JP2002222570A - Method and device for inspecting reproduction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for inspecting reproduction which enable an efficient and exact inspection by enabling visual recognition of the occurrence of an error. SOLUTION: By the reproduction inspection method, an abnormality generated when reproduction signals PS are read out from an information recording medium D and modulation processing and error correction processing are applied to the reproduction signals PS to generate decode signals DS being stored in data storage section 20 and the decode signals DS in the data storage section 20 are taken out to reproduce voice signals is detected. The number of write-in times for storing decode signals DS subjected to error correction processing into the data storage section 20, the number of decode signals DS whose errors can not be corrected and the number of read-out times for taking out the decode signals DS from the data storage section 20 are counted. Remaining amount of data indicating the remaining amount of decode signals DS stored in the data storage section 20 being calculated from the number of write-in times DSC and the number of read-out times ASC, and the number of decode signals DS whose errors can not be corrected NGC are displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproduction inspection method and apparatus for inspecting whether or not an audio signal recorded on an information recording medium can be output correctly.

[0002]

2. Description of the Related Art An optical disk such as a magneto-optical disk such as a mini disk (MD) or a compact disk is used as an information recording medium for recording music data.
When reproducing music data or the like stored on a magneto-optical disk or an optical disk, EFM modulation (Eight to
Fourteen Modulation) processing, AC
IRC (Advanced Cross Interl)
error correction processing using an eave read solo code (CIRC) or CIRC and ATRAC
(Adaptive Transform Acous
Tic Coding) A compression format decompression process or the like is performed, and an audio signal is output from a speaker or the like. On the other hand, if the music data is not correctly recorded on the information recording medium, or if the above-described various processes are not properly performed, a defect such as skipping or interruption of sound is generated in the output audio signal. Therefore, it is necessary to check whether the music data stored on the information recording medium can be properly recorded and reproduced.

[0003]

Therefore, a reproduction signal is recorded on an information recording medium, and the information recording medium is reproduced by a recording / reproducing device to determine whether audio data is properly recorded on the information recording medium. To inspect. Alternatively, an information recording medium for inspection on which a reproduction signal is recorded in an error-free state is reproduced to check whether signal processing is properly performed. In particular, the inspection of the signal processing device is performed at a shipping stage before being incorporated in a recording / reproducing device of an information recording medium such as an optical disk or a magneto-optical disk. Conventionally, whether or not the data recorded on the information recording medium can be normally reproduced, or whether or not the music data has been normally recorded on the information recording medium, is actually checked from the information recording medium. This is performed by a human listening to the reproduced sound and determining whether or not there is a skip in the sound.

[0004] When performing an auditory test, a reproduced signal used for the test is not normal music but a continuous sound (peep sound) of, for example, 1 kHz so that abnormalities such as skipping are easily detected.
This is performed using However, in order to detect an abnormality such as a skipping sound only by hearing, there is a problem that the inspector must continuously listen to a continuous sound of 1 kHz. In addition, when the occurrence of a skip is detected only by hearing, it may be difficult to determine whether or not the skip has occurred, and the reliability of the test may be reduced. further,
The inspector must keep listening to the inspection sound until the inspection of at least one device is completed, which causes a problem that the burden on the inspector increases.

Accordingly, the present invention solves the above-mentioned problems and makes it possible to visually recognize occurrence of an error with certainty, thereby improving the efficiency and accuracy of the inspection. It is intended to provide an inspection device.

[0006]

According to the first object of the present invention, a reproduced signal is read from an information recording medium,
Modulating the reproduced signal to generate a decoded signal, performing error correction on the decoded signal, storing the decoded signal in a data storage unit, extracting the decoded signal from the data storage unit, and reproducing an audio signal. In the reproduction inspection method for detecting an abnormality, while measuring the number of times of writing that is the number of times the decoded signal subjected to the error correction processing is stored in the data storage unit, and measuring the number of the decoded signals that could not be corrected, The number of times of reading out the decode signal from the data storage unit is measured,
The remaining number of data in the data storage unit calculated from the number of times of writing and the number of times of reading, and the number of the decode signals that could not be corrected are displayed. This is achieved by a reproduction inspection method that detects an abnormality based on the number of the decoded signals that cannot be corrected.

Further, according to the third aspect of the present invention, there is provided a modulation section for modulating a reproduction signal recorded on an information recording medium to generate a decoded signal, and an error correcting section for performing error correction processing on the decoded signal. A correction unit, a data storage unit that stores the decoded signal subjected to the error correction processing, and an audio output unit that outputs audio based on the decoded signal. In a reproduction inspection device for detecting an abnormality when an audio signal is taken out and reproduced, a read counter for measuring the number of times the decode signal is read from the data storage unit, and the decode signal subjected to an error correction process A write counter that measures the number of times of writing, which is the number of times that the data has been stored in the data storage unit, and the data that cannot be corrected as a result of the error correction. A non-correctable counter for measuring the number of read signals, a display unit for displaying the remaining amount of data in the data storage unit calculated from the number of times of writing and the number of times of reading, and the number of decode signals that could not be corrected. This is achieved by a regeneration inspection device having:

According to the first or third aspect of the present invention, the modulated and error-corrected decoded signal is stored in the data storage unit. Then, the decoded signal stored in the data storage unit is read out and reproduced as an audio signal. At this time, the number of times that the error correction process was performed but the error could not be corrected, the number of times that the decode signal was written to the data storage unit, and the number of times that the decode signal was read from the data storage unit are displayed on the display unit. Accordingly, the inspector visually checks the displayed number of times the error correction could not be performed and the remaining amount of data, and determines whether the reproduced audio signal has an abnormality such as a skipping sound or a cut-out sound. Is examined by hearing. In this way, the abnormality in the reproduction state can be visually inspected as well as auditory. In particular, according to the configuration of the second or fourth aspect, the error correction processing of the decoded signal and the writing and reading to and from the data storage unit are performed in sector units of the information recording medium. Therefore, the displayed number of times of error correction, number of times of writing, and number of times of reading indicate the number of sectors, respectively.

[0009]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 is a block diagram showing a preferred embodiment of a reproduction inspection apparatus according to the present invention. The reproduction inspection apparatus 1 will be described with reference to FIG. The reproduction inspection device 1 is, for example, an inspection device of the signal processing device 10. That is, the reproduction inspection device 1 inspects the signal processing device 10 mounted on a magneto-optical disk device or an optical disk device.
Therefore, the signal processing device 10 to be inspected is in a state where it is detachably mounted on the reproduction inspection device 1. Here, the information recording medium D used in the reproduction inspection apparatus 1 is in a state where an error-free inspection information signal is recorded. Further, an optical pickup 3 for reproducing an information signal from the information recording medium D is used without error. It should be noted that the present invention can also be used as a reproduction inspection apparatus 1 for detecting an error in an information signal recorded on the information recording medium D. At this time, the signal processing device 10 used in the reproduction inspection device 1 has no abnormality.

A reproduction inspection apparatus 1 shown in FIG. 1 includes a signal processing apparatus 10 to be inspected, a spindle motor 2, an optical pickup 3, an RF amplifier 4, a servo circuit 5, a data storage unit 20, a D / A converter 30, It has a display unit 40 and the like. The spindle motor 2 has a function of driving the information recording medium D to rotate at a constant linear velocity. The optical pickup 3 has a function of outputting a relatively low-level laser beam for detecting data from reflected light by the magnetic Kerr effect. The optical pickup 3 acquires the information signal recorded on the magneto-optical disk by detecting the return light. The optical pickup 3 outputs a high-level laser output for heating the recording track to the Curie temperature during recording. For this reason, the optical head 3 is equipped with a laser diode as a laser output unit, an optical system including a polarizing beam splitter and an objective lens, and a detector for detecting reflected light.

An RF amplifier 4 is connected to the optical pickup 3, and an information signal detected from the optical pickup 3 is supplied to the RF amplifier 4. R
The F-amplifier 4 performs an arithmetic operation on the supplied information signal to obtain a reproduction signal PS, a tracking error signal, a focus error signal, and groove information (absolute position information recorded as a pre-groove (wobbling groove) on the magneto-optical disk 1). ) Etc. are extracted. Further, the RF amplifier 4 sends the extracted reproduction signal PS to the encoder / decoder 11, and outputs the tracking error signal T
E, a function of sending a focus error signal FE to the servo circuit 5;

The servo circuit 5 has a function of generating various servo drive signals in response to a tracking error signal, a focus error signal, a track jump command and an access command from the system controller 14, and the like. The optical pickup 3 performs focus control and tracking control by the servo drive signal. further,
The servo circuit 5 detects the rotation speed of the spindle motor 2 sent from the system controller 14 based on the rotation speed detection information.
It has a function of controlling the spindle motor 2 at a constant linear velocity (CLV).

Next, the signal processing device 10 to be inspected will be described with reference to FIG. This signal processing device 1
0 is, for example, a DSP (Digital Signal Processor)
And the first encoder / decoder 1
1, a memory controller 12, a second encoder / decoder 13, a system controller 14, and the like. As will be described later, the first encoder / decoder 11
The reproduced signal PS sent from the amplifier 4 is EFM-demodulated to generate a decoded signal DS, and the decoded signal D
It has a function of performing error correction on S. Further, the first encoder / decoder 11 has a function of transmitting a decoded signal DS subjected to the EFM modulation processing and the error correction processing to the memory controller 12. Note that the first encoder / decoder 11 is, for example, a 1
Various processes are performed for each sector. Therefore, the decode signal DS is also stored in the data storage unit 20 in sector units.

The memory controller 12 has a function of writing the transmitted decode signal DS to the data storage unit 20. In particular, the memory controller 12 writes the decode signal DS to the data storage unit 20 for each sector. Also, the memory controller 12
It has a function of transmitting the decode signal DS stored in the data storage unit 20 to the second encoder / decoder 13 according to a command from the encoder / decoder 11. Here, the data storage unit 20 is, for example, a DRAM (DynamicRand).
om Access Memory)
The decode signal DS is managed and stored for each sector. The second encoder / decoder 13 has a function of performing a decompression process from a compression format on the decode signal DS sent via the memory controller 12 to generate a digital audio signal. This digital audio signal is a signal obtained by, for example, 44.1 kHz sampling and 16-bit quantization. The second encoder / decoder 13 has a function of sending a digital audio signal to the D / A converter 30.

The D / A converter 30 has a function of converting the sent digital audio signal into an analog audio signal. The display unit 40 includes a display device such as a liquid crystal display. Further, the display unit 40 displays the remaining data amount (= read count ASC−write count DSC) in the data storage unit 20 based on various information output from a read counter 105, a write counter 106, and an NG counter 107 described later. It has a function of displaying the NG count NGC. Audio output unit 50
Has a function of converting an analog audio signal output from an output terminal (not shown) from the D / A converter 30 via a predetermined amplification circuit unit into an audio signal and outputting the audio signal.

Next, an operation example of the reproduction inspection apparatus 1 will be briefly described with reference to FIG. For the information recording medium D rotated at a constant linear velocity by the spindle motor 2,
Laser light is emitted from the optical pickup 3. Then, an information signal is obtained in the optical pickup 3 by the return light from the information recording medium D. The information signal is arithmetically processed by the RF amplifier 4, and the extracted reproduction signal PS is sent to the first encoder / decoder 11. Then, in the first encoder / decoder 11, the reproduction signal PS is subjected to decoding processing such as EFM modulation and error correction to generate a decoded signal DS. After that, the decoded signal DS after the error correction is stored in the data storage unit 20 via the memory controller 12. The decode signal DS stored in the data storage unit 20 is sent to the second encoder / decoder 13 via the memory controller 12. In the second encoder / decoder 13, the decoded signal DS is demodulated from the compressed state to generate a digital audio signal. This digital audio signal is converted into an analog audio signal in the D / A converter 30, and an audio signal is output from the audio output unit 50.

FIG. 2 is a block diagram showing a preferred embodiment of the first encoder / decoder 11, and the first encoder / decoder 11 will be described with reference to FIG.
The first encoder / decoder 11 in FIG. 2 includes a clock extraction and pit dropout unit 101, a modulation unit 102, a frame synchronization unit 103, an error correction unit 104, and the like. The clock extraction and pit exit unit 101 outputs a bit clock synchronized with the transmitted reproduction signal PS to the frame synchronization unit 1.
03, a function of outputting to the error correction unit 104;
Further, the clock extraction and pit exit unit 101 has a function of transmitting the reproduced signal PS to the modulation unit 102.

The modulation section 102 converts the transmitted reproduction signal PS into an EFM (Eight to Fourteen M) signal.
and a function of outputting a reproduction signal PS to the memory controller 12. That is, the modulating unit 102 converts the transmitted 14-bit reproduction signal PS into 8b
It converts it to a decoded signal DS of the
3 is provided. Frame synchronization unit 103
Has a function of detecting a frame sync of the modulated decoded signal DS and outputting a frame clock.
The frame synchronization unit 103 detects the same frame sync pattern in the decoded signal DS due to the influence of dropout or jitter, or when the original frame sync is not detected, the window protection and frame sync for detecting the frame sync. It has a function of performing pattern interpolation processing.

The error correction section 104 reads out the decoded signal DS stored in the data storage section 20 and performs error correction. The error correction unit 104 has a function of outputting the decoded signal DS after correcting the error to the memory controller 12 and storing the decoded signal DS in the data storage unit 20.
The error correction unit 104 has a retry counter 104a.
Is provided, and the retry counter 104a has a function of measuring the number of times the same decode signal DS has been subjected to the error correction processing. Retry counter 104
“a” has a specified number of times of error correction RCref, and the error correction unit 104 stops the error correction process after performing the error correction process by the specified number of times RCref.

Here, error correction section 104 uses, for example, an ACIRC (Advanced C) as an error correction code.
Ross Interleaved Reed Solo
mon code). The error correction process using ACIRC is an error correction process using a C1 sequence and a C2 sequence, as is known. Error correction unit 1
In step 04, for example, error detection is performed on the decoded signal DS using the C1 sequence, and if error correction is possible within the C1 sequence, error correction is performed at this stage. Also,
If error correction is not possible even with the C1 sequence, error detection is performed with the C2 sequence, and if it is determined that error correction with the C2 sequence is possible, error correction processing is performed. If it is determined that the error correction cannot be performed even by the error detection process using the C2 sequence, the error correction for the decoded signal DS is disabled.

A read counter 105, a write counter 106, and an NG counter (uncorrectable counter) 107 are connected to the error correction unit 104. The read counter 105 counts the number of read times ASC when the decode signal DS stored in the data storage unit 20 is sent to the second encoder / decoder 13. The write counter 106 counts the number of times of writing DSC when the decoded signal DS after error correction by the error correction unit 104 is stored in the data storage unit 20. The NG counter 107 decodes the decoded signal DS which has been subjected to the error correction process by the error correction unit 104 but has failed to correct the error.
The number of NG times NGC, which is the number of NGs, is measured.

Here, the information recording medium D
And the modulation unit 102 and the error correction unit 104 perform EFM modulation processing and error correction processing on a sector-by-sector basis. Therefore, the number of writing DSC, the number of reading ASC, and the number of NG NGC each represent the number of sectors. Also, a read counter 105, a write counter 106, an NG counter (uncorrectable counter) 107
Are the read count ASC and the write count DS, respectively.
It has a function of outputting C and the NG count NGC to the system controller 14 via the output interface 108. Then, the system controller 12 outputs the remaining data amount obtained by subtracting the number of read times ASC from the number of write times DSC to the display unit 40.

More specifically, FIG. 3 is a schematic diagram showing the data structure in the data storage unit 20. When the decode signal DS is written to the data storage unit 20 in FIG. Only one increase. That is, the data remaining amount of the decode signal DS stored in the data storage unit 20 is increased. On the other hand, the decoded signal DS stored in the data storage unit 20 is transmitted to the second encoder / decoder 13
, The read count ASC increases by one. That is, the decode signal D stored in the data storage unit 20
The remaining data amount of S is reduced. Therefore, the remaining amount of data in the data storage unit 20 is the number obtained by subtracting the number of readings ASC from the number of writings DSC.

At this time, if the error correction processing is performed several times for the same decode signal DS, the decode signal DS is not written in the data storage unit 20, but the data storage unit 2
From 0, the decode signal DS is read to the second encoder / decoder 13. Therefore, the remaining data amount decreases. Then, when the remaining amount of data is exhausted, an abnormality such as sound interruption occurs. Therefore, the remaining data amount and the NG count NGC are displayed on the display unit 40.
, The abnormality can be visually detected.
As a result, even if an abnormality such as skipping of sound or interruption of sound is overlooked, information indicating an error is displayed on the display unit 40, so that the accuracy of the inspection can be improved. Also,
Even if the inspector stops listening to the sound for a short time, the display 40
, It is possible to detect an error, so that the inspection can be performed easily and efficiently.

FIG. 4 is a flowchart showing a preferred embodiment of the reproduction inspection method of the present invention.
The reproduction inspection method will be described with reference to FIG. First, a reproduction signal PS is sent from the optical pickup 3 and the RF amplifier 4 to the first encoder / decoder 11. Then, the first
In the encoder / decoder 11, a bit clock is extracted from the reproduction signal PS. The reproduction signal PS is sent to the modulation unit 102. Thereafter, in the modulation step ST1, the reproduction signal PS is EFM-modulated by the modulation section 102, and the generated decoded signal DS is sent to the frame synchronization section 103. Then, after the frame synchronization section 103 generates a frame clock based on the decode signal DS, the decode signal DS is sent to the error correction section 104.

Then, in error correction step ST 2, error correction of decoded signal DS is performed in error correcting section 104, and decoded signal DS after error correction is stored in data storage section 20 via memory controller 12. Here, from the optical pickup 3 to the data storage unit 20
Until the playback signal is stored, for example, 1.41 Mbit.
/ Sec. Further, the number of times of writing DSC and the number of NGs NGC are measured by the writing counter 106 and the NG counter 107, respectively, and are sent to the system controller 14.

Thereafter, in step ST3, the decoded signal PS stored in the data storage section 20 is sent to the second encoder / decoder 13. At this time, the read count ASC of the data storage unit 20 is measured by the read counter 105 and sent to the system controller 14.
At this time, the display unit 40 displays the NG count NGC and the remaining data amount (= DSC-ASC) in step ST4. Here, the memory controller 12 sends the reproduction data written in the data storage unit 20 to the second encoder / decoder 13 at a timing of, for example, 0.3 Mbit / sec. As described above, since the writing speed is higher than the reading speed, the data storage unit 20 is normally used.
Is always in a state where the remaining amount of the decode signal DS remains over a certain level. On the other hand, the decoded signal D
If S is not written, the remaining amount of data (= DSC-AS
When C) becomes 0 and the decoded signal DS stored in the data storage unit 20 is exhausted, an abnormal sound break occurs.

Then, in step ST5, the decoded signal PS compressed in ATRAC format is converted into a digital audio signal by the second encoder / decoder section 13. Thereafter, in step ST6, the digital audio signal is D / A converted, and an audio signal is output. The inspector inspects for abnormalities such as skipping or interruption of sound based on the output audio signal and the display of the remaining data amount and the number of NG times NGC on the display unit 40, and checks whether the signal processing device 10 is functioning properly. Determine whether or not.

FIG. 5 is a flowchart showing an operation example of the NG counter and the write counter in the error error correction in step ST2. The operation example of the write counter 106 and the NG counter 107 will be described with reference to FIG. I do. First, in step ST11, the error-corrected decoded signal DS is stored in the data storage unit 2.
It is determined whether it is time to write 0. Then, when it becomes a writable timing, the error correction unit 104 writes the decode signal DS for one sector into the data storage unit 20 in step ST12. At this time, even if the decoded signal DS cannot be corrected by the error correction, the decoded signal DS including the error is written to the data storage unit 20. Then, the write counter 106 increases the write count DSC by one (DSC = DSC + 1).

Thereafter, in step ST13, it is determined whether or not a problem has occurred in the error correction unit 104 such that the error of the decoded signal DS cannot be corrected or the data cannot be written to the data storage unit 20. If the error correction or the like has been properly performed, the processes of steps ST11 to ST19 are performed for the next sector. When the inspection of all the sectors of the generated signal PS is completed, the inspection ends.

On the other hand, if error correction or the like cannot be performed properly, the number of retries RC set by the retry counter is reduced by one in step ST14 (RC =
RC-1). Then, in step ST15, it is determined whether or not the number of retries RC has become zero. When the number of retries RC is not 0, in step ST16, the number of writes DSC is decreased by one by the write counter. This is obtained by adjusting the increase in the number of times of writing DSC when writing to the data storage unit 20 in step ST12. Thereafter, in step ST17, the reproduction signal PS is again obtained by the optical pickup 3, the EFM modulation by the modulator 102 and the error correction
4 is performed. Until the number of retries RC becomes 0, writing to the data storage unit 20, error detection, and the like are repeated (steps ST11 to ST11).
Step ST19).

On the other hand, when the number of retries RC becomes 0, in step ST18, the NG counter 107 increases the NG number NGC by one (NGC = NG).
C + 1). After that, the retry count RC is reset,
In step ST17, the initial value is set to RCref. Then, for example, until one song ends, step S
The operation of T11 to step ST19 is repeated, and when one song is completed, the number of times of writing DSC, the number of times of reading ASC and NG
The number NGC is reset.

According to the above embodiment, the remaining data amount (=
The display unit 4 displays the number of write operations DSC-the number of read operations ASC) and the number of NG times NGC, which is the number of decode signals DS that could not be corrected.
By displaying 0, whether or not an abnormality has occurred can be confirmed visually as well as visually. Therefore, it is possible to detect the abnormality much more reliably than when the test is performed only by hearing. Also, if it is the same song for a while,
The playback state can be checked even when the user takes his / her eyes off, and the inspector can easily detect an error. Also, 1k
It is not necessary for the inspector to keep listening to the audio signal for error detection consisting of a continuous sound (peep sound) such as Hz, and the playability check can be performed by music.

The embodiment of the present invention is not limited to the above embodiment. In FIG. 2, the read counter 105
Although the write counter 106 is provided in the first encoder / decoder 11, it may be provided in the memory controller 12. Also, in FIG.
The data storage unit 20 and the D / A converter 30 may also be provided in the signal processing device 10. Further, in the above-described embodiment, for example, the inspection apparatus 1 of the signal processing apparatus 10 for a magneto-optical disk such as a mini disk system is exemplified, but the signal processing apparatus used for the recording and reproducing apparatus of the optical disk, or the recording and reproducing apparatus It may be used as its own inspection device. Further, in the above-described embodiment, a disc-shaped information recording medium such as a magneto-optical disc or an optical disc is exemplified. Signal processing device 1 for processing signals
It can also be used for 0 inspection.

[0036]

As described above, according to the present invention,
By making it possible to visually recognize the occurrence of an error, it is possible to provide a reproduction inspection method and a reproduction inspection apparatus capable of improving inspection efficiency and accuracy.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a preferred embodiment of a reproduction inspection apparatus according to the present invention.

FIG. 2 is a block diagram showing a preferred embodiment of the signal processing device of the present invention.

FIG. 3 is a schematic diagram showing a recording state of a data storage unit in the reproduction inspection device of the present invention.

FIG. 4 is a flowchart showing a preferred embodiment of the reproduction inspection method of the present invention.

FIG. 5 is a flowchart showing a preferred embodiment of the reproduction inspection method of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reproduction inspection apparatus, 10 ... Signal processing apparatus, 20
... Data storage unit, 40 ... Display unit, 102 ...
Modulation unit, 104: error correction unit, 105: read counter, 106: write counter, 107
..NG counter (uncorrectable counter), DSC ...
Number of writing, ASC: Number of reading, NGC: Number of NG

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 20/10 321 G11B 20/10 321Z

Claims (4)

[Claims] 1. A reproduction signal is read from an information recording medium,
Modulating the reproduced signal to generate a decoded signal, performing error correction on the decoded signal, storing the decoded signal in a data storage unit, extracting the decoded signal from the data storage unit, and reproducing an audio signal. In the reproduction inspection method for detecting an abnormality, the number of times of writing, which is the number of times the decoded signal subjected to the error correction processing is stored in the data storage unit, is measured.
The number of the decode signals that could not be corrected was measured, the number of read times that was the number of times the decode signal was taken out from the data storage unit was measured, and the data storage unit calculated from the number of write times and the number of read times The remaining amount of data and the number of the decoded signals that could not be corrected are displayed. Based on the audio signal and the displayed remaining amount of data and the number of the decoded signals that could not be corrected, an abnormality was detected. A regeneration inspection method characterized by detecting. 2. The method according to claim 1, wherein the error correction of the decoded signal and the writing and reading of the decoded signal to and from the data storage unit are performed for each sector in the information recording medium. Reproduction inspection method. 3. A modulation section for modulating a reproduction signal recorded on an information recording medium to generate a decode signal, an error correction section for performing error correction processing on the decoded signal, and the decode signal having been subjected to error correction processing. A data storage unit for storing
An audio output unit that outputs audio based on the decode signal; and a reproduction inspection device that detects an abnormality when the audio signal is reproduced by extracting the decode signal from the data storage unit. A read counter that measures the number of reads that is the number of times the decode signal has been read from the unit, a write counter that measures the number of writes that is the number of times that the decode signal that has undergone error correction processing is stored in the data storage unit, As a result of the error correction, an uncorrectable counter measuring the number of the decode signals that could not be corrected, a data remaining amount of the data storage unit calculated from the number of times of writing and the number of times of reading, and A display unit for displaying the number of the decoded signals. 4. The error correction section performs an error correction process on the decoded signal for each sector, and writes and reads out the decoded signal for each sector in the data storage section. The regeneration inspection apparatus according to claim 3, wherein