JP2784826B2 - Cutting signal transmitting device and method for determining cutting signal - Google Patents

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 disc, that is, a device for transmitting a cutting signal serving as recording contents, and a device for transmitting a cutting signal. It relates to a determination method.

[Summary of the Invention] A cutting signal sending device and a determination method of the present invention
For example, if an error is detected in a PCM signal reproduced from a recording signal source, the PCM signal is provided with means for outputting data such as the content of the error and the location where the error occurred, and further stores data relating to the error. Then, the quality of the cutting signal can be determined based on the stored data.

Further, by providing a means for supplying the stored data relating to the error to the control means of the external device, the data can be used for controlling the operation of the external device.

2. Description of the Related Art A cutting process is performed as a first stage of manufacturing a video disc or the like.

For example, as is well known, in a cutting apparatus, a recording laser beam modulated by a supplied cutting signal is used to record a signal as pit information on a glass master by exposing the glass master coated with a photoresist to light. Is made. Then, pits are formed on the glass master after cutting by a development process,
Next, a stamper is formed from the glass master through each step, and the stamper is pressed with a press machine to produce a disk.

The cutting signal supplied to the cutting device is a signal obtained by reproducing a signal recorded on, for example, a cutting master tape by an output device portion thereof, that is, a cutting signal sending device portion, and subjecting the signal to predetermined modulation processing. It is.

[Problems to be Solved by the Invention] By the way, in a disk manufacturing process, there are many causes that a signal (pit signal) recorded on the disk becomes defective, and it is difficult to recognize occurrence of a defective recording signal. Alternatively, leaving a defective stamper or the like unnecessarily causes waste in the process and lowers the quality. Therefore, the defective product must be immediately removed from the process.

In particular, since this is the first step in the cutting process, this point is strongly demanded, and various technologies for preventing malfunction of the cutting mechanism and determining occurrence of defective products due to malfunction have been studied and proposed. I have.

However, if the cutting signal supplied to the cutting device itself contains an error or the like, the glass master must be defective even if accurate cutting processing is performed, but it is difficult to certify it. That is, it is necessary to reproduce the signal failure caused by the data error generated in the cutting signal transmission device after the master is created, and monitor and find the reproduced sound and the reproduced video by the inspector. There is a problem that it takes time and effort to make the certification, it is not easy to always keep the inspection level constant, and the work is difficult.

[Means for Solving the Problems] The present invention has been made in view of such problems, and reads a digital signal from a master tape and performs EFM.
In a cutting signal transmitting apparatus that uses a modulated signal as a cutting signal or a part of the cutting signal, an error in the digital signal can be easily recognized.

That is, digital data reproducing means, digital signal processing means capable of performing error processing on the digital reproduction output and outputting the result to the modulation means, and outputting error data such as the content of the error and the location where the error occurred, and storing the error data And a cutting signal transmitting device comprising means for determining the quality of the cutting signal based on the stored error data.

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

[Operation] By storing, as error data, the content of a correction process according to the degree of error and data indicating an error location based on a time code or the like, the quality of the cutting signal itself can be determined. Supply to an external device such as a reproducing apparatus for inspecting the original master that has been cut or the like, it is possible to promote the efficiency of the cutting process and the original master check operation.

[Embodiment] Fig. 1 is a block diagram showing an embodiment of a cutting signal transmitting apparatus according to the present invention. In particular, an audio signal to be provided for disc cutting is recorded in a signal source such as a master table by PCM recording. Here is an example of the case.

Reference numeral 1 denotes a video signal reproducing device which outputs a reproduced analog signal. Reference numeral 2 denotes a digital audio signal reproducing unit which reads an audio signal recorded in PCM and outputs the digital signal as it is. The video signal reproducing device 1 and the digital audio signal reproducing device 2
May be composed of two VTRs for simultaneously recording and reproducing a video signal and an audio signal as digital signals.

Reference numeral 3 denotes a digital processor which performs various signal processing such as error correction processing on the input digital audio signal, and converts an audio signal after performing predetermined processing into an analog signal, and outputs the analog signal. It is possible to output. Further, in the digital processor 3, in addition to the audio signal, when performing error correction processing, the processing content 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 to be able to output. The error processing in the digital processor 3 includes, for example, a CR that performs correction using a redundant code added on the PCM format in the order of the least read error state.
There are four types of processing: C processing, average processing that compensates for error data with the average value of the two values before and after it, hold processing that compensates for error data by holding the value immediately before the error data, and mute processing for uncorrectable errors. It is being done.

4 is a reproduced video signal or a digital processor 3
And a modulation processing unit for performing predetermined modulation on the audio signal supplied from the unit and supplying the signal to the cutting device C as a cutting signal.
4a, an analog audio signal modulation circuit 4b, an EFM encoder 4c commonly used when recording PCM audio signals as digital data, and the like.

Reference numeral 5 denotes a computer including a CPU, a program ROM, a RAM, an interface unit, and the like, and reference numeral 6 denotes a printer.

C is a cutting device connected to the cutting signal sending device of the present embodiment, and a cutting signal is supplied to execute a cutting process on the disc master. T is a master that has been cut and has pits formed by a developing process. A master disc evaluation device that can be played back to check its quality, and a sound and video playback device
T ₁ (including a monitor, a speaker, etc.), a computer T ₂ for reproduction control, and a printer T ₃ .

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

5a is register means for storing error data supplied and read from the digital processor 3, that is, error processing content data and time code, and 5b is based on the error data stored in the register means 5a. Judging means capable of judging the degree of the state and the like, and judging whether the transmitted cutting signal is within an allowable range used as the cutting signal or is inappropriate, 5c is stored in the register means 5a Print output control means for printing out the output data and the result determined by the determination means 5b in the printer 6, 5d
The data stored in the register means 5a, for feeding through the communication line cutting device C for controlling the CPU, or the computer T ₂ of the master evaluation device T, a data output control means.

With the above configuration of the cutting signal transmitting apparatus of the present embodiment, 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 each time an error occurs in the reproduced audio PCM signal, the processing contents (above) and a time code are output, and the register means 5a Is stored. Then, at the stage where all the cutting signals have been processed by the digital processor 3, that is, at the stage where all the signals to be recorded on one disc have been reproduced from the master tape and the signal processing has been completed and output to the cutting device C, The degree of error that has occurred (the above four steps), the position where each error has occurred, and the number of times that each degree of error has occurred can be recognized by the determination unit 5b.

Therefore, it can be determined from these data whether it is appropriate or inappropriate to subject the cutting signal to the cutting process.

For example, if the mute process is performed at least once, it is unsuitable, if the hold process is performed several times, it is inappropriate.
Appropriate judgment criteria may be set, for example, if the averaging process is executed several tens of times, the judgment is inappropriate.

Judgment result, error content, error occurrence position,
The error data such as the number of times is printed out by the printer 6 and is recognized by the worker.

It goes without saying that, for example, a CRT display means or the like may be provided instead of the printer 6.

In this embodiment, since the video signal is an analog output, no error data is obtained for the video signal. However, the same is possible if the video signal source is a digital output.

In addition, the cutting signal transmitting apparatus and the transmitting method of the present embodiment can control the operation of the external device as follows by supplying the error data to the external device.

That is, the error data is stored in the register means 5a and is also supplied to the control CPU of the cutting device C sequentially, so that if the control CPU has the same means as the determination means 5b, the cutting signal Can be checked during the cutting operation, and the cutting operation can be stopped when the number of errors reaches, for example, the above-described reference value and is determined to be inappropriate as a cutting signal. . In this case, the control signal may be directly supplied to the cutting device C based on the determination by the determination means 5b of the computer 5.

Further, by supplying the obtained error data to the master disc evaluation device T, the efficiency of the master disc evaluation work can be improved.

That is, the error data held by the register means 5a, for example may be stored in the RAM, when performing a master evaluation work after cutting, and supplies the data to the computer T ₂ of the master evaluation device T.

By supplying the error data, the master disc evaluation device T can continuously access and reproduce only the error portion based on the time code and monitor the error portion. Therefore, for example, when the generated error is minor and the cutting is performed as it is, it is very easy and quick to confirm the error state with the actual reproduction output. In addition,
The supplied error data listed in the printer T _3, it is possible to provide a reference of the master test.

[Effects of the Invention] As described above, the cutting signal transmitting apparatus and the cutting signal discrimination method of the present invention store data output based on an error signal, an error position, and the like of a digital signal subjected to cutting. Means for determining whether the cutting signal is appropriate based on the data stored in the storage means, and at least mute processing is performed in data indicating error signal processing. When data indicating that the cutting signal is included, the cutting signal is determined to be unsuitable, so that a defect based on the cutting signal can be recognized at the stage of cutting in the disc manufacturing process, and in the manufacturing process, It can eliminate waste, achieve significant efficiency, and promote quality stabilization. There is fruit. In addition, since the detected error data can be supplied to the cutting device, the master evaluation device, and the like, the effect of improving the inspection and working efficiency of the master evaluation device for inspecting a portion having a problem with the cutting signal can be improved. is there.

[Brief description of the 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 of the embodiment. 1 is a video signal reproducing unit, 2 is a digital audio signal reproducing unit, 3 is a digital processor, 4 is a modulation processing unit, 5 is a computer, 5a is register means, 5b is determination means, 5c is print output control means, 5d Is data output control means,
Reference numeral 6 denotes a printer.

Claims (3)

(57) [Claims] The present invention performs a signal processing including an error correction processing of a digital signal which is supplied from a signal source and is supplied to a cutting apparatus with a cutting signal subjected to a predetermined modulation processing by a modulation means. A signal processing unit for outputting data indicating processing contents and an error position for the generated error; a storage unit for storing data indicating the processing contents and the error position for the error output from the signal processing unit; When all the output digital signals are supplied to the cutting device, the processing content for the error stored in the storage means and the data indicating the error position, Pass / fail judgment and processing contents for errors stored in the storage means And when the data indicating the error position includes at least data indicating that the mute process has been performed, the cutting signal is transmitted as a cutting signal. apparatus. 2. The apparatus according to claim 1, further comprising data output means for supplying data indicating the processing content and error position of the error output from said signal processing means to a control means of an external device. Item 6. The cutting signal transmitting device according to Item 1. 3. A digital signal output from a signal source, subjected to predetermined modulation processing by a modulation means, and supplied to a cutting device as a cutting signal is subjected to signal processing including error correction processing. The processing contents for the error that has occurred and the data indicating the error position are stored. When all the digital signals from the signal source are output to the cutting device, the processing contents for the stored error and the data indicating the error position are stored. The quality of the cutting signal supplied to the cutting device is determined based on the data, and the data indicating the processing content and the error position of the stored error include at least data indicating that the mute process has been performed. Sometimes, the cutting signal is determined to be inappropriate. Determination method of potting signal.