JPH0877705A - Tape duplicating device - Google Patents

Abstract

PURPOSE: To efficiently duplicate many varieties of a small number of tapes by simplifying a process for making a master tape in which signals to be duplicated in a copy tape are recorded. CONSTITUTION: Signals to be copied are reproduced from tape reproducing units 7 and 8 as digital signals and recorded in a magnetic disk 18. Then, these are read from the magnetic disk 18 and recorded in a memory unit 19. Then, these are read from the memory unit and recorded in a copy tape 50. The length of a signal on an A surface and that of a signal on a B surface are compared on the magnetic disk 18 or the memory unit 19 and a false signal C is added to the shorter signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape duplication device which can be used when a large amount of audio signals are duplicated on a magnetic tape.

[0002]

2. Description of the Related Art A tape duplicator is used for recording a program such as music on a cassette tape for mass distribution. The tape duplication device reproduces a master tape on which a signal is recorded in advance and records the reproduced signal on an unrecorded magnetic tape (hereinafter referred to as a copy tape).

The tape duplication device needs to record the signal reproduced from the master tape on the copy tape at a high speed in order to increase the production capacity. A typical tape duplication device is
When the reproduction speed of the copied copy tape by the reproduction device is 1, the signal is recorded on the copy tape at a speed of 16 to 128 times. On a commercially available music tape, signals are recorded in the reciprocating direction of the A side and the B side. Furthermore, a commercially available music tape has two tracks on the A side and two tracks on the B side, and one tape has four signal tracks. Looking at a part of the tape, the signal recording directions of the A side and the B side are opposite to each other. The tape duplicator records the A side and the B side at the same time. The signal corresponding to side A is recorded in the forward direction (reproduction direction), and the signal corresponding to side B is recorded in the reverse direction (direction opposite to the reproduction direction). Therefore, when recording at a speed of 16 to 128 times, a tape generally called for 60 minutes can be copied in 113 to 15 seconds per tape.

A conventional tape duplicator is USP 4,35
There is known a tape duplicating apparatus described in US Pat. The tape duplication device described here temporarily accumulates the signal reproduced from the master tape on the magnetic disk,
A signal recorded on a magnetic disk is read at high speed and recorded on a copy tape. Since the device described here is configured to read the signal for recording on the copy tape from the magnetic disk, there is no need to reproduce the master tape at high speed, and the master tape can be reproduced only once. Good. Therefore, damage to the master tape can be minimized. In addition, the tape duplication device described here is equipped with a semiconductor memory between the magnetic disk and the recording portion of the copy tape.

In addition, Japanese Patent Laid-Open No. 2-177060 (G11B)
20/00) and U.S. Pat. No. 4,410,917, the tape duplication device temporarily records all signals reproduced from the master tape in a semiconductor memory. The device described here can record a signal on a copy tape at high speed by reading the signal recorded on the semiconductor memory at high speed. The device described here is capable of stable operation because it has no mechanical portion when reproducing a signal to be recorded on a copy tape.

[0006]

The conventional tape duplicating apparatus has a problem that the process of making a master tape on which a signal to be duplicated on a copy tape is recorded is complicated. This is because the conventional tape duplication device does not have a mechanism that rationalizes the process of creating a master tape. That is, in the conventional tape duplication device, the master tape must be created so as to correspond exactly to the image of the signal recorded on the copy tape. The process of making a master tape for use in a conventional tape duplication device requires a lot of time, so that the efficiency of the entire system is remarkably reduced, especially in the case of duplicating a large number of small quantities. The present invention is to provide a tape duplication device in which the process of producing a master tape is rationalized.

[0007]

DISCLOSURE OF THE INVENTION The present invention is an improvement of a conventional tape duplicating device, and a master reproducing means for reproducing a signal recorded on a master medium such as a tape as a digital signal, and a master reproducing means. First storage means composed of a magnetic disk or the like for recording a digital signal and reproducing the recorded digital signal, and a semiconductor memory for recording the digital signal reproduced from the first storage means and reproducing the recorded digital signal And a recording means for recording the digital signal reproduced from the second storage means on a copy tape.

[0008]

By taking the above means, the signal recorded on the master medium is first transferred from the master reproducing means to the first storage means, and then from the first storage means to the second storage means. It is transferred and finally transferred from the second storage means to the recording means to be recorded on the copy tape. With such a configuration, the step of transferring the digital signal from the master reproducing means to the first storage means and the step of transferring the digital signal from the second storage means to the recording means can be independently performed. As a result, it is possible to transfer the next digital signal from the master-playback means to the first storage means while transferring the digital signal from the second storage means to the recording means. Further, the signal can be processed before the signal reproduced from the master medium is recorded on the copy tape. For processing the signal, for example, the signal reproduced from the master medium is
It is classified into the signal for the plane and the signal for the plane B, and the signal for the plane A and the signal for the plane B
In this processing, the temporal length of the signal for the plane is made uniform, and one of the signal for the plane A and the signal for the plane B can be reproduced in the opposite direction. The processing of these signals is performed on the first storage means and the second storage means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the overall construction of an embodiment of the present invention. Reference numeral 1 is a master reproducing means. The master reproducing means 1 reproduces the signal recorded on the master medium as a digital signal. 2 is a first storage means. The first storage means 2 records the digital signal transferred from the master reproducing means 1 and reproduces it as necessary. 3 is a second storage means. Second
The storage means 3 of 1 records the digital signal transferred from the first storage means 2 and reproduces it as necessary. Reference numeral 4 is a recording means. The recording unit 4 records the digital signal transferred from the second storage unit 3 on an unrecorded medium. Reference numeral 5 is a controller. The substance of the controller 5 is a program and a computer that executes the program. Master reproduction means 1, first storage means 2, second storage means 3, recording means 4
The controller 5 and the controller 5 are connected by a system bus 6. The digital signal reproduced from the master reproducing means 1 is transferred to the first storage means through the system bus 6. The digital signal reproduced from the first storage means 2 is transferred to the second storage means through the system bus 6. The signal reproduced even from the second storage means 3 is transferred to the recording means 4 through the signal path 70.

FIG. 2 is a block diagram showing the configuration of the master reproducing means 1, the first storage means 2 and the controller 5. 7 is a first tape reproducing unit, and 8
Is a second tape reproducing unit. The tape reproducing units 7 and 8 are commercially available as digital tape recorders. The tape reproducing units 7 and 8 reproduce the digital signals recorded on the tape. Further, the tape reproducing units 7 and 8 simultaneously reproduce the control signal recorded together with the digital signal. The control signal is, for example, a signal called control ID and is a signal indicating the start position of the digital signal. The transmission format of the digital signal and the control signal reproduced from the tape reproducing units 7 and 8 is defined in the standard for standardization. The digital signals output from the tape reproducing units 7 and 8 are 16 bits per sample and the sampling frequency is 44.1 kHz.
z. The tape reproducing units 7 and 8 output digital signals as serial data. 9 is a serial / parallel conversion unit. The serial / parallel conversion unit 9 converts the transmission form of the digital signal output from the tape reproduction unit 1 from serial transmission to parallel transmission. 10 is a buffer memory. The buffer memory 10 temporarily stores the digital signal output from the serial / parallel conversion unit 9 in order to output the digital signal to the outside of the master reproducing means 1. 11
Is an ID decoding unit for demodulating the control ID from the signal output from the reproducing unit 7.
Reference numerals 12, 13, and 14 are a serial / parallel conversion unit, a buffer memory, and an ID decoding unit for the second tape reproducing unit 8. The configuration and function of each unit is the same as the unit for the first tape reproducing unit 7. Reference numeral 15 is a bus interface unit. Bus interface unit 15
Interface between the master reproducing means 1 and the system bus 6.

The controller 5 comprises a control unit 16 and an operation panel 17. The operation panel 17 includes operation switches for controlling the entire components connected to the system bus 6 and a display unit for displaying the state of each component. Control unit 1
Reference numeral 6 controls the entire master reproducing means 1 and the components connected to the system bus 6 based on the operation result of the operation panel 17. Control unit 16
Controls the operation modes of the first and second tape reproducing units 7 and 8 through the control lines T1 and T2. Further, the buffers 10 and 13 are controlled through the control lines B1 and B2. Further, the control unit 16 outputs digital signal data and control data to the system bus 6 and receives digital signal data and control data from the system bus 6 through the interface unit 15 connected to the control line I.

The first storage means 2 is realized by a magnetic disk 18. The magnetic disk 18 includes an interface of the system bus 6. The magnetic disk 18 stores digital signal data transferred through the system bus 6 according to an instruction from the controller 5, and outputs the digital signal data to the system bus 6. Although the magnetic disk 18 depends on the content of the tape to be duplicated, if one sample is 16 bits and the sampling frequency is 44.1 kHz, 60 signals of 2 channels are transmitted.
A storage capacity of about 600 Mbytes is required to perform duplication corresponding to the minutes.

FIG. 3 is a block diagram showing the configuration of the second storage means 3. Reference numeral 19 is a memory unit. The memory unit 19 is composed of four memory arrays indicated by 20, 21, 22, and 23. Each of the four memory arrays 20, 21, 22, and 23 is a semiconductor memory of 150 Mbytes, each word having 16 bits. Four
One memory array 20, 21, 22, 23 is divided into two groups. The first group is the memory array 2
0, 21 and the second group is the memory array 22,
23. Reference numeral 24 is a buffer memory unit. The buffer memory unit 24 includes four memory arrays 2
Four buffer memories 25, 26, 27, 28 are provided corresponding to 0, 21, 22, 23. The buffer memory unit 24 temporarily holds the digital signal output from the memory unit 19. 29 is digital /
It is an analog conversion unit. The digital / analog conversion unit 29 is a unit that converts a digital signal into an analog signal. Digital / analog conversion unit 2
Reference numeral 9 denotes four digital / analog conversion circuits 30, 3 corresponding to the four buffer memories 25, 26, 27, 28.
1, 32, 33 are provided. Reference numeral 34 is a buffer amplifier unit. The buffer amplifier unit 34 includes four buffer amplifiers 35, 36, 37 and 38. The four buffer amplifiers are analog amplifiers,
Digital / analog conversion circuits 30, 31, 32, respectively
And 33. With the above configuration, the digital signal output from the memory unit 19 is converted into an analog signal by the digital-analog conversion unit 29 after the timing is adjusted by the buffer memory unit 24. Digital / analog conversion unit 29
The digital signal converted into the analog signal by the output terminal 39, 4 through the buffer amplifier unit 34.
It is output as an analog signal of 4 channels from 0, 41 and 42. Reference numeral 43 is a storage controller that controls the entire second storage means 3.

Reference numeral 44 is an interface unit, and 45 is a memory control unit. The interface unit 44 is the storage controller 4
Under the control of 3, digital signals are transferred from the system bus 6 to the memory unit 19. The memory control unit 45 controls the memory unit 19 and the buffer memory unit 2 under the control of the storage controller 43.
4 and the digital / analog conversion unit 29 are controlled. The memory control unit 45 controls read / write and address control of the memory unit 19. Further, the memory control unit 45 controls the read / write timing of the buffer memory unit 24, and controls the four buffer memories 25, 26, 27,
The timings of the digital signals output from 28 are aligned. Further, the memory control unit 45 provides a clock signal to the digital / analog conversion unit 29.

FIG. 4 is a block diagram showing the structure of the recording means 4. The recording means 4 shown in FIG. 4 shows only an analog signal recording system, and the copying tape running system and the interface between the running system and the system bus 6 are omitted. In the configuration of the tape duplication device shown in FIG.
Usually, several recording means 4 are connected in parallel. 46,
47, 48 and 49 are analog signal buses, which are connected to the output terminals 39, 40, 41 and 42 of the buffer amplifier unit 34 shown in FIG. 3, respectively. 50 is a copy tape. Reference numerals 51, 52, 53 and 54 are fixed heads. The copy tape 50 has fixed heads 51, 5
It moves in the direction of arrow 55 with respect to 2, 53 and 54. Reference numerals 56, 57, 58 and 59 denote recording circuits. The recording circuits 56, 57, 58 and 59 drive the fixed heads 51, 52, 53 and 54, respectively, and record the analog signals sent from the analog signal buses 46, 47, 48 and 49 on the copy tape 50. Recording tracks 60, 61, 62 and 63 are formed on the surface of the copy tape 50 after the fixed heads 51, 52, 53 and 54 have passed. Recording tapes 60 and 61 are copy tapes 50
If it is the A-side track, the recording tracks 62, 63
Becomes the B side track. Also, track 6 on side A
The directions of the analog signals recorded on 0 and 61 are opposite to the directions of the analog signals recorded on the tracks 62 and 63 on the B side.

FIG. 5 shows the master reproducing means 1 shown in FIG.
9 shows digital signals recorded in the first tape reproducing unit 7 and the second tape reproducing unit 8. A shown in FIG. 5 is a first digital signal A reproduced from the first tape reproducing unit 7, and B is a second digital signal B reproduced from the second tape reproducing unit 8. The digital signal A includes information of analog signals for two channels recorded on the tracks 60 and 61 on the A side shown in FIG. 4, and the digital signal B is a track 6 on the B side.
2 and 63, the information of analog signals for two channels is included. Digital signal A is digital signal A
It is composed of a control signal ID-A1 indicating the start position, an ID-A2 indicating the end position, and a digital signal body starting from BA and ending at EA. BA to E
The digital signal up to A has a time length of T1 or T2 when converted into an analog signal. Digital signal B
Is the control ID of the digital signal B, ID-B
1 and ID-B2, and a digital signal body starting from BB and ending at EB. The digital signal from BB to EB has a time length of T3 or T4 when converted into an analog signal.

FIG. 6 shows a recording state of digital signals in the first storage means 2 shown in FIG. The first storage means 2 stores the digital signal A in the first
, And the digital signal B is recorded as a second group in a separable manner. In the example shown in FIG. 6, the length of the digital signal A is T1 to T2, the digital signal B is T3 to T4, and the digital signal A is longer than the digital signal B. In such a case, the control unit 16 adds the pseudo signal C from T4 to T5 of the digital signal B to the second storage means. Digital signal B with pseudo signal C added
Is from T3 to T5, which is the same as the length of the digital signal A from T1 to T2.

Next, the operation until the digital signal reproduced from the master reproducing means 1 is recorded in the first storage means 2 will be described. In FIG. 2, in order to transfer a signal from the tape reproducing units 7 and 8 to the first storage means 2, a transfer instruction is given to the control unit 16 via the operation panel 17. Then, the control unit 16 controls the tape reproducing units 7 and 8 to perform the reproducing operation. When the tape reproducing units 7 and 8 start operating, first, ID-A1 and ID- shown in FIG.
B1 is reproduced. ID decoding units 11 and 14
Detects the respective control IDs and sends them to the control unit 16. Then, the serial / parallel conversion units 9 and 12 start operating from BA and BB at the beginning of the digital signal. The control unit 16 controls the buffer memories 10 and 13, the bus interface unit 15 and the first storage means 2 to record the digital signals output from the serial / parallel conversion units 9 and 12 in the second storage means. . When the ID decoding unit 11 detects the second ID of the digital signal A, ID-A2, the control unit 16 stops the tape reproducing unit 7 and ends the recording of the digital signal A. Further, in the control unit 16, the ID decoding unit 14 is ID-B2 which is the second ID of the digital signal B.
When the tape signal is detected, the tape reproducing unit 8 is stopped and the recording of the digital signal B is ended.

The control unit 16 includes a time adjusting means. The time adjustment means is the control unit 1
It is realized as a program of 6. The control unit 16 compares the time lengths of the digital signal A and the digital signal B reproduced from the tape reproducing units 7 and 8 and recorded in the first storage unit 2 by the program constituting the time adjusting means. Then, the pseudo signal C is added to the shorter digital signal, and both digital signals are adjusted to have the same length. The pseudo signal C is preferably a signal having an output level of zero when converted into an analog signal or a noise signal having a sufficiently low output level when converted into an analog signal.

FIG. 7 shows a recording state of digital signals in the second storage means 3. The control unit 16 shown in FIG. 2 transmits the digital signal recorded in the first storage means 2 shown in FIG. 2 via the system bus 6 to the second storage shown in FIG. 3 according to an instruction from the operation panel 17. Transfer to means 3. The second storage means 3 shown in FIG.
In accordance with an instruction from 6, the digital signal sent through the system bus 6 is recorded in the memory unit 19. At this time, the storage controller 43 controls the interface unit 44 and the memory control unit 45. The memory control unit 45 is
Write control and memory address control of the memory arrays 20, 21, 22 and 23 of the memory unit 19 are performed.

In the first storage means, the digital signal A
The signals for the two channels recorded as are separated into the channels A1 and A2 and are recorded in the memory array 20 and the memory array 21 shown in FIG. 3, respectively. In addition, the signals of two channels recorded as the digital signal B in the first storage means 2 are separated into the channels B1 and B2, and the memory arrays 22 and
It is recorded in the memory array 23. The directions of the digital signal A and the digital signal B recorded in the second storage means 3 are different. That is, the digital signal A changes from BA to E.
When recorded toward A, the digital signal B
First, the pseudo signal C is recorded, and after that, it is recorded from BE to BB. When the recording of the digital signal is completed in the memory unit 19 of the second storage means 3, the second storage means 3 stands by for the reproducing operation.

The control unit 16 shown in FIG.
When the second storage means 3 and the recording means 4 are ready, the second storage means 3 and the recording means 4 are operated by an instruction from the operation panel 17. The memory control unit 45 of the second storage means 3 controls reading of the memory arrays 20, 21, 22 and 23 and control of addresses. Digital signals A1 and A2 shown in FIG.
And B1 and B2 are sequentially read from the memory arrays 20, 21, 22 and 23 from T1 to T2. The digital signal read from the memory unit 19 is input to the buffer memory unit 24. The write timing of the buffer memories 25, 26, 27 and 28 of the buffer memory unit 24 is synchronized with the read timing of each of the memory arrays 20, 21, 22 and 23 of the memory unit 19. Buffer memory 25,
The read timings of 26, 27, and 28 are the digital signals A1, A2, B1, B of each channel shown in FIG.
The memory control unit 45 adjusts so that the phase of 2 does not shift. Buffer memory unit 24
The digital signal whose phase has been aligned with is converted into an analog signal by the digital / analog conversion unit 29, and the recording means 4 shown in FIG.
Is supplied to.

The controller 5 of the tape duplication device shown in FIG. 1 individually controls the master reproducing means 1, the first storage means 2, the separated second storage means 3 and the recording means 4. Therefore, the operation of reproducing a certain program from the second storage means 3 and recording it in the recording means 4, and reproducing another program from the master reproducing means 1,
It is possible to simultaneously perform the operation of recording in the first storage means 2. In addition, in order to transfer a digital signal from the master reproducing means 1 to the first storage means 2,
The system bus 6 is used as the transmission path of the above, and the signal path 70 is used as the second transmission path to transfer the signal from the second storage means 3 to the recording means 4. Therefore, the transfer of the signal from the master reproducing means 1 to the first storage means 2 and the transfer of the signal from the second storage means 3 to the recording means 4 may be completely asynchronous because no conflict occurs. Moreover, each transfer rate does not depend on the transfer rate of the transfer path, and the optimum transfer rate can be selected. Specifically, the transfer speed of the signal from the master reproducing means 1 to the first storage means 2 is
The normal reproduction speed is the same as 1 × speed, the transfer speed from the first storage means 3 to the second storage means 3 is 10 × speed, and the transfer speed from the second storage means 3 to the recording means 4 is 64 × speed. It is possible to It should be noted that the same system bus 6 is used as a transmission path for the signal transfer from the master reproducing means 1 to the first storage means 2 and the signal transfer from the first storage means 2 to the second storage means 3. . However, in the normal state, the transfer of the signal from the master reproducing means 1 to the first storage means 2 and the transfer of the signal from the first storage means 2 to the second storage means 3 occur at the same time. There is no. Therefore, the transfer of the signal from the master reproducing means 1 to the first storage means 2 and the first storage means 2
Although there is no competition for the transfer of signals from the second storage means 3 to the second storage means 3, the transmission paths may be separated into two depending on the case.

As described above, the tape duplication device embodying the present invention records the master digital signal in the first storage means 2 first, and then from the first storage means 2 to the second storage means 3. I tried to transfer it. Then, the master of the signal to be duplicated on the copy tape is created on the first storage means 2. Therefore, according to the tape duplication device embodying the present invention, it is not necessary to create a master tape that faithfully reflects the image of the signal to be duplicated on the copy tape as in the conventional case. According to the tape duplication device embodying the present invention, the A side and the B side of the signal to be duplicated on the copy tape can be created by different master tapes. Further, according to the tape duplication device embodying the present invention, since the time lengths of the A-side signal and the B-side signal are made uniform on the first storage means 2, the A-side and B-side signals are Even if they are created on separate master tapes, the signal lengths do not have to be the same at the master tape stage.

Other embodiments of the invention are possible. In the embodiment shown in FIG. 2, the master reproducing means 1 is described as having two tape reproducing units 7 and 8. However, the number of tape reproducing units may be one. If there is only one tape playback unit, the A-side tape and the B-side tape may be played back separately, or the A-side signal and the B-side signal may be recorded on one tape. You may do it. If the A-side signal and the B-side signal are recorded on one tape, the A-side signal and the B-side signal can be separated by the control ID. In the embodiment shown in FIG. 2, the two tape reproducing units 7 and 8 operate at the same time. However, it is not always necessary to start the operations at the same time, and the reproduction is ready first. The playback operation may be started from the other side.

Further, the first group of digital signals recorded on the first storage means 2 and the signals on the A side, which are the digital signals of the first group,
The signals of the B side, which are the digital signals of the group of, on the first storage means 2 by the action of the time adjusting means,
An example is shown in which the time lengths are adjusted to be the same. However, the time length of the signal on the A side and the time length of the signal on the B side may be the same at the stage of recording by the recording means 4 by the copy tape 50. Therefore, the time adjusting means may adjust the time length by adding the pseudo signal C on the second storage means 3, and when reading from the second storage means 3, the time length is adjusted. It may be adjusted.

Further, the time adjusting means outputs the pseudo signal C as the first signal.
It may be added to both the digital signal and the second digital signal of the group. At this time, although the length of the pseudo signal C differs depending on the time length of the digital signals of the first group and the time length of the second group, the purpose of making the lengths of both digital signals the same can be achieved. You can

Further, the time adjusting means may add the pseudo signal C to the middle of the signals of the group having the shorter time length. This includes, for example, eight groups of music programs recorded in the first group and seven music programs recorded in the second group.
Suppose you have a music program for a song. then,
If the time length of the second group is short, a pseudo signal is added so as to lengthen the intervals between the songs of the second group. Then, the first part of the first song and the end part of the eighth song of the first group can be brought close to the end part of the seventh song of the second group and the first part of the first song. As a result, when the A side and the B side are repeatedly reproduced,
It is possible to reduce the silence part to some extent.

Further, the second storage means 3 shown in FIG. 3 outputs 4 from the buffer memory unit 24.
Although an example in which the phases of the digital signals A1, A2, B1 and B2 of the channels are aligned has been shown, it may be better to have the phases deviated depending on the purpose of copying. That is, as shown in FIG. 4, the A-side heads 51 and 52 and the B-side heads 53 and 54 of the recording unit 4 are generally displaced from each other. Therefore, in order to completely match the signals on the A side and the B side, the misalignment of the head position may be corrected by controlling the read timing of the buffer memory unit.

[0030]

According to the tape duplicating apparatus embodying the present invention, the process of producing a master tape is simplified, and the production efficiency can be improved especially when duplicating a small amount of a variety of tapes. is there.

[Brief description of drawings]

FIG. 1 is a block diagram showing the overall configuration of an embodiment.

FIG. 2 is a block diagram showing the configuration of a master reproducing means.

FIG. 3 is a block diagram showing a configuration of second storage means.

FIG. 4 is a block diagram showing a configuration of recording means.

FIG. 5 is a diagram showing a configuration of a signal reproduced by a master reproducing device.

FIG. 6 is a diagram showing a configuration of a signal to which a pseudo signal is added.

FIG. 7 is a diagram showing a configuration of a signal recorded by recording means.

[Explanation of symbols]

 1 Master Reproducing Means 2 First Storage Means 3 Second Storage Means 4 Recording Means 5 Controller 50 Copy Tape C Pseudo Signal

Claims (5)

[Claims] 1. A master reproducing means for reproducing a signal recorded on a master medium as a digital signal, and a first storage means for recording the digital signal reproduced by the master reproducing means and reproducing the recorded digital signal. A second recording means for recording the digital signal reproduced from the first storage means and for reproducing the recorded digital signal
In the tape duplicating device, which comprises a storage unit for recording the digital signal reproduced from the second storage unit on a copy tape, and a digital signal output from the master reproducing unit for storing the digital signal in the first storage unit. A tape duplication device, wherein the operation of recording in the recording means and the operation of recording the digital signal reproduced from the second storage means by the recording means can proceed independently. 2. The tape duplicating apparatus according to claim 1, wherein the first storage means records digital signals reproduced from the master reproducing means in a separable manner into a first group and a second group. In addition, when the recorded digital signal is sent to the second storage means, the digital signal of the first group and the digital signal of the second group are separably sent. Tape duplication device. 3. The tape duplicating apparatus according to claim 2, wherein the digital signals of the first group and the digital signals of the second group recorded by the recording unit are:
A tape duplicating device comprising a time adjusting means for adjusting a time length so that the tapes have the same length. 4. The tape duplication device according to claim 2, wherein the time lengths of the digital signals of the first group and the digital signals of the second group are compared, and the digital signals of the first group and the digital signal of the first group are compared. A tape duplication device comprising a time adjusting means for adding a pseudo signal to a digital signal having a shorter time length so that the digital signals of the second group have the same time length. 5. The tape duplication device according to claim 1, wherein the first storage unit is a magnetic disk, and the second storage unit is a semiconductor memory.