JP3043468B2 - Digital data recording media duplicator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital data recording medium copying apparatus for copying digital data to a recording medium such as a magnetic tape.

[0002]

2. Description of the Related Art Signals such as audio signals and image signals are originally analog data. When recording such data on various media such as a magnetic tape, a magnetic disk, a magneto-optical recording medium, a semiconductor memory, and an optical medium, analog data is converted into digital data and recorded as digital data. The medium that records this digital data is
In order to supply the market in large quantities, industrial media duplication means are required. Conventionally, to record analog data on a medium, it has been recorded as analog data. As a technique for copying analog data as analog data in a large amount on a medium, for example, USP 4,410,917,
The technique described in JP-A-2-177060, US Pat. No. 4,355,338 is known.

The feature of the technology described here is that digital technology is applied when recording analog data on a medium. That is, the technique described here stores data to be recorded on a medium in a memory included in the configuration of the device,
Stored as digital information. When recording on a medium, the digital data stored in the memory is converted into analog data and sent out. This method can be said to be an excellent method when a large amount of media on which analog data is recorded is copied. However, this method is not always appropriate when the format of the information recorded on the medium is digital. The reason is that when transferring information to the medium to be recorded, a sufficient transfer speed cannot be obtained. If the transfer speed is low when transferring information to the medium to be recorded, it takes time to copy a large amount of data to the medium. The cause is that the conventional copying system stores information to be recorded on a medium as digital information in a storage device in the system, and the format of the information stored here is as follows.
This is because the format of information recorded on a medium as digital information is significantly different. For example, this is because 16-bit digital information is stored in a storage device, but is recorded in a medium in a 4-bit format.

[0004] For example, if a specific example of data conversion using a conventional duplication system is shown, if the original analog information is audio data, it is first converted to 16-bit digital information at a sampling frequency of 48 KHz. I do. When the digital information is recorded on a recording medium, the 16-bit information is first compressed by an information compression technique so as to become 4-bit information. Then, in order to cover a physical defect of the medium, an interleaving operation is performed, and recording is performed on four tracks of the recording medium. At this time, an error correction code is added to the 4-bit information, and, if necessary, an operation of converting 8-bit information to 10-bit information is performed so that the information can be recorded at a high density on a recording medium. For this reason, if a digital information duplication system is configured by improving the conventional analog information duplication system, a data format conversion process that requires a lot of processing time must be performed when recording on a medium.

[0005] A further disadvantage of conventional replication systems is that they require time to load the original data into main memory. Conventional replication systems must stop replication while loading the original data into main memory, which also reduces the efficiency of replication.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem that, when a large amount of digital data is copied onto a recording medium at high speed, the copy efficiency is reduced. In particular, the problem to be solved by the present invention is to solve the problem that the transfer rate of information cannot be increased when a digital information format conversion operation is required when transferring digital data to a recording medium. Is what you do.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a reproducing means for reproducing a reproduced signal from a reproducing medium, and a digital signal for performing an information compression operation on the reproduced signal reproduced from the reproducing means. Coding means for converting the data into data, memory means capable of storing or reading digital data generated by the coding means, memory management means for managing storage or reproduction of digital data stored in the memory means, Recording means for converting digital data read from the memory means into recordable record data; and recording means for recording the record data on the recording medium , wherein the memory means
Comprises at least first and second memory blocks,
The memory management means reads the first memory block.
While writing or reading the second block
The digital data duplication device is characterized by controlling the memory means so as to be able to perform the operation.

[0008]

[0009]

In the above means, the reproducing means outputs the data recorded on the recording medium as digital data as a reproduced signal, and this data is compressed by the coding means before being stored in the memory means. This makes it possible to transfer data from the memory means to the recording means at a very high speed. Also, an error correction code is added as needed. The memory means and the memory management means accumulate the digital data generated by the coding means and read out the accumulated digital data as necessary. The recording conversion unit converts the digital data read from the reading unit into a data format suitable for recording on a recording medium by the recording unit. Further, the memory means is composed of at least two blocks. If one block is being read and the other one is writable, while the system is performing the duplication operation, the reproduction means receives the data from the reproducing means. Data capture is possible.

[0010]

1 is an overall block diagram of a digital data copying apparatus embodying the present invention, and 1 is a reproducing means.
The reproduction means 1 reproduces a signal recorded on a reproduction medium.

The information reproduced from the reproducing means 1 is digital data.

Reference numeral 2 denotes coding means. The coding means 2 operates a reproduction signal reproduced from the reproduction means 1 and generates digital data which has been subjected to predetermined coding.

Reference numeral 3 denotes a memory management unit, and reference numeral 4 denotes a memory unit. The memory means 4 accumulates digital data output from the coding means 2 and outputs the digital data as needed. The memory management unit 3 manages the memory unit 4.

Reference numeral 5 denotes recording conversion means, and reference numeral 6 denotes recording means. The recording means 6 records digital data stored in the memory means 4 on a recording medium. When transferring the digital data stored in the memory means 4 to the recording means 6, the recording conversion means 5 provides optimum information, for example, 8 bit-1.
The conversion is performed to information for optimizing a magnetization reversal pattern such as 0-bit conversion.

FIG. 2 shows a more detailed configuration of the embodiment shown in FIG.

As shown in FIG. 2, for example, the reproducing means 1 includes a digital tape recorder 10, an analog tape recorder 11, a magneto-optical disk 12, and an A / D converter 1.
3 and so on. The coding means 2 includes, for example, a digital signal processor (DSP) 14, R as shown in FIG.
It comprises an OM (read only memory) 15, a RAM (random access memory) 16, and the like. The memory management means 3 includes a memory management unit (MM1) 19,
(MM2) 20 and a controller (CONT) 21 for controlling the memory management units 19 and 20 are included. The memory means 4 is composed of two RAM blocks 17 and 18. The two RAM blocks 17, 18 can be managed independently of the memory management means 3.

The operation of the above embodiment will be described below.

The reproduction means 1 uses the digital tape recorder 10
The magneto-optical disk 12 has a data width of, for example, 16
Play bit digital data. The output of the analog tape recorder 11 is an analog-digital (A /
D) The conversion circuit 13 is connected, and the data width of the output of the analog-to-digital (A / D) conversion circuit 13 is, for example, 16 bits. However, these reproducing means are not specified, and the width of data to be reproduced, the sampling rate, and the expression format of the data are defined by industry or recommended standards of specific standards. if,
Even if the standard of the digital data output from the reproducing apparatus used for the reproducing means 1 is variously different, at present, the digital data can be converted to the standard standard as it is.

The coding means 2 performs operations such as information compression of the digital data from the reproducing means 1. In this information compression operation, for example, a reproduced signal reproduced from the reproducing means has a data width of 16 bits and is converted into a data width of 4 bits. The DSP 14 has a 16 bit
According to a program for performing t-4 bit conversion, signal processing is performed with reference to data stored in the RAM 16.
This information compression procedure is performed in consideration of the data expression format in the recording means 6 shown in FIG. The coding means 2 also generates an error correction code as needed. The information compression operation in the coding means 2 is performed before the digital data is stored in the memory means, that is, the digital data to be recorded on the recording medium is
It has been processed by the coding means before being stored in the memory means. Therefore, when digital data is recorded on a recording medium, complicated processing as in the related art is not required.
As a result, the data transfer from the memory means to the recording means
It can be done at very high speed. Note that the 8-bit to 10-bit conversion performed as necessary by the recording conversion means does not take a long time, and thus does not impair the speeding up.

In the memory management means 3 and the memory means 4, the memory blocks 17 and 18 are stored in memory management units 19 and 20.
Is managed under the control of the controller 21 by
The memory blocks 17 and 18 can be independently written and read. That is, while the memory block 17 is receiving the data from the coding unit 2, the memory block 18 can transfer the data to the recording conversion unit 5 in parallel with the reception of the data from the coding unit 2. In this way, the recording operation by the recording unit 6 can be performed while data is being fetched from the reproducing unit 1.

In addition to the reproducing means 1 and the recording means 6,
An auxiliary memory for directly transferring data to the memory means 4 or for directly writing data in the memory means 4 as shown in FIG. 3 may be provided. This auxiliary memory is called a streamer 21 using a magnetic tape memory, a fixed storage memory, an optical disk, or the like. The streamer 21 can temporarily accumulate data stored in the memory means 4 which is a semiconductor memory, and can read the data to the recording / converting means 5 as necessary. Therefore, there is no need to read data from the reproducing means 1, that is, by adding this auxiliary memory, data can be stored in the memory means 4 at high speed without the intervention of the reproducing means 1 or the coding means 2. is there.

[0022]

According to the present invention, when a large amount of digital data is copied onto a recording medium at high speed, the data format is converted in advance at the stage of storing the data in the memory. Therefore, in the process of transferring data from the memory to the recording medium, a data format conversion operation is not required, so that data can be transferred at high speed. Therefore, by implementing the present invention, an efficient digital data recording medium duplicating apparatus can be realized.

[Brief description of the drawings]

FIG. 1 shows the configuration of an embodiment of the present invention.

FIG. 2 is a detailed configuration of the embodiment shown in FIG. 1;

FIG. 3 is a configuration when an auxiliary memory is added to the embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reproduction means 2 Coding means 3 Memory management means 4 Memory means 5 Record conversion means 6 Recording means

Claims (2)

(57) [Claims] 1. A digital data duplication device for recording a reproduction signal reproduced from a reproduction medium by a reproduction unit on a recording medium as digital data in which information is compressed by a recording unit, wherein the reproduction unit reproduces the reproduction signal from the reproduction medium; Coding means for converting a reproduction signal reproduced from the reproduction means into digital data subjected to an information compression operation; memory means capable of storing or reading digital data generated by the coding means; and memory means for storing the digital data Memory management means for managing storage or reproduction of digital data, recording conversion means for converting digital data read from the memory means into recordable record data, and recording for recording the record data on the recording medium Means , said memory means comprising:
At least first and second memory blocks,
The memory management means is reading the first memory block
The writing or reading of the second block is
An apparatus for duplicating digital data , wherein said apparatus controls said memory means as possible. 2. The digital data duplication apparatus according to claim 1 , wherein said coding means performs an information compression operation and an operation of adding an error correction code to the reproduction signal reproduced from said reproduction means. Digital data copying device.