D) conversion circuit, 3
Is a data compression circuit, 4 is a buffer memory for recording, 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 magnetic recording head, 9
Is a disk, 10 is an optical pickup, 11 is a playback amplifier,
12 is a demodulation circuit, 13 is an error control circuit, 14 is a buffer memory for reproduction, 15 is a data decompression circuit, 16 is a digital / analog (D / A) conversion circuit, 17 is a 2-channel audio output terminal, and 18 is an address. A decoder, 19 is a microcomputer, 20 is a servo circuit, 21 is a motor, 22 is an input key, and 23 is a display circuit.

FIG . 11 is a timing chart of signal processing during recording / reproduction. The operation will be described with reference to FIGS.
The analog audio signal supplied to the audio input terminal 1 is sampled in the A / D conversion circuit 2 and converted into a digital signal. This signal is subjected to voice compression encoding processing in the data compression circuit 3, and is reduced to about 1/5 of the original signal information amount.

[0008] The compressed signals are temporarily stored in the buffer memory 4 are read at the same signal rate as before intermittently compressed as in FIG. 11 (b). The encoding circuit 5 performs an interleaving process for rearranging the signal order and a process of generating and adding an error correction code in order to disperse errors at the time of reproduction, and the next modulation circuit 6 is suitable for recording and reproduction. Energy is concentrated in the frequency band, and modulation is performed so that a self-clock can be extracted during reproduction. This signal is magneto-optically recorded on the disk 9 from the magnetic recording head 8 via the recording head drive circuit 7. The recording operation is performed in response to the intermittently supplied modulation signal ( FIG. 11 (c)) .
As shown in FIG. 11 (d), the recording state and the recording pause state are alternately repeated, and before recording, the last address of the previously recorded portion is searched for and recorded continuously.

At the time of reproduction, a signal written on the disk 9 is read by the reflected light of the light radiated from the optical pickup 10 to the disk 9. This optical information is converted into an electric signal by the optical pickup 10 and is reproduced by the reproduction amplifier 11.
Supplied to The signal amplified by the reproduction amplifier 11 is provided to the demodulation circuit 12, where the signal is demodulated to restore the original signal sequence.

On the other hand, the output of the reproduction amplifier 11 is also supplied to an address decoder 18. The address decoder 18 reproduces a continuous address signal over the entire circumference of the disk 9 for the purpose of extracting information contained in a light spot guide groove previously engraved on the disk 9.
Tracking information is obtained by detecting wobbling of the guide groove. This tracking information is supplied to a servo circuit 20, and a tracking servo is applied so that the optical pickup 10 scans a predetermined guide groove, and the disk rotation is kept at a constant linear velocity so that the guide groove swells at a constant period. The servo 21 is applied to control the motor 21.

The reading of the signal from the disk 9 is performed intermittently in the same manner as the writing at the time of recording . As shown in FIGS. 11 (e) and 11 (f), the reproducing operation and the reproducing pause state are alternately repeated. . The signal demodulated by the demodulation circuit 12 is subjected to error detection and correction processing in an error control circuit 13 and is subjected to deinterleaving processing for restoring the order of the signals, and is then supplied to a buffer memory 14 and is supplied from the buffer memory 14. The read signal is supplied to the data expansion circuit 15. Normally, the input of the buffer memory 14 is controlled so that the signal is held at a predetermined amount or more. That is, as shown in FIG. 11 (h), when the data amount of the buffer memory 14 becomes full, the input is stopped and the reproduction is suspended, and the buffer memory 14 is stopped.
When the remaining data amount of 14 falls below the point indicated by a, the disk 9
The continuation portion of the already read signal is searched for reproduction, and data is supplied to the buffer memory 14. For this reason,
For example, even when the optical pickup 10 jumps due to disturbance, at least the data amount a
Is read out, and by reading out this signal and searching for a portion immediately before jumping during that signal, continuous reproduction can be performed without interruption of sound.

The audio signal restored to the information amount before compression by the data decompression circuit 15 is converted to an analog signal by the D / A conversion circuit 16 and then output from the audio output terminal 17. The microcomputer 19 includes an address decoder 18
Address signal engraved in the disc guide groove from
An address signal recorded corresponding to the audio signal is received, and an input signal is received by an external input key 22 to control the entire system. Further, the display circuit 23 is driven to perform display to the outside.

[0013]

In the conventional system,
Measures are taken to prevent the sound from being cut off even if the needle jumps due to an impact during playback, and are suitable for portable systems and in-vehicle systems. However, in a general stationary type system, needle jumps hardly occur due to impact, so use of intermittent recording and playback by compressing continuous signals for other purposes and propose new functions It is desired to do.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a recording apparatus and a reproducing apparatus which can copy an information signal at a high speed with a simple configuration without deteriorating the quality. To provide.

Another object of the present invention is to provide a reproducing apparatus capable of improving the reliability of a reproduced signal.

[0016]

According to a first aspect of the present invention, there is provided a recording apparatus.
A recording apparatus for recording information signals obtained by compressing the amount of information on a recording medium, compressing a first input means for inputting an information signal that is not compressed, the information signal input at said first input means and compression means, and a first recording control means for intermittently recording information signal compressed by said compression means in a first mode, a second input means for inputting compressed information signals, said second means for selecting a second recording control means for continuously recording the information signal input by the input means at the second mode, and said first mode and a second mode, the compressed information Means for detecting the copy prohibition information from the signal and outputting a signal to the second recording control means to stop the recording when detected.

The reproducing apparatus of the second invention compresses the information amount .
In the reproducing apparatus for reproducing information signals recorded on the recording medium by a first reproduction control means for reproducing intermittently an information signal recorded on the recording medium in a first mode, the first extension means and a first output means for outputting data expanded by該伸length unit, information recorded on the recording medium in the mode extension information signal reproduced by the first reproduction control means Signal the second mode
A second reproduction control means for reproducing continuously at a second output means for outputting the reproduced information signal by a second said at mode of the second reproduction control means, a first mode the Means for selecting the second mode, and means for detecting duplication inhibition information from the reproduced information signal and outputting a signal to the second reproduction control means to stop reproduction when detected. Features.

[0018]

[0019]

The recording apparatus and the reproducing apparatus according to the first and second aspects of the present invention continuously reproduce a signal (for example, an audio signal) recorded on a recording medium by compressing the signal and compressing the signal without decompression. It records on the other recording medium as it is. For this reason, compressed data is selected and recorded when performing normal recording, and compressed data that is continuously reproduced is selected and recorded when performing duplication.

[0020]

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments.

Embodiment 1 FIG. In the first embodiment, the copyrighted digital audio
Prohibit unlimited copying of e-signals
Systems such as SCMS (Serial Copy Management
System) or SCMS.
There is. FIG. 1 shows a recording / reproducing apparatus according to the present invention.
FIG . 2 is a block circuit diagram showing a configuration of an embodiment when applied to an optical disc such as an MD. FIG. 2 is a reproducing apparatus according to the present invention.
Is also applied to an optical disc such as an MD.
FIG. 3 is a block circuit diagram illustrating a configuration of an example . Reference numeral 102 in FIG. 1 indicates a recording / reproducing system, and FIG.
101 indicates a playback-only system. In FIGS 1
Is a 2-channel audio input terminal, 2 is an analog /
Digital (A / D) conversion circuit, 3 is a data compression circuit,
4 is a buffer memory for recording and 5 is an error correction code
An encoding circuit to be added, 6 is a modulation circuit, and 7 is a recording head drive.
Motion circuit, 8 is a magnetic recording head, 9a is a recorded disk,
9b is a recording / playback disk, 10 is an optical pickup, 11
Is a reproduction amplifier, 12 is a demodulation circuit, 13 is an error control circuit, 14 is
A buffer memory for reproduction, 15 is a data decompression circuit, and 16 is a data
Digital / analog (D / A) conversion circuit, 17 is 2 channels
Channel audio output terminal, 18 is an address decoder, 19
Is a microcomputer, 20 is a servo circuit, 21 is a motor
, 22 is an input key, 23 is a display circuit, 24 is a mute circuit,
25 is an input switch.

The operation of recording and reproducing an audio signal will be described with reference to FIGS. Here, the recording / reproducing system 102 shown in FIG. 1 will be described. In the case of normal recording / playback, the input selection switch 25 selects a. The analog audio signal supplied to the audio input terminal 1 is sampled and quantized in an A / D conversion circuit 2, converted into a digital signal, and supplied to a data compression circuit 3. In the data compression circuit 3, so-called high-efficiency encoding processing of audio is performed, and the signal amount is reduced to about 1/5 of the original signal information amount. As a high efficiency coding method ,
For example, transform codes such as DCT (Discrete Cosine Transform coding), coding by band division, and a method of reducing unnecessary information amount by using these and human auditory characteristics are used.

The compressed signal is temporarily stored in the buffer memory 4. Here, in order to read out a signal whose information amount has been reduced to 1/5 at the same signal rate as before compression, writing of the signal to the buffer memory 4 is performed continuously, but reading of the signal from the buffer memory 4 is not performed. Performed intermittently. FIG. 3 shows a temporal change in the amount of information stored in the buffer memory 4. As shown in this figure, the signal sequence read into the buffer memory 4 between the times 0 and t5 is read from the buffer memory 4 between the times t5 and t6. Similarly, the signal sequence read between times t5 and t11 is read between times t11 and t12.

The encoding circuit 5 performs an interleaving process for rearranging the order of signals in order to disperse errors during reproduction,
A process of generating and adding an error correction code is performed. Further, in the next modulation circuit 6, energy is concentrated in a frequency band suitable for recording / reproducing, and an EFM (Eight to Eight to Eight) is provided so that a self-clock can be extracted during reproduction. FourteenMod
modulation).

This signal is recorded on the disk 9b from the magnetic recording head 8 via the recording head drive circuit 7. For example, in magneto-optical recording, a new recording is performed by the magnetic recording head 8 while irradiating a laser spot to the area to be recorded by the optical pickup 10 and raising the temperature to erase the previous magnetism. This recording operation corresponds to a signal read out intermittently from the buffer memory 4, for example, at time t5 in FIG.
The operation is intermittently performed between t6 and t11 to t12. That is, recording is performed while alternately repeating the recording state and the standby state of the pause state.

At the time of reproduction, the optical pickup 10 uses the reflected light of the light applied to the disc 9b to reflect the disc 9b.
Read the signal written above. The light information is converted into an electric signal by the optical pickup 10 and supplied to the reproduction amplifier 11. The signal amplified by the reproduction amplifier 11 is a demodulation circuit
12 and demodulated by EFM or the like to restore the original signal sequence.

On the other hand, the output of the reproduction 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 9b 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 9b. I get tracking information. This tracking information is supplied to a servo circuit 20 and a tracking servo is applied so that the optical pickup 10 scans a predetermined guide groove, and a servo that keeps the disk rotation at a constant linear velocity so that the guide groove swells at a constant period. Is applied.

The 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 converts the signal sequence rearranged by interleaving processing into the original sequence. to return to the order, back
Memory 14 and a copy inhibition information detecting circuit as shown in FIG.
Output to 26 . Copy prohibition information is recorded as additional information.
In the same area as the digital audio signal,
Is dedicated to additional information independent of the digital audio signal.
Recorded in the storage area. Duplication prohibited information detection circuit 26
If the copy prohibition information is detected, the
Control signal to the microcomputer 19
Computer 19 immediately stops recording or playback.
Generates a control signal and inhibits duplication. Of course, in FIG.
The error control circuit 13 shown in FIG.
Sends control signal to microcomputer 19 to stop recording
Control may be performed. Dedicated additional information
Copy prohibition information recorded in the area to audio signals
Read beforehand, judge it, then duplicate
May be determined. In the first embodiment,
Provided the copy prohibition information detection circuit 26,
It may be performed inside the micro computer 19. The buffer memory 14 temporarily stores intermittently input data,
Output continuously. FIG. 4 shows a temporal change in the amount of information stored in the buffer memory 14. As shown in this figure, when the buffer memory 14 is filled with data at time 0, writing of data to the buffer memory 14 is stopped at that time and the address on the disk 9b at time 0 is stored.

Next, during the time 0 to t5, the buffer memory 14
When the amount of data in the buffer memory 14 decreases, a control signal is sent from the microcomputer 19 to the servo circuit 20, and the motor 21 moves the optical pickup 10 at time t5 to the point of the address stored at time 0. Return and continue playing. It should be noted that data is continuously read out between times t5 and t6.

Similarly, when the buffer memory 14 is filled with data at time t6, the writing of data to the buffer memory 14 is stopped at that time, and the address on the disk 9b at time t6 is stored. After reading the data from the buffer memory 14 during t11, the optical pickup 10 is returned to the point of the address stored at time t6 at time t11 to continue the reproduction. That is, as shown in FIG. 4, the signal writing to the buffer memory 14 is performed intermittently, but the signal reading from the buffer memory 14 is performed continuously.

The data expansion circuit 15 expands the compressed data and restores the original time-series digital audio signal. The restored signal is output as an analog audio signal from an audio output terminal 17 via a D / A conversion circuit 16. The microcomputer 19 controls various recording / reproduction such as the servo circuit 20 and the buffer memory 14 based on the reproduced additional information.

Although the operation of the recording / reproducing system 102 has been described, the operation of the reproducing-only system 101 is the same as the reproducing operation of the system 102.

Here, an audio signal compressed to 1/5 is recorded on the recorded disk 9a.
When the data between the times t0 to t1, t1 to t2, and t2 to t3 in (a) is compressed and recorded and read at the same signal rate as before compression, the time required for reading is as shown in FIG.
As shown in FIG. 5, the time is between times t0 to t4, t1 to t5, and t2 to t6. These compressed data are read continuously at the same signal rate as before compression,
9b, the audio signal sequence between the times t0 and t3 becomes the time between the times t0 and t3 as shown in FIG.
The data is replicated during the time t7, and the time required for the data replication is shorter than the time from the time t7 when the data is replicated without performing the data compression.
It is shortened only during t3.

Next, the copying operation will be described. When duplicating an audio signal, b is selected by the input changeover switch 25 and each microcomputer is selected.
A control signal is sent from 19 to each mute circuit 24, and no audio signal is output from each audio output terminal 17. In this case, unlike the normal reproduction described above, a control signal is sent from the microcomputer 19 to the servo circuit 20 so as to continuously reproduce the signal recorded on the recorded disk 9a.

The signal recorded on the recorded disk 9a is converted into an electric signal by the optical pickup 10, and the electric signal is
Supplied to The signal amplified by the reproduction amplifier 11 is supplied to a demodulation circuit 12, where the signal is demodulated by EFM or the like and the original signal sequence is restored, and then supplied to an error control circuit 13. The error control circuit 13 corrects the error of the signal sequence by using the error correction code included in the signal sequence restored by the demodulation circuit 12, and converts the signal sequence rearranged by the interleaving process into the original sequence. return. This signal is supplied to the encoding circuit 5 via the input switch 25.

The encoding circuit 5 performs an interleaving process and a process of generating and adding an error correction code, and the next modulation circuit 6 performs modulation such as EFM. This signal is sent to a magnetic recording head 8 via a recording head driving circuit 7.
Is recorded on the recording disk 9b from this time, but at this time, a control signal is sent from the microcomputer 19 to the servo circuit 20 so as to record continuously instead of recording intermittently as in normal recording. Thus, the duplication of the audio signal is completed.

In the first embodiment, the dedicated microcomputer 19 is provided in the reproduction-only system 101.
This processing may be performed together by the microcomputer 19 of the recording / reproducing system 102. Further, although the control of each buffer memory 14 is performed by each microcomputer 19, a function instead of this may be realized by a logic circuit.

[0039]

[0040]

[0041]

[0042]

Embodiment 2 FIG . FIG. 6 is a block circuit diagram of a reproducing apparatus according to the second embodiment. In FIG. 6 , portions denoted by the same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding portions, and thus description thereof will be omitted. In addition, FIG. 6
9 is a 4-channel audio signal (A, B,
A and B) are disks on which compression recording is performed, 34 is a reproduction signal selection switch, 35a and 35b are reproduction buffer memories, 39
Is an error rate determination circuit, and 40 is a signal selection switch.

The signal R of each of the two channels which is the same signal
1, R2 are doubly recorded in different areas of one disk 9. FIG. 7 is a schematic diagram showing an area on the disk 9 where signals are recorded, in which the area A1 where the signal R1 is recorded is provided on the inner periphery and the area A2 where the signal R2 is recorded is provided on the outer periphery. It is. At the time of recording, the same signal is double-recorded in the area A1 and the area A2 on the disk 9.
The areas A1 and A2 may be provided in any manner, and if the positions of the areas on the disk 9 are determined in advance, the areas can be managed by addresses.

Next, the reproducing operation will be described. Figure 8 is a timing diagram showing a reproduction signal processing and operation of the apparatus of FIG. The optical pickup 10 for reading the signal on the disk surface is moved to reproduce the signals in the two recording areas. That is, during the period of t1, the optical pickup 10 is in the area A
1, the microcomputer 19 reads the signal R1 and stores the reproduction end address position. Then t2
During the period, the optical pickup 10 is moved to the area A2,
The signal R2 is read during the period t3, and the microcomputer 19 stores the reproduction end address position of the signal R2. t
The optical pickup 10 is moved to the area A1 again in the period 4 and the reproduction end address position of the previously stored signal R1 is searched, and the signal R1 is read in the period t5, and this is repeated.

After the signal read by the optical pickup 10 is amplified by the reproduction amplifier 11, the demodulation circuit 12 and the error control circuit 13 perform demodulation, error detection and correction, and deinterleaving. The processed signals are separately supplied to buffer memories 35a and 35b corresponding to the signals R1 and R2 by the switch 34. Further, processing information in the error control circuit 13 is output to the error rate determination circuit 39. In the error rate determination circuit 39, the reliability of the signals R1 and R2 is determined based on the processing information, and the switch 40 selects the higher reliability signal of the signals R1 and R2 according to the determination result. Is selected. The selected signal is supplied to a data decompression circuit 15, restored to a signal for two channels, and converted to an analog signal by a D / A conversion circuit 16.
Output from the audio signal output terminal 17.

As described above, in the second embodiment, the reproduction signal with the higher reliability is selected, and the selected reproduction signal is expanded to obtain the audio signal, so that the reproduction with high reliability can be performed.

In the above example, the apparatus for reproducing a compressed audio signal has been described. However, the present invention can be applied to an apparatus for reproducing an image signal and digital data.

[0049]

Since the recording apparatus and the reproducing apparatus according to the first and second aspects of the present invention are configured as described above, the following effects can be obtained. (1) Since the compressed and recorded information signal is copied without expansion, the information signal can be copied at a high speed. (2) a switch for selecting and inputting a signal which is continuously reproduced while being compressed and an intermittent signal which is compressed by a data compression means, to a device for compressing and recording / reproducing an information signal; Since it is sufficient to provide a control means for continuously recording and reproducing data recorded on the medium while compressing the data, a recording and reproducing apparatus for digital information signals can be easily constituted. (3) By providing a means for detecting the copy prohibition information in the apparatus, it is possible to determine whether or not duplication is possible depending on the presence or absence of the copy prohibition information. Can be prohibited.

[0050]

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a recording / reproducing apparatus according to the present invention.

2 is a block circuit diagram of a playback apparatus of the present invention.

FIG. 3 is a diagram showing a time change of an information amount in a buffer memory at the time of recording by the apparatus shown in FIGS.

FIG. 4 is a diagram showing a temporal change of an information amount in a buffer memory at the time of reproduction of the apparatus shown in FIGS.

FIG. 5 is a timing diagram of data replication of the apparatus shown in FIGS.

FIG. 6 is a block circuit diagram of another reproducing apparatus according to the present invention.
You.

FIG. 7 shows a recording area on a disk of the apparatus shown in FIG . 6;
FIG .

FIG. 8 is a timing chart for explaining a reproducing operation of the apparatus shown in FIG . 6;
FIG .

FIG. 9 is a block diagram of a conventional apparatus for duplicating an audio signal .
FIG .

FIG. 10 is a block diagram of a conventional recording / reproducing apparatus.
There is .

FIG. 11 is a timing diagram illustrating the operation of the apparatus shown in FIG .
FIG .

[Explanation of symbols]

1 audio input terminal, 3 data compression circuit, 8 magnetic recording head, 9a, 9b, 9 disk, 10 optical pickup, 15 data decompression circuit, 17 audio output terminal, 19 microcomputer, 25 input changeover switch, 26 duplication prohibition information detection Circuit, 39 error rate judgment circuit, 40 signal selection switch.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) The inventor, Tsukamoto Manabu, Baba Zujo, Nagaokakyo-shi, Kyoto, Japan Mitsubishi Electric Corporation, Electronic Product Development Laboratory (72) The inventor, Nobuaki Hirai, 1, Baba Zhou, Nagaokakyo-shi, Kyoto, Mitsubishi (56) References JP-A-5-225695 (JP, A) JP-A-5-342581 (JP, A)

Claims (2)

(57) [Claims] 1. A recording apparatus for recording information signals obtained by compressing the amount of information on a recording medium, a first input means for inputting an information signal that is not compressed, is input by said first input means and compressing means for compressing an information signal, a second input means for inputting the first recording control means for intermittently recording information signal compressed by said compression means in a first mode, the compressed information signal means for selecting a second recording control means for continuously recording the information signal input at said second input means in a second mode, and said first mode and a second mode Means for detecting duplication inhibition information from the compressed information signal, and outputting a signal to the second recording control means to stop recording when the duplication prohibition information is detected. 2. A reproducing apparatus for reproducing information signals recorded on the recording medium by compressing the amount of information, the reproducing intermittently an information signal recorded on the recording medium in a first mode and one regeneration control means, to the first mode
And expansion means for expanding information signal reproduced by said first reproduction control means Te, a first output means for outputting data expanded by該伸length unit, an information signal recorded on the recording medium first a second reproduction control means for continuously regenerated in second mode, and a second output means for outputting the information signal reproduced by said second reproduction control means in the second mode, the first Means for selecting a mode and a second mode, and means for detecting duplication inhibition information from the reproduced information signal and outputting a signal to the second reproduction control means to stop reproduction when detected. A playback device, comprising: