JPS6353762A - Digital data premastering device - Google Patents

Abstract

PURPOSE:To reduce the cost of a device, and to miniaturize the device, by providing a memory circuit in an interface circuit for a processor, and recording a master recording medium by using a personal computer which performs data input when the quantity of data is reduced below a prescribed value. CONSTITUTION:A digital data taken out from a filing device, after being supplied to the personal computer 2, and being converted to a digital signal having a prescribed signal format, is written on external memory devices 7 and 8, and next, is written on a memory circuit part 11 in the interface circuit 6. And when the quantity of memory data is reduced below the prescribed value, the readout control of the external memory device 8 is performed by a detecting signal outputted from the detection circuit of the memory circuit part 11, and it is written based on a reference signal. The memory digital signal of the memory circuit part 11 is read out synchronizing with the reference signal of the processor 9, and after a redundant data is attached one very prescribed data quantity unit by the processor 9, the signal is converted to a video signal, then it is supplied to a recorder 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a digital data pre-mastering device, and is particularly applicable to AMC information media that records digital data such as two B voices and one character. The present invention relates to a pre-mastering device that performs processing such as formatting and time editing.

Conventional technology B AMC digital data related to 9 voices, 1 character, etc.
Before recording on information media, formatting and time editing are performed in advance, and conventionally, these formatting and FJS editing have been performed using a minicomputer class computer.

Digital data that has been time-collected and formatted using a minicomputer-level computer is
For example, after being converted into a video signal, it is supplied to a VTR, where it is recorded on a magnetic tape. This magnetic tape becomes, for example, a master tape on which digital data to be recorded on a CD-ROM is recorded.

This pre-mastering device, which uses a minicomputer-level computer, handles data internally at a fast speed.
It had the advantage of high-speed signal processing and high-speed data input/output through large doors.

Problems to be Solved by the Invention However, since the above-mentioned conventional premastering device uses a minicomputer, the entire device is cumbersome and expensive (for example, about 100 million yen). There was a point.

The present invention was created in view of the above points, and an object of the present invention is to provide a digital data premastering device that can perform premastering using a personal computer (office computer).

Means for Solving the Problems The digital data premastering device of the present invention includes a file device, an external storage device, and a digital signal in a predetermined signal format. A personal combination coater that writes to \I'tl, reads it out, and outputs it to the outside through an interface circuit having a memory circuit, adds redundant data to each predetermined data interval, and converts it into a video signal. It consists of a processor and a recording Vt2 for recording a video signal on a recording medium, and is designed to produce a recording medium recorded twice by a recording device as a master recording medium for manufacturing other recorded recording media in large quantities. It is composed of

The digital data taken out from the working file device is supplied to a personal computer, where it is added with a predetermined signal and converted into a digital signal in a predetermined signal format, and then externally recorded +t! into and out of the device. The digital signal read from the external memory 'a'aE is written to the memory circuit section in the interface circuit of the personal computer. The memory circuit unit has a detection circuit that detects the stored data m, and when the stored data a becomes less than a certain value, the external storage device is read υIII using a detection signal outputted from the detection circuit, and it is read out from the external storage device υIII. 1 based on the computer reference signal.

The digital signals stored in this memory circuit section are regularly read out in synchronization with the reference signal of the processor and supplied to the processor, where redundant data is added every m unit of predetermined data, and then converted into a video signal and recorded. supplied to the device.

Embodiment FIG. 1 shows a block system diagram of an embodiment of the apparatus of the present invention. In the figure, a magnetic tape playback device (MT drive) 1 plays back recorded signals on a recorded magnetic tape. This recorded signal is a variety of digital data related to audio, video, characters, etc. to be recorded on the CD-ROM disc, and is recorded on, for example, nine parallel tracks. Magnetic tape playback device (
The above-mentioned large amount of digital data reproduced by the MT drive) 1 is transferred to a personal computer (for example, 18M
MT in the company's PC/AT type office computer) 2
I/F (magnetic tape interface) 3
is serially transferred via DMA (direct memory access), and further transferred via DMA to a hard disk 7, which is an example of an external storage device, via an HDD I/F (hard disk drive interface) 4, and written therein. In this way, the digital data reproduced by the magnetic tape reproduction device 1 is written to the first hard disk 7 through the personal computer 2.

Next, the digital data stored in the hard disk 7 is read out under the control of the personal computer 2 and transferred to the HDD.
It is transferred to the personal computer 2 via the I/F 4, and the predetermined synchronization signal, ID signal, error correction code (FCC signal), etc. generated by the personal computer 2 defined in the CD-ROM are transferred to the predetermined data. It is added every ω unit and converted into a predetermined signal format.

The FCC signal is generated by the FCC generator 5.

Thereafter, the digital signal, which has been converted into the signal format specified by this CD-ROM and time-edited by a method such as rearranging the order of digital data by the personal computer 2, is sent to the HDD I/F at low speed.
4 and is supplied to the second hard disk 8 and written there. Note that the hard disks 7 and 8 each have a storage capacity of, for example, 470 megabytes.

Since the digital signals written to the hard disk 8 have the same signal format as the digital signals to be recorded on the CD-ROM disk as described above, by controlling the readout of the hard disk 8 by the personal computer 2, the digital signals can be read as if they were real. CD-ROM
A digital signal similar to that used when playing a disc is extracted from the hard disk 8, and this is used to reproduce the actual CD-R.
It is possible to perform a simulation operation when playing back an OM disc.

The digital signal confirmed in this way is reproduced from the hard disk 8 and transferred to the memory (not shown) in the personal computer 2 via the HDD I/F 4.
The data is then transferred via DMA to the PCM processor 9 via the processor I/F 6 (processor interface circuit). The PCM processor 9 is a publicly known device (for example, VP900 manufactured by Victor Corporation of Japan) that converts a digital signal into a video signal. It is configured to add redundant data such as code, error check code, etc., and output a video signal in which the digital signal with the redundant data added is time-division multiplexed with a composite signal and is made to exist in each video period. be.

Here, a reference oscillator that generates a reference signal that controls the operation of the personal computer 2 is located within the computer main body.
On the other hand, the operation of each PCM processor is
This is done based on a reference signal from an internal reference signal generator. Therefore, the two are not in a synchronous relationship.

On the other hand, since the PCM processor 9 is used for the purpose of digital recording of audio signals, the number of abrasive pits is 32.
A digital signal with a sampling frequency of 44.1 kHz is converted into a video signal using bits. That is, the PCM processor 9 converts the input digital signal into a video signal at a constant rate of 176.4 bytes per second and continuously outputs the video signal.

Therefore, if there is even a slight error in the operating frequencies of both the personal computer 2 and the PCM processor 9, the digital signal will be transmitted at a constant rate of 176.4 bytes per second.
Since the digital signal is not supplied to the CM processor 9, a digital signal recorded as a video signal cannot be obtained continuously, and as a result, it becomes impossible to produce a master tape for a CD-ROM.

Further, if there is a defect on the hard disk 8, it is necessary to write or read data by skipping that portion, and data continuity may not be maintained here as well.

Therefore, in this embodiment, a memory circuit section 11 is provided within the processor I/F 6. This memory circuit section 11 is an example of a memory circuit such as a FIFO (F1rstln
F1rst Qut) and a detection circuit that detects whether the data noise stored in the FIFO has become less than a predetermined constant value or exceeded a predetermined amount. As shown in FIG. 2, this memory circuit unit 11 uses a FIFO to transfer digital signals (data) reproduced from the hard disk 8, DMA-transferred within the personal computer 2, and serially input through the terminal 12 to the personal computer 2. Writing is performed sequentially based on the write clock from the terminal 13 generated from the reference signal.

This P I FOkm data is read out regularly to the terminal 15 at a constant speed of 176.4 bytes per second based on the read clock from the terminal 14 obtained by dividing the reference signal of the PCM processor 9, for example. The signal is output and further supplied to the PCM processor 9 in FIG. When the stored data r in the FIFO becomes smaller than a certain value by reading this data, the detection circuit in the memory circuit section 11 detects this fact, and the detection signal is sent to the terminal shown in FIG. 2 as a signal indicating data suspension. The signal is supplied to the readout control circuit of the hard disk 8 in the personal computer 2 via the line 16, and is operated to read and reproduce the hard disk 8.

That is, the above detection signal is a write instruction signal to the memory circuit section 11, and the digital signal reproduced from the hard disk 8 based on this is a write instruction signal to the memory circuit section 11.
1 is intermittently written at a faster speed than the reading speed of the memory circuit section 11. In addition, the above-mentioned detection circuit constantly monitors the amount of stored digital data in the FIFO, and when it exceeds a predetermined amount, it stops playing the hard disk 8 and stops inputting data to the terminal 12, and when it becomes less than a certain value, it stops playing the hard disk 8 and stops inputting data to the terminal 12. Resume data entry.

As a result, the ! between the personal computer 2 and the PCM processor 9! Even if the signal frequencies are different from each other,
While both of them operate normally, digital signals are continuously supplied to the PCM processor 9 at a predetermined constant speed. Further, even if data transfer from the hard disk 8 is stopped for some reason, normal digital signals can be continuously supplied to the PCM processor 9 until the data stored in the memory circuit section 11 is exhausted.

The digital signals continuously supplied to the PCM processor 9 in this way are converted into video signals as described above, and then supplied to the VTR 10 shown in FIG. 1, where they are recorded on a magnetic tape (not shown). be done. This VTR 10 is a normal helical scan type VTR, and performs recording operations based on the same reference signal as the reference signal from the PCM processor 9. The magnetic tape recorded by this VTR 10 becomes a master tape for a CD-ROM disk cutting system (not shown).

This master tape is continuously reproduced by a VTR and converted into a digital signal, and then supplied to a known disc cutting system using a light beam to produce a master recording disc. Furthermore, CD-ROM disks (compact disks) are manufactured in bulk by a known disk making process based on this recording master disk.

It should be noted that the present invention is not limited to the above-described embodiment, and for example, an optical disk recording/reproducing device may be used instead of the VTR 10.

Effects of the Invention As described above, according to the present invention, since it is possible to record on a master recording medium using a personal computer (office computer), it is possible to record data on a master recording medium using a personal computer (office computer). 3 or less), it is possible to configure a compact data pre-mastering device such as a CD-ROM, and a memory circuit section is provided in the processor interface circuit, and the stored digital data is constantly monitored and stored at a predetermined m. Data input is stopped when the above value is reached, and data input is restarted when the value falls below a predetermined value, so that digital signals are continuously retrieved from the memory section at a predetermined transfer rate in synchronization with the reference signal of the PCM processor. It has features such as being able to

[Brief explanation of the drawing]

FIG. 1 is a block system diagram showing one embodiment of the present invention, and FIG.
The figure is a block system diagram of main parts in the block system shown in FIG. 1. 1...Magnetic tape playback device (MT drive), 2...
・Personal computer (office computer),
5...FCC generation unit, 6...Processor I/F (processor interface circuit), 7.8...Hard disk, 9...PCM processor, 10...V
TR, 11...Memory circuit section.

Claims (2)

[Claims] (1) A file device and an external storage device that store a large amount of digital data, and the digital data from the file device is transferred at high speed, and a predetermined signal is generated and added thereto to generate a digital signal in a predetermined signal format. a personal computer that generates a digital signal, writes it in the external storage device, performs read control on the external storage device, and outputs the obtained digital signal to the outside through an interface circuit having a memory circuit section; a processor that is operated with a reference signal different from the above, adds redundant data to each predetermined data amount unit of the digital signal taken out through the interface circuit, and converts it into a video signal and outputs it; A digital data premastering device comprising a recording device that is operated with the same reference signal as the processor and records an output video signal of the processor on a recording medium, wherein the memory circuit section in the interface circuit is configured to store the video signal output from the processor. It has a detection circuit that detects the amount of data, and when the amount of stored data becomes less than a certain value, the readout of the external storage device is controlled by a detection signal output from the detection circuit, and the reference signal of the personal computer is controlled. writes the digital signal read out in the memory circuit based on the above, reads out the digital signal stored in the memory circuit regularly to the outside in synchronization with the reference signal of the processor, and transfers the recording medium recorded by the storage device to another. 1. A digital data pre-mastering device for producing a master recording medium for mass production of pre-recorded recording media. (2) The personal computer outputs a digital signal of 170 to 200 kilobytes per second through the memory circuit, the recording device is a VTR that records the video signal on a magnetic tape, and the other recorded recording medium is CD-R
The digital data pre-mastering device according to claim 1, wherein the digital data pre-mastering device is an OM disk.