JPS6313171A - Optical disk device - Google Patents

Abstract

PURPOSE:To attain the reduction of a time required for recording operation by recording a digital data including address information and recording the data in an alternative sector if the recovered and extracted address is not coincident with the recorded address. CONSTITUTION:A recording command is given to a host 6 or a CPU 5 to store a digital data into a memory 4 via an interface 7, the CPU 5 adds an address to the memory 4 and a signal added by an error code and a correction code at a circuit 3 is modulated/demodulated by a modulator-demodulator 2 and the result is recorded in a data area of a corresponding address sector of an optical disk 1. The reproduced signal is demodulated by the circuit 2 succeedingly and the error of the data stored in the memory 4 is corrected by the circuit 3. The CPU 5 reads the address from a digital data, compares it with the recorded address, and when they are coincident, the recording is finished, and if dissident, the digital data including the address is recorded in the alternative sector.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an optical disc device that optically records and reproduces predetermined digital information on an optical disc. Data information is also recorded in alternate sectors.

[Conventional technology]

When recording information on a digital optical disc, a track is generally divided into a plurality of sectors, and an address is assigned to each sector. Therefore, each sector consists of an address area and a data area. By the way, although recorded information can be immediately reproduced from an optical disc, once recorded information cannot be updated. If the address cannot be read from the address area, searching becomes impossible, so it has been proposed, for example, in Japanese Patent Laid-Open No. 60-258762, to record address information in the data area as well. In this device, a bad sector mark area is provided between the address area and the data area.
When a defect occurs in data information, a defective sector mark is recorded there, and the data information is recorded in a replacement sector.

Therefore, data information of a sector in which a bad sector mark is detected during reading is read from the alternate sector.

[Problem that the invention seeks to solve]

In this way, conventional devices provide a bad sector mark area between the address area and the data area in each sector, which not only takes time for the recording operation but also reduces the recording capacity of the sector. there were.

[Means for Solving the Problems] The present invention provides a memory for storing digital data information to be recorded, an error detection and correction circuit to which an error detection code and an error correction code are added to detect and correct errors; In an optical disk device equipped with a generation circuit that generates address information and a modulation/demodulation circuit that modulates recorded information, records it on an optical disk, and demodulates reproduced information, when a command is given to record digital data information, the generation circuit inputs data into the memory. Address information is added to the stored digital data information, the error detection and correction circuit adds an error detection code and an error correction code to the digital data information to which the address information has been added, and the modulation and demodulation circuit is processed by the error detection and correction circuit. The recorded digital data information is recorded in the sector corresponding to the address of the optical disk, and after the recording is completed, the recorded information is reproduced from the sector, the address information is read from the reproduced digital data information, and the read address information and the recorded address information are combined. If the two address information do not match, the data information including the address information processed by the error detection and correction circuit is alternately recorded in the sectors.

[Effect]

When recording of digital data is commanded, digital data information including address information is recorded in the data area of that address. The digital data information is reproduced immediately after recording, and if the address information extracted from the digital data information does not match the recorded address information, the digital data information including the address information is recorded again in the alternate sector.

〔Example〕

FIG. 1 is a block diagram of an optical disc device of the present invention.

In the figure, reference numeral 1 denotes an optical disc, on which a signal modulated by a modulation/demodulation circuit 2 is recorded, and a signal reproduced from the disc is demodulated by the modulation/demodulation circuit 2. 3 is an error detection and correction circuit which adds an error detection code and an error correction code to the recorded signal, and also detects and corrects errors in the reproduced signal. 5
is a CPU that controls various circuits, means, etc., and also generates address signals. 4 is a memory such as a RAM, which stores signals to be recorded and reproduced. A host computer 6 transmits and receives signals to be recorded and reproduced on the optical disc 1 via an interface 7.

During recording, the process operates as shown in the flowchart shown in FIG. 2, for example. host computer 6 or C
When a recording command is input to the PU 5, digital data to be recorded is sent from the host computer 6 via the interface 7. This data is in memory 4
is memorized.

At this time, the CPU 5 as an address generation circuit
Add an address to. Further, the error detection and correction circuit 3 adds an error detection code (CRC) and an error correction code (parity) to the data stored in the memory 4. The signals processed by the error detection and correction circuit 3 in this manner are arranged as shown in FIG. 4, for example. In other words, data information (A in the diagram)
, address information (B), and error detection signal (C) are arranged as shown in the figure, and an error correction code (D) is added to all of them as shown in the figure.

The signal processed in this manner is modulated by a predetermined method (for example, MZ) by the modulation/demodulation circuit 2 and recorded in the data area of the sector of the optical disc 1 at the corresponding address. At this time, address information is recorded in advance in that address area.

Immediately after the recording operation is completed, a reproduction operation (verify read) is executed, and data is read from the data area of the sector at the corresponding address. The signal reproduced from the optical disc 1 is demodulated by the modulation/demodulation circuit 2 and stored in the memory 4.

The error detection and correction circuit 3 corrects errors in the digital data stored in the memory 4, and detects any uncorrectable errors.

When there is no error, the CPU 5 reads the address information separated from the digital data information and compares it with the recorded address information. When the address information read from the data area and the recorded address information match, the recording operation is completed.

When an error is detected after correction or when both address information do not match, the signal processed by the error detection and correction circuit 3, that is, the digital data information including the address information (the same digital data recorded in the sector of the corresponding address) data information) is recorded in alternate sectors.

Next, reproduction is performed, for example, as shown in the flowchart of FIG. When a reproduction command is input, the sector at the address specified in the command is searched. At this time, CP
U5 reads the address of the address area, and when the address matches the specified address, stores the data of the data area in the memory 4. Error detection and correction circuit 3
corrects the error in this data, and if there is no error that cannot be corrected, extracts the address information from the data information. Next, compares the extracted address information with the specified address information, and if the two match, then extracts the address information from the data information. The data information is sent to the host computer 6 via the interface 7.

If there is an error that cannot be corrected or if both address information do not match, the data information of the alternate sector is reproduced. The address information is read from the data information of the alternate sector in the same manner as described above, and when it matches the designated address, the data information is sent to the host computer 6.

〔effect〕

As described above, the present invention provides a memory that stores digital data information to be recorded, an error detection and correction circuit that detects and corrects errors by adding an error detection code and an error correction code, and a generation circuit that generates address information. In an optical disk device equipped with a modulation/demodulation circuit that modulates recorded information, records it on an optical disk, and demodulates reproduced information, when a command is given to record digital data information, the generation circuit modulates the digital data information stored in the memory. Address information is added, the error detection and correction circuit adds an error detection code and an error correction code to the digital data information to which the address information has been added, and the modulation/demodulation circuit transfers the digital data information processed by the error detection and correction circuit to the optical disc. The recorded information is recorded in the sector corresponding to the address, and after recording is completed, the recorded information is reproduced from the sector, the address information is read from the reproduced digital data information, the read address information and the recorded address information are compared, and both address information If they do not match, the data information including the address information processed by the error detection and correction circuit is recorded in alternate sectors, so that the process of simply recording in the alternate sector is the same as when recording in a normal sector. This reduces the time required for recording operations.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the optical disc device of the present invention, FIGS. 2 and 3 are flowcharts thereof, and FIG. 4 is an explanatory diagram of its data. 1... Optical disk 2... Modulation/demodulation circuit 3... Error detection/correction circuit 4... Memory 5... CPU 6... Host computer 7... Interface or higher

Claims (1)

[Claims] a memory for storing digital data information to be recorded;
An error detection and correction circuit that adds an error detection code and an error correction code to detect and correct errors, a generation circuit that generates address information, and a modulation/demodulation circuit that modulates recorded information, records it on an optical disk, and demodulates reproduced information. In an optical disk device comprising a circuit, when recording of the digital data information is commanded, the generating circuit adds the address information to the digital data information stored in the memory, and the error detection and correction circuit adds the address information to the digital data information stored in the memory. The error detection code and the error correction code are added to the digital data information to which information has been added, and the modulation/demodulation circuit corresponds the digital data information processed by the error detection and correction circuit to the address of the optical disk. The recorded information is recorded in a sector, and after recording is completed, the recorded information is reproduced from the sector, the address information is read from the reproduced digital data information, and the read address information and the recorded address information are compared. An optical disc device characterized in that, when they do not match, the digital data information including the address information processed by the error detection and correction circuit is recorded in alternate sectors.