JPH0294170A - Information recording medium reproducing device - Google Patents

Abstract

PURPOSE:To prevent the malfunction of the title reproducing device by interrupting the reproduction of an information recording medium by means of a data error processor when a data error is detected in digital data. CONSTITUTION:A digital signal process circuit 116 which detects an uncorrectable data error in binary codes recorded as digital data and a controller 122 which interrupts the reproduction of an optical video disc 101 when an uncorrectable data error is detected are provided. When the circuit 116 outputs a data error detecting signal to the controller 122, the controller 122 stops the reproduction of the video disc 101 by stopping a spindle motor 1021 and reading of optical pickup 1022 and sending an error status to a microcomputer 121. Therefore, the malfunction of this reproducing device can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is for reproducing information recording media in which information that is continuously output without interruption on the time axis and digital data as auxiliary data of the information are multiplexed and recorded. The present invention relates to an information recording medium reproducing device.

2. Description of the Related Art In recent years, audio information and video information are often used in combination, and so-called video discs and video tape recorders have become popular. Furthermore, recently there has been a movement to use computers to handle audio and video information. As one form of this, a video disk has been commercialized in which digital data handled by a computer in addition to audio information and video information is recorded on the video disc. It is thought that information recording media that multiplex and record the digital data handled by the Internet will continue to be developed and become more popular in the future.

Problems to be Solved by the Invention However, the following problems occur when the information recording medium described above is reproduced. In other words, if a data error that cannot be corrected or interpolated occurs in the digital data due to scratches or dirt on the information recording medium during playback, if the part of the digital data where the data error occurred is reread, the audio information and video information will also be reproduced in the same part. is played repeatedly against the viewer's will, resulting in the audio and video information not being played properly.Furthermore, if playback is continued after a data error has occurred, errors may occur. The recorded digital data is handled by the internal microcomputer, which may cause the playback device to malfunction. For example, if we assume that an information recording medium is a disk in which quizzes and their answers are recorded as video and audio, and instructions for controlling the playback order are recorded as digital data, an error may occur in the digital data while the information recording medium is being played, and the quiz The value of the information recorded on the information recording medium is lost, such as when the answers are played before the questions are asked, or because of data errors, instructions that cannot be interpreted are sent to the built-in microcomputer.
There was a risk that the microcomputer could go into a halt state (a halted state in which software cannot restart it).

This is not limited to information recording media in which audio information, video information, and digital data are multiplexed and recorded as mentioned above, but also information that is output continuously on the time axis and digital data as auxiliary data for the information. This becomes a big problem when reproducing information recording media on which data is multiplexed and recorded.

In view of the above, an object of the present invention is to provide an information recording medium reproducing apparatus that can prevent malfunctions of the reproducing apparatus, or can detect in advance that an abnormality will occur in the reproducing apparatus.

Means for Solving the Problems The present invention provides a reproducing means for reproducing the information and the digital data from the information recording medium, a separating means for separating the reproduced information and the digital data, and a method for detecting data errors in the digital data. a data error detection means for detecting a data error, and a data error processing means for interrupting reproduction of the information recording medium when a data error occurs, or a data error processing means for visually informing the outside of the occurrence of a data error when a data error occurs. The information recording medium reproducing apparatus is characterized in that it includes at least data error processing means for audibly notifying the outside of the occurrence of a data error when a data error occurs.

According to the above-described configuration, when a data error in digital data is detected by the data error detection means, the data error processing device interrupts reproduction of the information recording medium or detects the data error visually. An information recording medium reproducing device is provided that can prevent malfunctions of the reproducing device or know in advance that an abnormality will occur in the reproducing device in order to notify the outside of the device or to notify the outside audibly. realizable.

Embodiments First, information recording media used in the first and second embodiments will be explained. In the first and second embodiments, an optical video disc is used as the information recording medium, an NTSC signal is used as the video signal, and a control code (hereinafter referred to as binary code) of a microcomputer built in the information recording medium playback device is used as digital data. ) is used. Second
The figure is a block diagram schematically showing a method for recording video signals, audio signals, and digital data on the optical video disc used in this embodiment.

The recording method will be described below. Video signal and audio signal 2
Each channel has a pre-emphasis circuit 201.2
03.205 emphasizes the high range of the signal. This is done in order to reduce noise accompanying frequency modulation (hereinafter referred to as FM modulation) and frequency modulation demodulation (hereinafter referred to as FM demodulation) that will be performed later, and at the same time to expand the effective dynamic range.

Thereafter, the FM modulators 202, 204, and 206 convert the video signal to a center frequency of 8.5 MHz1 and a frequency deviation of +1.
7MHz1 acoustic signal 2 channels have a center frequency of 2.
3MHz and 2.8MHz, frequency deviation ±100K
Hz and F'M modulated. Separately, each of the two audio signal channels is connected to an analog-to-digital converter (hereinafter referred to as
The signal is converted into a linear pulse coded (hereinafter referred to as PCM) audio signal with a sampling frequency of 44.1KH21 and a quantization bit count of 16 bits by AD converters 207 and 208, and is time-axis multiplexed by a multiplexer 209.

The time axis multiplexed PCM audio signal is sent to the multiplexer 21.
The lower 4 bits are replaced with a binary code by 0 and sent to the digital signal processing circuit 211. The digital signal processing circuit 211 adds CIRC to the PCM acoustic signal, performs EFM modulation, and so on. What is CIRC?
rCrossInterleave Reed-8
olom.

n Abbreviation for CodeJ, which is a code added to efficiently detect and correct data errors that occur on optical disc media. EFM modulation is rEight to
Abbreviation for Fourteen ModulationJ.
This is a modulation method that converts 8-bit data into 14-bit data and modulates it into a signal format (with a narrow frequency band (and low DC component)) suitable for recording on optical disc media. The EFMFM acoustic signal band-pass filter 212 removes signals of 2 MHz or more, and the pre-emphasis circuit 213 emphasizes the high frequencies in the same way as the video and audio signals. The video signal, audio signal, and audio signal containing EFM-modulated digital data are combined into one signal by an adder 214, and further input to a limiter 215, where it is shaped into a square wave.The square wave is input to an optical converter 216. Disk 21 according to the input square wave
7 is irradiated with a laser beam and information is recorded.

The spectrum of the disc produced in this way is shown in Figure 3. The optical video disc playback device manufactured as described above will be described below.

FIG. 1 is a block diagram of an information recording medium reproducing apparatus in a first embodiment of the present invention. In FIG. 1, reference numeral 101 denotes an optical video disc on which information is recorded by the method described above;
Reference numeral 102 denotes a reproducing unit, which includes a spindle motor 102L that rotates the optical video disc 101, an optical pickup 1022 that reads out the RF multiplied signal from the optical video disc 101, and a preamplifier 1023 that amplifies the RF multiplied signal.
Consists of etc. What is RF?rRadio Freq
Abbreviation for ``uency'', which refers to high frequency. 103 is RF
MTF that performs double signal high frequency compensation (Modu 1at
ion Transfer Function.

n) correction circuit; 102 is a video bandpass filter for extracting an FM video signal from the RF multiplied signal; 105 is a video FM demodulator for demodulating the video signal; 106 is a video signal whose high frequency is emphasized during recording; 107 is an acoustic low-pass filter for removing components above 3 MHz from the RF multiplied signal; 108.111 is an acoustic band-pass filter for extracting the FM acoustic signal; 109.
112 is an acoustic FM demodulator that demodulates the audio signal, 110
．． 113 is an acoustic de-emphasis circuit that restores the audio signal whose high frequency is emphasized during recording; 114 is an EFM low-pass filter that extracts the EF'M acoustic signal from the RF multiplied signal; and 115 is an audio signal whose high frequency is emphasized. An EFM de-emphasis circuit 116 demodulates the EFM audio signal and detects data errors using a CIRC code;
117 is a separation circuit that separates the PCM audio signal into a 12-bit audio signal and a 4-bit binary code, and 118 demodulates the audio signal. Digital analog converter (hereinafter referred to as DA converter), 11
9. 120 is a digital acoustic low-pass filter that removes high frequency components that still remain after passing through the DA converter 118; 121 is a microcomputer that receives and processes the binary code; 122 is a reproduction stop signal sent to the reproduction means; It is a controller that generates.

The operation of the information recording medium reproducing apparatus of this embodiment configured as described above will be described below.

The optical video disk 101 is rotated using a spindle motor 1021, and the information recorded by the optical pickup 1022 is read. The read information is output as an RF multiplied signal. Since the output of the optical pickup is small, it is amplified through a preamplifier 1023 to a level that is easy to process.

The amplified RF signal is sent to the MTF correction circuit 103 and the EFM low-pass filter 114. MTF correction circuit 103
is a type of high-frequency compensation amplifier for compensating the frequency characteristics of the optical video disc "01," thereby obtaining an RF multiplied signal having the same characteristics as the spectrum during recording shown in FIG. The RF double signal video bandpass filter 104 and the FM acoustic low pass η·! corrected in this way! The signal is input to the wave generator 107. The video bandpass filter 104 is 3°5MH
A bandpass filter that passes signals from z to 15MHz.
The FM-modulated video signal is extracted from the doubled signal and output.

The FM-modulated video signal output from the video bandpass filter 104 is sent to the video FM demodulator 105 and demodulated into a video signal. Since the high frequency range of this demodulated video signal is emphasized by the pre-emphasis circuit during recording, the level of the high frequency range is lowered by the video de-emphasis circuit 106 in order to restore this to the original level, and the NTSC signal is reproduced. FM sound low pass or R input to R wave unit 107
Signals above 3 MHz of the F-fold signal are removed and sent to acoustic bandpass filters 108 and 111.

The acoustic bandpass filters 108 and 111 are bandpass filters with center frequencies of 2.3MHz and 12.8MHz, respectively, so that the center frequencies of 2-3MHz during recording,
Frequency deviation ±100 KHz and center frequency 2.8M
Hz, FM recorded at a frequency of 100KHz
A modulated acoustic signal is extracted. FM taken out
The modulated acoustic signals are each transmitted to an acoustic FM demodulator 109.
112 and demodulated into an acoustic signal. During recording, the high frequencies of this demodulated audio signal are emphasized by the pre-emphasis circuit, so in order to restore this, the level of the high frequencies is lowered by the audio de-emphasis circuits 110 and 113, and the normal audio signal is restored. will be played. The RF multiplied signal input to the EFM low-pass filter 114, the 2MH2 or higher signal, is removed, and an EF'M sound tube return signal is output. Since the high frequency range of this EFM audio signal is emphasized by the pre-emphasis circuit during recording, the level of the high frequency range is lowered by the EFM de-emphasis circuit 115 in order to restore the EFM sound signal to the normal EFM audio signal. The EFM acoustic signal output from the EFM de-emphasis circuit 115 is input to the digital signal processing circuit 116. The digital signal processing circuit 116 performs EFM demodulation of the EFM acoustic signal, detects and corrects data errors in the demodulated signal using CIRC codes, and converts the signal into a PCM acoustic signal, and no data error is detected. Or, if a data error is detected but can be corrected, a P signal is sent to the separation circuit 117.
A CM audio signal is output, and if a data error is detected and cannot be corrected, a data error detection signal is output to the controller 122. This data error detection signal is an I.
Interpolation Flag:
interpolation flag). Digital signal processing circuit 11
The PCM audio signal output from 6 has the f-order 4 bits as a binary code, and in order to extract this, the separation circuit 11
7 and separates into upper 12 bits and lower 4 bits. The separation circuit 117 is a switch circuit that sends the upper 12 bits to the DA converter 118 and the lower 4 bits to the microcomputer 12.
Output to 1. However, the data sent to the DA converter 118 is divided into separated 12-bit data and 100 binary numbers.
This is 16-bit data multiplied by 00. DA converter 1
18 inputs this 16-bit data, performs PCM demodulation, and outputs a two-channel analog audio signal.

The output analog audio signal enters digital acoustic low-pass filters 119 and 120, and when it passes through the DA converter 118, remaining high frequencies are removed and output as an analog audio signal. The microcomputer 121 receives the binary code from the separation circuit 117 and performs processing according to this binary code. When an uncorrectable data error occurs and the digital signal processing circuit 116 outputs a data error detection signal to the controller 122, the controller 122 stops the spindle motor 1021, stops reading the optical pickup 1022, and sends the error status to the microcomputer 121. The playback of the optical video disc 101 is stopped.

As described above, this embodiment includes a digital signal processing circuit 116 that detects uncorrectable data errors in binary codes recorded as digital data, and a digital signal processing circuit 116 that detects uncorrectable data errors in binary codes recorded as digital data, and when such errors are detected, plays back the optical disc 101. By providing the interrupt controller 122, it is possible to prevent malfunctions of the playback device caused by the microcomputer 121 inputting an incorrect control code.

FIG. 4 shows a block diagram of an information recording medium reproducing apparatus according to a second embodiment of the present invention.

In FIG. 4, 401 to 421 are 1 of the first embodiment.
Same as 01 to 121. 422 is a character output circuit that outputs a character signal when a data error occurs, and 423 is a superimposer that combines the video signal reproduced from the optical video disk and the character signal.

The operation of the information recording medium reproducing apparatus of this embodiment configured as described above will be explained below.

The operations other than when an uncorrectable data error in the EFM demodulated acoustic signal is detected are the same as in the first embodiment, and will therefore be omitted. When the digital signal processing circuit 416 detects an uncorrectable data error, it outputs a data error detection signal to the character output circuit 422. When the character output circuit 422 receives the data error detection signal, it outputs a character signal such as "A data error has occurred" and a switching signal to the superimposer 423. superimposer 4
23 synthesizes the NTSG signal output from the video de-emphasis circuit 406 and the character signal output from the character output circuit 422 by alternately switching them according to the switching signal from the character output circuit 422, Output a signal. The information recording medium of this embodiment records a video signal. Characters indicating the occurrence of a data error are combined with this video and output, so viewers can visually notice the occurrence of a data error and know that an abnormality may occur in the playback device due to this data error. Can be done.

As described above, according to this embodiment, the digital signal processing circuit 416 serves as a data error detection means for detecting uncorrectable data errors in binary codes recorded as digital data, and the Character output circuit 422 and superimposer 42 as data error processing means to visually inform the outside
3, the viewer can know in advance of the occurrence of an abnormality in the playback device caused by a data error, and furthermore, the occurrence of an abnormality can be notified visually without interfering with the reproduction of the audio signal. I can do it.

Next, a third example will be described. First, the information recording medium used in this example will be explained. In this example, the information recording medium is a compact disc (hereinafter referred to as
(referred to as a CD), audio information is used as information that is continuously output on the time axis, and binary code is used as digital data. FIG. 6 is a block diagram schematically showing a method for recording audio signals and digital data on a CD used in this embodiment.

The recording method will be described below. The two channels of acoustic signals are each filtered by low-pass filters 602 and 603.
Components higher than KHz are removed and the AD converter 604
, sampling frequency 44, 1 K Hz by Ef05
l It is converted into a PCM audio signal with a quantization bit count of 16 bits, and is time-axis multiplexed by a multiplexer 606. A CIRC code is added to the time-base multiplexed PCM audio signal by a CIRC adding circuit 607. Separately, control information such as time and address and binary code are input to subcode encoder 601. Here, processing such as adding a CRC code to the control information, adding a CIRC code to the binary code, and time axis multiplexing is performed, and a subcode signal is output.

What is CRC? Cyclic Redundancy
y C0de is a code added to detect data errors, similar to the CIRC code described above. The subcode signal thus generated and the CIRC-encoded PCM audio signal output from the CIRC addition circuit are time-domain multiplexed by a multiplexer 608 and sent to an EFM modulator 6.
Output to 09. EFM modulator 609 performs EFM modulation on the output of multiplexer 608 and outputs it to optical modulator 610 . The optical modulator 610 irradiates a signal onto the disk 611 in response to the signal from the EFM modulator 609 and records information. A CD playback device made in this manner will be described below.

FIG. 5 is a block diagram of an information recording medium reproducing apparatus according to a third embodiment of the present invention. In FIG. 5, 501 is a CD on which information is recorded by the method described above, 502 is a playback means, and a spindle motor 5021 rotates the CD 501.
, an optical pickup 5022 that reads out the RF multiplied signal from the CD 501, a preamplifier 5023 that amplifies the RF multiplied signal, and the like. 503 is a synchronization detection means for shaping the RF multiplied signal into a digital signal and detecting a synchronization signal; 504 is an E
An EFM demodulator demodulates the FM signal, 505 is a subcode separation circuit that separates a CIRC coded PCM audio signal and a subcode signal, 506 is a CIRC processing circuit that detects and corrects data errors using CIRC codes, and 507 is a PCM
A DA converter demodulates the audio signal, 508 and 509 are low-pass filters, 510 and 511 are synthesizers that combine the audio signal reproduced from the CD 501 and the audio signal from the audio generation circuit 513, and 512 is a subcode Separating the signal into control information and binary code, detecting data errors using a CRC code for the control information, detecting and correcting data errors using a CIRC code for the binary code,
A subcode decoder outputs a control signal, a binary code, and a binary code error occurrence signal; 513 is a sound generation circuit that generates an audio signal when a binary code data error occurs; 514 is a microcomputer that receives and processes the binary code. .

The operation of the information recording medium reproducing apparatus of this embodiment configured as described above will be described below.

A spindle motor 5021 is used to rotate the CD 501, and an optical pickup 5022 reads the recorded information. Since the output of the optical pickup is small, it is amplified through the preamplifier 5023 to a level that is easy to process. The amplified RF signal is sent to the waveform shaping circuit 503. The waveform shaping circuit 503 shapes the RF multiplied signal into a digital signal. The digital signal output from the waveform shaping circuit 503 is subjected to EFM demodulation by the EFM demodulator 504 and input to the subcode separation circuit 505. The subcode separation circuit 505 is a switch circuit that separates the time-axis multiplexed subcode signal and the CIRC encoded PCM audio signal by switching outputs. Separated CIR
A CIRC processing circuit 506 uses a CIRC code to detect and correct data errors in the C-coded PCM audio signal, and then a DA converter 507 converts it into a two-channel analog audio signal. The two-channel analog audio signals output from the DA converter 507 have components of 20 HKz or higher removed by low-pass filters 508 and 509, respectively, and are input to combiners 510 and 511. Also,
The subcode signal separated by subcode separation circuit 505 is input to subcode decoder 512. Subcode decoder 512 separates control information and binary code,
Data errors are detected using a CRC code for control information, data errors are detected and corrected using a CIRC code for binary code, and control information and a binary code are output. Further, if there is an uncorrectable data error in the binary code, a binary code error occurrence signal is output. The output binary code is sent to a microcomputer, which processes it accordingly. The binary code error occurrence signal is sent to the audio generation circuit 513. The sound generation circuit 513 consists of a data recording circuit that records an analog-to-digital converted acoustic signal such as "A data error has occurred" and a DA converter, and when it receives a binary code error occurrence signal, it records it in the data recording circuit. The digital audio signal is converted into an analog audio signal by a DA converter and synthesizer 510.511
Output to. In the synthesizer 510 and 511, the audio generation circuit 5
13 and a low pass filter 508.509
The audio signals from each are synthesized and output.

According to this embodiment, as shown in FIG. By providing the audio generating circuit 513 and synthesizers 510 and 511 that notify the user, it is possible to know in advance whether an abnormality has occurred in the playback device due to a data error in the binary code. In addition, since it is audibly notified to the outside, it is possible to know the occurrence of an abnormality in advance even when video signals are not handled, and when video signals are handled, it does not interfere with the reproduction of the video signals.

Note that an optical video disk was used as the information recording medium in the first and second embodiments, and a CD was used in the third embodiment. Any information recording medium may be used as long as it is capable of recording digital data and information that is continuously output without interruption on the time axis, such as by converting data into an audio signal and recording it.

In addition, the first and second embodiments use a method of recording digital data by replacing the lower 4 bits of a PCM audio signal, and the third embodiment uses a method of recording digital data as a subcode signal. However, there are many ways to multiplex information and digital data that are output continuously on the time axis, such as replacing all 16 bits of the PCM audio signal with digital data, or converting digital data into audio signals and recording them. Any recording method may be used as long as it can be digitized and recorded.

In addition, although the first, second, and third embodiments used the control code of a microcomputer built in the information recording medium reproducing device as digital data, for example, data necessary for processing performed by a microcomputer may be used. Time axis"
Any digital data may be used as long as it is auxiliary data for information that is input continuously without interruption.

In addition, in the second embodiment, a method of synthesizing a character signal with a reproduced video signal was used as a method of notifying the occurrence of a data error. Any method of visually informing the outside of the occurrence of a data error, such as displaying information on an external display device such as the device, may be used.

In addition, in the second embodiment, the text information "A data error has occurred" is used as the information displayed when a data error occurs, but for example, "An abnormality has occurred" or "Please turn off the power." It may be text information such as "Please press the rPLAY button", information other than text such as X, or any information that notifies the outside of the occurrence of a data error.

In addition, in the third embodiment, as a method of notifying the occurrence of a data error, an audio signal generated by the audio generation circuit 513 is transmitted to the CD.
Although we used a method of synthesizing the sound signal with the sound signal played back from the 501, there are other ways to improve the auditory sense, such as by switching all the sound signals output from the playback device, or by generating the sound from an external amplification device such as a loudspeaker. Any method may be used as long as it notifies the outside of the occurrence of a data error.

In addition, in the third embodiment, voice information such as "A data error has occurred" was used as the acoustic information that is generated when a data error occurs, but for example, "An abnormality has occurred" or "Please turn off the power." , please press the rsTOP button,” voice information, and non-voice information such as mechanical sounds.
Any type of device may be used as long as it notifies the outside of the occurrence of a data error.

Effects of the Invention - As explained above, according to the present invention, when an uncorrectable data error occurs in digital data that is multiplexed with information that is continuously output on the time axis and is recorded, the reproduction device It is possible to prevent malfunctions or to know in advance that an abnormality will occur in the playback device, which has great practical effects.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an information recording medium reproducing apparatus according to a first embodiment of the present invention, and FIG. 2 shows a recording method for an optical video disc used in the first and second embodiments of the present invention. FIG. 3 is a spectral diagram of information recorded on the optical video disc used in the first and second embodiments of the present invention, and FIG. 4 is a block diagram of the information recording medium in the second embodiment of the present invention. FIG. 5 is a block diagram of the information recording medium reproducing device according to the third embodiment of the present invention, and FIG. 6 is a block diagram of the reproducing device used in the third embodiment of the present invention.
FIG. 3 is a block diagram showing a recording method of D. 101... Video disc, 102... Playback means,
11E3.41f3...Digital signal processing circuit, 1
22... Controller, 422... Character output circuit,
423...Superimposer, 512...Subcode decoder, 513...Sound generation circuit, 510.511...Synthesizer.

Claims (3)

[Claims] (1) Information that is output continuously without interruption on the time axis,
An information recording medium reproducing apparatus for reproducing an information recording medium in which digital data as auxiliary data of the information is multiplexed and recorded, comprising a reproducing means for reproducing the information and the digital data from the information recording medium; separation means for separating the information and the digital data;
An information recording medium reproducing apparatus comprising at least a data error detection means for detecting a data error in digital data, and a data error processing means for interrupting reproduction of the information recording medium when a data error occurs. (2) Information that is output continuously without interruption on the time axis,
An information recording medium reproducing apparatus for reproducing an information recording medium in which digital data as auxiliary data of the information is multiplexed and recorded, comprising a reproducing means for reproducing the information and the digital data from the information recording medium; separation means for separating the information and the digital data;
An information recording medium reproducing apparatus comprising at least a data error detection means for detecting a data error in digital data, and a data error processing means for visually informing the outside of the occurrence of a data error when a data error occurs. (3) Information that is output continuously without interruption on the time axis,
An information recording medium reproducing apparatus for reproducing an information recording medium in which digital data as auxiliary data of the information is multiplexed and recorded, comprising a reproducing means for reproducing the information and the digital data from the information recording medium; separation means for separating the information and the digital data;
An information recording medium reproducing apparatus comprising at least a data error detection means for detecting a data error in digital data, and a data error processing means for audibly notifying the outside of the occurrence of a data error when a data error occurs.