JP2000243031A - Information recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect always properly the termination of the old information recorded on an information recording medium. SOLUTION: This information recorder is constituted so that a synchronizing pattern is detected from an old information reproduction signal by a synchronizing pattern detecting circuit 1 to convert the reproduced signal to data of 8 bit unit, and by an ID error detecting circuit 6, the ID and the ID information error correcting code are detected for the error detection from each datum of 8 bit unit and sector address data in the ID are extracted and outputted with an error flag A resulted from the error detection, and a prepit signal is made the data of 8 bit unit and outputted, and the error of prepit data is detected by a prepit error detecting circuit 8 to output ECC block address data together with an error flag B, and the count value displaying the sector address is counted by a 3rd counter 5 to judge the error flags A and B, then the process for setting the address to the 3rd counter 5 is carried out by an address selecting circuit 9 to detect the termination of the old information in accordance with the detected sector address and a sync frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording apparatus for recording information on an information recording medium such as an optical disk and adding new information continuously to the old information already recorded on the information recording medium. And the like.

[0002]

2. Description of the Related Art Conventionally, when new information is added and recorded continuously to old information already recorded on an information recording medium,
An information recording device such as an optical disk recording device that simply reads out and detects the old information when detecting the end of the old information (for example,
JP-A-9-270171).

[0003]

However, in the conventional information recording apparatus as described above, when new information is added and recorded continuously to the old information recorded on the information recording medium, the old information is simply read out and terminated. However, there is a problem that normal operation is not performed if there is an error in the read information.

[0004] The present invention has been made in view of the above points, and there is an error in the read information at the time of detecting the end when adding new information continuously to the old information recorded on the information recording medium. It is another object of the present invention to correctly detect the end of old information.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides auxiliary information comprising upper address information indicating the order of a plurality of pieces of divided information divided into units of a predetermined amount and error correction information thereof. Is recorded in advance on an information recording medium,
The information is divided into a plurality of pieces of divided information based on the above unit, each divided information is divided into N (N is a natural number), and information obtained by combining a lower address and an upper address indicating the order of N pieces of divided information is obtained. The following means is provided in an information recording apparatus for adding the error correction information and further adding delimiter information indicating a delimiter obtained by dividing each of the N pieces of divided information into M (M is a natural number).

Spare information reproducing means for reproducing the preliminary information on the information recording medium; error correction information detecting means in the preliminary information for detecting error correction information in the preliminary information reproduced by the means; Information reproducing means for reproducing the information recorded in the section, delimiter information detecting means for detecting delimiter information of each divided information from the information reproduced by the means, and counting the number of times the delimiter information detected by the means is detected A delimiter information detection frequency counting means is provided.

Further, an error detecting means for detecting upper and lower address information of each divided information in the information recorded on the information recording medium and its error correction information, and detecting an error thereof; High-order address information reproduced by the means, delimiter information detected by the delimiter information detection means, detection results detected by the error correction information detection means in the preliminary information and the error detection means, and the number of times of delimitation information detection The upper and lower addresses of each divided information of the information being reproduced are determined based on the number of times of detection of the delimiter information counted by the counting means, and based on the determination, the end of the information recorded on the information recording medium is determined. An end position detecting means for detecting a position is provided, and new information is additionally recorded continuously at the end position of the information recorded on the information recording medium. It is obtained by the.

Further, in order to achieve the above object, according to the present invention, preliminary information including upper address information indicating the order of a plurality of pieces of divided information divided into units of a predetermined amount and error correction information thereof is recorded in advance. In the information recording medium, the information is divided into a plurality of pieces of divided information based on the above unit, each divided information is divided into N (natural numbers), and a lower address and an upper address indicating the order of the N pieces of divided information are stored. In an information recording apparatus for adding combined information and its error correction information, and adding and adding delimiter information indicating a delimiter obtained by dividing each of the N pieces of divided information into M (natural numbers), the following means are provided. Also provide things.

A preliminary information reproducing means for reproducing the preliminary information on the information recording medium, an error correcting means in the preliminary information for correcting error correction information in the preliminary information reproduced by the means, and a recording on the information recording medium. Information reproducing means for reproducing the reproduced information, delimiter information detecting means for detecting delimiter information of each divided information from the information reproduced by the means, and delimiter information for counting the number of times the delimiter information detected by the means is detected A detection number counting means is provided.

[0010] Further, error correction means for detecting upper and lower address information of each divided information in the information recorded on the information recording medium and its error correction information, and correcting the error, and Upper address information in the preliminary information corrected by the error correcting means, upper and lower address information corrected by the error correcting means, information indicating whether or not each error can be corrected, and the delimiter information The upper and lower addresses of each divided information of the information being reproduced are determined based on the number of times of detection of the delimiter information counted by the number of detections counting means, and the information recorded on the information recording medium is determined based on the determination. End position detection means for detecting the end position of the information recording medium, and new information is additionally recorded continuously at the end position of the information recorded on the information recording medium. That.

[0011]

Embodiments of the present invention will be specifically described below with reference to the drawings. The information recording apparatus according to the embodiment of the present invention uses a known recording information data format (see, for example, FIGS. 1 and 2 of JP-A-9-270171). Here, the variables N and M of the division number according to the present invention are N = 16 and M = 26, respectively.

The overall configuration of the information recording apparatus is substantially the same as that of a known apparatus (for example, see Japanese Patent Laid-Open No. 9-2).
The configuration is substantially the same as that of the device described in FIG. 3 of Japanese Patent No. 70171, and the circuit of FIG. 1 or FIG. 5 of the embodiment of the present invention described later is provided instead of the decoder and pre-pit signal decoder of FIG. Therefore, only the circuit portion for detecting the end of the recording medium according to the present invention will be described below.

First, the data format of the pre-pit signal will be described. For example, a DVD-R disc is
A groove for recording information (referred to as "groove") is formed in a meandering manner ("wobble"), and the information recording apparatus has a constant meandering frequency due to the groove during information recording. The DVD-R disc is rotated at a constant linear velocity by performing servo control as described above.

In the DVD-R disc, a pre-pit signal, which is preliminary information, is recorded in advance between grooves (hereinafter referred to as "land") in order to detect an address on an unrecorded disc. Have been.

FIG. 2 is a diagram showing a positional relationship among data to be recorded on a DVD-R disc, a wobble signal, and a pre-pit signal. FIG. 3 is a diagram showing a data format of a conversion table used to convert 3-bit data into 1-bit data.

[0016] As shown in FIG.
A wobble signal of a cycle corresponds to the first three cycles of the even or odd sync frame. The land pre-pit signal: P indicates a thin pulse signal, and indicates "1" and "0" depending on the presence or absence of the pulse signals of b2, b1, and b0. In the drawing, the presence of a pulse signal is indicated by a solid line, and the absence of a pulse signal is indicated by a broken line. Here, each pulse signal b2, b1,
b0 indicates “111”, and the pulse signals b2, b1, and b0 of the sync frame 2 indicate “100”. The 3-bit data is converted into 1-bit data according to the conversion table shown in FIG. That is, the 3-bit data “111” “100” shown in FIG. 2 is converted by the conversion table shown in FIG.

FIG. 4 is a diagram showing a data structure in which converted 13-bit data in one sector (26 (= M) sync frame) is represented by one ECC block (16 (= N) sectors). As described above, the ECC block address and the parity data for error correction are represented by 8 bits of bits 5 to 12, and error detection and error correction can be performed. The preliminary information based on the pre-pit signal indicates an ECC block address, and the recorded information includes a sector address (EC
(An address obtained by adding 4 bits to the lower part of the C block address).

Next, a description will be given of a first embodiment of the information recording apparatus according to the present invention. FIG. 1 shows a first embodiment of the information recording apparatus of the present invention.
FIG. 3 is a diagram illustrating a circuit configuration of an example.

This information recording apparatus is realized by a microcomputer including a CPU, a ROM, a RAM, and the like, and includes a reproducing unit 20 including a pickup (not shown), a laser diode, a polarizing beam splitter, an objective lens, a photodetector, and the like. It comprises a synchronization pattern detection circuit 1 for detecting a synchronization pattern (header) from a reproduction signal of a DVD-R disc, and an 8/16 demodulation circuit 2 for converting 16-bit data after the synchronization pattern into 8 bits.

Further, it has a first counter 3 for counting the number of data after the synchronization pattern, a second counter 4 for counting the number of times the synchronization pattern is detected, and a third counter 5 for counting sector addresses.

Further, an ID error detecting circuit 6 for detecting an error of ID data including a sector address, a prepit data reproducing circuit 7 for reproducing a prepit signal as data of 8-bit unit, and an error of the prepit data are detected. A prepit error detection circuit 8 and an address selection circuit 9 for inputting a sector address by ID and an address by prepit data and setting the third counter 5 when the address is correct.

That is, the information recording apparatus according to the first embodiment has higher-order address information (ECC block address) indicating the order of a plurality of pieces of divided information divided into units of a predetermined amount.
The information is divided into a plurality of pieces of divided information based on the unit on an information recording medium in which spare information including the error correction information and the spare information is recorded in advance, and each divided information is divided into N (= 16).
Information obtained by combining the lower address and the upper address indicating the order of the divided information and the error correction information thereof are added, and the above-mentioned divided information is further added with delimiter information indicating the delimiter obtained by dividing M (= 26). It is a device for recording.

The circuit includes a spare information reproducing means (reproducing section 20 and pre-pit data reproducing circuit 7 fulfilling its function) for reproducing the preliminary information on the information recording medium;
Means for detecting error correction information in the preliminary information reproduced by the means (the pre-pit error detection circuit 8 fulfills its function); and reproducing the information recorded on the information recording medium. Information reproducing means (the reproducing unit 20 fulfills its function), delimiter information detecting means for detecting delimiter information of each divided information from the information reproduced by the means (the synchronous pattern detecting circuit 1 fulfills its function), A delimiter information detection frequency counting means (second delimiter) for counting the number of delimiter information detections detected by the means.
Counter 4 performs its function).

An error detecting means (ID error detecting circuit 6) for detecting upper and lower address information of each divided information in the information recorded on the information recording medium and error correction information thereof and detecting the error. Performs its function), upper address information reproduced by the preliminary information reproducing means, delimiter information detected by the delimiter information detecting means, and error correction information detecting means in the preliminary information and the error detecting means. The upper and lower addresses of each piece of divided information of the information being reproduced are determined based on the detected detection result and the number of times of detection of the pieces of delimiter information counted by the above-described section information detection number counting means (the determination function is the third The counter 5 and the address selection circuit 9 perform the operation, and based on the determination, detect the end position of the information recorded on the information recording medium.置検 out means (CP, not shown
U performs its function), and additionally records new information continuously at the end position of the information recorded on the information recording medium.

Next, a description will be given of a circuit operation for detecting the end of old information when new information is continuously recorded on a DVD-R disc having old information already recorded in the above circuit.

First, on the DVD-R disc, preliminary information including a high-order address, which is low-precision position information, is recorded, and a low-order address is added to the information to be recorded together with the high-order address. In information recording devices, DVD
An operation of reproducing the old information and the pre-pit signal on the R disk is performed, and each signal is input to the circuit as binary data. This circuit detects a synchronization pattern (header) from an old information reproduction signal by a synchronization pattern detection circuit 1,
When the synchronization pattern is detected, the reproduced signal is converted into 8-bit data by the 8/16 demodulation circuit 2 therefrom.

Further, the ID and ID information error correction code (IEC) is detected from the data in units of 8 bits by the ID error detection circuit 6 to perform error detection, and the sector address data in the ID is extracted to detect the error. The result is output together with the resulting error flag A (1: error, 0: no error).

On the other hand, the pre-pit data reproducing circuit 7 converts the pre-pit signal into 8-bit data (the above-mentioned bit).
5 to 12), the error is detected in the pre-pit data by the pre-pit error detection circuit 8, and the error flag B (1: error, 0: no error) and EC are output.
Outputs C block address data.

In the above processing, if there is an abnormality in the reproduction signal due to various noises, scratches on the disk, dirt, or the like, the synchronization pattern cannot be detected, or an error occurs in the sector address or the ECC block address. appear. As a countermeasure, a first counter 3, a second counter 4, and a third counter 5 are used.

First, the first counter 3 counts the number of data after detecting the synchronization pattern. This first counter 3
Is set to "1" once the synchronization pattern is detected by the synchronization pattern detection circuit 1, sequentially added to count the number of data, and outputs a signal when the number reaches "91 (the number of data in one sync frame)". Then, "1" is set again.

Next, the second counter 4 counts the number of detected synchronization patterns. This second counter 4
If the first synchronization pattern of one sector is detected by the synchronization pattern detection circuit 1 via the OR circuit 10, "1" is set, and the next synchronization pattern is detected or a signal from the first counter 3 is output. Then, the count value is incremented.

When the counter value reaches "26 (the number of synchronization patterns in one sector)", "1" is set, and a signal for incrementing the count value is output to the third counter 5. The output of the second counter 4 makes it possible to detect a sync frame of arbitrary land pre-pit data.

Next, the third counter 5 counts a count value indicating a sector address. When the error flag A = 0, the third counter 5 sets the sector address data regardless of the error flag B. If the error flag A = 1 and the error flag B = 0, an ECC block address is set.

The ECC block address is an address in units of 16 sectors. Since there is no information of the lower 1 digit (4 bits) of the sector address in hexadecimal notation, the lower 4 bits store the count value of the third counter 5. I do. further,
When the error flag A = 1 and the error flag B = 1, the count value is incremented by a signal from the second counter 4.

Then, an error flag A and an error flag B
And the third counter 5 is determined by the address selection circuit 9.
Is performed to set an address. Therefore, the information recording apparatus can detect the end of the old information based on the sector address and the sync frame detected by the circuit.

In this way, there is provided means for detecting an error in the preliminary information on the information recording medium, detecting an error in the address information of the recorded division information, and counting the number of times the division information division is detected. If there is no error, the end of the detected record information can be determined to be correct, and if there is an error, the end of the record information can be determined from the counting means. Can be detected. Further, since only error detection is performed without performing error correction, the circuit scale can be reduced.

Next, a description will be given of a second embodiment of the information recording apparatus according to the present invention. FIG. 5 shows a second embodiment of the information recording apparatus of the present invention.
FIG. 2 is a diagram showing a circuit configuration of the embodiment, in which an ID error detection circuit 6 and a prepit error detection circuit 8 in the circuit of FIG. 1 are replaced with an ID error correction circuit 11 and a prepit error correction circuit 12, respectively. The circuit of the second embodiment has only the above-described difference, and other circuit operations are the same as those in FIG.

That is, the circuit of the second embodiment comprises a spare information reproducing means for reproducing the preliminary information on the information recording medium (the pre-pit data reproducing circuit 7 and the reproducing section 20 perform its function), and the means. Error correction means in the preliminary information (the pre-pit error correction circuit 12 fulfills its function) for correcting the error correction information in the preliminary information reproduced by the information reproducing means for reproducing the information recorded on the information recording medium ( The reproducing unit 20 fulfills its function), delimiter information detecting means (the synchronous pattern detecting circuit 1 fulfills its function) for detecting delimiter information of each divided information from the information reproduced by the means, And a delimiter information detection frequency counting means (the second counter 4 performs its function) for counting the number of times the delimiter information is detected.

Further, an error correction means (ID) for detecting the (sector) address of each divided information in the information recorded on the information recording medium and its error correction information and correcting the error.
The error correction circuit 11 fulfills its function) and the EC in the preliminary information corrected by the preliminary information error correcting means.
A C block address, an ECC block address corrected by the error correction means, information indicating whether or not each error can be corrected, and the number of times of detection of the break information counted by the break information detection number counting means (The determination function is performed by the third counter 5 and the address selection circuit 9).
And a terminal position detecting means (a CPU not shown performs its function) for detecting a terminal position of the information recorded on the information recording medium based on the judgment. New information is additionally recorded continuously at the end position of the information recorded on the recording medium.

Therefore, according to this circuit, the error flag A and the error flag B become "0" when the error can be corrected, and the corrected sector address data and the EC are corrected.
C block address data can be output. On the other hand, if the error cannot be corrected, the error flag A
And the error flag B becomes "1".

When there is no error, the error flag A and the error flag B become "0", and the sector address data and the ECC block address data can be output as they are.

As described above, the ID error correction circuit 11 and the pre-pit error correction circuit 12 are provided, and the error correction of the converted data of the 8/16 demodulation circuit 2 and the error correction of the reproduced data of the pre-pit data reproduction circuit 7 are performed. Further, the reliability of the end detection accuracy of the recorded information can be further improved.

In this embodiment, the process of detecting the end of recorded information on a DVD-R disc has been described. However, the information recording apparatus of the present invention can be similarly applied to other recordable discs. it can.

[0044]

As described above, according to the information recording apparatus of the present invention, the information read out at the end detection when the new information is additionally recorded continuously with the old information recorded on the information recording medium. Even if there is an error, the end of the old information can be correctly detected.

[Brief description of the drawings]

FIG. 1 is a diagram showing a circuit configuration of a first embodiment of the information recording apparatus of the present invention.

FIG. 2 is a diagram showing a positional relationship among data recorded on a DVD-R disc, a wobble signal, and a prepit signal.

FIG. 3 is a diagram showing a data format of a conversion table used to convert 3-bit data into 1-bit data.

FIG. 4 shows converted 13-bit data in one sector (26 sync frames) in one ECC block (16 sectors).
It is a figure which shows the data structure expressed in minutes.

FIG. 5 is a diagram showing a circuit configuration of a second embodiment of the information recording apparatus of the present invention.

[Explanation of symbols]

 1: Synchronous pattern detection circuit 2: 8/16 demodulation circuit 3: First counter 4: Second counter 5: Third counter 6: ID error detection circuit 7: Prepit data reproduction circuit 8: Prepit error detection circuit 9: Address Selection circuit 10: OR circuit 11: ID error correction circuit 12: Prepit error correction circuit 20: Reproduction unit

Claims (2)

[Claims] 1. An information recording medium in which spare information including upper address information indicating the order of a plurality of pieces of divided information divided into units of a predetermined amount and error correction information thereof is recorded in advance.
The information is divided into a plurality of pieces of divided information based on the unit, each divided information is divided into N (N is a natural number), and information obtained by combining a lower address and an upper address indicating the order of N pieces of divided information is An information recording apparatus which adds the error correction information and further adds delimiter information indicating a delimiter obtained by dividing each of the N pieces of divided information into M (M is a natural number), and reproduces the preliminary information on the information recording medium. Preliminary information reproducing means for reproducing, error correction information in preliminary information detecting error correction information in the preliminary information reproduced by the means, information reproducing means for reproducing information recorded on the information recording medium, Delimiter information detecting means for detecting delimiter information of each divided information from the information reproduced by the means, and a delimiter information detection count for counting the number of detections of the delimiter information detected by the means Error detection means for detecting upper and lower address information of each divided information in the information recorded on the information recording medium and the error correction information thereof, and detecting the error; and Reproduced upper address information, delimiter information detected by the delimiter information detection means, and detection results respectively detected by the preliminary information error correction information detection means and the error detection means,
The upper and lower addresses of each divided information of the information being reproduced are determined on the basis of the number of times of detection of the delimiter information counted by the delimiter information detection number counting means, and recorded on the information recording medium based on the determination. End position detection means for detecting the end position of the information recorded, and new information is additionally recorded continuously at the end position of the information recorded on the information recording medium. Recording device. 2. An information recording medium in which spare information including upper address information indicating the order of a plurality of pieces of divided information divided into units of a predetermined amount and error correction information thereof is recorded in advance.
The information is divided into a plurality of pieces of divided information based on the unit, each piece of divided information is divided into N (natural numbers), and information obtained by combining a lower address and an upper address indicating the order of N pieces of divided information and an error thereof. An information recording apparatus for adding correction information and adding delimiter information indicating a delimiter obtained by dividing each of the N pieces of divided information into M (natural numbers), and recording the preliminary information on the information recording medium. Means, error correction means in the preliminary information for correcting the error correction information in the preliminary information reproduced by the means, information reproducing means for reproducing the information recorded on the information recording medium, and information reproduced by the means Delimiter information detecting means for detecting delimiter information of each piece of split information from information; delimiter information detection number counting means for counting the number of detections of delimiter information detected by the means; Error correction means for detecting the upper and lower address information of each divided information in the information recorded on the recording medium and its error correction information, and correcting the error; Upper address information in the preliminary information, upper and lower address information corrected by the error correction means, information indicating whether or not each error correction was possible, and counting by the delimiter information detection number counting means. The upper and lower addresses of each piece of divided information of the information being reproduced based on the number of times of detection of the delimiter information, and the end that detects the end position of the information recorded on the information recording medium based on the determination. An information recording apparatus, comprising: a position detecting means; and additionally recording new information continuously at an end position of information recorded on the information recording medium.