JPH03181033A - Cutting signal sending device - Google Patents

Abstract

PURPOSE:To improve the efficiency and the quality by discriminating whether a cutting signal outputted based on error data of a digital signal is proper or not. CONSTITUTION:When an audio PCM signal is inputted to a digital processor 3, the correction processing is performed at each time of the occurrence of the reproduced audio PCM signal, and processing contents and a time code are outputted and stored in a register means 5a. When the cutting signal is completely processed by the digital processor 3, that is, when all of the signal to be recorded on one disk is reproduced from a master tape and is outputted to a cutting device C after prescribed signal processing, degrees of occurring error, the occurrence position of each error, and the frequency in occurrence of error in each degree are recognized by a discriminating means. Consequently, it is discriminated whether the use of the cutting signal for cutting processing is proper or not by these data. Thus, the work efficiency and the quality are improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a signal for modulating a recording laser supplied to a cutting device for a master disk, that is, a device for transmitting a cutting signal that is recorded content. .

[Summary of the Invention] The cutting signal transmitting device of the present invention includes means for outputting data such as the content and location of the error when an error is detected in a PCM signal reproduced from a recording signal source, for example, and Store data about errors. Based on the stored data, the quality of the cutting signal can be determined.

Furthermore, by having means for supplying the stored error-related data to the control means of the external device, the data can be used to control the operation of the external device.

[Prior Art] A cutting process is performed as the first step in manufacturing a video disc or the like.

For example, as is well known, in a cutting device, a recording laser beam modulated by a supplied cutting signal is used to expose a glass master coated with photoresist, thereby recording signals as bit information on the glass master disc. It will be done. Then, bits are formed on the glass master disk after cutting by a developing process, and then a stamper is created from this glass master disk through various steps, and a disk is manufactured by applying a stamper to a press machine.

Note that the cutting signal supplied to the cutting device is generated by reproducing a signal recorded on a cutting master tape, for example, by the output device section, that is, the cutting signal sending device section, and then performing a predetermined modulation process on the signal. be.

[Problems to be Solved by the Invention] By the way, in the disc manufacturing process, there are many causes for the signals (bit signals) recorded on the disc to be defective. Since leaving master discs or defective stampers unattended causes significant waste in the process and deterioration of quality, defective products must be immediately removed from the process.

This is particularly important in the cutting process, as it is the first stage of the process, and various techniques have been researched and proposed to prevent malfunctions in the cutting mechanism and to identify the occurrence of defective products due to malfunctions. There is.

However, if the cutting signal itself supplied to the cutting device contains an error or the like, the glass master must be considered defective even if the cutting process is accurate, but it is difficult to identify this. In other words, signal defects due to data errors that occur in the cutting signal output device must be detected by playing the master after it is created and by having the inspector monitor the played audio and video. Certification requires time and effort, and it is not easy to maintain a constant inspection level at all times, making the task difficult.

[Means for Solving the Problems] The present invention has been made in view of the above problems, and reads digital signals from a master tape and performs EFM
In a cutting signal sending device that uses a modulated signal as a cutting signal or a part of the cutting signal, errors in the digital signal can be easily identified.

That is, a digital signal processing means, a digital signal processing means capable of performing error processing on the digital reproduction output and outputting it to the modulation means, and also outputting error data such as error content and occurrence location, and storing this error data. A cutting signal transmitting device is provided with means for determining the quality of the cutting signal based on the stored error data.

Furthermore, means is provided for supplying the stored error data to the control means of the external device.

[Operation] By storing the contents of correction processing according to the degree of error and data indicating error locations using time codes, etc. as error data, the quality of the cutting signal itself can be determined, and the data can be used in the cutting device. By supplying it to an external device such as a playback device for inspecting a cut master disc, efficiency of the cutting process and master check work can be promoted.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of the cutting signal sending device of the present invention. In particular, an audio signal used for disc cutting is recorded in PCM on a signal source such as a master tape. An example of the case is shown below.

Reference numeral 1 denotes a video signal reproducing device section, which outputs a reproduced analog signal. Reference numeral 2 denotes a digital audio signal reproducing device section, which reads an audio signal recorded in PCM and outputs it as digital data. Note that a video signal reproducing device section 1 and a digital audio signal reproducing device section 2
For example, it may be configured with two VTRs that simultaneously record and reproduce video and audio signals as digital signals.

3 is a digital processor that performs various signal processing such as error correction processing on the input digital audio signal, and converts the audio signal after predetermined processing into analog and outputs it, or outputs it as a digital signal. It is possible to output. In addition to the audio signal, this digital processor 3 also uses, when performing error correction processing, the processing details for the error as data indicating the degree of the error, and the time code of the error position as data indicating the error position. It is configured so that it can be output. As for error processing in the digital processor 3, for example, corrections are made in descending order of read error conditions by using the redundancy code added on the PCM format.
RC processing, ■Average processing that compensates for error data by averaging the two values before and after it, ■Hold processing that compensates for error data by holding the value immediately before the error data, ■Mute processing for uncorrectable errors. Four types are designed to be performed.

4 is a modulation processing unit that performs predetermined modulation on the reproduced video signal and the audio signal supplied from the digital processor 3 and supplies it to the cutting device C as a cutting signal, and the analog video signal modulation circuit 4
a, an analog audio signal modulation circuit 4b, an EFM encoder 40 commonly used when recording PCM audio signals as digital data, and the like.

5 is a computer consisting of a CPU, a program ROM, a RAM, an interface section, etc.; 6 is a printer.

Note that C is a cutting device connected to the cutting signal exit device of this embodiment, to which a cutting signal is supplied and a cutting process is performed on the disk master;
T is a master disc evaluation device that can play back the master disc on which bits have been formed through a development process and check its quality; T is an audio and video playback device;
(including a monitor, speakers, etc.), a playback control computer T3, and a printer T.

FIG. 2 shows a functional block configuration artificially formed by software in the CPU of the computer 5.

5a is a register means for storing error data supplied and read from the digital processor 3, that is, error processing content data and time code; 5b is a register means for storing error data stored in the register means 5a;
5c is a register for determining the frequency of occurrence, degree of error state, etc., and determining whether the transmitted cutting signal is within an allowable range for use as a cutting signal or is inappropriate; Print output control means for printing out the data stored in the means 5b and the results determined by the determination means in the printer 6; 5d is a cutting device for transmitting the data stored in the register means 5a through one communication line; This is data output control means for supplying data to the control CPU of C or the computer T2 of the master evaluation device T.

By having the cutting signal sending device of this embodiment configured as described above, it is possible to determine the quality of the cutting signal as described below.

When the audio PCM signal is input to the digital processor 3, a correction process is performed every time an error occurs in the reproduced audio PCM signal, and the processing details (■ to ■ above) and time code are output and stored in the register. The information is stored in the means 5a. Then, at the stage when all the cutting signals have been processed by the digital processor 3, that is, at the stage when all the signals to be recorded on one disc have been reproduced from the master tape, the prescribed signal processing has been completed, and the signals have been output to the cutting device C. The determination means can recognize the degree of the error that has occurred (four levels of (1) to (4) above), the position where each error has occurred, and the number of times that each degree of error has occurred.

Therefore, it can be determined from these data whether it is appropriate or inappropriate to use the cutting signal for cutting processing.

For example, if the mute process is executed even once, it is inappropriate, if the hold process is executed several times, it is inappropriate, and if the average process is executed several times, it is inappropriate, etc. It's good to set standards.

The determination result, error data such as content, number of times of position, etc. are printed out by the printer 6 so that the operator can recognize them.

It goes without saying that the printer 6 may be replaced with, for example, a CRT display means.

Note that in this embodiment, the video signal was an analog output, so no error data was obtained regarding the video signal, but it is possible to do the same if the video signal source is a digital output.

Further, the cutting signal sending device of this embodiment can control the operation of the external device as described below by supplying error data to the external device.

That is, by storing the error data in the register means 5a and sequentially supplying it to the control CPU of the cutting device C, if the control CPU is equipped with means similar to the determination means 5b, the cutting signal can be The quality of the signal can be checked during the cutting operation, and when the number of errors reaches the standard value as mentioned above, and it is determined that the signal is inappropriate as a cutting signal,
It is also possible to cancel the cutting operation. In this case, the control signal may be directly supplied to the cutting device C based on the determination by the determining means 5b of the computer 5.

Furthermore, by supplying the obtained error data to the master evaluation device T, it is possible to improve the efficiency of the master evaluation work.

That is, the error data held by the register means 5a is stored in, for example, a RAM, and the data is supplied to the computer T of the master evaluation apparatus T when performing the master evaluation work after cutting.

By supplying the error data, the master evaluation device T can continuously access and reproduce only the error portion based on the time code, and monitor it. Therefore, for example, in the case where the error that has occurred is so minor that the cutting is performed as it is, it is very easy and quick to check the error state from the actual playback output. Note that it is also possible to restore the supplied error data by the printer T and use it as a reference for master inspection.

[Effects of the Invention] As explained above, the cutting signal sending device of the present invention is configured to be able to determine whether the outputted cutting signal is appropriate based on the error data of the digital signal. , it is possible to recognize defects based on cutting signals during the cutting stage of the disc manufacturing process, eliminating waste in the manufacturing process, achieving significant efficiency improvements, and further stabilizing quality. There is. Furthermore, since the detected error data can be supplied to a cutting device, a master evaluation device, etc., it is possible to improve the work efficiency of the relevant external devices.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a functional block diagram of a computer according to the embodiment. 1 is a video signal reproduction device section, 2 is a digital audio signal reproduction device section, 3 is a digital processor 4 is a modulation processing section, 5 is a computer, 5a is a register means, 5b is a determination means, 5c is a print output control means, and 5d is a Data output control means, 6 indicates a printer. g], -,, -1:

Claims (2)

[Claims] (1) A cutting signal sending device that performs predetermined modulation on the reproduced recording signal and supplies it to a disc cutting device, includes a reproduction means capable of reading the recording signal in the form of digital data, and a digital reproduction output from the reproduction means. A digital signal processing means capable of performing error processing and outputting the data to the modulation means as well as the error content and the location of the error, and a means for storing the error content and data of the error location output from the digital signal processing means. A cutting signal transmitting device comprising: and means for determining the quality of the cutting signal based on the data stored in the storage means. (2) A cutting signal transmitting device that performs predetermined modulation on the reproduced recording signal and supplies it to the disc cutting device, including a reproduction means capable of reading the recording signal in the form of digital data, and a digital reproduction output from the reproduction means. A digital signal processing means capable of performing error processing and outputting the data to the modulation means as well as the error content and the location of the error, and a means for storing the error content and data of the error location output from the digital signal processing means. A cutting signal transmitting device characterized by comprising: means for supplying data of error content and error location stored in the storage means to a control means of an external device.