JPH11219563A - Reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reproducing device capable of easily duplicating an audio signal at a high speed and also capable of reproducing the audio signals of more than 4 channels. SOLUTION: The digital signal recorded on a recording medium by compressing is duplicated on the other recording medium without extending. The audio signal is reproduced by utilizing the information recorded on a TOC of the recording medium. The 1st information signals (audio signals of 2 channels) are intermittently reproduced to the 1st area of a disk 9, then the 2nd information signals (audio signals of other 2 channels) are intermittently reproduced from the 2nd area of the disk 9 during the period when the reproduction of the 1st information signals is not carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a reproducing apparatus for reproducing an information signal such as a digital audio signal from a recording medium.

[0002]

2. Description of the Related Art FIG. 20 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, reference numeral 43 denotes a compact disc player (hereinafter, referred to as "CD player"), and reference numeral 44 denotes 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. 21 is a block diagram of a conventional recording / reproducing apparatus. 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, and 5 is an encoding circuit for generating and adding an error correction code. Reference numeral 6 denotes a modulation circuit, 7 denotes a recording head driving circuit, 8 denotes a magnetic recording head, 9 denotes a disk, 10 denotes an optical pickup, 11 denotes a reproduction amplifier, 12 denotes a demodulation circuit, 13 denotes an error control circuit, and 14 denotes a reproduction buffer. Memory, 15 a data expansion circuit, 16 a digital / analog (D / A) conversion circuit, 17 a two-channel audio output terminal, 18 an address decoder, 19 a microcomputer, 20 a servo circuit, 21 a motor, 22 Is an input key, and 23 is a display circuit.

FIG. 22 is a timing chart showing the operation of the recording / reproducing apparatus. 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.

The compressed signal is temporarily stored in the buffer memory 4, and is intermittently read out at the same signal rate as before compression as shown in FIG. 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. 22 (c)).
As shown in FIG. 22 (d), the recording state and the recording pause state are alternately repeated, and before recording, the last address of the part recorded so far 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. 22 (e) and 22 (f), the reproduction operation and the reproduction 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. 22 (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]

By the way, even in such a recordable disc device, like a CD, a TOC (Table Of Contents) is used for searching for a program or the like.
The start time of each program is recorded in the program and can be used at the time of reproduction. However, since the user can freely record, it is more difficult to manage and operate the TOC as compared with the CD. For example, in the case of CDs, the so-called inter-song time between programs is almost constant, so that the user does not feel uncomfortable even during playback, but in the case of a recordable disc device, the inter-song time varies. During playback, a state in which a silent state between music pieces continues for a long time occurs. In addition, when additional recording is performed on an already recorded disc, efficient recording using an unrecorded portion of the disc is desired. Therefore, in this recordable disk device, it is necessary to use TOC effectively in both recording and reproduction.

Further, 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 reproduction, and the system is suitable for a portable system and a vehicle-mounted system. 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 one object of the present invention is to provide a reproducing apparatus capable of reproducing an information signal at a high speed with a simple configuration without deteriorating the quality. Is to do.

It is another object of the present invention to provide a reproducing apparatus which has good operability for a user and does not cause unnatural reproduction when reproducing a disk recorded by the user.

[0017]

According to a first aspect of the present invention, there is provided a reproducing apparatus including an information signal composed of a plurality of recording units having a predetermined size and position information of the information signal on a recording medium. In a reproducing apparatus for reproducing a disc-shaped recording medium having additional information recorded on a recording track, an information signal and additional information recorded on the recording medium are formed by forming a light spot on the recording medium. A length of a blank between a position of the information signal to be reproduced on the recording medium and a position of the next information signal to be reproduced on the recording medium, based on the reproduced additional information. And a blank detecting means for outputting a signal corresponding thereto, and, when a detection result of the blank detecting means exceeds a predetermined value, an end position of a recording unit including the information signal being reproduced. Then, the reproducing means makes a track jump to a start position of a recording unit including an information signal to be reproduced next, and if the detection result of the blank detecting means is equal to or less than the predetermined value, the information signal to be reproduced is included. And control means for controlling the reproduction means to maintain the reproduction state from the end position of the recording unit to be reproduced to the start position of the recording unit containing the information signal to be reproduced next.

In the present invention, at the time of reproduction, first, the TOC
Is read, and the address in the reproduction signal is constantly monitored. The length of the blank from the end position of the recording unit containing the information signal to be reproduced to the start position of the recording unit containing the information signal to be reproduced next is determined as follows. Since the jump operation is performed only when the value is larger than a predetermined value, efficient recording using the blank can be performed even if there is a blank, and long and short blanks are mixed. Thus, even when a disc is played back, playback can be performed with almost the same blank length, and a playback apparatus that can play back naturally for the user is obtained.

[0019]

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

Embodiment 1 FIG. 1 is a block diagram showing a configuration of a reproduction-only system according to the first embodiment, and FIG. 2 is a block diagram showing a configuration of a recording / reproduction system. Reference numeral 101 in FIG. 1 denotes a reproduction-only system applied to an optical disk such as an MD, and reference numeral 102 in FIG. 2 denotes a recording / reproduction system. In FIGS. 1 and 2, the parts denoted by the same reference numerals as those in FIG.
In FIGS. 1 and 2, reference numeral 9a denotes a recorded disk, 9b denotes a recording / playback disk, 24 denotes a mute circuit, and 25 denotes 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 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, DCT
(Discrete Cosine Transform coding)
Coding by band division, a method of reducing unnecessary information amount by using these and human auditory characteristics, and the like 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 reflects the light illuminated on the disk 9b by the reflected light.
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 the error of the signal sequence using the error correction code included in the signal sequence restored by the demodulation circuit 12, and converts the signal sequence rearranged by the interleave processing into the original sequence. Return to the order. 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 to restore 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. FIG. 5 is a timing diagram of data replication of the device shown in FIGS.
For example, at times t0 to t1, t1 to t2, and t in FIG.
When the data between 2 and t3 is compressed and recorded and read at the same signal rate as before compression, the time required for reading is as shown in FIG. 5 (b) at times t0 to t4 and t1 respectively.
To t5 and t2 to t6. When these compressed data are continuously read out at the same signal rate as before compression and are continuously recorded on the recording disk 9b, the time t0 to t3
5 (c), the audio signal sequence is duplicated between times t0 and t7, and the time required for data duplication is shorter than that between times t7 and t7 as compared with the case where the duplication is performed without 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. However, this processing may be performed by the microcomputer 19 of the recording / reproduction 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.

Embodiment 2 Embodiment 1 has a system for prohibiting unlimited copying of a digital audio signal having a copyright, for example, SCMS.
(Serial Copy Management System) or one having a function equivalent to SCMS may be adopted. 6 and 7 are block diagrams showing the second embodiment. 6 and 7, the same reference numerals as those in FIGS. 1 and 2 denote the same or corresponding parts, and a description thereof will not be repeated. In addition,
Reference numeral 26 denotes a copy prohibition information detection circuit that detects the copy prohibition information. This copy prohibition information is recorded as additional information, and is recorded in the same area as the digital audio signal or in a dedicated area for the additional information independent of the digital audio signal.

Next, the operation will be described. Recorded disc
The signal read from 9a is sent to the error control circuit 13 through the same process as in the first embodiment. The signal sequence that has been subjected to the error correction and rearranged in the original order is sent to the buffer memory 14, but the copy prohibition information in the additional information is sent to the copy prohibition information detection circuit 26. If the copy prohibition information is detected here, a control signal is sent from the copy prohibition information detection circuit 26 to the microcomputer 19, and the microcomputer 19 immediately generates a control signal to stop reproduction, and Ban.

Of course, the recording may be controlled to be stopped. Alternatively, the copy prohibition information recorded in the dedicated area of the additional information may be read in advance prior to the audio signal, and may be determined before determining whether or not duplication is possible.

In the second embodiment, the copy prohibition information detecting circuit 26 is provided.
You can go inside 19.

Embodiment 3 Next, an apparatus for recording additional information related to an information signal in the TOC and using the information during reproduction will be described below. The configuration of these devices and the basic recording / reproducing operations are the same as those of the conventional example shown in FIG. 21, but the control contents of the microcomputer 19 are slightly different.

Table 1 below shows an example of a TOC data array.

[0043]

[Table 1]

The TOC is recorded intensively in an area different from the audio signal recording area, for example, in a lead-in area. In this example, a program number, a start position of a program corresponding to each program number, and a value obtained by converting a program time of each program into an address amount are recorded in the TOC. FIG. 8 shows an example of a music arrangement on a disk. In this example, five songs A to E having program numbers (song numbers) [1] to [5] are recorded on the disc 9, and the area after that is an unrecorded portion. The hatched portion between the songs A to E is a blank between songs,
The start position information of each program on the TOC corresponds to each of the positions S1 to S5 indicated by S in FIG.

When the disk 9 is mounted on the apparatus, first, an operation of reading TOC information is performed. That is, the TOC information in Table 1 is read from the lead-in area and stored in the internal memory of the microcomputer 19. At this time, the microcomputer 19 decodes the TOC and
Is calculated and the total time is calculated and displayed on the display circuit 23. For example, 5 per address
If the time is seconds, the total number of songs is displayed as 5 and the total time is displayed as 21 minutes and 5 seconds. Actually, the addresses are more detailed, and the address is 60 or 100 per second.
Also, the blank time and the unrecorded time between music pieces are determined from the program time of each program and the start position address, and the recordable time of the disc is displayed. That is, assuming that this disc 9 is a disc capable of recording for 60 minutes, the recordable time is displayed as 39 minutes 55 seconds.

Next, the recording sequence will be specifically described. FIG. 9 is a flowchart of the recording sequence. In this example, there is a case where it is desired to erase a part of the already recorded music and to record a new music there. At this time, TO
After reading the C information (P1), the user first designates a song number which does not need to be stored and which is to be deleted by key input 22 (P2). For example, when rewriting the program D in Table 1 with a new song, the song number [4] is designated. The microcomputer 19 knows the start position S4 = 137 of the music number [4] from the TOC read in advance (P3),
The recording head and the optical pickup jump and stand by so that recording can be started from that position (P4). Then, the recording is started at the same time as the recording key operation (P5) by the user. During recording, the address of the disc guide groove is monitored for reproduction (P6). If the recording stop operation is performed before reaching the end position E4 = 230 calculated by the program time of the track number [4] (P7: YES), the program time is obtained from the address of the recording stop position, and a new track number [ The information in the internal memory of the microcomputer 19 is updated as the program time of [4], and the TOC on the disk is rewritten to the latest one (P12).

On the other hand, if the end position E4 of the track number [4] is reached during recording (P8: YES), the program jumps from that position to the start position Ua = 293 of the unrecorded area, and this position Ua The recording is continued from (P9). This start position Ua
Can be obtained from each program time. When the recording stop operation is performed (P10), the microcomputer 19 stores the address position of the stop.
Then, the program time of this part is obtained from the position Ua and the stopped address position, and the TOC on the disk is calculated as follows:
This information is added (P11).

However, since this recording portion is a continuation of the music number [4], it is preferable that this can be immediately identified on the TOC during reproduction. Therefore, when the marking indicating that the area of the music number [4] is divided into a plurality of places, for example, the marking is 1, information indicating that there is a continuation part of the music number may be recorded in the TOC.

A recording sequence shown in FIG. 10 will be described as another recording method. In this example, a new recording is desired to be performed without erasing the already recorded music. After reading the TOC information (P21), when the user operates the recording key (P22), the microcomputer 19 determines the start position Ua of the unrecorded area from the TOC information in the internal memory as shown in Table 1. Then, the address position on the disk is searched (P23). Then, recording or a recording pause state is set from the address position (P24). After the recording is stopped and the recording is completed (P25), the program time is written to the TOC in correspondence with the program number following the program number [5] of the already recorded music (P2).
6).

FIG. 11 shows a recording sequence using a blank portion between music pieces. This example is also a recording method in a case where a new recording is desired to be performed without erasing the already recorded music, and recording can be performed more efficiently than in the fourth embodiment. After reading the TOC information (P31), the microcomputer 19 reads the TOC information.
Then, a blank portion between music pieces is determined (P32), and it is determined whether there is a sufficient area for recording the length of the blank (P33). For example, if there is an inter-track blank of 20 seconds or longer, the setting is made to record there. Since 20 seconds is equivalent to 4 in the address, the microcomputer 19
When the address difference T between the end position of the program and the start position of the next program is t = 4 or more, it is determined that the area is a recordable area. In the case of the example of Table 1, only the space between the music numbers [4] and [5] corresponds to this, and this recordable area is registered (P34).

Therefore, when the user operates the recording start key (P35), the end position E of the track number [4] on the disc 9 is determined.
Then, control is made to search for No. 4 and recording is started from that position (P36). After recording to the start position S5 of the track number [5] (P37: YES), the CPU jumps to the start position Ua of the unrecorded area and continues recording (P38). After the recording is stopped and the recording is completed (P39), the program number [4] and the music number [5] are associated with the program number [6] following the program number [5] of the already recorded music. The program time and the above-described markings are written in the TOC as the first portion recorded in the tune and the second portion recorded in the unrecorded area (P40). If there are a plurality of inter-track blanks, recording is sequentially performed in that area.

In the recording sequence shown in FIG. 11, the determination of the recordable area is performed before the start of recording using the TOC read prior to the recording, but may be performed after the recording key is operated. In addition, when there are a plurality of recordable areas, the order of recording from which area is not limited. For example, the order of the program number, the order of the length of the area, and the like can be appropriately determined.

In any of the above-described embodiments, the recording time is subtracted from the recordable time displayed before recording, and this time can be displayed to notify the user.

Next, the reproduction sequence will be specifically described. FIG. 12 shows a flowchart of the reproduction sequence. Before playing the audio signal, the TOC is read in advance (P41), and the user operates the playback key (P42).
When the disc is being reproduced, the reproduction address is monitored (P43). When the user operates the reproduction stop key (P44: YES), the operation is stopped (P46). If the reproduction stop key is not operated (P44: NO) and the program reaches the end position, the program jumps to the start position of the next program to be reproduced (P45) and the reproduction is continued. In other words, when no music is continuously recorded on the disc and there is a gap between the end position of a certain music and the start position of the next music, the reproduction is performed while skipping this portion.

Further, the skip operation is not always performed, and the microcomputer 19 reads T
The length of the inter-music blank may be determined by the OC, and control may be performed so as to jump only when the length of the blank is equal to or longer than a predetermined value, for example, 3 seconds or longer.

Next, a recording / reproducing sequence for allowing a user to freely set a portion to be cut and reproduced will be described. For example, in Table 1 and FIG. 8, it is assumed that the reproduction of the part from the middle of the program D to the end of the program D is to be cut next. The user searches for the part to be cut before or after the part to be cut by searching or normal reproduction. Then, a position to be cut is designated by key input while being reproduced. The microcomputer 19 calculates the program number [4] corresponding to the program D from the address at this position.
To rewrite the program time. At the time of reproduction, by performing the above-described reproduction operation of skipping between music pieces, reproduction from the position designated by the user to the beginning of the next music piece is cut. In addition, by allowing the user to freely input the program start position, an arbitrary portion can be reproduced and cut.

In the recording sequence shown in FIGS. 9, 10, and 11, the jump operation to the recording start position may be performed before or after the operation of the recording key.

Further, in the above invention, the program start position and the program time are associated with the program number by T
Although described in the OC, the present invention is not limited to this. For example, a similar effect can be obtained by writing a program start position and an end position. Furthermore, in each of the above embodiments, a device for recording / reproducing a compressed audio signal has been described. However, the present invention can be applied to a device for recording / reproducing digital data such as an image signal and a computer. It can be applied even when it does not depend on. It should be noted that the numerical values such as addresses used in the description are merely examples, and it is needless to say that the present invention is not limited to this.

Embodiment 4 FIG. FIG. 13 is a block diagram showing a configuration of a four-channel audio signal recording / reproducing apparatus according to the fourth embodiment. In FIG. 13, the parts denoted by the same reference numerals as those in FIGS. In FIG. 13, reference numeral 31 denotes a four-channel audio signal input terminal, 32a and 32b denote recording buffer memories, 33 denotes a recording signal selection switch, 34 denotes a reproduction signal selection switch, 35a and 35b denote reproduction buffer memories, and 36 Is a 4-channel audio signal output terminal.

FIG. 14 is a timing chart showing the recording signal processing and operation of the apparatus of FIG. Based on FIGS. 13 and 14,
First, the recording operation of a 4-channel audio signal will be described. The four-channel analog audio signals supplied to the audio signal input terminal 31 are sampled by the A / D conversion circuits 2a and 2b for every two channels and are converted into digital signals. The digital signals are subjected to voice compression encoding processing in data compression circuits 3a and 3b, respectively, and the compressed signals for every two channels are temporarily stored in buffer memories 32a and 32b, respectively.

The signals read out intermittently from the two buffer memories 32a and 32b are shown in FIG.
As shown in (b), control is performed so that reading from another memory is prohibited while data is being read from one memory. The switch 33 is alternately switched in accordance with a period during which signals are read from the two buffer memories 32a and 32b, and two compressed signals are alternately obtained as an output of the switch 33. That is, R shown in FIG.
1, R2 are signals obtained alternately. This signal is subjected to interleaving processing, error correction code generation / addition processing, and EFM modulation in the encoding circuit 5 and modulation circuit 6, and is supplied to the magnetic recording head 8 via the recording head drive circuit 7.

Each of the signals R1 and R2 of two channels
Are recorded in different areas of one disk 9. Fig. 15
FIG. 3 is a schematic diagram showing an area where a signal is recorded on the disk 9, in which an area A1 where a signal R1 is recorded is provided on an inner periphery and an area A2 where a signal R2 is recorded is provided on an outer periphery. . 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.

The positions of the magnetic recording head 8 and the optical pickup 10 for performing recording are determined by signals to be recorded by R1 and R2.
Is controlled to be the area A1 or the area A2. That is, the signal R1 is
During the period of t1, the magnetic recording head 8 and the optical pickup 10 are positioned in the area A1 to perform recording, and
The microcomputer 19 stores the recording end address position. When the signal of R1 is completed, the recording current is stopped, and the magnetic recording head 8 and the optical pickup 10 are moved to the area A2 for a period of t2 to wait. Then, a recording current is applied during a period of t3 when the signal R2 is supplied to the magnetic recording head 8 to perform recording, and the microcomputer 19 stores the recording end address position of R2. When the signal of R2 is completed, the recording current is stopped, and the magnetic recording head 8 and the optical pickup 10 are moved again to the area A1 during the period of t4, and the previously stored recording end address position of R1 is searched for standby. I do.

In the next R1 signal supply period t5, recording is performed following the previous recording portion, and the recording end address position is updated. Thus, in correspondence with the signals R1 and R2,
By moving the magnetic recording head 8 and the optical pickup 10,
Signals are continuously recorded in each area using the address signal. At this time, disk rotation servo and tracking servo are applied so that recording can be performed correctly in each area.

Next, the reproducing operation will be described. FIG. 16 is a timing chart showing the reproduction signal processing and operation of the apparatus of FIG. At the time of reproduction, as in the case of recording, the optical pickup 10 for reading the signal on the disk surface is moved to reproduce the signals of the two recording areas. That is, during the period of t1, the optical pickup 10 is located in the area A1, reads the R1 signal, and the microcomputer 19 stores the reproduction end address position. Next, during the period of t2, the optical pickup
10 is moved to the area A2, the signal of R2 is read during the period of t3, and the microcomputer 19 stores the reproduction end address position of R2. Optical pickup again during t4
10 is moved to the area A1, the previously stored reproduction end address position of R1 is searched, and the R1 signal is read during 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 deinterleave processing. The processed signals are separately supplied to buffer memories 35a and 35b corresponding to R1 and R2 by a switch 34. Buffer memory
The signals read from 35a and 35b are the data decompression circuits 15a and 1
5b, the signals are restored to continuous signals for two channels, respectively, converted into analog signals by the D / A conversion circuits 16a and 16b, and then output from the audio signal output terminal 36.

As described above, in the fourth embodiment, 4
Although the recording / reproduction of the audio signal of the channel is possible, the recording / reproduction of four or more channels can be performed by further shortening the search time. In addition, two 2-channel stereo sources or multi-lingual recording / reproduction can be performed without being limited to 4-channel audio signals.

Embodiment 5 FIG. 17 is a block diagram of a playback device according to the fifth embodiment. In FIG. 17, FIG.
2, the parts denoted by the same reference numerals as those in FIG. 13 indicate the same or corresponding parts, and therefore description thereof will be omitted. In FIG. 17, reference numeral 37 denotes a mixing circuit, and reference numeral 38 denotes a reproduction mode control circuit. Signal reading from the disk 9 is performed in the same manner as in the fourth embodiment, and two 2-channel signals are reproduced. Now, the four-channel signals recorded on the disk 9 are A, B, C, and D, respectively. For example, A and B only record music performance, and C and D record only vocals corresponding to this performance. I do. In the first reproduction mode of the present apparatus, the four-channel signals restored by the data decompression circuits 15a and 15b are input to a mixing circuit 37 and mixed every two channels.
Two channels A + C and B + D are generated. And A
+ C and B + D are respectively D / A converted and returned to analog signals for reproduction. Therefore, music in which the performance and the vocals are mixed is reproduced.

When the second reproduction mode is designated by the reproduction mode control circuit 38, the mixing circuit 37 does not perform the mixing process and selects and outputs either A and B or C and D. Therefore, if you select A and B,
Only music performances can be reproduced and used for karaoke accompaniment.

In the fifth embodiment shown in FIG. 17, mixing is performed with a digital signal before D / A conversion, but mixing may be performed after returning to an analog signal.

Embodiment 6 FIG. FIG. 18 is a block diagram showing a configuration of the sixth embodiment. In the present embodiment, the above functions are used for improving the reliability of the device.
In FIG. 17, portions denoted by the same reference numerals as those in FIGS. 1, 2, and 13 indicate the same or corresponding portions, and thus description thereof will be omitted. Also,
39 is an error rate judgment circuit, and 40 is a signal selection switch. At the time of recording, the same signal is double-recorded in the area A1 and the area A2 on the disk 9. At the time of reproduction, FIG.
(C) The reliability of the reproduced signals R1 and R2 is determined by the error rate determination circuit 39, and the signal with the higher reliability of R1 and R2 is selected by the signal selection switch 40 and supplied to the data decompression circuit 15. I do. Therefore, highly reliable reproduction can be performed.

Embodiment 7 FIG. In the description of the fourth embodiment shown in FIG. 13, the area A1 and the area A2 are recorded or reproduced in a time division manner. However, the reproduction of the area A1 and the recording of the area A2 are performed in a time division manner. Can also. For example,
For the purpose of language learning, the voice of the teacher is recorded in the area A1, and the user's voice is recorded in the area A2 while listening to the reproduced sound. In this case, in the block diagram of FIG.
3 and 34 are all turned upside down. FIG. 19 shows a timing chart at this time. The recording signal shown in FIG.
The basic processing is the same as that described in the fourth embodiment, except that the reproduction and recording processes are performed so that the open period of the reproduction signal shown in FIG.

As an application example of the recording / reproducing apparatus, for example, a mixing circuit for mixing a signal reproduced from the disk 9 and a signal input from the outside is provided, and the mixed signal is recorded in another area of the disk. You may.

As another application example, after a signal reproduced from the disk 9 is subjected to processing such as equalizing,
The information may be recorded in another area of the disc.

Although the above embodiments 4 to 7 have described devices for recording and reproducing compressed audio signals, the present invention is also applicable to devices for recording and reproducing image signals and digital data.

[0076]

Since the reproducing apparatus according to the present invention is configured as described above, at the time of reproduction, the address in the reproduction signal is always monitored, and the recording unit containing the information signal being reproduced is included. The jump operation is performed only when the blank length between the end position and the start position of the recording unit containing the next information signal to be reproduced is larger than a predetermined value. This makes it possible to perform efficient recording, and even when playing a disc that has both long and short blanks, playback can be performed with almost blanks, and natural playback for the user is possible. A playback device that can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment.

FIG. 2 is a block diagram illustrating a configuration of a recording / reproducing system.

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 diagram showing a configuration of a second embodiment.

FIG. 7 is a block diagram showing a configuration of a second embodiment.

FIG. 8 is a diagram showing a program array on a disc corresponding to TOC contents.

FIG. 9 is a flowchart illustrating a recording sequence.

FIG. 10 is a flowchart illustrating another recording sequence.

FIG. 11 is a flowchart illustrating still another recording sequence.

FIG. 12 is a flowchart illustrating a reproduction sequence.

FIG. 13 is a block diagram showing a configuration of the fourth embodiment.

14 is a timing chart for explaining a recording operation of the apparatus shown in FIG.

FIG. 15 is a diagram showing a recording area on a disk of the apparatus shown in FIG.

FIG. 16 is a timing chart for explaining a reproducing operation of the apparatus shown in FIG. 13;

FIG. 17 is a block diagram showing a configuration of the fifth embodiment.

FIG. 18 is a block diagram showing a configuration of the sixth embodiment.

FIG. 19 is a timing chart illustrating a recording / reproducing operation according to the seventh embodiment.

FIG. 20 is a block diagram of a conventional apparatus for duplicating an audio signal.

FIG. 21 is a block diagram of a conventional recording / reproducing apparatus.

FIG. 22 is a timing chart showing the operation of the device shown in FIG. 21.

[Explanation of symbols]

8 magnetic recording head, 9a, 9b disk, 10 optical pickup, 18 address decoder, 19 microcomputer, 20 servo circuit, 21 motor, 22 input keys,
23 display circuit, 26 duplication prohibition information detection circuit, 32a, 32b,
35a, 35b buffer memory, 33 recording signal selection switch, 34 playback signal selection switch, 37 mixing circuit,
39 Error rate judgment circuit.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) The inventor, Manabu Tsukamoto, 1 Baba Zhousho, Nagaokakyo-shi, Kyoto, Japan Mitsubishi Electric Corporation Electronic Products Development Laboratory (72) The inventor, Nobuaki Hirai 1st, Baba Zhoujo, Nagaokakyo, Kyoto, Japan Mitsubishi Electric Inside Electronic Product Development Laboratory Co., Ltd.

Claims (1)

[Claims] 1. A disk in which an information signal composed of a plurality of recording units having a predetermined size and additional information including position information of the information signal on a recording medium are recorded on a recording track. A reproducing device that reproduces an information signal and additional information recorded on the recording medium by forming a light spot on the recording medium, based on the reproduced additional information. Blank detecting means for detecting the length of a blank between the position of the information signal being reproduced on the recording medium and the position of the information signal to be reproduced next on the recording medium, and outputting a signal corresponding thereto. If the detection result of the blank detecting means exceeds a predetermined value, the recording unit including the information signal to be reproduced next from the end position of the recording unit including the information signal to be reproduced. The playback unit makes a track jump to the start position of the position, and when the detection result of the blank detection unit is equal to or smaller than the predetermined value, the next reproduction is performed from the end position of the recording unit including the information signal being reproduced. A control unit for controlling the reproduction unit to maintain a reproduction state until a start position of a recording unit including an information signal.